Improve D&D validation reliability

assets/dnd/combat-turns/schemas/dnd_combat_turns_llm.v1.json

@@ -16,7 +16,8 @@
             "type": "string"
           },
           "turn_kind": {
-            "type": "string"
+            "type": "string",
+            "enum": ["turn", "reaction", "legendary_action", "lair_action", "other"]
           },
           "source_refs": {
             "type": "array",

assets/dnd/enemy-events/schemas/dnd_enemy_events_llm.v1.json

@@ -13,7 +13,10 @@
         "required": ["name", "kind", "source_refs"],
         "properties": {
           "name": {"type": "string"},
-          "kind": {"type": "string"},
+          "kind": {
+            "type": "string",
+            "enum": ["engaged", "killed", "fled", "captured", "incapacitated"]
+          },
           "source_refs": {
             "type": "array",
             "items": {

assets/dnd/npc-occurrences/schemas/dnd_npc_occurrences_llm.v1.json

@@ -16,7 +16,8 @@
             "type": "string"
           },
           "kind": {
-            "type": "string"
+            "type": "string",
+            "enum": ["mentioned", "noncombat_presence", "dialogue", "combat_ally", "combat_opponent", "other"]
           },
           "source_refs": {
             "type": "array",

assets/dnd/scene-descriptions/schemas/dnd_scene_descriptions_llm.v1.json

@@ -6,7 +6,8 @@
   "required": ["kind", "title", "summary"],
   "properties": {
     "kind": {
-      "type": "string"
+      "type": "string",
+      "enum": ["combat", "narrative", "recap", "meta"]
     },
     "title": {
       "type": "string"

docs/internal/dnd.md

@@ -209,12 +209,30 @@ wrong-direction rejection, execution failure, producer-correction success,
 added calls, latency, and token use together. A structurally successful
 provider run alone is not evidence that the validator should become a default.
 
-Every D&D rejection describes the correction in transcript-grounded domain
-terms, using contextual names, artifact fields, and source segment ranges when
-useful. The guidance must not ask the model to reproduce durable entity IDs,
-hashes, validator module keys, or reason codes. Those identifiers remain in
-ordinary validation provenance; only the actionable semantic guidance is
-eligible for the correction prompt.
+Every producer-correctable D&D rejection describes all currently detectable
+corrections in transcript-grounded domain terms, using contextual names,
+model-owned artifact fields, and source segment ranges when useful. Validators
+collect independent record defects in one pass so one retry does not merely
+reveal the next issue. Shared D&D diagnostic helpers keep repeated rules and
+record descriptions stable, de-duplicated, and bounded; each artifact family
+continues to own the semantic rule and its prose.
+
+Operator diagnostics and model guidance are separate products of the same
+assessment. Operator messages may use typed paths, reason details, and opaque
+application identities. Correction guidance must not copy those messages or
+ask the model to reproduce durable entity IDs, hashes, validator module keys,
+reason codes, or Go field paths. A registry-normalization rejection instead
+speaks in terms of the duplicate-group proposal response the normalizer can
+actually revise. Normalization-only deterministic invariants retain useful
+operator detail but do not imply that a model controls derived ordering or
+identity. Only bounded actionable semantic guidance is eligible for a
+correction prompt.
+
+Private LLM schemas use simple enums for closed categorical fields when the
+provider-compatible shape can express the rule directly. Deterministic typed
+validators retain the same checks as defense in depth and for non-LLM
+producers. Private schemas keep every property required and avoid optional
+properties, `uniqueItems`, and conditional cross-field logic.
 
 Item-occurrence shape validation groups repeated holder mistakes by occurrence
 kind and gives the producer the required JSON null/non-null relationship. It
@@ -228,6 +246,14 @@ the same comparison identity within one scene-scoped result. Normalization may
 combine results from distinct scenes, so it intentionally does not apply that
 rule. Configuration owns the exact validator key and chain position.
 
+Extraction source-reference validators share one full-span chunk-containment
+policy. After ordinary reference validity succeeds, the policy resolves both
+endpoints through document order and requires every source unit in the
+inclusive range to be present in the current chunk. It does not assume numeric
+unit-ID ordering, mutate input, or weaken wrong-source and unresolved-reference
+validation. Scene descriptions remain separate because their validator owns an
+exact one-scene range contract rather than general extraction containment.
+
 Normalizers are deterministic for spells, combat turns, item occurrences, NPC
 occurrences, scene descriptions, enemy events, and location occurrences. They
 canonicalize display values and evidence, use source-document order for stable

docs/roadmap/dnd-validation-reliability.md

@@ -0,0 +1,240 @@
+# D&D Validation Reliability Hardening
+
+## Purpose
+
+Improve the correctness and efficiency of D&D validation retries by giving the
+producer complete, contextual, semantically useful correction guidance; moving
+simple closed-value checks into compatible LLM-facing schemas; and removing
+duplicated source-range containment logic. The work should make one retry more
+likely to repair every detectable defect without weakening deterministic
+validation or exposing internal identifiers to a model.
+
+## Current State And Findings
+
+The validation architecture is coherent and the major safety boundaries are in
+place. Validators run through the framework-managed retry protocol, model-facing
+guidance is distinct from reason codes and operator diagnostics, schemas use
+provider-compatible required fields, and D&D extraction adapters canonically
+order safely resolvable source-reference endpoints before validation. The
+review nevertheless found four opportunities to make that architecture more
+consistent and effective.
+
+### Generic correction guidance
+
+Most rejecting D&D validators produce detailed operator-facing messages but
+pair them with a fixed, general correction sentence. The framework correctly
+constructs retry text from `CorrectionGuidance` alone, so the model does not see
+the internal diagnostic—and therefore often does not learn which records were
+wrong or how each record must change. Item-occurrence shape validation and the
+combat-semantics validator already demonstrate the intended contextual pattern.
+
+Passing the operator message through unchanged is not an acceptable fix.
+Operator messages may contain Go paths, array indexes that do not reliably map
+back to canonicalized model output, reason codes, validator terminology, or
+opaque application identities. Those details are useful for diagnosis but are
+not appropriate model context.
+
+### Missing closed-value schema constraints
+
+Four private LLM response schemas describe categorical fields as unconstrained
+strings even though their prompts, durable artifact schemas, and deterministic
+validators define closed value sets:
+
+- `combat-turns`: `turn_kind`;
+- `enemy-events`: `kind`;
+- `npc-occurrences`: `kind`; and
+- `scene-descriptions`: `kind`.
+
+This defers an inexpensive structural check until the outer semantic-validation
+loop. Item and location occurrences already use the preferable private-schema
+enum pattern.
+
+### First-defect validation
+
+Spell shape validation returns after the first invalid cast field, and enemy
+engagement validation returns after the first duplicated engagement subject.
+When multiple defects exist, each retry can therefore reveal only one of them.
+That needlessly consumes the bounded producer-attempt budget and makes
+correction less reliable for smaller models.
+
+### Duplicated source-range containment
+
+Nine extraction source-reference validators independently determine whether a
+citation belongs to the current chunk. Five validate every source unit spanned
+by a reference, while four check only the endpoints. Those behaviors are
+equivalent for today's contiguous materialized chunks, but the duplicated
+implementations and different apparent contracts create a drift risk.
+Scene-description validation has a separate exact-one-scene range contract and
+should remain specialized.
+
+## Target End State
+
+- Every producer-correctable D&D rejection supplies bounded contextual guidance
+  that identifies all affected records using transcript-grounded names, source
+  ranges, and response fields as appropriate, explains each semantic defect,
+  and requests one complete corrected replacement.
+- Model-facing guidance never contains reason codes, validator keys, Go field
+  paths, opaque or hash-derived entity IDs, or raw internal error text.
+  Operator diagnostics remain detailed and separately available.
+- Every detectable issue in a candidate is collected in one validator pass,
+  subject to the repository's established diagnostic bounds. A retry is not
+  spent merely to reveal the next defect.
+- Closed categorical fields are constrained by compatible enums in the private
+  LLM schemas. Deterministic typed validators retain the same rules as
+  defense-in-depth and as protection for non-LLM producers and later stages.
+- One D&D-owned helper implements full-span chunk containment for extraction
+  evidence. All applicable source-reference validators use it and no
+  module-local endpoint-only or coverage implementation remains.
+- Validator results remain immutable, deterministic, bounded, and suitable for
+  the existing feedback-aware replacement-request protocol. Retry budgets,
+  warning policy, durable artifact schemas, and accepted output semantics do
+  not change.
+
+## Required Work
+
+### Contextual correction guidance
+
+Audit each rejecting D&D validator according to the stage that can actually
+correct its result:
+
+- Extraction validators should build model-facing issue descriptions from the
+  candidate and its transcript context. Shape, registry-membership, identity,
+  catalog, engagement, and source-reference validators should name the
+  contextual artifact and cited range where useful, state the invalid value or
+  relationship in plain language, and state the required replacement shape.
+- LLM-backed NPC, item, and location registry reconciliation should continue to
+  translate its typed proposal issues through the shared category-to-prose
+  renderer, including any domain-specific supplement.
+- Normalization-only deterministic invariant validators should retain useful
+  operator diagnostics. They should not claim that a producer can directly
+  repair deterministically derived ordering, identity, or normalization state.
+  If such a rejection can reach a feedback-capable producer, guidance must be
+  expressed only in terms of the source candidate that producer controls.
+- LLM-backed semantic validators may continue using their verdict explanation
+  when it is bounded and semantically meaningful.
+
+Introduce a small D&D-shared diagnostic utility only for demonstrated common
+mechanics such as stable grouping, de-duplication, contextual source-range
+rendering, and bounded correction aggregation. Domain validators must continue
+to own the meaning and prose of their rules. The generic pipeline must not gain
+D&D knowledge, and operator `Message` values must never be mechanically copied
+into `CorrectionGuidance`.
+
+Update validator policy fingerprints wherever correction behavior changes so
+checkpoints created under generic feedback are not reused as though the policy
+were identical.
+
+### Private-schema enum guardrails
+
+Add the existing supported value sets to the four private LLM schemas:
+
+- `assets/dnd/combat-turns/schemas/dnd_combat_turns_llm.v1.json`;
+- `assets/dnd/enemy-events/schemas/dnd_enemy_events_llm.v1.json`;
+- `assets/dnd/npc-occurrences/schemas/dnd_npc_occurrences_llm.v1.json`; and
+- `assets/dnd/scene-descriptions/schemas/dnd_scene_descriptions_llm.v1.json`.
+
+Use the exact values owned by the corresponding durable contract and typed
+domain constants. Keep all object properties required, retain current nullable
+types where present, and do not introduce `uniqueItems`, optional properties,
+or conditional schema logic. Revise schema tests that currently accept unknown
+values, and rely on computed asset fingerprints to invalidate incompatible
+LLM-output checkpoints. Keep deterministic enum validation in place.
+
+### Complete per-attempt issue collection
+
+Refactor spell shape and enemy engagement validation to inspect the complete
+candidate and collect every detectable violation before returning. Build the
+operator diagnostic and contextual correction request from the same evaluated
+issue set while preserving their different audiences. De-duplicate repeated
+semantic instructions, retain enough contextual identification for every
+affected record, and use the established bounded diagnostic behavior rather
+than an unbounded error string.
+
+Review the surrounding D&D validators while applying the contextual-guidance
+change. Remove any additional accidental early exits that prevent independent
+candidate defects from being reported together, but retain immediate returns
+for request-level prerequisites whose absence makes further inspection unsafe
+or meaningless.
+
+### Shared full-span chunk containment
+
+Add one helper under `internal/modules/dnd/shared` that determines whether a
+source reference's complete document-ordered span is contained by a chunk. The
+helper must:
+
+- validate source identity;
+- resolve endpoints through `source.DocumentIndex` rather than numeric-ID
+  assumptions;
+- require every unit in the inclusive span to be present in the chunk;
+- handle nil or unresolved inputs without panic;
+- avoid mutating the source, chunk, or reference; and
+- leave source-reference validity and error wording to the consuming validator.
+
+Use the helper from the spell, NPC-registry, NPC-occurrence, item-registry,
+item-occurrence, location-registry, location-occurrence, combat-turn, and
+enemy-event source-reference validators. Keep the scene-description exact-range
+validator separate because it enforces a materially different contract.
+
+## Testing And Documentation
+
+Add lean offline behavioral coverage at the narrowest stable boundary:
+
+- correction tests should prove that multiple contextual defects produce one
+  actionable, bounded request and that internal identifiers and diagnostic
+  syntax are absent; they should not snapshot exact prose or message length;
+- schema tests should prove rejection of representative unsupported categorical
+  values and acceptance of the supported sets without duplicating every
+  provider behavior;
+- spell-shape and engagement tests should prove that independent defects are
+  reported together;
+- the shared containment helper should own the full case matrix, including
+  partial spans, non-monotonic unit IDs, wrong sources, unresolved endpoints,
+  and nil inputs; consuming validators need only enough coverage to prove they
+  use the common policy; and
+- existing validator tests should be simplified when the shared helper makes
+  module-local cases redundant.
+
+Update `docs/internal/dnd.md` to document the durable conventions for
+contextual correction guidance, complete issue collection, private-schema enum
+guardrails, and shared full-span extraction containment. Update
+`docs/internal/pipeline.md` only if framework behavior changes; the intended
+work applies its existing contract and should normally require only a link or
+no change. No new ADR is required because ADR-0014 and the architecture policy
+already decide the separation between semantic guidance and internal
+diagnostics. Create an ADR only if implementation requires changing that
+framework-level decision.
+
+## Non-Goals
+
+- Passing operator diagnostics or internal errors directly to an LLM.
+- Exposing durable IDs, hashes, reason codes, validator keys, or raw provider
+  responses in correction text.
+- Changing stage retry counts, PromptKit structural-repair budgets, validator
+  failure policy, or warning classification.
+- Silently repairing domain-semantic defects or weakening deterministic
+  validators after adding schema guardrails.
+- Adding provider-sensitive schema constructs beyond simple enums.
+- Moving D&D-specific behavior into the generic pipeline framework.
+- Generalizing the scene-description exact-range contract into the shared
+  extraction containment helper.
+
+## Acceptance Criteria
+
+- Every producer-correctable D&D rejection reviewed in this work gives the next
+  attempt all currently detectable, actionable corrections in contextual prose.
+- No model-facing correction request contains an opaque entity ID, hash,
+  validator key, reason code, Go-style field path, or unfiltered operator error.
+- Spell shape and enemy engagement validation aggregate independent defects in
+  one pass and keep outputs immutable.
+- The four private LLM schemas reject unsupported categorical values, retain
+  provider-compatible required-only shapes, and leave durable v1 contracts
+  unchanged.
+- All nine applicable extraction source-reference validators use one D&D-shared
+  full-span containment policy; scene descriptions retain their specialized
+  exact-range check.
+- Validator and asset fingerprints change wherever their effective policy
+  changes, preventing reuse of stale checkpoints.
+- Canonical internal documentation records the conventions future D&D
+  validators must follow.
+- Focused tests, `go test ./...`, `go vet ./...`, and
+  `go build ./cmd/notarius` pass in a supported development environment.

internal/modules/dnd/extract/combatturns/extractor_test.go

@@ -66,7 +66,7 @@ func TestExtractMapsAndOrdersCombatTurnsBySourcePosition(t *testing.T) {
 func TestExtractPreservesInvalidCandidatesForValidators(t *testing.T) {
 	client := &fakeCombatTurnsLLMClient{response: extractionResponse{CombatTurns: []combatTurnResponse{
 		{
-			Actor: " ", TurnKind: "unsupported",
+			Actor: " ", TurnKind: "turn",
 			SourceRefs: []combatSourceRefResponse{{StartUnitID: 99, EndUnitID: 0}},
 		},
 	}}}
@@ -75,7 +75,7 @@ func TestExtractPreservesInvalidCandidatesForValidators(t *testing.T) {
 		t.Fatalf("Extract() error = %v, want nil for candidate values", err)
 	}
 	turn := result.Value.CombatTurns[0]
-	if turn.Actor != " " || turn.TurnKind != "unsupported" {
+	if turn.Actor != " " || turn.TurnKind != "turn" {
 		t.Fatalf("invalid turn fields = %#v, want preserved candidate values", turn)
 	}
 	if turn.SourceRefs[0] != (source.SourceRef{SourceID: "session-alpha", StartUnitID: 99}) {

internal/modules/dnd/extract/combatturns/schema_test.go

@@ -7,6 +7,8 @@ import (
 	"testing"
 
 	"github.com/santhosh-tekuri/jsonschema/v6"
+
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
 )
 
 func TestLoadResponseSchemaUsesPrivateCombatShape(t *testing.T) {
@@ -37,7 +39,7 @@ func TestLoadResponseSchemaUsesPrivateCombatShape(t *testing.T) {
 	}
 }
 
-func TestResponseSchemaLeavesSemanticConstraintsToDeterministicValidators(t *testing.T) {
+func TestResponseSchemaLeavesNonCategoricalSemanticsToDeterministicValidators(t *testing.T) {
 	schema, err := loadResponseSchema()
 	if err != nil {
 		t.Fatal(err)
@@ -45,7 +47,6 @@ func TestResponseSchemaLeavesSemanticConstraintsToDeterministicValidators(t *tes
 	semanticCandidate := validCombatResponse()
 	turn := semanticCandidate["combat_turns"].([]any)[0].(map[string]any)
 	turn["actor"] = ""
-	turn["turn_kind"] = "unsupported"
 	ref := turn["source_refs"].([]any)[0].(map[string]any)
 	ref["start_unit_id"] = 0
 	ref["end_unit_id"] = -1
@@ -54,7 +55,7 @@ func TestResponseSchemaLeavesSemanticConstraintsToDeterministicValidators(t *tes
 		t.Fatal(err)
 	}
 	if err := validateJSONSchema(content, schema.JSONSchema); err != nil {
-		t.Fatalf("private schema rejected validator-owned semantics: %v", err)
+		t.Fatalf("private schema rejected non-categorical validator-owned semantics: %v", err)
 	}
 	turn["source_refs"] = []any{}
 	content, err = json.Marshal(semanticCandidate)
@@ -79,6 +80,7 @@ func TestResponseSchemaRetainsStructuralBoundary(t *testing.T) {
 		{name: "wrong actor type", mutate: func(turn map[string]any) { turn["actor"] = 1 }},
 		{name: "unknown field", mutate: func(turn map[string]any) { turn["unexpected"] = true }},
 		{name: "missing source refs", mutate: func(turn map[string]any) { delete(turn, "source_refs") }},
+		{name: "unsupported turn kind", mutate: func(turn map[string]any) { turn["turn_kind"] = "unsupported" }},
 	} {
 		t.Run(test.name, func(t *testing.T) {
 			candidate := validCombatResponse()
@@ -94,6 +96,24 @@ func TestResponseSchemaRetainsStructuralBoundary(t *testing.T) {
 	}
 }
 
+func TestResponseSchemaAcceptsEverySupportedTurnKind(t *testing.T) {
+	schema, err := loadResponseSchema()
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, kind := range []string{string(dnd.CombatTurnKindTurn), string(dnd.CombatTurnKindReaction), string(dnd.CombatTurnKindLegendaryAction), string(dnd.CombatTurnKindLairAction), string(dnd.CombatTurnKindOther)} {
+		candidate := validCombatResponse()
+		candidate["combat_turns"].([]any)[0].(map[string]any)["turn_kind"] = kind
+		content, err := json.Marshal(candidate)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if err := validateJSONSchema(content, schema.JSONSchema); err != nil {
+			t.Fatalf("supported turn kind %q was rejected: %v", kind, err)
+		}
+	}
+}
+
 func TestResponseSchemaJSONIsMutationSafe(t *testing.T) {
 	first, err := loadResponseSchema()
 	if err != nil {

internal/modules/dnd/extract/enemyevents/extractor_test.go

@@ -59,14 +59,14 @@ func TestExtractMapsEnemyEventsInSourceOrder(t *testing.T) {
 
 func TestExtractPreservesSemanticCandidatesAndResponseOwnership(t *testing.T) {
 	client := &fakeEnemyEventsLLMClient{response: extractionResponse{Events: []enemyEventResponse{{
-		Name: " ", Kind: "unsupported", SourceRefs: []enemySourceRefResponse{{StartUnitID: 99, EndUnitID: 0}},
+		Name: " ", Kind: "engaged", SourceRefs: []enemySourceRefResponse{{StartUnitID: 99, EndUnitID: 0}},
 	}}}}
 	result, err := newEnemyExtractor(t, client).Extract(context.Background(), enemyExtractionRequest(t))
 	if err != nil {
 		t.Fatal(err)
 	}
 	event := result.Value.Events[0]
-	if event.Name != " " || event.Kind != "unsupported" || event.SourceRefs[0] != (source.SourceRef{SourceID: "combat-session", StartUnitID: 99}) {
+	if event.Name != " " || event.Kind != "engaged" || event.SourceRefs[0] != (source.SourceRef{SourceID: "combat-session", StartUnitID: 99}) {
 		t.Fatalf("semantic candidate = %#v", event)
 	}
 	result.Value.Events[0].SourceRefs[0].StartUnitID = 7

internal/modules/dnd/extract/enemyevents/schema_test.go

@@ -7,6 +7,8 @@ import (
 	"testing"
 
 	"github.com/santhosh-tekuri/jsonschema/v6"
+
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
 )
 
 func TestResponseSchemaDefinesPrivateStructuralBoundary(t *testing.T) {
@@ -28,13 +30,12 @@ func TestResponseSchemaDefinesPrivateStructuralBoundary(t *testing.T) {
 	semantic := validEnemyResponse()
 	event := semantic["events"].([]any)[0].(map[string]any)
 	event["name"] = ""
-	event["kind"] = "unsupported"
 	ref := event["source_refs"].([]any)[0].(map[string]any)
 	ref["start_unit_id"] = 0
 	ref["end_unit_id"] = -1
 	content, err = json.Marshal(semantic)
 	if err != nil || validateEnemySchema(content, schema.JSONSchema) != nil {
-		t.Fatalf("validator-owned semantics were rejected: %v", err)
+		t.Fatalf("non-categorical validator-owned semantics were rejected: %v", err)
 	}
 }
 
@@ -46,6 +47,7 @@ func TestResponseSchemaRejectsInvalidStructure(t *testing.T) {
 	for _, mutate := range []func(map[string]any){
 		func(event map[string]any) { delete(event, "name") },
 		func(event map[string]any) { event["kind"] = 1 },
+		func(event map[string]any) { event["kind"] = "unsupported" },
 		func(event map[string]any) { event["unexpected"] = true },
 		func(event map[string]any) { event["source_refs"].([]any)[0].(map[string]any)["source_id"] = "session" },
 	} {
@@ -70,6 +72,24 @@ func TestResponseSchemaRejectsInvalidStructure(t *testing.T) {
 	}
 }
 
+func TestResponseSchemaAcceptsEverySupportedKind(t *testing.T) {
+	schema, err := loadResponseSchema()
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, kind := range []string{string(dnd.EnemyEventKindEngaged), string(dnd.EnemyEventKindKilled), string(dnd.EnemyEventKindFled), string(dnd.EnemyEventKindCaptured), string(dnd.EnemyEventKindIncapacitated)} {
+		candidate := validEnemyResponse()
+		candidate["events"].([]any)[0].(map[string]any)["kind"] = kind
+		content, err := json.Marshal(candidate)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if err := validateEnemySchema(content, schema.JSONSchema); err != nil {
+			t.Fatalf("supported enemy-event kind %q was rejected: %v", kind, err)
+		}
+	}
+}
+
 func validEnemyResponse() map[string]any {
 	return map[string]any{"events": []any{map[string]any{
 		"name": "Ashfang", "kind": "engaged", "source_refs": []any{map[string]any{"start_unit_id": 1, "end_unit_id": 1}},

internal/modules/dnd/extract/npcoccurrences/extractor_test.go

@@ -24,7 +24,7 @@ func TestExtractMapsEveryKindAndOrdersBySourcePosition(t *testing.T) {
 		{Name: "Speaker", Kind: "dialogue", SourceRefs: append(occurrenceRefs(2, 2), occurrenceRefs(2, 2)...)},
 		{Name: "Present", Kind: "noncombat_presence", SourceRefs: occurrenceRefs(7, 2)},
 		{Name: "Mentioned", Kind: "mentioned", SourceRefs: occurrenceRefs(10, 10)},
-		{Name: "Invalid", Kind: "unsupported", SourceRefs: occurrenceRefs(0, 0)},
+		{Name: "Invalid", Kind: "other", SourceRefs: occurrenceRefs(0, 0)},
 	}}}
 	references := requiredRegistryReferences(t, "Mentioned", "Speaker", "Present", "Ally", "Opponent", "Other", "Invalid")
 	req := extractionRequest()
@@ -44,7 +44,7 @@ func TestExtractMapsEveryKindAndOrdersBySourcePosition(t *testing.T) {
 		dnd.NPCOccurrenceKindCombatAlly,
 		dnd.NPCOccurrenceKindCombatOpponent,
 		dnd.NPCOccurrenceKindOther,
-		"unsupported",
+		dnd.NPCOccurrenceKindOther,
 	}) {
 		t.Fatalf("occurrence kinds = %#v", got)
 	}
@@ -57,7 +57,7 @@ func TestExtractMapsEveryKindAndOrdersBySourcePosition(t *testing.T) {
 	if id := result.Value.Occurrences[0].NPCID; id != identity.DeriveID("Mentioned") {
 		t.Fatalf("durable NPC ID = %q, want registry identity", id)
 	}
-	if invalid := result.Value.Occurrences[6]; invalid.Name != "Invalid" || invalid.Kind != "unsupported" || !reflect.DeepEqual(invalid.SourceRefs, []source.SourceRef{{SourceID: "session-alpha"}}) {
+	if invalid := result.Value.Occurrences[6]; invalid.Name != "Invalid" || invalid.Kind != dnd.NPCOccurrenceKindOther || !reflect.DeepEqual(invalid.SourceRefs, []source.SourceRef{{SourceID: "session-alpha"}}) {
 		t.Fatalf("invalid candidate = %#v, want preserved values with current source identity", invalid)
 	}
 	if len(client.requests) != 1 {

internal/modules/dnd/extract/npcoccurrences/schema_test.go

@@ -7,6 +7,8 @@ import (
 	"testing"
 
 	"github.com/santhosh-tekuri/jsonschema/v6"
+
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
 )
 
 func TestResponseSchemaOwnsOnlyPrivateStructuralContract(t *testing.T) {
@@ -29,7 +31,6 @@ func TestResponseSchemaOwnsOnlyPrivateStructuralContract(t *testing.T) {
 	semanticCandidate := validOccurrenceResponse()
 	occurrence := semanticCandidate["occurrences"].([]any)[0].(map[string]any)
 	occurrence["name"] = ""
-	occurrence["kind"] = "unsupported"
 	ref := occurrence["source_refs"].([]any)[0].(map[string]any)
 	ref["start_unit_id"] = 0
 	ref["end_unit_id"] = -1
@@ -38,12 +39,13 @@ func TestResponseSchemaOwnsOnlyPrivateStructuralContract(t *testing.T) {
 		t.Fatal(err)
 	}
 	if err := validateJSONSchema(content, schema.JSONSchema); err != nil {
-		t.Fatalf("schema rejected validator-owned semantics: %v", err)
+		t.Fatalf("schema rejected non-categorical validator-owned semantics: %v", err)
 	}
 
 	for _, mutate := range []func(map[string]any){
 		func(record map[string]any) { delete(record, "name") },
 		func(record map[string]any) { record["kind"] = 1 },
+		func(record map[string]any) { record["kind"] = "unsupported" },
 		func(record map[string]any) { record["npc_id"] = "npc:sha256:opaque" },
 		func(record map[string]any) { record["unexpected"] = true },
 		func(record map[string]any) {
@@ -79,6 +81,24 @@ func TestResponseSchemaIsDefensiveAndContentSafe(t *testing.T) {
 	}
 }
 
+func TestResponseSchemaAcceptsEverySupportedKind(t *testing.T) {
+	schema, err := loadResponseSchema()
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, kind := range []string{string(dnd.NPCOccurrenceKindMentioned), string(dnd.NPCOccurrenceKindNoncombatPresence), string(dnd.NPCOccurrenceKindDialogue), string(dnd.NPCOccurrenceKindCombatAlly), string(dnd.NPCOccurrenceKindCombatOpponent), string(dnd.NPCOccurrenceKindOther)} {
+		candidate := validOccurrenceResponse()
+		candidate["occurrences"].([]any)[0].(map[string]any)["kind"] = kind
+		content, err := json.Marshal(candidate)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if err := validateJSONSchema(content, schema.JSONSchema); err != nil {
+			t.Fatalf("supported NPC-occurrence kind %q was rejected: %v", kind, err)
+		}
+	}
+}
+
 func validOccurrenceResponse() map[string]any {
 	return map[string]any{"occurrences": []any{map[string]any{
 		"name": "Mira Thorn", "kind": "dialogue",

internal/modules/dnd/extract/scenedescriptions/extractor_test.go

@@ -75,18 +75,18 @@ func TestExtractReturnsSemanticallyInvalidResponseForDeterministicValidation(t *
 	if err != nil {
 		t.Fatalf("loadResponseSchema() error = %v", err)
 	}
-	if err := validateJSONSchema(t, map[string]any{"kind": "unrecognized", "title": " ", "summary": ""}, schema.JSONSchema); err != nil {
+	if err := validateJSONSchema(t, map[string]any{"kind": "narrative", "title": " ", "summary": ""}, schema.JSONSchema); err != nil {
 		t.Fatalf("semantic candidate rejected by private schema: %v", err)
 	}
 	client := &fakeSceneDescriptionsLLMClient{response: extractionResponse{
-		Kind: dnd.SceneKind("unrecognized"), Title: " ", Summary: "",
+		Kind: dnd.SceneKindNarrative, Title: " ", Summary: "",
 	}}
 	result, err := newExtractor(t, client).Extract(context.Background(), extractionRequest())
 	if err != nil {
 		t.Fatalf("Extract() error = %v, want nil", err)
 	}
 	scene := result.Value.Scenes[0]
-	if scene.Kind != dnd.SceneKind("unrecognized") || scene.Title != "" || scene.Summary != "" {
+	if scene.Kind != dnd.SceneKindNarrative || scene.Title != "" || scene.Summary != "" {
 		t.Fatalf("scene = %#v, want semantic candidates returned for deterministic validation", scene)
 	}
 }

internal/modules/dnd/extract/scenedescriptions/schema_test.go

@@ -7,6 +7,8 @@ import (
 	"testing"
 
 	"github.com/santhosh-tekuri/jsonschema/v6"
+
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
 )
 
 func TestLoadResponseSchemaUsesStrictPrivateSceneDescriptionContract(t *testing.T) {
@@ -30,7 +32,7 @@ func TestLoadResponseSchemaUsesStrictPrivateSceneDescriptionContract(t *testing.
 		{name: "unknown framework field", response: map[string]any{"kind": "combat", "title": "Ambush", "summary": "Bandits strike.", "id": "assigned-later"}},
 		{name: "unknown application field", response: map[string]any{"kind": "combat", "title": "Ambush", "summary": "Bandits strike.", "source_ref": map[string]any{}}},
 		{name: "collection is not allowed", response: map[string]any{"kind": "combat", "title": "Ambush", "summary": "Bandits strike.", "scenes": []any{}}},
-		{name: "unsupported kind", response: map[string]any{"kind": "interlude", "title": "Ambush", "summary": "Bandits strike."}, valid: true},
+		{name: "unsupported kind", response: map[string]any{"kind": "interlude", "title": "Ambush", "summary": "Bandits strike."}},
 		{name: "empty title", response: map[string]any{"kind": "combat", "title": "", "summary": "Bandits strike."}, valid: true},
 		{name: "empty summary", response: map[string]any{"kind": "combat", "title": "Ambush", "summary": ""}, valid: true},
 		{name: "wrong kind type", response: map[string]any{"kind": 7, "title": "Ambush", "summary": "Bandits strike."}},
@@ -64,6 +66,19 @@ func TestResponseSchemaIsMutationSafeAndDiagnosticsRedactContent(t *testing.T) {
 	}
 }
 
+func TestResponseSchemaAcceptsEverySupportedKind(t *testing.T) {
+	schema, err := loadResponseSchema()
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, kind := range []string{string(dnd.SceneKindCombat), string(dnd.SceneKindNarrative), string(dnd.SceneKindRecap), string(dnd.SceneKindMeta)} {
+		response := map[string]any{"kind": kind, "title": "Title", "summary": "Summary"}
+		if err := validateJSONSchema(t, response, schema.JSONSchema); err != nil {
+			t.Fatalf("supported scene kind %q was rejected: %v", kind, err)
+		}
+	}
+}
+
 func validateJSONSchema(t *testing.T, instance map[string]any, schemaContent []byte) error {
 	t.Helper()
 	content, err := json.Marshal(instance)

internal/modules/dnd/shared/diagnostics/diagnostics.go

@@ -7,6 +7,7 @@ import (
 	"strconv"
 	"strings"
 
+	"gitea.maximumdirect.net/eric/notarius/internal/core/source"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
 	frameworkdiagnostics "gitea.maximumdirect.net/eric/notarius/internal/framework/diagnostics"
 )
@@ -25,6 +26,79 @@ type Finding struct {
 	Message    string
 }
 
+// Corrections collects domain-owned model instructions and contextual record
+// descriptions without coupling them to operator-facing diagnostics. Rules are
+// emitted before affected records so the bounded result remains useful even
+// when a large candidate exceeds the display budget.
+type Corrections struct {
+	groups  []correctionGroup
+	indexes map[string]int
+}
+
+type correctionGroup struct {
+	rule        string
+	records     []string
+	recordsSeen map[string]struct{}
+}
+
+// Add records one semantic rule and, when non-empty, one contextual record to
+// which it applies. key is local grouping state and is never rendered.
+func (c *Corrections) Add(key, rule, record string) {
+	if c.indexes == nil {
+		c.indexes = make(map[string]int)
+	}
+	index, ok := c.indexes[key]
+	if !ok {
+		index = len(c.groups)
+		c.indexes[key] = index
+		c.groups = append(c.groups, correctionGroup{rule: rule, recordsSeen: make(map[string]struct{})})
+	}
+	if record == "" {
+		return
+	}
+	group := &c.groups[index]
+	if _, seen := group.recordsSeen[record]; seen {
+		return
+	}
+	group.recordsSeen[record] = struct{}{}
+	group.records = append(group.records, record)
+}
+
+// Guidance returns one bounded correction request. It deliberately renders
+// neither grouping keys nor operator diagnostics.
+func (c Corrections) Guidance(prefix string) string {
+	issues := make([]string, 0, len(c.groups)*2)
+	for _, group := range c.groups {
+		issues = append(issues, group.rule)
+	}
+	for _, group := range c.groups {
+		issues = append(issues, group.records...)
+	}
+	return Aggregate(prefix, issues)
+}
+
+// SourceRange describes cited transcript positions without exposing source
+// identities or application entity IDs.
+func SourceRange(refs []source.SourceRef) string {
+	if len(refs) == 0 {
+		return "without a cited source range"
+	}
+	description := SourceRefRange(refs[0])
+	if len(refs) > 1 {
+		description += fmt.Sprintf(" (first of %d cited ranges)", len(refs))
+	}
+	return description
+}
+
+// SourceRefRange describes one transcript range without exposing its source
+// identity.
+func SourceRefRange(ref source.SourceRef) string {
+	if ref.StartUnitID == ref.EndUnitID {
+		return "at source unit " + strconv.Itoa(ref.StartUnitID)
+	}
+	return fmt.Sprintf("at source units %d-%d", ref.StartUnitID, ref.EndUnitID)
+}
+
 // DataQualityResult converts accepted source-quality findings into bounded,
 // locally grouped advisories. These findings do not indicate process
 // degradation.

internal/modules/dnd/shared/diagnostics/diagnostics_test.go

@@ -6,9 +6,40 @@ import (
 	"testing"
 	"unicode/utf8"
 
+	"gitea.maximumdirect.net/eric/notarius/internal/core/source"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
 )
 
+func TestCorrectionsGroupRulesBeforeContextAndHideKeys(t *testing.T) {
+	var corrections Corrections
+	corrections.Add("internal-kind", "Use a supported kind.", "Affected goblin at source unit 4.")
+	corrections.Add("internal-kind", "Use a supported kind.", "Affected ogre at source units 8-9.")
+	corrections.Add("internal-kind", "Use a supported kind.", "Affected goblin at source unit 4.")
+	corrections.Add("name", "Provide a contextual name.", "Affected unnamed record at source unit 12.")
+
+	guidance := corrections.Guidance("Correct every record")
+	if strings.Contains(guidance, "internal-kind") {
+		t.Fatalf("Guidance() exposed grouping key: %q", guidance)
+	}
+	if strings.Count(guidance, "Use a supported kind.") != 1 || strings.Count(guidance, "Affected goblin") != 1 {
+		t.Fatalf("Guidance() did not de-duplicate rules and records: %q", guidance)
+	}
+	if strings.Index(guidance, "Use a supported kind.") > strings.Index(guidance, "Affected goblin") {
+		t.Fatalf("Guidance() = %q, want rules before records", guidance)
+	}
+}
+
+func TestSourceRangeUsesOnlyTranscriptPositions(t *testing.T) {
+	refs := []source.SourceRef{
+		{SourceID: "opaque-source", StartUnitID: 8, EndUnitID: 10},
+		{SourceID: "opaque-source", StartUnitID: 12, EndUnitID: 12},
+	}
+	got := SourceRange(refs)
+	if strings.Contains(got, "opaque-source") || !strings.Contains(got, "8-10") || !strings.Contains(got, "first of 2") {
+		t.Fatalf("SourceRange() = %q", got)
+	}
+}
+
 func TestAggregateEnforcesByteBudgetAndReportsOmissions(t *testing.T) {
 	issues := make([]string, MaxIssues)
 	for index := range issues {

internal/modules/dnd/shared/source_ref_coverage.go

@@ -0,0 +1,48 @@
+package shared
+
+import "gitea.maximumdirect.net/eric/notarius/internal/core/source"
+
+// ChunkCoverage is an immutable snapshot of the source units materialized in
+// one extraction chunk.
+type ChunkCoverage struct {
+	sourceID string
+	unitIDs  map[int]struct{}
+}
+
+// NewChunkCoverage snapshots chunk without retaining or mutating it.
+func NewChunkCoverage(chunk *source.Chunk) ChunkCoverage {
+	if chunk == nil {
+		return ChunkCoverage{}
+	}
+	coverage := ChunkCoverage{
+		sourceID: chunk.SourceID,
+		unitIDs:  make(map[int]struct{}, len(chunk.Units)),
+	}
+	for _, unit := range chunk.Units {
+		coverage.unitIDs[unit.ID] = struct{}{}
+	}
+	return coverage
+}
+
+// Contains reports whether ref identifies a valid inclusive span in index and
+// every unit in that document-ordered span is present in the chunk snapshot.
+func (c ChunkCoverage) Contains(index source.DocumentIndex, doc *source.SourceDocument, ref source.SourceRef) bool {
+	documentID, ok := index.DocumentID()
+	if !ok || doc == nil || doc.ID != documentID || c.sourceID == "" || ref.SourceID != c.sourceID || ref.SourceID != documentID {
+		return false
+	}
+	start, startOK := index.Position(ref.StartUnitID)
+	end, endOK := index.Position(ref.EndUnitID)
+	if !startOK || !endOK || start > end {
+		return false
+	}
+	for position := start; position <= end; position++ {
+		if position >= len(doc.Units) {
+			return false
+		}
+		if _, found := c.unitIDs[doc.Units[position].ID]; !found {
+			return false
+		}
+	}
+	return true
+}

internal/modules/dnd/shared/source_ref_coverage_test.go

@@ -0,0 +1,69 @@
+package shared
+
+import (
+	"testing"
+
+	"gitea.maximumdirect.net/eric/notarius/internal/core/source"
+)
+
+func TestChunkCoverageRequiresCompleteDocumentOrderedSpan(t *testing.T) {
+	doc := coverageDocument(30, 10, 20, 40)
+	index := source.NewDocumentIndex(doc)
+
+	for _, test := range []struct {
+		name  string
+		chunk *source.Chunk
+		ref   source.SourceRef
+		want  bool
+	}{
+		{name: "complete non-monotonic span", chunk: coverageChunk(doc.ID, 30, 10, 20), ref: coverageRef(doc.ID, 30, 20), want: true},
+		{name: "single unit", chunk: coverageChunk(doc.ID, 10), ref: coverageRef(doc.ID, 10, 10), want: true},
+		{name: "missing middle unit", chunk: coverageChunk(doc.ID, 30, 20), ref: coverageRef(doc.ID, 30, 20)},
+		{name: "only endpoints", chunk: coverageChunk(doc.ID, 30, 40), ref: coverageRef(doc.ID, 30, 40)},
+		{name: "reversed", chunk: coverageChunk(doc.ID, 30, 10), ref: coverageRef(doc.ID, 10, 30)},
+		{name: "wrong source", chunk: coverageChunk(doc.ID, 30), ref: coverageRef("other", 30, 30)},
+		{name: "missing endpoint", chunk: coverageChunk(doc.ID, 30), ref: coverageRef(doc.ID, 30, 999)},
+		{name: "nil chunk", ref: coverageRef(doc.ID, 30, 30)},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			coverage := NewChunkCoverage(test.chunk)
+			if got := coverage.Contains(index, doc, test.ref); got != test.want {
+				t.Fatalf("Contains() = %t, want %t", got, test.want)
+			}
+		})
+	}
+	if NewChunkCoverage(coverageChunk(doc.ID, 30)).Contains(source.DocumentIndex{}, nil, coverageRef(doc.ID, 30, 30)) {
+		t.Fatal("Contains() with nil document and zero index = true, want false")
+	}
+}
+
+func TestChunkCoverageDoesNotRetainMutableChunkState(t *testing.T) {
+	doc := coverageDocument(1, 2)
+	chunk := coverageChunk(doc.ID, 1, 2)
+	coverage := NewChunkCoverage(chunk)
+	chunk.SourceID = "changed"
+	chunk.Units[0].ID = 99
+	if !coverage.Contains(source.NewDocumentIndex(doc), doc, coverageRef(doc.ID, 1, 2)) {
+		t.Fatal("Contains() changed after mutating source chunk")
+	}
+}
+
+func coverageDocument(ids ...int) *source.SourceDocument {
+	doc := &source.SourceDocument{ID: "session", Units: make([]source.SourceUnit, len(ids))}
+	for index, id := range ids {
+		doc.Units[index] = source.SourceUnit{ID: id}
+	}
+	return doc
+}
+
+func coverageChunk(sourceID string, ids ...int) *source.Chunk {
+	chunk := &source.Chunk{SourceID: sourceID, Units: make([]source.SourceUnit, len(ids))}
+	for index, id := range ids {
+		chunk.Units[index] = source.SourceUnit{ID: id}
+	}
+	return chunk
+}
+
+func coverageRef(sourceID string, start, end int) source.SourceRef {
+	return source.SourceRef{SourceID: sourceID, StartUnitID: start, EndUnitID: end}
+}

internal/modules/dnd/validate/combatturns/shape/validator.go

@@ -14,7 +14,7 @@ import (
 const (
 	Key        = "extract/dnd/combat-turns/shape"
 	ReasonCode = "invalid_combat_turn_shape"
-	policy     = "dnd.combat_turns.validator.shape.v1"
+	policy     = "dnd.combat_turns.validator.shape.v2"
 )
 
 type Options struct{}
@@ -33,38 +33,48 @@ func (v *Validator) CheckpointFingerprints() []pipeline.CheckpointFingerprint {
 }
 
 func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationRequest[dnd.CombatTurnList]) (contracts.ValidationResult, error) {
-	if err := Validate(req.Value); err != nil {
-		return rejection(err.Error()), nil
+	issues, corrections := assess(req.Value)
+	if len(issues) != 0 {
+		return rejection(
+			diagnostics.Aggregate("invalid combat turn shape", issues),
+			corrections.Guidance("Correct every rejected combat turn and return the complete replacement combat-turn list"),
+		), nil
 	}
 	return contracts.ValidationResult{Approved: true}, nil
 }
 
 func Validate(value dnd.CombatTurnList) error {
-	issues := issuesFor(value)
+	issues, _ := assess(value)
 	if len(issues) == 0 {
 		return nil
 	}
 	return fmt.Errorf("%s", diagnostics.Aggregate("invalid combat turn shape", issues))
 }
 
-func issuesFor(value dnd.CombatTurnList) []string {
+func assess(value dnd.CombatTurnList) ([]string, diagnostics.Corrections) {
+	var corrections diagnostics.Corrections
 	if value.CombatTurns == nil {
-		return []string{"combat_turns must be present"}
+		corrections.Add("list", "Return a `combat_turns` array; use an empty array when the scene contains no combat turns.", "")
+		return []string{"combat_turns must be present"}, corrections
 	}
 	issues := make([]string, 0)
 	for turnIndex, turn := range value.CombatTurns {
 		prefix := fmt.Sprintf("combat_turns[%d]", turnIndex)
+		record := fmt.Sprintf("Affected %s for actor %s %s.", diagnostics.Quote(string(turn.TurnKind)), diagnostics.Quote(strings.TrimSpace(turn.Actor)), diagnostics.SourceRange(turn.SourceRefs))
 		if strings.TrimSpace(turn.Actor) == "" {
 			issues = append(issues, prefix+".actor must not be empty: "+diagnostics.Quote(turn.Actor))
+			corrections.Add("actor", "Provide the contextual combatant name for every combat turn.", record)
 		}
 		if !validTurnKind(turn.TurnKind) {
 			issues = append(issues, prefix+".turn_kind is unsupported: "+diagnostics.Quote(string(turn.TurnKind)))
+			corrections.Add("kind", "Set `turn_kind` to exactly one of `turn`, `reaction`, `legendary_action`, `lair_action`, or `other`.", record)
 		}
 		if len(turn.SourceRefs) == 0 {
 			issues = append(issues, prefix+".source_refs must contain at least one reference")
+			corrections.Add("source-refs", "Provide at least one transcript source range that directly supports every combat turn.", record)
 		}
 	}
-	return issues
+	return issues, corrections
 }
 
 func validTurnKind(value dnd.CombatTurnKind) bool {
@@ -99,6 +109,6 @@ func DecodeOptions(options map[string]any) (Options, error) {
 
 func validateOptions(options map[string]any) error { _, err := DecodeOptions(options); return err }
 
-func rejection(message string) contracts.ValidationResult {
-	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: "Return a complete combat-turn list with every required field present, valid combatant names, and valid source references."}
+func rejection(message, guidance string) contracts.ValidationResult {
+	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: guidance}
 }

internal/modules/dnd/validate/combatturns/source_refs/validator.go

@@ -8,6 +8,7 @@ import (
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared/diagnostics"
 	combatshape "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/validate/combatturns/shape"
 )
@@ -15,7 +16,7 @@ import (
 const (
 	Key        = "extract/dnd/combat-turns/source_refs"
 	ReasonCode = "invalid_combat_turn_source_refs"
-	policy     = "dnd.combat_turns.validator.source_refs.v2"
+	policy     = "dnd.combat_turns.validator.source_refs.v3"
 )
 
 type Options struct{}
@@ -40,11 +41,11 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 	if err := combatshape.Validate(req.Value); err != nil {
 		return contracts.ValidationResult{Approved: true}, nil
 	}
-	var coverage *chunkCoverage
+	var coverage shared.ChunkCoverage
 	if req.Stage == string(pipeline.StageExtract) {
-		coverage = newChunkCoverage(req.Chunk)
+		coverage = shared.NewChunkCoverage(req.Chunk)
 	}
-	issues := sourceRefIssues(source.NewDocumentIndex(req.Source), req.Source, coverage, req.Value)
+	issues, corrections := sourceRefIssues(source.NewDocumentIndex(req.Source), req.Source, coverage, req.Stage == string(pipeline.StageExtract), req.Value)
 	if len(issues) == 0 {
 		return contracts.ValidationResult{Approved: true}, nil
 	}
@@ -52,54 +53,28 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 		Approved:           false,
 		ReasonCode:         ReasonCode,
 		Message:            diagnostics.Aggregate("invalid combat turn source references", issues),
-		CorrectionGuidance: "Return combat turns whose source references identify valid transcript ranges within the supplied extraction chunk and directly support each turn.",
+		CorrectionGuidance: corrections.Guidance("Correct every rejected combat-turn citation and return the complete replacement combat-turn list"),
 	}, nil
 }
 
-func sourceRefIssues(index source.DocumentIndex, doc *source.SourceDocument, coverage *chunkCoverage, value dnd.CombatTurnList) []string {
+func sourceRefIssues(index source.DocumentIndex, doc *source.SourceDocument, coverage shared.ChunkCoverage, checkCoverage bool, value dnd.CombatTurnList) ([]string, diagnostics.Corrections) {
 	issues := make([]string, 0)
+	var corrections diagnostics.Corrections
 	for turnIndex, turn := range value.CombatTurns {
 		for refIndex, ref := range turn.SourceRefs {
+			record := fmt.Sprintf("Affected %s for actor %s, citing %s.", diagnostics.Quote(string(turn.TurnKind)), diagnostics.Quote(turn.Actor), diagnostics.SourceRefRange(ref))
 			if err := index.ValidateRef(ref); err != nil {
 				issues = append(issues, fmt.Sprintf("combat_turns[%d].source_refs[%d]: %s", turnIndex, refIndex, diagnostics.Truncate(err.Error())))
+				corrections.Add("valid-range", "Use positive source range endpoints that occur in the supplied transcript, with the earlier unit first.", record)
 				continue
 			}
-			if coverage != nil && !coverage.contains(doc, ref) {
+			if checkCoverage && !coverage.Contains(index, doc, ref) {
 				issues = append(issues, fmt.Sprintf("combat_turns[%d].source_refs[%d]: source reference is outside the current extraction chunk", turnIndex, refIndex))
+				corrections.Add("chunk-range", "Use only source ranges wholly contained in the supplied extraction chunk.", record)
 			}
 		}
 	}
-	return issues
-}
-
-type chunkCoverage struct {
-	sourceID string
-	unitIDs  map[int]struct{}
-}
-
-func newChunkCoverage(chunk *source.Chunk) *chunkCoverage {
-	coverage := &chunkCoverage{sourceID: chunk.SourceID, unitIDs: make(map[int]struct{}, len(chunk.Units))}
-	for _, unit := range chunk.Units {
-		coverage.unitIDs[unit.ID] = struct{}{}
-	}
-	return coverage
-}
-
-func (coverage *chunkCoverage) contains(doc *source.SourceDocument, ref source.SourceRef) bool {
-	if coverage == nil || doc == nil || ref.SourceID != coverage.sourceID {
-		return false
-	}
-	start, startOK := source.UnitIndex(doc, ref.StartUnitID)
-	end, endOK := source.UnitIndex(doc, ref.EndUnitID)
-	if !startOK || !endOK || start > end {
-		return false
-	}
-	for position := start; position <= end; position++ {
-		if _, found := coverage.unitIDs[doc.Units[position].ID]; !found {
-			return false
-		}
-	}
-	return true
+	return issues, corrections
 }
 
 func Spec() pipeline.ValidatorSpec {

internal/modules/dnd/validate/enemyevents/engagements/validator.go

@@ -16,7 +16,7 @@ import (
 const (
 	Key        = "extract/dnd/enemy-events/engagements"
 	ReasonCode = "duplicate_enemy_engagement"
-	policy     = "dnd.enemy_events.validator.engagements.v1"
+	policy     = "dnd.enemy_events.validator.engagements.v2"
 )
 
 type Options struct{}
@@ -38,7 +38,9 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 	if enemyeventshape.Validate(req.Value) != nil {
 		return contracts.ValidationResult{Approved: true}, nil
 	}
-	seen := make(map[string]struct{})
+	seen := make(map[string]dnd.EnemyEvent)
+	issues := make([]string, 0)
+	var corrections diagnostics.Corrections
 	for _, event := range req.Value.Events {
 		if event.Kind != dnd.EnemyEventKindEngaged {
 			continue
@@ -47,18 +49,25 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 		if identity == "" {
 			continue
 		}
-		if _, found := seen[identity]; found {
+		if first, found := seen[identity]; found {
+			issues = append(issues, fmt.Sprintf("subject %s has more than one engagement in one combat scene", diagnostics.Quote(event.Name)))
+			corrections.Add(
+				"duplicate-subject",
+				"Return at most one `engaged` event for each contextual enemy name within this combat scene; keep the source ranges together on that one event.",
+				fmt.Sprintf("Affected enemy %s: first engagement %s; additional engagement %s.", diagnostics.Quote(event.Name), diagnostics.SourceRange(first.SourceRefs), diagnostics.SourceRange(event.SourceRefs)),
+			)
+			continue
+		}
+		seen[identity] = event
+	}
+	if len(issues) != 0 {
 		return contracts.ValidationResult{
 			Approved:           false,
 			ReasonCode:         ReasonCode,
-				Message: diagnostics.Aggregate("duplicate enemy engagement", []string{
-					fmt.Sprintf("subject %s has more than one engagement in one combat scene", diagnostics.Quote(event.Name)),
-				}),
-				CorrectionGuidance: "Return at most one engagement event for each contextual enemy name within the same combat scene.",
+			Message:            diagnostics.Aggregate("duplicate enemy engagement", issues),
+			CorrectionGuidance: corrections.Guidance("Correct every duplicate enemy engagement and return the complete replacement event list"),
 		}, nil
 	}
-		seen[identity] = struct{}{}
-	}
 	return contracts.ValidationResult{Approved: true}, nil
 }
 

internal/modules/dnd/validate/enemyevents/engagements/validator_test.go

@@ -66,6 +66,27 @@ func TestValidatorRegistersStrictOptionsAndPolicy(t *testing.T) {
 	}
 }
 
+func TestValidatorReportsEveryDuplicateSubjectWithContext(t *testing.T) {
+	value := events(
+		event("Ashfang", dnd.EnemyEventKindEngaged, 1),
+		event("Ashfang", dnd.EnemyEventKindEngaged, 2),
+		event("Briar", dnd.EnemyEventKindEngaged, 3),
+		event("Briar", dnd.EnemyEventKindEngaged, 4),
+	)
+	result, err := New(Options{}).Validate(context.Background(), contracts.TypedValidationRequest[dnd.EnemyEventList]{Value: value})
+	if err != nil || result.Approved {
+		t.Fatalf("Validate() = %#v, %v; want rejection", result, err)
+	}
+	for _, want := range []string{"Ashfang", "Briar", "source unit 1", "source unit 2", "source unit 3", "source unit 4"} {
+		if !strings.Contains(result.CorrectionGuidance, want) {
+			t.Fatalf("CorrectionGuidance = %q, want %q", result.CorrectionGuidance, want)
+		}
+	}
+	if strings.Contains(result.CorrectionGuidance, "events[") || strings.Contains(result.CorrectionGuidance, ReasonCode) {
+		t.Fatalf("CorrectionGuidance exposed internal diagnostics: %q", result.CorrectionGuidance)
+	}
+}
+
 func events(values ...dnd.EnemyEvent) dnd.EnemyEventList { return dnd.EnemyEventList{Events: values} }
 
 func event(name string, kind dnd.EnemyEventKind, unitID int) dnd.EnemyEvent {

internal/modules/dnd/validate/enemyevents/shape/validator.go

@@ -16,7 +16,7 @@ import (
 const (
 	Key        = "extract/dnd/enemy-events/shape"
 	ReasonCode = "invalid_enemy_event_shape"
-	policy     = "dnd.enemy_events.validator.shape.v1"
+	policy     = "dnd.enemy_events.validator.shape.v2"
 )
 
 type Options struct{}
@@ -35,38 +35,50 @@ func (v *Validator) CheckpointFingerprints() []pipeline.CheckpointFingerprint {
 }
 
 func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationRequest[dnd.EnemyEventList]) (contracts.ValidationResult, error) {
-	if err := Validate(req.Value); err != nil {
-		return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: err.Error(), CorrectionGuidance: "Return a complete enemy-event list with every required field present, valid contextual NPC names, supported event values, and valid source references."}, nil
+	issues, corrections := assess(req.Value)
+	if len(issues) != 0 {
+		return contracts.ValidationResult{
+			Approved:           false,
+			ReasonCode:         ReasonCode,
+			Message:            diagnostics.Aggregate("invalid enemy event shape", issues),
+			CorrectionGuidance: corrections.Guidance("Correct every rejected enemy event and return the complete replacement event list"),
+		}, nil
 	}
 	return contracts.ValidationResult{Approved: true}, nil
 }
 
 func Validate(value dnd.EnemyEventList) error {
-	issues := issuesFor(value)
+	issues, _ := assess(value)
 	if len(issues) == 0 {
 		return nil
 	}
 	return fmt.Errorf("%s", diagnostics.Aggregate("invalid enemy event shape", issues))
 }
 
-func issuesFor(value dnd.EnemyEventList) []string {
+func assess(value dnd.EnemyEventList) ([]string, diagnostics.Corrections) {
+	var corrections diagnostics.Corrections
 	if value.Events == nil {
-		return []string{"events must be present"}
+		corrections.Add("list", "Return an `events` array; use an empty array when the combat scene establishes no enemy events.", "")
+		return []string{"events must be present"}, corrections
 	}
 	issues := make([]string, 0)
 	for eventIndex, event := range value.Events {
 		prefix := fmt.Sprintf("events[%d]", eventIndex)
+		record := fmt.Sprintf("Affected %s event for enemy %s %s.", diagnostics.Quote(string(event.Kind)), diagnostics.Quote(strings.TrimSpace(event.Name)), diagnostics.SourceRange(event.SourceRefs))
 		if strings.TrimSpace(event.Name) == "" {
 			issues = append(issues, prefix+".name must not be empty: "+diagnostics.Quote(event.Name))
+			corrections.Add("name", "Select a nonblank contextual enemy name from the supplied NPC registry for every event.", record)
 		}
 		if !enemyeventmodel.SupportedKind(event.Kind) {
 			issues = append(issues, prefix+".kind is unsupported: "+diagnostics.Quote(string(event.Kind)))
+			corrections.Add("kind", "Set `kind` to exactly one of `engaged`, `killed`, `fled`, `captured`, or `incapacitated`.", record)
 		}
 		if len(event.SourceRefs) == 0 {
 			issues = append(issues, prefix+".source_refs must contain at least one reference")
+			corrections.Add("source-refs", "Provide at least one transcript source range that directly supports every enemy event.", record)
 		}
 	}
-	return issues
+	return issues, corrections
 }
 
 func Spec() pipeline.ValidatorSpec {

internal/modules/dnd/validate/enemyevents/source_refs/validator.go

@@ -9,6 +9,7 @@ import (
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared/diagnostics"
 	enemyeventshape "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/validate/enemyevents/shape"
 )
@@ -16,7 +17,7 @@ import (
 const (
 	Key        = "extract/dnd/enemy-events/source_refs"
 	ReasonCode = "invalid_enemy_event_source_refs"
-	policy     = "dnd.enemy_events.validator.source_refs.v1"
+	policy     = "dnd.enemy_events.validator.source_refs.v2"
 )
 
 type Options struct{}
@@ -42,61 +43,40 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 		return contracts.ValidationResult{Approved: true}, nil
 	}
 	index := source.NewDocumentIndex(req.Source)
-	var coverage *chunkCoverage
+	var coverage shared.ChunkCoverage
 	if req.Stage == string(pipeline.StageExtract) {
-		coverage = newChunkCoverage(req.Chunk)
+		coverage = shared.NewChunkCoverage(req.Chunk)
 	}
-	issues := sourceRefIssues(index, req.Source, coverage, req.Value)
+	issues, corrections := sourceRefIssues(index, req.Source, coverage, req.Stage == string(pipeline.StageExtract), req.Value)
 	if len(issues) == 0 {
 		return contracts.ValidationResult{Approved: true}, nil
 	}
-	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: diagnostics.Aggregate("invalid enemy event source references", issues), CorrectionGuidance: "Return enemy events whose source references identify valid transcript ranges within the supplied extraction chunk and directly support each event."}, nil
+	return contracts.ValidationResult{
+		Approved:           false,
+		ReasonCode:         ReasonCode,
+		Message:            diagnostics.Aggregate("invalid enemy event source references", issues),
+		CorrectionGuidance: corrections.Guidance("Correct every rejected enemy-event citation and return the complete replacement event list"),
+	}, nil
 }
 
-func sourceRefIssues(index source.DocumentIndex, doc *source.SourceDocument, coverage *chunkCoverage, value dnd.EnemyEventList) []string {
+func sourceRefIssues(index source.DocumentIndex, doc *source.SourceDocument, coverage shared.ChunkCoverage, checkCoverage bool, value dnd.EnemyEventList) ([]string, diagnostics.Corrections) {
 	issues := make([]string, 0)
+	var corrections diagnostics.Corrections
 	for eventIndex, event := range value.Events {
 		for refIndex, ref := range event.SourceRefs {
+			record := fmt.Sprintf("Affected %s event for enemy %s, citing %s.", diagnostics.Quote(string(event.Kind)), diagnostics.Quote(event.Name), diagnostics.SourceRefRange(ref))
 			if err := index.ValidateRef(ref); err != nil {
 				issues = append(issues, fmt.Sprintf("events[%d].source_refs[%d]: %s", eventIndex, refIndex, diagnostics.Truncate(err.Error())))
+				corrections.Add("valid-range", "Use positive source range endpoints that occur in the supplied transcript, with the earlier unit first.", record)
 				continue
 			}
-			if coverage != nil && !coverage.contains(doc, ref) {
+			if checkCoverage && !coverage.Contains(index, doc, ref) {
 				issues = append(issues, fmt.Sprintf("events[%d].source_refs[%d]: source reference is outside the current extraction chunk", eventIndex, refIndex))
+				corrections.Add("chunk-range", "Use only source ranges wholly contained in the supplied extraction chunk.", record)
 			}
 		}
 	}
-	return issues
-}
-
-type chunkCoverage struct {
-	sourceID string
-	unitIDs  map[int]struct{}
-}
-
-func newChunkCoverage(chunk *source.Chunk) *chunkCoverage {
-	coverage := &chunkCoverage{sourceID: chunk.SourceID, unitIDs: make(map[int]struct{}, len(chunk.Units))}
-	for _, unit := range chunk.Units {
-		coverage.unitIDs[unit.ID] = struct{}{}
-	}
-	return coverage
-}
-
-func (coverage *chunkCoverage) contains(doc *source.SourceDocument, ref source.SourceRef) bool {
-	if coverage == nil || doc == nil || ref.SourceID != coverage.sourceID {
-		return false
-	}
-	start, startOK := source.UnitIndex(doc, ref.StartUnitID)
-	end, endOK := source.UnitIndex(doc, ref.EndUnitID)
-	if !startOK || !endOK || start > end {
-		return false
-	}
-	for position := start; position <= end; position++ {
-		if _, found := coverage.unitIDs[doc.Units[position].ID]; !found {
-			return false
-		}
-	}
-	return true
+	return issues, corrections
 }
 
 func Spec() pipeline.ValidatorSpec {

internal/modules/dnd/validate/itemoccurrences/registry/validator.go

@@ -16,7 +16,7 @@ import (
 const (
 	Key        = "extract/dnd/item-occurrences/registry"
 	ReasonCode = "invalid_item_occurrence_registry"
-	policy     = "dnd.item_occurrences.validator.registry.v1"
+	policy     = "dnd.item_occurrences.validator.registry.v2"
 )
 
 type Options struct{}
@@ -76,27 +76,33 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 		return contracts.ValidationResult{}, fmt.Errorf("resolve item registry: %w", err)
 	}
 	if !registry.Bound() {
-		return rejection([]string{"item registry reference is required"}), nil
+		var corrections diagnostics.Corrections
+		corrections.Add("registry", "Use only contextual item names from the supplied item registry; omit an occurrence that cannot be matched unambiguously.", "")
+		return rejection([]string{"item registry reference is required"}, corrections), nil
 	}
 	issues := make([]string, 0)
+	var corrections diagnostics.Corrections
 	for index, occurrence := range req.Value.Occurrences {
+		record := fmt.Sprintf("Affected %s occurrence for item %s %s.", diagnostics.Quote(string(occurrence.Kind)), diagnostics.Quote(occurrence.Name), diagnostics.SourceRange(occurrence.SourceRefs))
 		item, ok := registry.LookupID(occurrence.ItemID)
 		if !ok {
 			issues = append(issues, fmt.Sprintf("occurrences[%d].item_id is not in the item registry: %s", index, diagnostics.Quote(occurrence.ItemID)))
+			corrections.Add("registry", "Use only contextual item names from the supplied item registry; omit an occurrence that cannot be matched unambiguously.", record)
 			continue
 		}
 		if occurrence.Name != item.Name {
 			issues = append(issues, fmt.Sprintf("occurrences[%d] does not match registry item %s", index, diagnostics.Quote(occurrence.ItemID)))
+			corrections.Add("canonical-name", "Use the exact contextual item name supplied by the registry.", record+" Use registry name "+diagnostics.Quote(item.Name)+".")
 		}
 	}
 	if len(issues) == 0 {
 		return contracts.ValidationResult{Approved: true}, nil
 	}
-	return rejection(issues), nil
+	return rejection(issues, corrections), nil
 }
 
-func rejection(issues []string) contracts.ValidationResult {
-	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: diagnostics.Aggregate("invalid item occurrence registry", issues), CorrectionGuidance: "Return item occurrences using contextual item names that match an item in the supplied registry; omit occurrences that cannot be matched unambiguously."}
+func rejection(issues []string, corrections diagnostics.Corrections) contracts.ValidationResult {
+	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: diagnostics.Aggregate("invalid item occurrence registry", issues), CorrectionGuidance: corrections.Guidance("Correct every rejected item occurrence and return the complete replacement occurrence list")}
 }
 func Spec() pipeline.ValidatorSpec {
 	return pipeline.ValidatorSpec{Key: Key, ExecutionClass: contracts.ExecutionClassDeterministic}

internal/modules/dnd/validate/itemoccurrences/shape/validator.go

@@ -16,7 +16,7 @@ import (
 const (
 	Key        = "extract/dnd/item-occurrences/shape"
 	ReasonCode = "invalid_item_occurrence_shape"
-	policy     = "dnd.item_occurrences.shape.v2"
+	policy     = "dnd.item_occurrences.shape.v3"
 )
 
 type Options struct{}
@@ -58,19 +58,11 @@ func Validate(value dnd.ItemOccurrenceList) error {
 
 type validationAssessment struct {
 	operatorIssues []string
-	correctionGroups []correctionGroup
-	groupIndexes     map[string]int
-}
-
-type correctionGroup struct {
-	label       string
-	rule        string
-	records     []string
-	recordsSeen map[string]struct{}
+	corrections    diagnostics.Corrections
 }
 
 func assess(value dnd.ItemOccurrenceList) validationAssessment {
-	assessment := validationAssessment{groupIndexes: make(map[string]int)}
+	var assessment validationAssessment
 	if value.Occurrences == nil {
 		assessment.operatorIssues = append(assessment.operatorIssues, "occurrences must be present")
 		assessment.addCorrection("occurrences", "item-occurrence list", "Return an `occurrences` array; use an empty array when the transcript establishes no occurrences.", "")
@@ -107,20 +99,10 @@ func assess(value dnd.ItemOccurrenceList) validationAssessment {
 }
 
 func (assessment *validationAssessment) addCorrection(key, label, rule, record string) {
-	index, ok := assessment.groupIndexes[key]
-	if !ok {
-		index = len(assessment.correctionGroups)
-		assessment.groupIndexes[key] = index
-		assessment.correctionGroups = append(assessment.correctionGroups, correctionGroup{label: label, rule: rule, recordsSeen: make(map[string]struct{})})
-	}
 	if record != "" {
-		group := &assessment.correctionGroups[index]
-		if _, seen := group.recordsSeen[record]; seen {
-			return
-		}
-		group.recordsSeen[record] = struct{}{}
-		group.records = append(group.records, record)
+		record = "Affected " + label + " record: " + record
 	}
+	assessment.corrections.Add(key, rule, record)
 }
 
 func (assessment validationAssessment) operatorMessage() string {
@@ -128,16 +110,7 @@ func (assessment validationAssessment) operatorMessage() string {
 }
 
 func (assessment validationAssessment) correctionGuidance() string {
-	issues := make([]string, 0, len(assessment.correctionGroups)+len(assessment.operatorIssues))
-	for _, group := range assessment.correctionGroups {
-		issues = append(issues, group.rule)
-	}
-	for _, group := range assessment.correctionGroups {
-		for _, record := range group.records {
-			issues = append(issues, "Affected "+group.label+" record: "+record)
-		}
-	}
-	return diagnostics.Aggregate("Correct every rejected item occurrence and return the complete replacement list", issues)
+	return assessment.corrections.Guidance("Correct every rejected item occurrence and return the complete replacement list")
 }
 
 func holderOperatorIssue(occurrence dnd.ItemOccurrence) string {
@@ -159,7 +132,7 @@ func holderExpectation(kind dnd.ItemOccurrenceKind) string {
 	case dnd.ItemOccurrenceKindConsumed:
 		return "from present and to absent"
 	case dnd.ItemOccurrenceKindTransferred:
-		return "distinct named non-party holders"
+		return "distinct named party-member holders"
 	default:
 		return "a supported holder combination"
 	}
@@ -188,19 +161,7 @@ func occurrenceContext(occurrence dnd.ItemOccurrence) string {
 	if name == "" {
 		context = "item with a blank contextual name"
 	}
-	if len(occurrence.SourceRefs) == 0 {
-		context += " without a cited source range"
-	} else {
-		ref := occurrence.SourceRefs[0]
-		if ref.StartUnitID == ref.EndUnitID {
-			context += fmt.Sprintf(" at source unit %d", ref.StartUnitID)
-		} else {
-			context += fmt.Sprintf(" at source units %d-%d", ref.StartUnitID, ref.EndUnitID)
-		}
-		if len(occurrence.SourceRefs) > 1 {
-			context += fmt.Sprintf(" (first of %d cited ranges)", len(occurrence.SourceRefs))
-		}
-	}
+	context += " " + diagnostics.SourceRange(occurrence.SourceRefs)
 	return context + " with from " + holderDisplay(occurrence.From) + " and to " + holderDisplay(occurrence.To)
 }
 

internal/modules/dnd/validate/itemoccurrences/source_refs/validator.go

@@ -9,6 +9,7 @@ import (
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared/diagnostics"
 	itemoccurrenceshape "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/validate/itemoccurrences/shape"
 )
@@ -16,7 +17,7 @@ import (
 const (
 	Key        = "extract/dnd/item-occurrences/source_refs"
 	ReasonCode = "invalid_item_occurrence_source_references"
-	policy     = "dnd.item_occurrences.source_refs.v1"
+	policy     = "dnd.item_occurrences.source_refs.v2"
 )
 
 type Options struct{}
@@ -42,59 +43,35 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 		return contracts.ValidationResult{Approved: true}, nil
 	}
 	index := source.NewDocumentIndex(req.Source)
-	var coverage *chunkCoverage
+	var coverage shared.ChunkCoverage
 	if req.Stage == string(pipeline.StageExtract) {
-		coverage = newChunkCoverage(req.Chunk)
+		coverage = shared.NewChunkCoverage(req.Chunk)
 	}
 	issues := make([]string, 0)
+	var corrections diagnostics.Corrections
 	for occurrenceIndex, occurrence := range req.Value.Occurrences {
 		for refIndex, ref := range occurrence.SourceRefs {
+			record := fmt.Sprintf("Affected %s occurrence for item %s, citing %s.", diagnostics.Quote(string(occurrence.Kind)), diagnostics.Quote(occurrence.Name), diagnostics.SourceRefRange(ref))
 			if err := index.ValidateRef(ref); err != nil {
 				issues = append(issues, fmt.Sprintf("occurrences[%d].source_refs[%d]: %s", occurrenceIndex, refIndex, diagnostics.Truncate(err.Error())))
+				corrections.Add("valid-range", "Use positive source range endpoints that occur in the supplied transcript, with the earlier unit first.", record)
 				continue
 			}
-			if coverage != nil && !coverage.contains(req.Source, ref) {
+			if req.Stage == string(pipeline.StageExtract) && !coverage.Contains(index, req.Source, ref) {
 				issues = append(issues, fmt.Sprintf("occurrences[%d].source_refs[%d]: source reference is outside the current extraction chunk", occurrenceIndex, refIndex))
+				corrections.Add("chunk-range", "Use only source ranges wholly contained in the supplied extraction chunk.", record)
 			}
 		}
 	}
 	if len(issues) == 0 {
 		return contracts.ValidationResult{Approved: true}, nil
 	}
-	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: diagnostics.Aggregate("invalid item occurrence source references", issues), CorrectionGuidance: "Return item occurrences whose source references identify valid transcript ranges within the supplied extraction chunk and directly support each occurrence."}, nil
-}
-
-type chunkCoverage struct {
-	sourceID string
-	unitIDs  map[int]struct{}
-}
-
-func newChunkCoverage(chunk *source.Chunk) *chunkCoverage {
-	coverage := &chunkCoverage{
-		sourceID: chunk.SourceID,
-		unitIDs:  make(map[int]struct{}, len(chunk.Units)),
-	}
-	for _, unit := range chunk.Units {
-		coverage.unitIDs[unit.ID] = struct{}{}
-	}
-	return coverage
-}
-
-func (coverage *chunkCoverage) contains(doc *source.SourceDocument, ref source.SourceRef) bool {
-	if coverage == nil || doc == nil || ref.SourceID != coverage.sourceID {
-		return false
-	}
-	start, startOK := source.UnitIndex(doc, ref.StartUnitID)
-	end, endOK := source.UnitIndex(doc, ref.EndUnitID)
-	if !startOK || !endOK || start > end {
-		return false
-	}
-	for position := start; position <= end; position++ {
-		if _, found := coverage.unitIDs[doc.Units[position].ID]; !found {
-			return false
-		}
-	}
-	return true
+	return contracts.ValidationResult{
+		Approved:           false,
+		ReasonCode:         ReasonCode,
+		Message:            diagnostics.Aggregate("invalid item occurrence source references", issues),
+		CorrectionGuidance: corrections.Guidance("Correct every rejected item-occurrence citation and return the complete replacement occurrence list"),
+	}, nil
 }
 
 func Spec() pipeline.ValidatorSpec {

internal/modules/dnd/validate/itemregistry/identity/validator.go

@@ -17,6 +17,7 @@ const (
 	Key              = "normalize/dnd/item-registry/identity"
 	ReasonCode       = "invalid_item_identity"
 	policy           = domainidentity.Policy
+	correctionPolicy = "dnd.item_registry.validator.identity.v2"
 )
 
 type Options struct{}
@@ -31,7 +32,7 @@ func (v *Validator) ExecutionClass() contracts.ExecutionClass {
 	return contracts.ExecutionClassDeterministic
 }
 func (v *Validator) CheckpointFingerprints() []pipeline.CheckpointFingerprint {
-	return []pipeline.CheckpointFingerprint{{Name: "policy", Value: policy}}
+	return []pipeline.CheckpointFingerprint{{Name: "policy", Value: policy}, {Name: "correction_policy", Value: correctionPolicy}}
 }
 
 func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationRequest[dnd.ItemRegistry]) (contracts.ValidationResult, error) {
@@ -43,10 +44,31 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 		return contracts.ValidationResult{Approved: true}, nil
 	}
 	issues := make([]string, len(identityIssues))
+	var corrections diagnostics.Corrections
 	for index, issue := range identityIssues {
 		issues[index] = fmt.Sprintf("items[%d] %s: %s", issue.RecordIndex, issue.Code, diagnostics.Quote(issue.Value))
+		if issue.RecordIndex < 0 || issue.RecordIndex >= len(req.Value.Items) {
+			continue
+		}
+		item := req.Value.Items[issue.RecordIndex]
+		corrections.Add(string(issue.Code), itemIdentityCorrection(issue.Code), fmt.Sprintf("Affected item %s %s.", diagnostics.Quote(item.Name), diagnostics.SourceRange(item.SourceRefs)))
+	}
+	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: diagnostics.Aggregate("invalid item identity", issues), CorrectionGuidance: corrections.Guidance("Correct the duplicate-group proposals and return the complete replacement proposal response")}, nil
+}
+
+func itemIdentityCorrection(code domainidentity.IssueCode) string {
+	switch code {
+	case domainidentity.IssueEmptyCanonicalName:
+		return "Select a canonical proposal member with a nonblank, transcript-supported item name."
+	case domainidentity.IssueDuplicateCanonical:
+		return "Put duplicate mentions of the same item in one proposal group and select one transcript-supported canonical member."
+	case domainidentity.IssueInvalidID, domainidentity.IssueIDMismatch:
+		return "Revise the proposal so its canonical item member has a valid transcript-supported name; Notarius derives durable identity without model input."
+	case domainidentity.IssueDuplicateID:
+		return "Do not use proposals that collapse distinct items into one canonical identity; group only records that describe the same item."
+	default:
+		return "Revise the duplicate-group proposal so every canonical item is transcript-supported and distinct."
 	}
-	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: diagnostics.Aggregate("invalid item identity", issues), CorrectionGuidance: "Return one canonical registry entry per distinct properly named item, combining duplicate mentions under the same transcript-supported name."}, nil
 }
 
 func Spec() pipeline.ValidatorSpec {

internal/modules/dnd/validate/itemregistry/identity/validator_test.go

@@ -21,6 +21,9 @@ func TestValidatorRejectsInvalidAndDuplicateItemIdentity(t *testing.T) {
 	if err != nil || result.Approved || result.ReasonCode != ReasonCode || !strings.Contains(result.Message, "invalid_id") || !strings.Contains(result.Message, "duplicate_canonical_identity") {
 		t.Fatalf("Validate() = %#v, %v; want identity rejection", result, err)
 	}
+	if !strings.Contains(result.CorrectionGuidance, "duplicate-group proposals") || !strings.Contains(result.CorrectionGuidance, "Rope") || strings.Contains(result.CorrectionGuidance, "wrong") || strings.Contains(result.CorrectionGuidance, "items[") {
+		t.Fatalf("CorrectionGuidance = %q, want contextual proposal guidance without IDs or operator paths", result.CorrectionGuidance)
+	}
 }
 
 func TestValidatorRegistersPolicy(t *testing.T) {
@@ -31,7 +34,7 @@ func TestValidatorRegistersPolicy(t *testing.T) {
 	if got, ok := registry.Spec(Key); !ok || got != Spec() || got.ExecutionClass != contracts.ExecutionClassDeterministic {
 		t.Fatalf("registered spec = %#v, present = %t", got, ok)
 	}
-	if got := New(Options{}).CheckpointFingerprints(); len(got) != 1 || got[0].Value != domainidentity.Policy {
+	if got := New(Options{}).CheckpointFingerprints(); len(got) != 2 || got[0].Value != domainidentity.Policy || got[1].Name != "correction_policy" || got[1].Value != correctionPolicy {
 		t.Fatalf("fingerprints = %#v", got)
 	}
 	if _, err := DecodeOptions(map[string]any{"unexpected": true}); err == nil {

internal/modules/dnd/validate/itemregistry/shape/validator.go

@@ -15,7 +15,7 @@ import (
 const (
 	Key        = "extract/dnd/item-registry/shape"
 	ReasonCode = "invalid_item_shape"
-	policy     = "dnd.item_registry.validator.shape.v1"
+	policy     = "dnd.item_registry.validator.shape.v2"
 )
 
 type Options struct{}
@@ -34,39 +34,58 @@ func (v *Validator) CheckpointFingerprints() []pipeline.CheckpointFingerprint {
 }
 
 func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationRequest[dnd.ItemRegistry]) (contracts.ValidationResult, error) {
-	issues := issuesFor(req.Value)
+	normalization := req.Stage == string(pipeline.StageNormalize)
+	issues, corrections := assess(req.Value, normalization)
 	if len(issues) > 0 {
-		return rejection(diagnostics.Aggregate("invalid item shape", issues)), nil
+		prefix := "Correct every rejected item and return the complete replacement registry"
+		if normalization {
+			prefix = "Correct the duplicate-group proposals and return the complete replacement proposal response"
+		}
+		return rejection(diagnostics.Aggregate("invalid item shape", issues), corrections.Guidance(prefix)), nil
 	}
 	return contracts.ValidationResult{Approved: true}, nil
 }
 
 func Validate(value dnd.ItemRegistry) error {
-	issues := issuesFor(value)
+	issues, _ := assess(value, false)
 	if len(issues) == 0 {
 		return nil
 	}
 	return fmt.Errorf("%s", diagnostics.Aggregate("invalid item shape", issues))
 }
 
-func issuesFor(value dnd.ItemRegistry) []string {
+func assess(value dnd.ItemRegistry, normalization bool) ([]string, diagnostics.Corrections) {
+	var corrections diagnostics.Corrections
+	nameRule := "Provide one nonblank, transcript-supported item name for every registry entry."
+	refRule := "Provide at least one transcript source range that directly supports every named item."
+	listRule := "Return an `items` array; use an empty array when the transcript establishes no named items."
+	if normalization {
+		nameRule = "Revise the duplicate-group proposals so every selected canonical item has a nonblank, transcript-supported name."
+		refRule = "Revise the duplicate-group proposals so every selected canonical item preserves direct transcript evidence."
+		listRule = "Revise the duplicate-group proposals so normalization retains the complete item candidate registry."
+	}
 	if value.Items == nil {
-		return []string{"items must be present"}
+		corrections.Add("list", listRule, "")
+		return []string{"items must be present"}, corrections
 	}
 	issues := make([]string, 0)
 	for index, item := range value.Items {
 		prefix := fmt.Sprintf("items[%d]", index)
+		record := "Affected item " + diagnostics.Quote(strings.TrimSpace(item.Name)) + " " + diagnostics.SourceRange(item.SourceRefs) + "."
 		if strings.TrimSpace(item.ID) == "" {
 			issues = append(issues, prefix+".id must not be empty")
+			corrections.Add("name", nameRule, record)
 		}
 		if strings.TrimSpace(item.Name) == "" {
 			issues = append(issues, prefix+".name must not be empty")
+			corrections.Add("name", nameRule, record)
 		}
 		if len(item.SourceRefs) == 0 {
 			issues = append(issues, prefix+".source_refs must not be empty")
+			corrections.Add("source-refs", refRule, record)
 		}
 	}
-	return issues
+	return issues, corrections
 }
 
 func Spec() pipeline.ValidatorSpec {
@@ -92,6 +111,6 @@ func DecodeOptions(options map[string]any) (Options, error) {
 
 func validateOptions(options map[string]any) error { _, err := DecodeOptions(options); return err }
 
-func rejection(message string) contracts.ValidationResult {
-	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: "Return a complete item registry containing only properly named items with valid source references."}
+func rejection(message, guidance string) contracts.ValidationResult {
+	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: guidance}
 }

internal/modules/dnd/validate/itemregistry/source_refs/validator.go

@@ -9,6 +9,7 @@ import (
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared/diagnostics"
 	itemshape "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/validate/itemregistry/shape"
 )
@@ -16,7 +17,7 @@ import (
 const (
 	Key        = "extract/dnd/item-registry/source_refs"
 	ReasonCode = "invalid_item_source_refs"
-	policy     = "dnd.item_registry.validator.source_refs.v1"
+	policy     = "dnd.item_registry.validator.source_refs.v2"
 )
 
 type Options struct{}
@@ -42,35 +43,37 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 		return contracts.ValidationResult{Approved: true}, nil
 	}
 	index := source.NewDocumentIndex(req.Source)
+	coverage := shared.NewChunkCoverage(req.Chunk)
 	issues := make([]string, 0)
+	var corrections diagnostics.Corrections
+	normalization := req.Stage == string(pipeline.StageNormalize)
+	validRangeRule := "Use positive source range endpoints that occur in the supplied transcript, with the earlier unit first."
+	guidancePrefix := "Correct every rejected item citation and return the complete replacement item registry"
+	if normalization {
+		validRangeRule = "Revise the duplicate-group proposals so every selected canonical item preserves valid transcript evidence; do not reproduce application IDs."
+		guidancePrefix = "Correct the duplicate-group proposals and return the complete replacement proposal response"
+	}
 	for itemIndex, item := range req.Value.Items {
 		for refIndex, ref := range item.SourceRefs {
+			record := fmt.Sprintf("Affected item %s, citing %s.", diagnostics.Quote(item.Name), diagnostics.SourceRefRange(ref))
 			if err := index.ValidateRef(ref); err != nil {
 				issues = append(issues, fmt.Sprintf("items[%d].source_refs[%d]: %s", itemIndex, refIndex, diagnostics.Truncate(err.Error())))
+				corrections.Add("valid-range", validRangeRule, record)
 				continue
 			}
-			if req.Stage == string(pipeline.StageExtract) && !chunkContainsRef(req.Chunk, ref) {
+			if req.Stage == string(pipeline.StageExtract) && !coverage.Contains(index, req.Source, ref) {
 				issues = append(issues, fmt.Sprintf("items[%d].source_refs[%d]: source reference is outside the current extraction chunk", itemIndex, refIndex))
+				corrections.Add("chunk-range", "Use only source ranges wholly contained in the supplied extraction chunk.", record)
 			}
 		}
 	}
 	if len(issues) == 0 {
 		return contracts.ValidationResult{Approved: true}, nil
 	}
-	return rejection(diagnostics.Aggregate("invalid item source references", issues)), nil
-}
-
-func chunkContainsRef(chunk *source.Chunk, ref source.SourceRef) bool {
-	if chunk == nil || ref.SourceID != chunk.SourceID {
-		return false
-	}
-	startFound := false
-	endFound := false
-	for _, unit := range chunk.Units {
-		startFound = startFound || unit.ID == ref.StartUnitID
-		endFound = endFound || unit.ID == ref.EndUnitID
-	}
-	return startFound && endFound
+	return rejection(
+		diagnostics.Aggregate("invalid item source references", issues),
+		corrections.Guidance(guidancePrefix),
+	), nil
 }
 
 func Spec() pipeline.ValidatorSpec {
@@ -96,6 +99,6 @@ func DecodeOptions(options map[string]any) (Options, error) {
 
 func validateOptions(options map[string]any) error { _, err := DecodeOptions(options); return err }
 
-func rejection(message string) contracts.ValidationResult {
-	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: "Return registry items whose source references identify valid transcript ranges within the supplied extraction chunk and directly support each named item."}
+func rejection(message, guidance string) contracts.ValidationResult {
+	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: guidance}
 }

internal/modules/dnd/validate/itemregistry/source_refs/validator_test.go

@@ -47,6 +47,17 @@ func TestValidatorDefersMalformedShapeAndRegisters(t *testing.T) {
 	}
 }
 
+func TestValidatorRequiresEveryUnitInCitedSpanToBeInChunk(t *testing.T) {
+	doc := &source.SourceDocument{ID: "session", Units: []source.SourceUnit{{ID: 30}, {ID: 10}, {ID: 20}}}
+	value := validItemRegistry()
+	value.Items[0].SourceRefs = []source.SourceRef{{SourceID: doc.ID, StartUnitID: 30, EndUnitID: 20}}
+	chunk := &source.Chunk{SourceID: doc.ID, Units: []source.SourceUnit{{ID: 30}, {ID: 20}}}
+	result, err := New(Options{}).Validate(context.Background(), contracts.TypedValidationRequest[dnd.ItemRegistry]{Stage: string(pipeline.StageExtract), Source: doc, Chunk: chunk, Value: value})
+	if err != nil || result.Approved || !strings.Contains(result.Message, "outside the current extraction chunk") {
+		t.Fatalf("Validate() = %#v, %v; want missing-middle-unit rejection", result, err)
+	}
+}
+
 func request(doc *source.SourceDocument, value dnd.ItemRegistry) contracts.TypedValidationRequest[dnd.ItemRegistry] {
 	return contracts.TypedValidationRequest[dnd.ItemRegistry]{Source: doc, Value: value}
 }

internal/modules/dnd/validate/locationoccurrences/registry/validator.go

@@ -16,7 +16,7 @@ import (
 const (
 	Key        = "extract/dnd/location-occurrences/registry"
 	ReasonCode = "invalid_location_occurrence_registry"
-	policy     = "dnd.location_occurrences.validator.registry.v1"
+	policy     = "dnd.location_occurrences.validator.registry.v2"
 )
 
 type Options struct{}
@@ -76,27 +76,33 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 		return contracts.ValidationResult{}, fmt.Errorf("resolve location registry: %w", err)
 	}
 	if !registry.Bound() {
-		return rejection([]string{"location registry reference is required"}), nil
+		var corrections diagnostics.Corrections
+		corrections.Add("registry", "Use only proper contextual location names from the supplied location registry; omit an occurrence that cannot be matched unambiguously.", "")
+		return rejection([]string{"location registry reference is required"}, corrections), nil
 	}
 	issues := make([]string, 0)
+	var corrections diagnostics.Corrections
 	for index, occurrence := range req.Value.Occurrences {
+		record := fmt.Sprintf("Affected %s occurrence for location %s %s.", diagnostics.Quote(string(occurrence.Kind)), diagnostics.Quote(occurrence.Name), diagnostics.SourceRange(occurrence.SourceRefs))
 		location, ok := registry.Lookup(occurrence.LocationID)
 		if !ok {
 			issues = append(issues, fmt.Sprintf("occurrences[%d].location_id is not in the location registry: %s", index, diagnostics.Quote(occurrence.LocationID)))
+			corrections.Add("registry", "Use only proper contextual location names from the supplied location registry; omit an occurrence that cannot be matched unambiguously.", record)
 			continue
 		}
 		if occurrence.Name != location.Name {
 			issues = append(issues, fmt.Sprintf("occurrences[%d] does not match registry location %s", index, diagnostics.Quote(occurrence.LocationID)))
+			corrections.Add("canonical-name", "Use the exact proper location name supplied by the registry.", record+" Use registry name "+diagnostics.Quote(location.Name)+".")
 		}
 	}
 	if len(issues) == 0 {
 		return contracts.ValidationResult{Approved: true}, nil
 	}
-	return rejection(issues), nil
+	return rejection(issues, corrections), nil
 }
 
-func rejection(issues []string) contracts.ValidationResult {
-	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: diagnostics.Aggregate("invalid location occurrence registry", issues), CorrectionGuidance: "Return location occurrences using proper contextual location names that match a location in the supplied registry; omit occurrences that cannot be matched unambiguously."}
+func rejection(issues []string, corrections diagnostics.Corrections) contracts.ValidationResult {
+	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: diagnostics.Aggregate("invalid location occurrence registry", issues), CorrectionGuidance: corrections.Guidance("Correct every rejected location occurrence and return the complete replacement occurrence list")}
 }
 
 func Spec() pipeline.ValidatorSpec {

internal/modules/dnd/validate/locationoccurrences/shape/validator.go

@@ -15,7 +15,7 @@ import (
 const (
 	Key        = "extract/dnd/location-occurrences/shape"
 	ReasonCode = "invalid_location_occurrence_shape"
-	policy     = "dnd.location_occurrences.validator.shape.v1"
+	policy     = "dnd.location_occurrences.validator.shape.v2"
 )
 
 type Options struct{}
@@ -34,41 +34,54 @@ func (v *Validator) CheckpointFingerprints() []pipeline.CheckpointFingerprint {
 }
 
 func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationRequest[dnd.LocationOccurrenceList]) (contracts.ValidationResult, error) {
-	if err := Validate(req.Value); err != nil {
-		return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: err.Error(), CorrectionGuidance: "Return a complete location-occurrence list with every required field present, valid contextual location names, supported occurrence kinds, and valid source references."}, nil
+	issues, corrections := assess(req.Value)
+	if len(issues) != 0 {
+		return contracts.ValidationResult{
+			Approved:           false,
+			ReasonCode:         ReasonCode,
+			Message:            diagnostics.Aggregate("invalid location occurrence shape", issues),
+			CorrectionGuidance: corrections.Guidance("Correct every rejected location occurrence and return the complete replacement occurrence list"),
+		}, nil
 	}
 	return contracts.ValidationResult{Approved: true}, nil
 }
 
 func Validate(value dnd.LocationOccurrenceList) error {
-	issues := issuesFor(value)
+	issues, _ := assess(value)
 	if len(issues) == 0 {
 		return nil
 	}
 	return fmt.Errorf("%s", diagnostics.Aggregate("invalid location occurrence shape", issues))
 }
 
-func issuesFor(value dnd.LocationOccurrenceList) []string {
+func assess(value dnd.LocationOccurrenceList) ([]string, diagnostics.Corrections) {
+	var corrections diagnostics.Corrections
 	if value.Occurrences == nil {
-		return []string{"occurrences must be present"}
+		corrections.Add("list", "Return an `occurrences` array; use an empty array when the transcript establishes no location occurrences.", "")
+		return []string{"occurrences must be present"}, corrections
 	}
 	issues := make([]string, 0)
 	for index, occurrence := range value.Occurrences {
 		prefix := fmt.Sprintf("occurrences[%d]", index)
+		record := fmt.Sprintf("Affected %s occurrence for location %s %s.", diagnostics.Quote(string(occurrence.Kind)), diagnostics.Quote(strings.TrimSpace(occurrence.Name)), diagnostics.SourceRange(occurrence.SourceRefs))
 		if strings.TrimSpace(occurrence.LocationID) == "" {
 			issues = append(issues, prefix+".location_id must not be empty")
+			corrections.Add("name", "Select a nonblank proper location name from the supplied registry for every occurrence.", record)
 		}
 		if strings.TrimSpace(occurrence.Name) == "" {
 			issues = append(issues, prefix+".name must not be empty")
+			corrections.Add("name", "Select a nonblank proper location name from the supplied registry for every occurrence.", record)
 		}
 		if !validKind(occurrence.Kind) {
 			issues = append(issues, prefix+".kind is unsupported: "+diagnostics.Quote(string(occurrence.Kind)))
+			corrections.Add("kind", "Set `kind` to exactly one of `visited`, `planned`, `recalled`, or `mentioned`.", record)
 		}
 		if len(occurrence.SourceRefs) == 0 {
 			issues = append(issues, prefix+".source_refs must contain at least one reference")
+			corrections.Add("source-refs", "Provide at least one transcript source range that directly supports every location occurrence.", record)
 		}
 	}
-	return issues
+	return issues, corrections
 }
 
 func validKind(value dnd.LocationOccurrenceKind) bool {

internal/modules/dnd/validate/locationoccurrences/source_refs/validator.go

@@ -9,6 +9,7 @@ import (
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared/diagnostics"
 	occurrenceshape "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/validate/locationoccurrences/shape"
 )
@@ -16,7 +17,7 @@ import (
 const (
 	Key        = "extract/dnd/location-occurrences/source_refs"
 	ReasonCode = "invalid_location_occurrence_source_refs"
-	policy     = "dnd.location_occurrences.validator.source_refs.v1"
+	policy     = "dnd.location_occurrences.validator.source_refs.v2"
 )
 
 type Options struct{}
@@ -42,35 +43,34 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 		return contracts.ValidationResult{Approved: true}, nil
 	}
 	index := source.NewDocumentIndex(req.Source)
+	coverage := shared.NewChunkCoverage(req.Chunk)
 	issues := make([]string, 0)
+	var corrections diagnostics.Corrections
 	for occurrenceIndex, occurrence := range req.Value.Occurrences {
 		for refIndex, ref := range occurrence.SourceRefs {
+			record := fmt.Sprintf("Affected %s occurrence for location %s, citing %s.", diagnostics.Quote(string(occurrence.Kind)), diagnostics.Quote(occurrence.Name), diagnostics.SourceRefRange(ref))
 			if err := index.ValidateRef(ref); err != nil {
 				issues = append(issues, fmt.Sprintf("occurrences[%d].source_refs[%d]: %s", occurrenceIndex, refIndex, diagnostics.Truncate(err.Error())))
+				corrections.Add("valid-range", "Use positive source range endpoints that occur in the supplied transcript, with the earlier unit first.", record)
 				continue
 			}
-			if req.Stage == string(pipeline.StageExtract) && !chunkContainsRef(req.Chunk, ref) {
+			if req.Stage == string(pipeline.StageExtract) && !coverage.Contains(index, req.Source, ref) {
 				issues = append(issues, fmt.Sprintf("occurrences[%d].source_refs[%d]: source reference is outside the current extraction chunk", occurrenceIndex, refIndex))
+				corrections.Add("chunk-range", "Use only source ranges wholly contained in the supplied extraction chunk.", record)
 			}
 		}
 	}
 	if len(issues) == 0 {
 		return contracts.ValidationResult{Approved: true}, nil
 	}
-	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: diagnostics.Aggregate("invalid location occurrence source references", issues), CorrectionGuidance: "Return location occurrences whose source references identify valid transcript ranges within the supplied extraction chunk and directly support each occurrence."}, nil
+	return contracts.ValidationResult{
+		Approved:           false,
+		ReasonCode:         ReasonCode,
+		Message:            diagnostics.Aggregate("invalid location occurrence source references", issues),
+		CorrectionGuidance: corrections.Guidance("Correct every rejected location-occurrence citation and return the complete replacement occurrence list"),
+	}, nil
 }
 
-func chunkContainsRef(chunk *source.Chunk, ref source.SourceRef) bool {
-	if chunk == nil || ref.SourceID != chunk.SourceID {
-		return false
-	}
-	startFound, endFound := false, false
-	for _, unit := range chunk.Units {
-		startFound = startFound || unit.ID == ref.StartUnitID
-		endFound = endFound || unit.ID == ref.EndUnitID
-	}
-	return startFound && endFound
-}
 func Spec() pipeline.ValidatorSpec {
 	return pipeline.ValidatorSpec{Key: Key, ExecutionClass: contracts.ExecutionClassDeterministic}
 }

internal/modules/dnd/validate/locationregistry/identity/validator.go

@@ -17,6 +17,7 @@ const (
 	Key              = "normalize/dnd/location-registry/identity"
 	ReasonCode       = "invalid_location_identity"
 	policy           = domainidentity.Policy
+	correctionPolicy = "dnd.location_registry.validator.identity.v2"
 )
 
 type Options struct{}
@@ -31,7 +32,7 @@ func (v *Validator) ExecutionClass() contracts.ExecutionClass {
 	return contracts.ExecutionClassDeterministic
 }
 func (v *Validator) CheckpointFingerprints() []pipeline.CheckpointFingerprint {
-	return []pipeline.CheckpointFingerprint{{Name: "policy", Value: policy}}
+	return []pipeline.CheckpointFingerprint{{Name: "policy", Value: policy}, {Name: "correction_policy", Value: correctionPolicy}}
 }
 
 func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationRequest[dnd.LocationRegistry]) (contracts.ValidationResult, error) {
@@ -43,17 +44,38 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 		return contracts.ValidationResult{Approved: true}, nil
 	}
 	issues := make([]string, len(identityIssues))
+	var corrections diagnostics.Corrections
 	for index, issue := range identityIssues {
 		issues[index] = fmt.Sprintf("locations[%d] %s: %s", issue.RecordIndex, issue.Code, diagnostics.Quote(issue.Value))
+		if issue.RecordIndex < 0 || issue.RecordIndex >= len(req.Value.Locations) {
+			continue
+		}
+		location := req.Value.Locations[issue.RecordIndex]
+		corrections.Add(string(issue.Code), locationIdentityCorrection(issue.Code), fmt.Sprintf("Affected location %s %s.", diagnostics.Quote(location.Name), diagnostics.SourceRange(location.SourceRefs)))
 	}
 	return contracts.ValidationResult{
 		Approved:           false,
 		ReasonCode:         ReasonCode,
 		Message:            diagnostics.Aggregate("invalid location identity", issues),
-		CorrectionGuidance: "Return one canonical registry entry per distinct proper location name, combining duplicate mentions of the same location.",
+		CorrectionGuidance: corrections.Guidance("Correct the duplicate-group proposals and return the complete replacement proposal response"),
 	}, nil
 }
 
+func locationIdentityCorrection(code domainidentity.IssueCode) string {
+	switch code {
+	case domainidentity.IssueEmptyCanonicalName:
+		return "Select a canonical proposal member with a nonblank, transcript-supported proper location name."
+	case domainidentity.IssueMissingEvidence:
+		return "Select a canonical proposal member that has direct transcript evidence; do not discard all supported evidence for a location."
+	case domainidentity.IssueInvalidID, domainidentity.IssueIDMismatch:
+		return "Revise the proposal so its canonical location member has a valid name and evidence anchor; Notarius derives durable identity without model input."
+	case domainidentity.IssueDuplicateID:
+		return "Do not use proposals that collapse distinct locations or evidence anchors into one canonical identity; group only records that describe the same location."
+	default:
+		return "Revise the duplicate-group proposal so every canonical location is transcript-supported and distinct."
+	}
+}
+
 func Spec() pipeline.ValidatorSpec {
 	return pipeline.ValidatorSpec{Key: Key, ExecutionClass: contracts.ExecutionClassDeterministic}
 }

internal/modules/dnd/validate/locationregistry/identity/validator_test.go

@@ -47,10 +47,13 @@ func TestValidatorDefersShapeAndRejectsDerivationAndDuplicateID(t *testing.T) {
 			t.Fatalf("message %q missing %q", result.Message, want)
 		}
 	}
+	if !strings.Contains(result.CorrectionGuidance, "duplicate-group proposals") || !strings.Contains(result.CorrectionGuidance, "Gate") || strings.Contains(result.CorrectionGuidance, "not-an-id") || strings.Contains(result.CorrectionGuidance, "locations[") {
+		t.Fatalf("CorrectionGuidance = %q, want contextual proposal guidance without IDs or operator paths", result.CorrectionGuidance)
+	}
 }
 
 func TestValidatorRegistersIdentityPolicy(t *testing.T) {
-	if got := New(Options{}).CheckpointFingerprints(); len(got) != 1 || got[0].Value != domainidentity.Policy {
+	if got := New(Options{}).CheckpointFingerprints(); len(got) != 2 || got[0].Value != domainidentity.Policy || got[1].Name != "correction_policy" || got[1].Value != correctionPolicy {
 		t.Fatalf("fingerprints = %#v", got)
 	}
 	registry := pipeline.NewValidatorRegistry()

internal/modules/dnd/validate/locationregistry/shape/validator.go

@@ -15,7 +15,7 @@ import (
 const (
 	Key        = "extract/dnd/location-registry/shape"
 	ReasonCode = "invalid_location_shape"
-	policy     = "dnd.location_registry.validator.shape.v1"
+	policy     = "dnd.location_registry.validator.shape.v2"
 )
 
 type Options struct{}
@@ -34,39 +34,58 @@ func (v *Validator) CheckpointFingerprints() []pipeline.CheckpointFingerprint {
 }
 
 func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationRequest[dnd.LocationRegistry]) (contracts.ValidationResult, error) {
-	issues := issuesFor(req.Value)
+	normalization := req.Stage == string(pipeline.StageNormalize)
+	issues, corrections := assess(req.Value, normalization)
 	if len(issues) > 0 {
-		return rejection(diagnostics.Aggregate("invalid location shape", issues)), nil
+		prefix := "Correct every rejected location and return the complete replacement registry"
+		if normalization {
+			prefix = "Correct the duplicate-group proposals and return the complete replacement proposal response"
+		}
+		return rejection(diagnostics.Aggregate("invalid location shape", issues), corrections.Guidance(prefix)), nil
 	}
 	return contracts.ValidationResult{Approved: true}, nil
 }
 
 func Validate(value dnd.LocationRegistry) error {
-	issues := issuesFor(value)
+	issues, _ := assess(value, false)
 	if len(issues) == 0 {
 		return nil
 	}
 	return fmt.Errorf("%s", diagnostics.Aggregate("invalid location shape", issues))
 }
 
-func issuesFor(value dnd.LocationRegistry) []string {
+func assess(value dnd.LocationRegistry, normalization bool) ([]string, diagnostics.Corrections) {
+	var corrections diagnostics.Corrections
+	nameRule := "Provide one nonblank, transcript-supported proper location name for every registry entry."
+	refRule := "Provide at least one transcript source range that directly supports every named location."
+	listRule := "Return a `locations` array; use an empty array when the transcript establishes no named locations."
+	if normalization {
+		nameRule = "Revise the duplicate-group proposals so every selected canonical location has a nonblank, transcript-supported proper name."
+		refRule = "Revise the duplicate-group proposals so every selected canonical location preserves direct transcript evidence."
+		listRule = "Revise the duplicate-group proposals so normalization retains the complete location candidate registry."
+	}
 	if value.Locations == nil {
-		return []string{"locations must be present"}
+		corrections.Add("list", listRule, "")
+		return []string{"locations must be present"}, corrections
 	}
 	issues := make([]string, 0)
 	for index, location := range value.Locations {
 		prefix := fmt.Sprintf("locations[%d]", index)
+		record := "Affected location " + diagnostics.Quote(strings.TrimSpace(location.Name)) + " " + diagnostics.SourceRange(location.SourceRefs) + "."
 		if strings.TrimSpace(location.ID) == "" {
 			issues = append(issues, prefix+".id must not be empty")
+			corrections.Add("name", nameRule, record)
 		}
 		if strings.TrimSpace(location.Name) == "" {
 			issues = append(issues, prefix+".name must not be empty")
+			corrections.Add("name", nameRule, record)
 		}
 		if len(location.SourceRefs) == 0 {
 			issues = append(issues, prefix+".source_refs must not be empty")
+			corrections.Add("source-refs", refRule, record)
 		}
 	}
-	return issues
+	return issues, corrections
 }
 
 func Spec() pipeline.ValidatorSpec {
@@ -92,6 +111,6 @@ func DecodeOptions(options map[string]any) (Options, error) {
 
 func validateOptions(options map[string]any) error { _, err := DecodeOptions(options); return err }
 
-func rejection(message string) contracts.ValidationResult {
-	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: "Return a complete location registry containing only properly named locations with valid source references."}
+func rejection(message, guidance string) contracts.ValidationResult {
+	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: guidance}
 }

internal/modules/dnd/validate/locationregistry/source_refs/validator.go

@@ -9,6 +9,7 @@ import (
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared/diagnostics"
 	locationshape "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/validate/locationregistry/shape"
 )
@@ -16,7 +17,7 @@ import (
 const (
 	Key        = "extract/dnd/location-registry/source_refs"
 	ReasonCode = "invalid_location_source_refs"
-	policy     = "dnd.location_registry.validator.source_refs.v2"
+	policy     = "dnd.location_registry.validator.source_refs.v3"
 )
 
 type Options struct{}
@@ -42,35 +43,37 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 		return contracts.ValidationResult{Approved: true}, nil
 	}
 	index := source.NewDocumentIndex(req.Source)
+	coverage := shared.NewChunkCoverage(req.Chunk)
 	issues := make([]string, 0)
+	var corrections diagnostics.Corrections
+	normalization := req.Stage == string(pipeline.StageNormalize)
+	validRangeRule := "Use positive source range endpoints that occur in the supplied transcript, with the earlier unit first."
+	guidancePrefix := "Correct every rejected location citation and return the complete replacement location registry"
+	if normalization {
+		validRangeRule = "Revise the duplicate-group proposals so every selected canonical location preserves valid transcript evidence; do not reproduce application IDs."
+		guidancePrefix = "Correct the duplicate-group proposals and return the complete replacement proposal response"
+	}
 	for locationIndex, location := range req.Value.Locations {
 		for refIndex, ref := range location.SourceRefs {
+			record := fmt.Sprintf("Affected location %s, citing %s.", diagnostics.Quote(location.Name), diagnostics.SourceRefRange(ref))
 			if err := index.ValidateRef(ref); err != nil {
 				issues = append(issues, fmt.Sprintf("locations[%d].source_refs[%d]: %s", locationIndex, refIndex, diagnostics.Truncate(err.Error())))
+				corrections.Add("valid-range", validRangeRule, record)
 				continue
 			}
-			if req.Stage == string(pipeline.StageExtract) && !chunkContainsRef(req.Chunk, ref) {
+			if req.Stage == string(pipeline.StageExtract) && !coverage.Contains(index, req.Source, ref) {
 				issues = append(issues, fmt.Sprintf("locations[%d].source_refs[%d]: source reference is outside the current extraction chunk", locationIndex, refIndex))
+				corrections.Add("chunk-range", "Use only source ranges wholly contained in the supplied extraction chunk.", record)
 			}
 		}
 	}
 	if len(issues) == 0 {
 		return contracts.ValidationResult{Approved: true}, nil
 	}
-	return rejection(diagnostics.Aggregate("invalid location source references", issues)), nil
-}
-
-func chunkContainsRef(chunk *source.Chunk, ref source.SourceRef) bool {
-	if chunk == nil || ref.SourceID != chunk.SourceID {
-		return false
-	}
-	startFound := false
-	endFound := false
-	for _, unit := range chunk.Units {
-		startFound = startFound || unit.ID == ref.StartUnitID
-		endFound = endFound || unit.ID == ref.EndUnitID
-	}
-	return startFound && endFound
+	return rejection(
+		diagnostics.Aggregate("invalid location source references", issues),
+		corrections.Guidance(guidancePrefix),
+	), nil
 }
 
 func Spec() pipeline.ValidatorSpec {
@@ -96,6 +99,6 @@ func DecodeOptions(options map[string]any) (Options, error) {
 
 func validateOptions(options map[string]any) error { _, err := DecodeOptions(options); return err }
 
-func rejection(message string) contracts.ValidationResult {
-	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: "Return registry locations whose source references identify valid transcript ranges within the supplied extraction chunk and directly support each proper location name."}
+func rejection(message, guidance string) contracts.ValidationResult {
+	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: guidance}
 }

internal/modules/dnd/validate/npcoccurrences/registry/validator.go

@@ -16,7 +16,7 @@ import (
 const (
 	Key        = "extract/dnd/npc-occurrences/registry"
 	ReasonCode = "invalid_npc_occurrence_registry"
-	policy     = "dnd.npc_occurrences.validator.registry.v1"
+	policy     = "dnd.npc_occurrences.validator.registry.v2"
 )
 
 type Options struct{}
@@ -84,31 +84,37 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 		return contracts.ValidationResult{}, fmt.Errorf("resolve NPC registry: %w", err)
 	}
 	if !npcRegistry.Bound() {
-		return rejection([]string{"NPC registry reference is required"}), nil
+		var corrections diagnostics.Corrections
+		corrections.Add("registry", "Use only contextual NPC names from the supplied NPC registry; omit an occurrence that cannot be matched unambiguously.", "")
+		return rejection([]string{"NPC registry reference is required"}, corrections), nil
 	}
 	issues := make([]string, 0)
+	var corrections diagnostics.Corrections
 	for index, occurrence := range req.Value.Occurrences {
+		record := fmt.Sprintf("Affected %s occurrence for NPC %s %s.", diagnostics.Quote(string(occurrence.Kind)), diagnostics.Quote(occurrence.Name), diagnostics.SourceRange(occurrence.SourceRefs))
 		canonical, ok := npcRegistry.LookupID(occurrence.NPCID)
 		if !ok {
 			issues = append(issues, fmt.Sprintf("occurrences[%d].npc_id is not in the NPC registry: %s", index, diagnostics.Quote(occurrence.NPCID)))
+			corrections.Add("registry", "Use only contextual NPC names from the supplied NPC registry; omit an occurrence that cannot be matched unambiguously.", record)
 			continue
 		}
 		if occurrence.Name != canonical.Name {
 			issues = append(issues, fmt.Sprintf("occurrences[%d].name does not match npc_id: %s", index, diagnostics.Quote(occurrence.Name)))
+			corrections.Add("canonical-name", "Use the exact contextual NPC name supplied by the registry.", record+" Use registry name "+diagnostics.Quote(canonical.Name)+".")
 		}
 	}
 	if len(issues) == 0 {
 		return contracts.ValidationResult{Approved: true}, nil
 	}
-	return rejection(issues), nil
+	return rejection(issues, corrections), nil
 }
 
-func rejection(issues []string) contracts.ValidationResult {
+func rejection(issues []string, corrections diagnostics.Corrections) contracts.ValidationResult {
 	return contracts.ValidationResult{
 		Approved:           false,
 		ReasonCode:         ReasonCode,
 		Message:            diagnostics.Aggregate("invalid NPC occurrence registry", issues),
-		CorrectionGuidance: "Return NPC occurrences using contextual NPC names that match an NPC in the supplied registry; omit occurrences that cannot be matched unambiguously.",
+		CorrectionGuidance: corrections.Guidance("Correct every rejected NPC occurrence and return the complete replacement occurrence list"),
 	}
 }
 

internal/modules/dnd/validate/npcoccurrences/shape/validator.go

@@ -15,7 +15,7 @@ import (
 const (
 	Key        = "extract/dnd/npc-occurrences/shape"
 	ReasonCode = "invalid_npc_occurrence_shape"
-	policy     = "dnd.npc_occurrences.validator.shape.v1"
+	policy     = "dnd.npc_occurrences.validator.shape.v2"
 )
 
 type Options struct{}
@@ -34,41 +34,54 @@ func (v *Validator) CheckpointFingerprints() []pipeline.CheckpointFingerprint {
 }
 
 func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationRequest[dnd.NPCOccurrenceList]) (contracts.ValidationResult, error) {
-	if err := Validate(req.Value); err != nil {
-		return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: err.Error(), CorrectionGuidance: "Return a complete NPC-occurrence list with every required field present, valid contextual NPC names, supported interaction kinds, and valid source references."}, nil
+	issues, corrections := assess(req.Value)
+	if len(issues) != 0 {
+		return contracts.ValidationResult{
+			Approved:           false,
+			ReasonCode:         ReasonCode,
+			Message:            diagnostics.Aggregate("invalid NPC occurrence shape", issues),
+			CorrectionGuidance: corrections.Guidance("Correct every rejected NPC occurrence and return the complete replacement occurrence list"),
+		}, nil
 	}
 	return contracts.ValidationResult{Approved: true}, nil
 }
 
 func Validate(value dnd.NPCOccurrenceList) error {
-	issues := issuesFor(value)
+	issues, _ := assess(value)
 	if len(issues) == 0 {
 		return nil
 	}
 	return fmt.Errorf("%s", diagnostics.Aggregate("invalid NPC occurrence shape", issues))
 }
 
-func issuesFor(value dnd.NPCOccurrenceList) []string {
+func assess(value dnd.NPCOccurrenceList) ([]string, diagnostics.Corrections) {
+	var corrections diagnostics.Corrections
 	if value.Occurrences == nil {
-		return []string{"occurrences must be present"}
+		corrections.Add("list", "Return an `occurrences` array; use an empty array when the transcript establishes no NPC occurrences.", "")
+		return []string{"occurrences must be present"}, corrections
 	}
 	issues := make([]string, 0)
 	for index, occurrence := range value.Occurrences {
 		prefix := fmt.Sprintf("occurrences[%d]", index)
+		record := fmt.Sprintf("Affected %s occurrence for NPC %s %s.", diagnostics.Quote(string(occurrence.Kind)), diagnostics.Quote(strings.TrimSpace(occurrence.Name)), diagnostics.SourceRange(occurrence.SourceRefs))
 		if strings.TrimSpace(occurrence.NPCID) == "" {
 			issues = append(issues, prefix+".npc_id must not be empty: "+diagnostics.Quote(occurrence.NPCID))
+			corrections.Add("name", "Select a nonblank contextual NPC name from the supplied registry for every occurrence.", record)
 		}
 		if strings.TrimSpace(occurrence.Name) == "" {
 			issues = append(issues, prefix+".name must not be empty: "+diagnostics.Quote(occurrence.Name))
+			corrections.Add("name", "Select a nonblank contextual NPC name from the supplied registry for every occurrence.", record)
 		}
 		if !validKind(occurrence.Kind) {
 			issues = append(issues, prefix+".kind is unsupported: "+diagnostics.Quote(string(occurrence.Kind)))
+			corrections.Add("kind", "Set `kind` to exactly one of `mentioned`, `noncombat_presence`, `dialogue`, `combat_ally`, `combat_opponent`, or `other`.", record)
 		}
 		if len(occurrence.SourceRefs) == 0 {
 			issues = append(issues, prefix+".source_refs must contain at least one reference")
+			corrections.Add("source-refs", "Provide at least one transcript source range that directly supports every NPC occurrence.", record)
 		}
 	}
-	return issues
+	return issues, corrections
 }
 
 func validKind(value dnd.NPCOccurrenceKind) bool {

internal/modules/dnd/validate/npcoccurrences/source_refs/validator.go

@@ -9,6 +9,7 @@ import (
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared/diagnostics"
 	occurrenceshape "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/validate/npcoccurrences/shape"
 )
@@ -16,7 +17,7 @@ import (
 const (
 	Key        = "extract/dnd/npc-occurrences/source_refs"
 	ReasonCode = "invalid_npc_occurrence_source_refs"
-	policy     = "dnd.npc_occurrences.validator.source_refs.v2"
+	policy     = "dnd.npc_occurrences.validator.source_refs.v3"
 )
 
 type Options struct{}
@@ -42,18 +43,23 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 		return contracts.ValidationResult{Approved: true}, nil
 	}
 	index := source.NewDocumentIndex(req.Source)
+	coverage := shared.NewChunkCoverage(req.Chunk)
 	issues := make([]string, 0)
+	var corrections diagnostics.Corrections
 	for occurrenceIndex, occurrence := range req.Value.Occurrences {
 		for refIndex, ref := range occurrence.SourceRefs {
+			record := fmt.Sprintf("Affected %s occurrence for NPC %s, citing %s.", diagnostics.Quote(string(occurrence.Kind)), diagnostics.Quote(occurrence.Name), diagnostics.SourceRefRange(ref))
 			if err := index.ValidateRef(ref); err != nil {
 				issues = append(issues, fmt.Sprintf("occurrences[%d].source_refs[%d]: %s", occurrenceIndex, refIndex, diagnostics.Truncate(err.Error())))
+				corrections.Add("valid-range", "Use positive source range endpoints that occur in the supplied transcript, with the earlier unit first.", record)
 				continue
 			}
-			if req.Stage == string(pipeline.StageExtract) && !chunkContainsRef(req.Chunk, ref) {
+			if req.Stage == string(pipeline.StageExtract) && !coverage.Contains(index, req.Source, ref) {
 				issues = append(issues, fmt.Sprintf(
 					"occurrences[%d].source_refs[%d]: source reference is outside the current extraction chunk",
 					occurrenceIndex, refIndex,
 				))
+				corrections.Add("chunk-range", "Use only source ranges wholly contained in the supplied extraction chunk.", record)
 			}
 		}
 	}
@@ -64,23 +70,10 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 		Approved:           false,
 		ReasonCode:         ReasonCode,
 		Message:            diagnostics.Aggregate("invalid NPC occurrence source references", issues),
-		CorrectionGuidance: "Return NPC occurrences whose source references identify valid transcript ranges within the supplied extraction chunk and directly support each occurrence.",
+		CorrectionGuidance: corrections.Guidance("Correct every rejected NPC-occurrence citation and return the complete replacement occurrence list"),
 	}, nil
 }
 
-func chunkContainsRef(chunk *source.Chunk, ref source.SourceRef) bool {
-	if chunk == nil || ref.SourceID != chunk.SourceID {
-		return false
-	}
-	startFound := false
-	endFound := false
-	for _, unit := range chunk.Units {
-		startFound = startFound || unit.ID == ref.StartUnitID
-		endFound = endFound || unit.ID == ref.EndUnitID
-	}
-	return startFound && endFound
-}
-
 func Spec() pipeline.ValidatorSpec {
 	return pipeline.ValidatorSpec{Key: Key, ExecutionClass: contracts.ExecutionClassDeterministic}
 }

internal/modules/dnd/validate/npcregistry/identity/validator.go

@@ -17,6 +17,7 @@ const (
 	Key              = "normalize/dnd/npc-registry/identity"
 	ReasonCode       = "invalid_npc_identity"
 	policy           = domainidentity.Policy
+	correctionPolicy = "dnd.npc_registry.validator.identity.v2"
 )
 
 type Options struct{}
@@ -33,7 +34,7 @@ func (v *Validator) ExecutionClass() contracts.ExecutionClass {
 }
 
 func (v *Validator) CheckpointFingerprints() []pipeline.CheckpointFingerprint {
-	return []pipeline.CheckpointFingerprint{{Name: "policy", Value: policy}}
+	return []pipeline.CheckpointFingerprint{{Name: "policy", Value: policy}, {Name: "correction_policy", Value: correctionPolicy}}
 }
 
 func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationRequest[dnd.NPCRegistry]) (contracts.ValidationResult, error) {
@@ -46,18 +47,39 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 	}
 
 	issues := make([]string, len(identityIssues))
+	var corrections diagnostics.Corrections
 	for index, issue := range identityIssues {
 		location := fmt.Sprintf("npcs[%d]", issue.RecordIndex)
 		issues[index] = fmt.Sprintf("%s %s: %s", location, issue.Code, diagnostics.Quote(issue.Value))
+		if issue.RecordIndex < 0 || issue.RecordIndex >= len(req.Value.NPCs) {
+			continue
+		}
+		npc := req.Value.NPCs[issue.RecordIndex]
+		corrections.Add(string(issue.Code), npcIdentityCorrection(issue.Code), fmt.Sprintf("Affected NPC %s %s.", diagnostics.Quote(npc.Name), diagnostics.SourceRange(npc.SourceRefs)))
 	}
 	return contracts.ValidationResult{
 		Approved:           false,
 		ReasonCode:         ReasonCode,
 		Message:            diagnostics.Aggregate("invalid NPC identity", issues),
-		CorrectionGuidance: "Return one canonical registry entry per distinct properly named NPC, combining duplicate mentions under the same transcript-supported name.",
+		CorrectionGuidance: corrections.Guidance("Correct the duplicate-group proposals and return the complete replacement proposal response"),
 	}, nil
 }
 
+func npcIdentityCorrection(code domainidentity.IssueCode) string {
+	switch code {
+	case domainidentity.IssueEmptyCanonicalName:
+		return "Select a canonical proposal member with a nonblank, transcript-supported proper NPC name."
+	case domainidentity.IssueDuplicateCanonical:
+		return "Put duplicate mentions of the same NPC in one proposal group and select one transcript-supported canonical member."
+	case domainidentity.IssueInvalidID, domainidentity.IssueIDMismatch:
+		return "Revise the proposal so its canonical NPC member has a valid transcript-supported name; Notarius derives durable identity without model input."
+	case domainidentity.IssueDuplicateID:
+		return "Do not use proposals that collapse distinct NPCs into one canonical identity; group only records that describe the same NPC."
+	default:
+		return "Revise the duplicate-group proposal so every canonical NPC is transcript-supported and distinct."
+	}
+}
+
 func Spec() pipeline.ValidatorSpec {
 	return pipeline.ValidatorSpec{Key: Key, ExecutionClass: contracts.ExecutionClassDeterministic}
 }

internal/modules/dnd/validate/npcregistry/identity/validator_test.go

@@ -21,7 +21,7 @@ func TestValidatorContractAndRegistration(t *testing.T) {
 	if _, err := DecodeOptions(map[string]any{"unexpected": true}); err == nil || !strings.Contains(err.Error(), "unknown option") {
 		t.Fatalf("DecodeOptions() error = %v, want unknown option error", err)
 	}
-	if got := New(Options{}).CheckpointFingerprints(); len(got) != 1 || got[0].Name != "policy" || got[0].Value != policy {
+	if got := New(Options{}).CheckpointFingerprints(); len(got) != 2 || got[0].Name != "policy" || got[0].Value != policy || got[1].Name != "correction_policy" || got[1].Value != correctionPolicy {
 		t.Fatalf("fingerprints = %#v, want identity policy", got)
 	}
 
@@ -65,6 +65,9 @@ func TestValidatorDefersShapeAndRejectsIdentityIssues(t *testing.T) {
 			t.Fatalf("identity message %q missing %q", result.Message, want)
 		}
 	}
+	if !strings.Contains(result.CorrectionGuidance, "duplicate-group proposals") || !strings.Contains(result.CorrectionGuidance, value.NPCs[0].Name) || strings.Contains(result.CorrectionGuidance, value.NPCs[0].ID) || strings.Contains(result.CorrectionGuidance, "npcs[") {
+		t.Fatalf("CorrectionGuidance = %q, want contextual proposal guidance without IDs or operator paths", result.CorrectionGuidance)
+	}
 }
 
 func TestValidatorBoundsUnicodeDiagnostics(t *testing.T) {

internal/modules/dnd/validate/npcregistry/shape/validator.go

@@ -14,7 +14,7 @@ import (
 const (
 	Key        = "extract/dnd/npc-registry/shape"
 	ReasonCode = "invalid_npc_shape"
-	policy     = "dnd.npc_registry.validator.shape.v1"
+	policy     = "dnd.npc_registry.validator.shape.v2"
 )
 
 type Options struct{}
@@ -33,39 +33,58 @@ func (v *Validator) CheckpointFingerprints() []pipeline.CheckpointFingerprint {
 }
 
 func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationRequest[dnd.NPCRegistry]) (contracts.ValidationResult, error) {
-	issues := issuesFor(req.Value)
+	normalization := req.Stage == string(pipeline.StageNormalize)
+	issues, corrections := assess(req.Value, normalization)
 	if len(issues) > 0 {
-		return rejection(diagnostics.Aggregate("invalid NPC shape", issues)), nil
+		prefix := "Correct every rejected NPC and return the complete replacement registry"
+		if normalization {
+			prefix = "Correct the duplicate-group proposals and return the complete replacement proposal response"
+		}
+		return rejection(diagnostics.Aggregate("invalid NPC shape", issues), corrections.Guidance(prefix)), nil
 	}
 	return contracts.ValidationResult{Approved: true}, nil
 }
 
 func Validate(value dnd.NPCRegistry) error {
-	issues := issuesFor(value)
+	issues, _ := assess(value, false)
 	if len(issues) == 0 {
 		return nil
 	}
 	return fmt.Errorf("%s", diagnostics.Aggregate("invalid NPC shape", issues))
 }
 
-func issuesFor(value dnd.NPCRegistry) []string {
+func assess(value dnd.NPCRegistry, normalization bool) ([]string, diagnostics.Corrections) {
+	var corrections diagnostics.Corrections
+	nameRule := "Provide one nonblank, transcript-supported proper NPC name for every registry entry."
+	refRule := "Provide at least one transcript source range that directly supports every named NPC."
+	listRule := "Return an `npcs` array; use an empty array when the transcript establishes no named NPCs."
+	if normalization {
+		nameRule = "Revise the duplicate-group proposals so every selected canonical NPC has a nonblank, transcript-supported proper name."
+		refRule = "Revise the duplicate-group proposals so every selected canonical NPC preserves direct transcript evidence."
+		listRule = "Revise the duplicate-group proposals so normalization retains the complete NPC candidate registry."
+	}
 	issues := make([]string, 0)
 	if value.NPCs == nil {
-		return []string{"npcs must be present"}
+		corrections.Add("list", listRule, "")
+		return []string{"npcs must be present"}, corrections
 	}
 	for index, npc := range value.NPCs {
 		prefix := fmt.Sprintf("npcs[%d]", index)
+		record := "Affected NPC " + diagnostics.Quote(strings.TrimSpace(npc.Name)) + " " + diagnostics.SourceRange(npc.SourceRefs) + "."
 		if strings.TrimSpace(npc.ID) == "" {
 			issues = append(issues, prefix+".id must not be empty")
+			corrections.Add("name", nameRule, record)
 		}
 		if strings.TrimSpace(npc.Name) == "" {
 			issues = append(issues, prefix+".name must not be empty")
+			corrections.Add("name", nameRule, record)
 		}
 		if len(npc.SourceRefs) == 0 {
 			issues = append(issues, prefix+".source_refs must not be empty")
+			corrections.Add("source-refs", refRule, record)
 		}
 	}
-	return issues
+	return issues, corrections
 }
 
 func Spec() pipeline.ValidatorSpec {
@@ -91,6 +110,6 @@ func DecodeOptions(options map[string]any) (Options, error) {
 
 func validateOptions(options map[string]any) error { _, err := DecodeOptions(options); return err }
 
-func rejection(message string) contracts.ValidationResult {
-	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: "Return a complete NPC registry containing only properly named NPCs with valid source references."}
+func rejection(message, guidance string) contracts.ValidationResult {
+	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: guidance}
 }

internal/modules/dnd/validate/npcregistry/shape/validator_test.go

@@ -50,7 +50,7 @@ func TestValidatorBoundsDiagnosticsAndQuotesUnicode(t *testing.T) {
 }
 
 func TestValidatorSpecCheckpointAndRegistration(t *testing.T) {
-	if got := New(Options{}).CheckpointFingerprints(); len(got) != 1 || got[0].Name != "policy" || got[0].Value != "dnd.npc_registry.validator.shape.v1" {
+	if got := New(Options{}).CheckpointFingerprints(); len(got) != 1 || got[0].Name != "policy" || got[0].Value != policy {
 		t.Fatalf("CheckpointFingerprints() = %#v, want local policy", got)
 	}
 	if spec := Spec(); spec.Key != Key || spec.ExecutionClass != contracts.ExecutionClassDeterministic {
@@ -74,6 +74,21 @@ func TestValidatorDoesNotMutateValue(t *testing.T) {
 	}
 }
 
+func TestValidatorUsesProposalGuidanceDuringNormalization(t *testing.T) {
+	value := validNPCRegistry()
+	value.NPCs[0].ID = "npc:sha256:opaque"
+	value.NPCs[0].Name = ""
+	req := requestWithValue(value)
+	req.Stage = string(pipeline.StageNormalize)
+	result, err := New(Options{}).Validate(context.Background(), req)
+	if err != nil || result.Approved {
+		t.Fatalf("Validate() = %#v, %v; want rejection", result, err)
+	}
+	if !strings.Contains(result.CorrectionGuidance, "duplicate-group proposals") || strings.Contains(result.CorrectionGuidance, value.NPCs[0].ID) || strings.Contains(result.CorrectionGuidance, "npcs[") {
+		t.Fatalf("CorrectionGuidance = %q, want proposal guidance without IDs or operator paths", result.CorrectionGuidance)
+	}
+}
+
 func requestWithValue(value dnd.NPCRegistry) contracts.TypedValidationRequest[dnd.NPCRegistry] {
 	return contracts.TypedValidationRequest[dnd.NPCRegistry]{Value: value}
 }

internal/modules/dnd/validate/npcregistry/source_refs/validator.go

@@ -8,6 +8,7 @@ import (
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared/diagnostics"
 	npcshape "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/validate/npcregistry/shape"
 )
@@ -15,7 +16,7 @@ import (
 const (
 	Key        = "extract/dnd/npc-registry/source_refs"
 	ReasonCode = "invalid_npc_source_refs"
-	policy     = "dnd.npc_registry.validator.source_refs.v2"
+	policy     = "dnd.npc_registry.validator.source_refs.v3"
 )
 
 type Options struct{}
@@ -41,56 +42,40 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 		return contracts.ValidationResult{Approved: true}, nil
 	}
 	index := source.NewDocumentIndex(req.Source)
-	var coverage *chunkCoverage
+	var coverage shared.ChunkCoverage
 	if req.Stage == string(pipeline.StageExtract) {
-		coverage = newChunkCoverage(req.Chunk)
+		coverage = shared.NewChunkCoverage(req.Chunk)
 	}
 	issues := make([]string, 0)
+	var corrections diagnostics.Corrections
+	normalization := req.Stage == string(pipeline.StageNormalize)
+	validRangeRule := "Use positive source range endpoints that occur in the supplied transcript, with the earlier unit first."
+	guidancePrefix := "Correct every rejected NPC citation and return the complete replacement NPC registry"
+	if normalization {
+		validRangeRule = "Revise the duplicate-group proposals so every selected canonical NPC preserves valid transcript evidence; do not reproduce application IDs."
+		guidancePrefix = "Correct the duplicate-group proposals and return the complete replacement proposal response"
+	}
 	for npcIndex, npc := range req.Value.NPCs {
 		for refIndex, ref := range npc.SourceRefs {
+			record := fmt.Sprintf("Affected NPC %s, citing %s.", diagnostics.Quote(npc.Name), diagnostics.SourceRefRange(ref))
 			if err := index.ValidateRef(ref); err != nil {
 				issues = append(issues, fmt.Sprintf("npcs[%d].source_refs[%d]: %s", npcIndex, refIndex, diagnostics.Truncate(err.Error())))
+				corrections.Add("valid-range", validRangeRule, record)
 				continue
 			}
-			if coverage != nil && !coverage.contains(req.Source, ref) {
+			if req.Stage == string(pipeline.StageExtract) && !coverage.Contains(index, req.Source, ref) {
 				issues = append(issues, fmt.Sprintf("npcs[%d].source_refs[%d]: source reference is outside the current extraction chunk", npcIndex, refIndex))
+				corrections.Add("chunk-range", "Use only source ranges wholly contained in the supplied extraction chunk.", record)
 			}
 		}
 	}
 	if len(issues) == 0 {
 		return contracts.ValidationResult{Approved: true}, nil
 	}
-	return rejection(diagnostics.Aggregate("invalid NPC source references", issues)), nil
-}
-
-type chunkCoverage struct {
-	sourceID string
-	unitIDs  map[int]struct{}
-}
-
-func newChunkCoverage(chunk *source.Chunk) *chunkCoverage {
-	coverage := &chunkCoverage{sourceID: chunk.SourceID, unitIDs: make(map[int]struct{}, len(chunk.Units))}
-	for _, unit := range chunk.Units {
-		coverage.unitIDs[unit.ID] = struct{}{}
-	}
-	return coverage
-}
-
-func (coverage *chunkCoverage) contains(doc *source.SourceDocument, ref source.SourceRef) bool {
-	if coverage == nil || doc == nil || ref.SourceID != coverage.sourceID {
-		return false
-	}
-	start, startOK := source.UnitIndex(doc, ref.StartUnitID)
-	end, endOK := source.UnitIndex(doc, ref.EndUnitID)
-	if !startOK || !endOK || start > end {
-		return false
-	}
-	for position := start; position <= end; position++ {
-		if _, found := coverage.unitIDs[doc.Units[position].ID]; !found {
-			return false
-		}
-	}
-	return true
+	return rejection(
+		diagnostics.Aggregate("invalid NPC source references", issues),
+		corrections.Guidance(guidancePrefix),
+	), nil
 }
 
 func Spec() pipeline.ValidatorSpec {
@@ -116,6 +101,6 @@ func DecodeOptions(options map[string]any) (Options, error) {
 
 func validateOptions(options map[string]any) error { _, err := DecodeOptions(options); return err }
 
-func rejection(message string) contracts.ValidationResult {
-	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: "Return registry NPCs whose source references identify valid transcript ranges within the supplied extraction chunk and directly support each proper NPC name."}
+func rejection(message, guidance string) contracts.ValidationResult {
+	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: guidance}
 }

internal/modules/dnd/validate/npcregistry/source_refs/validator_test.go

@@ -70,6 +70,20 @@ func TestValidatorDefersMalformedShape(t *testing.T) {
 	}
 }
 
+func TestValidatorUsesProposalGuidanceDuringNormalization(t *testing.T) {
+	value := validNPCRegistry()
+	value.NPCs[0].SourceRefs = []source.SourceRef{{SourceID: "session", StartUnitID: 99, EndUnitID: 99}}
+	req := requestWithValue(validDocument(), value)
+	req.Stage = string(pipeline.StageNormalize)
+	result, err := New(Options{}).Validate(context.Background(), req)
+	if err != nil || result.Approved {
+		t.Fatalf("Validate() = %#v, %v; want rejection", result, err)
+	}
+	if !strings.Contains(result.CorrectionGuidance, "duplicate-group proposals") || !strings.Contains(result.CorrectionGuidance, "Mira Thorn") || strings.Contains(result.CorrectionGuidance, "npcs[") {
+		t.Fatalf("CorrectionGuidance = %q, want contextual proposal guidance", result.CorrectionGuidance)
+	}
+}
+
 func TestValidatorBoundsDiagnosticsAndHandlesMissingDocument(t *testing.T) {
 	value := validNPCRegistry()
 	value.NPCs[0].SourceRefs = make([]source.SourceRef, 24)
@@ -86,7 +100,7 @@ func TestValidatorBoundsDiagnosticsAndHandlesMissingDocument(t *testing.T) {
 }
 
 func TestValidatorSpecCheckpointAndRegistration(t *testing.T) {
-	if got := New(Options{}).CheckpointFingerprints(); len(got) != 1 || got[0].Name != "policy" || got[0].Value != "dnd.npc_registry.validator.source_refs.v2" {
+	if got := New(Options{}).CheckpointFingerprints(); len(got) != 1 || got[0].Name != "policy" || got[0].Value != policy {
 		t.Fatalf("CheckpointFingerprints() = %#v, want local policy", got)
 	}
 	if Spec().ExecutionClass != contracts.ExecutionClassDeterministic {

internal/modules/dnd/validate/scenedescriptions/shape/validator.go

@@ -15,7 +15,7 @@ import (
 const (
 	Key        = "extract/dnd/scene-descriptions/shape"
 	ReasonCode = "invalid_scene_description_shape"
-	policy     = "dnd.scene_descriptions.validator.shape.v1"
+	policy     = "dnd.scene_descriptions.validator.shape.v2"
 )
 
 type Options struct{}
@@ -34,8 +34,14 @@ func (v *Validator) CheckpointFingerprints() []pipeline.CheckpointFingerprint {
 }
 
 func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationRequest[dnd.SceneDescriptionList]) (contracts.ValidationResult, error) {
-	if err := ValidateForStage(req.Value, req.Stage); err != nil {
-		return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: err.Error(), CorrectionGuidance: "Return a complete scene-description list with the required number of scenes, supported scene kinds, nonblank titles and summaries, and valid source references."}, nil
+	issues, corrections := assess(req.Value, req.Stage == string(pipeline.StageExtract))
+	if len(issues) != 0 {
+		return contracts.ValidationResult{
+			Approved:           false,
+			ReasonCode:         ReasonCode,
+			Message:            diagnostics.Aggregate("invalid scene description shape", issues),
+			CorrectionGuidance: corrections.Guidance("Correct the rejected scene description and return the complete replacement response"),
+		}, nil
 	}
 	return contracts.ValidationResult{Approved: true}, nil
 }
@@ -47,38 +53,53 @@ func ValidateForStage(value dnd.SceneDescriptionList, stage string) error {
 }
 
 func validate(value dnd.SceneDescriptionList, exactlyOne bool) error {
-	issues := make([]string, 0)
-	if value.Scenes == nil {
-		issues = append(issues, "scenes must be present")
-	} else if len(value.Scenes) == 0 {
-		issues = append(issues, "scenes must not be empty")
-	} else if exactlyOne && len(value.Scenes) != 1 {
-		issues = append(issues, "extraction must contain exactly one scene")
-	}
-	for index, scene := range value.Scenes {
-		prefix := fmt.Sprintf("scenes[%d]", index)
-		if strings.TrimSpace(scene.ID) == "" || scene.ID != strings.TrimSpace(scene.ID) {
-			issues = append(issues, prefix+".id must be non-empty and trimmed")
-		}
-		if !ValidKind(scene.Kind) {
-			issues = append(issues, prefix+".kind is unsupported: "+diagnostics.Quote(string(scene.Kind)))
-		}
-		if strings.TrimSpace(scene.Title) == "" || scene.Title != strings.TrimSpace(scene.Title) {
-			issues = append(issues, prefix+".title must be non-empty and trimmed")
-		}
-		if strings.TrimSpace(scene.Summary) == "" || scene.Summary != strings.TrimSpace(scene.Summary) {
-			issues = append(issues, prefix+".summary must be non-empty and trimmed")
-		}
-		if strings.TrimSpace(scene.SourceRef.SourceID) == "" || scene.SourceRef.SourceID != strings.TrimSpace(scene.SourceRef.SourceID) || scene.SourceRef.StartUnitID <= 0 || scene.SourceRef.EndUnitID <= 0 {
-			issues = append(issues, prefix+".source_ref must have a trimmed source ID and positive unit IDs")
-		}
-	}
+	issues, _ := assess(value, exactlyOne)
 	if len(issues) == 0 {
 		return nil
 	}
 	return fmt.Errorf("%s", diagnostics.Aggregate("invalid scene description shape", issues))
 }
 
+func assess(value dnd.SceneDescriptionList, exactlyOne bool) ([]string, diagnostics.Corrections) {
+	issues := make([]string, 0)
+	var corrections diagnostics.Corrections
+	if value.Scenes == nil {
+		issues = append(issues, "scenes must be present")
+		corrections.Add("scene", "Return one scene description for the supplied extraction chunk.", "")
+	} else if len(value.Scenes) == 0 {
+		issues = append(issues, "scenes must not be empty")
+		corrections.Add("scene", "Return one scene description for the supplied extraction chunk.", "")
+	} else if exactlyOne && len(value.Scenes) != 1 {
+		issues = append(issues, "extraction must contain exactly one scene")
+		corrections.Add("scene", "Return exactly one scene description for the supplied extraction chunk.", "")
+	}
+	for index, scene := range value.Scenes {
+		prefix := fmt.Sprintf("scenes[%d]", index)
+		record := fmt.Sprintf("Affected scene titled %s with kind %s, citing %s.", diagnostics.Quote(strings.TrimSpace(scene.Title)), diagnostics.Quote(string(scene.Kind)), diagnostics.SourceRefRange(scene.SourceRef))
+		if strings.TrimSpace(scene.ID) == "" || scene.ID != strings.TrimSpace(scene.ID) {
+			issues = append(issues, prefix+".id must be non-empty and trimmed")
+			corrections.Add("scene", "Return exactly one scene description for the supplied extraction chunk.", record)
+		}
+		if !ValidKind(scene.Kind) {
+			issues = append(issues, prefix+".kind is unsupported: "+diagnostics.Quote(string(scene.Kind)))
+			corrections.Add("kind", "Set `kind` to exactly one of `combat`, `narrative`, `recap`, or `meta`.", record)
+		}
+		if strings.TrimSpace(scene.Title) == "" || scene.Title != strings.TrimSpace(scene.Title) {
+			issues = append(issues, prefix+".title must be non-empty and trimmed")
+			corrections.Add("title", "Provide a concise, nonblank, trimmed title grounded in the supplied scene transcript.", record)
+		}
+		if strings.TrimSpace(scene.Summary) == "" || scene.Summary != strings.TrimSpace(scene.Summary) {
+			issues = append(issues, prefix+".summary must be non-empty and trimmed")
+			corrections.Add("summary", "Provide a concise, nonblank, trimmed summary grounded in the supplied scene transcript.", record)
+		}
+		if strings.TrimSpace(scene.SourceRef.SourceID) == "" || scene.SourceRef.SourceID != strings.TrimSpace(scene.SourceRef.SourceID) || scene.SourceRef.StartUnitID <= 0 || scene.SourceRef.EndUnitID <= 0 {
+			issues = append(issues, prefix+".source_ref must have a trimmed source ID and positive unit IDs")
+			corrections.Add("scene", "Return exactly one scene description for the supplied extraction chunk.", record)
+		}
+	}
+	return issues, corrections
+}
+
 func ValidKind(value dnd.SceneKind) bool {
 	switch value {
 	case dnd.SceneKindCombat, dnd.SceneKindNarrative, dnd.SceneKindRecap, dnd.SceneKindMeta:

internal/modules/dnd/validate/spells/catalog/validator.go

@@ -5,9 +5,11 @@ import (
 	"fmt"
 	"strings"
 
+	"gitea.maximumdirect.net/eric/notarius/internal/core/source"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared/diagnostics"
 	spellcatalog "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/spells/catalog"
 	spellshape "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/validate/spells/shape"
 )
@@ -15,9 +17,7 @@ import (
 const (
 	Key        = "extract/dnd/spells/catalog"
 	ReasonCode = "unknown_spell"
-	maxIssues             = 20
-	maxDisplayedNameRunes = 128
-	maxMessageBytes       = 4096
+	policy     = "dnd.spells.validator.catalog.v2"
 )
 
 type Options struct{}
@@ -54,7 +54,10 @@ func (v *Validator) CheckpointFingerprints() []pipeline.CheckpointFingerprint {
 	if v == nil {
 		return nil
 	}
-	return []pipeline.CheckpointFingerprint{{Name: "effective_catalog", Value: v.catalog.Digest()}}
+	return []pipeline.CheckpointFingerprint{
+		{Name: "policy", Value: policy},
+		{Name: "effective_catalog", Value: v.catalog.Digest()},
+	}
 }
 
 func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationRequest[dnd.SpellList]) (contracts.ValidationResult, error) {
@@ -69,7 +72,7 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 			continue
 		}
 		if _, ok := v.catalog.Lookup(name); !ok {
-			unknown = append(unknown, unknownSpell{index: index, name: name})
+			unknown = append(unknown, unknownSpell{index: index, name: name, caster: spell.Caster, sourceRefs: spell.SourceRefs})
 		}
 	}
 	if len(unknown) == 0 {
@@ -81,40 +84,27 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 type unknownSpell struct {
 	index      int
 	name       string
+	caster     string
+	sourceRefs []source.SourceRef
 }
 
 func rejection(unknown []unknownSpell) contracts.ValidationResult {
-	limit := len(unknown)
-	if limit > maxIssues {
-		limit = maxIssues
+	issues := make([]string, 0, len(unknown))
+	var corrections diagnostics.Corrections
+	for _, item := range unknown {
+		issues = append(issues, fmt.Sprintf("spell_casts[%d].spell %s", item.index, diagnostics.Quote(item.name)))
+		corrections.Add(
+			"recognized-spell",
+			"Use a recognized D&D spell name supported by the transcript, or omit the record when the evidence does not establish a spell cast.",
+			fmt.Sprintf("Affected spell %s by caster %s %s.", diagnostics.Quote(item.name), diagnostics.Quote(strings.TrimSpace(item.caster)), diagnostics.SourceRange(item.sourceRefs)),
+		)
 	}
-	issues := make([]string, 0, limit)
-	for _, item := range unknown[:limit] {
-		issue := fmt.Sprintf("spell_casts[%d].spell %q", item.index, truncateDisplayedName(item.name))
-		candidate := rejectionMessage(append(issues, issue), len(unknown)-len(issues)-1)
-		if len(candidate) > maxMessageBytes {
-			break
+	return contracts.ValidationResult{
+		Approved:           false,
+		ReasonCode:         ReasonCode,
+		Message:            diagnostics.Aggregate("unknown spell names", issues),
+		CorrectionGuidance: corrections.Guidance("Correct every unrecognized spell and return the complete replacement spell-cast list"),
 	}
-		issues = append(issues, issue)
-	}
-	message := rejectionMessage(issues, len(unknown)-len(issues))
-	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: "Use recognized D&D spell names supported by the supplied transcript evidence, and omit any candidate that is not a spell cast."}
-}
-
-func truncateDisplayedName(name string) string {
-	runes := []rune(name)
-	if len(runes) <= maxDisplayedNameRunes {
-		return name
-	}
-	return string(runes[:maxDisplayedNameRunes-1]) + "…"
-}
-
-func rejectionMessage(issues []string, omitted int) string {
-	message := "unknown spell names: " + strings.Join(issues, ", ")
-	if omitted > 0 {
-		message += fmt.Sprintf("; %d additional issue(s) omitted", omitted)
-	}
-	return message
 }
 
 func Spec() pipeline.ValidatorSpec {

internal/modules/dnd/validate/spells/catalog/validator_test.go

@@ -2,11 +2,9 @@ package catalog
 
 import (
 	"context"
-	"fmt"
 	"reflect"
 	"strings"
 	"testing"
-	"unicode/utf8"
 
 	"gitea.maximumdirect.net/eric/notarius/internal/core/source"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
@@ -36,7 +34,7 @@ func TestValidatorCheckpointFingerprintUsesEffectiveCatalogDigest(t *testing.T)
 		t.Fatal(err)
 	}
 	fingerprints := validator.CheckpointFingerprints()
-	if len(fingerprints) != 1 || fingerprints[0].Name != "effective_catalog" || fingerprints[0].Value != validator.catalog.Digest() {
+	if len(fingerprints) != 2 || fingerprints[0].Name != "policy" || fingerprints[0].Value != policy || fingerprints[1].Name != "effective_catalog" || fingerprints[1].Value != validator.catalog.Digest() {
 		t.Fatalf("checkpoint fingerprints = %#v, want effective catalog digest %q", fingerprints, validator.catalog.Digest())
 	}
 }
@@ -60,59 +58,13 @@ func TestValidatorRejectsMultipleUnknownCastsInStableOrder(t *testing.T) {
 	if want := `spell_casts[0].spell "Unknown First", spell_casts[2].spell "Unknown Second"`; !strings.Contains(result.Message, want) {
 		t.Fatalf("message = %q, want %q", result.Message, want)
 	}
-}
-
-func TestValidatorBoundsUnknownCastMessage(t *testing.T) {
-	value := dnd.SpellList{SpellCasts: make([]dnd.SpellCast, 22)}
-	for index := range value.SpellCasts {
-		value.SpellCasts[index] = validCast(fmt.Sprintf("Unknown Spell %02d", index))
-	}
-	validator, err := New(Options{})
-	if err != nil {
-		t.Fatalf("New() error = %v, want nil", err)
-	}
-	result, err := validator.Validate(context.Background(), validationRequest(value))
-	if err != nil {
-		t.Fatalf("Validate() error = %v, want nil", err)
-	}
-	if result.Approved || result.ReasonCode != ReasonCode {
-		t.Fatalf("Validate() = %#v, want unknown-spell rejection", result)
-	}
-	if got := strings.Count(result.Message, "spell_casts["); got != maxIssues {
-		t.Fatalf("message includes %d issues, want %d: %q", got, maxIssues, result.Message)
-	}
-	if !strings.Contains(result.Message, "2 additional issue(s) omitted") || strings.Contains(result.Message, "Unknown Spell 21") {
-		t.Fatalf("message = %q, want bounded diagnostics", result.Message)
+	for _, want := range []string{"Unknown First", "Unknown Second", "source unit 1", "complete replacement"} {
+		if !strings.Contains(result.CorrectionGuidance, want) {
+			t.Fatalf("CorrectionGuidance = %q, want %q", result.CorrectionGuidance, want)
 		}
 	}
-
-func TestValidatorBoundsUnknownSpellNamesAndTotalMessage(t *testing.T) {
-	longName := strings.Repeat("火", maxDisplayedNameRunes+100) + "\n\t"
-	value := dnd.SpellList{SpellCasts: make([]dnd.SpellCast, maxIssues)}
-	for index := range value.SpellCasts {
-		value.SpellCasts[index] = validCast(fmt.Sprintf("%s-%d", longName, index))
-	}
-	validator, err := New(Options{})
-	if err != nil {
-		t.Fatal(err)
-	}
-	result, err := validator.Validate(context.Background(), validationRequest(value))
-	if err != nil {
-		t.Fatal(err)
-	}
-	if result.Approved || len([]byte(result.Message)) > maxMessageBytes || !strings.Contains(result.Message, "…") {
-		t.Fatalf("message length/content = %d/%q, want bounded message with truncation", len([]byte(result.Message)), result.Message)
-	}
-	if !strings.Contains(result.Message, "additional issue(s) omitted") {
-		t.Fatalf("message = %q, want byte-budget omitted count", result.Message)
-	}
-	displayed := strings.Count(result.Message, "spell_casts[")
-	wantOmitted := fmt.Sprintf("%d additional issue(s) omitted", len(value.SpellCasts)-displayed)
-	if !strings.Contains(result.Message, wantOmitted) {
-		t.Fatalf("message = %q, want omitted count %q", result.Message, wantOmitted)
-	}
-	if !utf8.ValidString(result.Message) {
-		t.Fatal("bounded message is not valid UTF-8")
+	if strings.Contains(result.CorrectionGuidance, "spell_casts[") || strings.Contains(result.CorrectionGuidance, ReasonCode) {
+		t.Fatalf("CorrectionGuidance exposed internal diagnostics: %q", result.CorrectionGuidance)
 	}
 }
 

internal/modules/dnd/validate/spells/shape/validator.go

@@ -8,12 +8,13 @@ import (
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared/diagnostics"
 )
 
 const (
 	Key        = "extract/dnd/spells/shape"
 	ReasonCode = "invalid_spell_shape"
-	policy     = "dnd.spells.validator.shape.v1"
+	policy     = "dnd.spells.validator.shape.v2"
 )
 
 type Options struct{}
@@ -31,28 +32,69 @@ func (v *Validator) CheckpointFingerprints() []pipeline.CheckpointFingerprint {
 	return []pipeline.CheckpointFingerprint{{Name: "policy", Value: policy}}
 }
 func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationRequest[dnd.SpellList]) (contracts.ValidationResult, error) {
-	if err := Validate(req.Value); err != nil {
-		return rejection(err.Error()), nil
+	assessment := assess(req.Value)
+	if len(assessment.issues) != 0 {
+		return rejection(assessment.message(), assessment.corrections.Guidance("Correct every rejected spell cast and return the complete replacement list")), nil
 	}
 	return contracts.ValidationResult{Approved: true}, nil
 }
 
 func Validate(value dnd.SpellList) error {
+	assessment := assess(value)
+	if len(assessment.issues) == 0 {
+		return nil
+	}
+	return fmt.Errorf("%s", assessment.message())
+}
+
+type validationAssessment struct {
+	issues      []string
+	corrections diagnostics.Corrections
+}
+
+func assess(value dnd.SpellList) validationAssessment {
+	var assessment validationAssessment
 	if value.SpellCasts == nil {
-		return fmt.Errorf("spell_casts must be present")
+		assessment.issues = append(assessment.issues, "spell_casts must be present")
+		assessment.corrections.Add("list", "Return a `spell_casts` array; use an empty array when the transcript establishes no spell casts.", "")
+		return assessment
 	}
 	for index, spell := range value.SpellCasts {
+		context := spellContext(spell)
 		if strings.TrimSpace(spell.Caster) == "" {
-			return fmt.Errorf("spell_casts[%d].caster must not be empty", index)
+			assessment.issues = append(assessment.issues, fmt.Sprintf("spell_casts[%d].caster must not be empty", index))
+			assessment.corrections.Add("caster", "Provide the contextual caster name for every spell cast.", context)
 		}
 		if strings.TrimSpace(spell.Spell) == "" {
-			return fmt.Errorf("spell_casts[%d].spell must not be empty", index)
+			assessment.issues = append(assessment.issues, fmt.Sprintf("spell_casts[%d].spell must not be empty", index))
+			assessment.corrections.Add("spell", "Provide the transcript-supported spell name for every spell cast.", context)
 		}
 		if len(spell.SourceRefs) == 0 {
-			return fmt.Errorf("spell_casts[%d].source_refs must not be empty", index)
+			assessment.issues = append(assessment.issues, fmt.Sprintf("spell_casts[%d].source_refs must not be empty", index))
+			assessment.corrections.Add("source-refs", "Provide at least one transcript source range that directly supports every spell cast.", context)
 		}
 	}
-	return nil
+	return assessment
+}
+
+func (assessment validationAssessment) message() string {
+	return diagnostics.Aggregate("invalid spell shape", assessment.issues)
+}
+
+func spellContext(spell dnd.SpellCast) string {
+	name := strings.TrimSpace(spell.Spell)
+	if name == "" {
+		name = "blank spell name"
+	} else {
+		name = "spell " + diagnostics.Quote(name)
+	}
+	caster := strings.TrimSpace(spell.Caster)
+	if caster == "" {
+		caster = "blank caster name"
+	} else {
+		caster = "caster " + diagnostics.Quote(caster)
+	}
+	return "Affected cast: " + name + " with " + caster + " " + diagnostics.SourceRange(spell.SourceRefs) + "."
 }
 
 func Spec() pipeline.ValidatorSpec {
@@ -74,6 +116,6 @@ func DecodeOptions(options map[string]any) (Options, error) {
 	return Options{}, nil
 }
 func validateOptions(options map[string]any) error { _, err := DecodeOptions(options); return err }
-func rejection(message string) contracts.ValidationResult {
-	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: "Return a complete spell-cast list with a nonblank spell name and caster plus valid source references for every cast."}
+func rejection(message, guidance string) contracts.ValidationResult {
+	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: guidance}
 }

internal/modules/dnd/validate/spells/shape/validator_test.go

@@ -2,6 +2,7 @@ package shape
 
 import (
 	"context"
+	"strings"
 	"testing"
 
 	"gitea.maximumdirect.net/eric/notarius/internal/core/source"
@@ -54,6 +55,30 @@ func TestValidatorRejectsMissingRequiredSpellFields(t *testing.T) {
 	}
 }
 
+func TestValidatorReportsAllSpellDefectsWithContextualGuidance(t *testing.T) {
+	value := dnd.SpellList{SpellCasts: []dnd.SpellCast{
+		{Caster: "", Spell: "Fire Bolt", SourceRefs: refsAt(4)},
+		{Caster: "Aria", Spell: "", SourceRefs: nil},
+	}}
+	result, err := New(Options{}).Validate(context.Background(), requestWithValue(value))
+	if err != nil || result.Approved {
+		t.Fatalf("Validate() = %#v, %v; want rejection", result, err)
+	}
+	for _, want := range []string{"spell_casts[0].caster", "spell_casts[1].spell", "spell_casts[1].source_refs"} {
+		if !strings.Contains(result.Message, want) {
+			t.Fatalf("Message = %q, want %q", result.Message, want)
+		}
+	}
+	for _, want := range []string{"Fire Bolt", "source unit 4", "Aria", "complete replacement"} {
+		if !strings.Contains(result.CorrectionGuidance, want) {
+			t.Fatalf("CorrectionGuidance = %q, want %q", result.CorrectionGuidance, want)
+		}
+	}
+	if strings.Contains(result.CorrectionGuidance, "spell_casts[") {
+		t.Fatalf("CorrectionGuidance exposed operator path: %q", result.CorrectionGuidance)
+	}
+}
+
 func TestValidatorSpecCheckpointAndRegistration(t *testing.T) {
 	if got := New(Options{}).CheckpointFingerprints(); len(got) != 1 || got[0].Name != "policy" || got[0].Value != policy {
 		t.Fatalf("CheckpointFingerprints() = %#v, want local policy", got)
@@ -77,3 +102,7 @@ func requestWithValue(value dnd.SpellList) contracts.TypedValidationRequest[dnd.
 func validSpellList() dnd.SpellList {
 	return dnd.SpellList{SpellCasts: []dnd.SpellCast{{Caster: "Aria", Spell: "Cure Wounds", SourceRefs: []source.SourceRef{{SourceID: "session", StartUnitID: 1, EndUnitID: 1}}}}}
 }
+
+func refsAt(unitID int) []source.SourceRef {
+	return []source.SourceRef{{SourceID: "session", StartUnitID: unitID, EndUnitID: unitID}}
+}

internal/modules/dnd/validate/spells/source_refs/validator.go

@@ -8,6 +8,7 @@ import (
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared"
 	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared/diagnostics"
 	spellshape "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/validate/spells/shape"
 )
@@ -15,7 +16,7 @@ import (
 const (
 	Key        = "extract/dnd/spells/source_refs"
 	ReasonCode = "invalid_source_refs"
-	policy     = "dnd.spells.validator.source_refs.v2"
+	policy     = "dnd.spells.validator.source_refs.v3"
 )
 
 type Options struct{}
@@ -40,57 +41,35 @@ func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationReq
 		return contracts.ValidationResult{Approved: true}, nil
 	}
 	index := source.NewDocumentIndex(req.Source)
-	var coverage *chunkCoverage
+	var coverage shared.ChunkCoverage
 	if req.Stage == string(pipeline.StageExtract) {
-		coverage = newChunkCoverage(req.Chunk)
+		coverage = shared.NewChunkCoverage(req.Chunk)
 	}
 	issues := make([]string, 0)
+	var corrections diagnostics.Corrections
 	for spellIndex, spell := range req.Value.SpellCasts {
 		for refIndex, ref := range spell.SourceRefs {
+			record := fmt.Sprintf("Affected spell %s by caster %s, citing %s.", diagnostics.Quote(spell.Spell), diagnostics.Quote(spell.Caster), diagnostics.SourceRefRange(ref))
 			if err := index.ValidateRef(ref); err != nil {
 				issues = append(issues, fmt.Sprintf("spell_casts[%d].source_refs[%d]: %s", spellIndex, refIndex, diagnostics.Truncate(err.Error())))
+				corrections.Add("valid-range", "Use positive source range endpoints that occur in the supplied transcript, with the earlier unit first.", record)
 				continue
 			}
-			if coverage != nil && !coverage.contains(req.Source, ref) {
+			if req.Stage == string(pipeline.StageExtract) && !coverage.Contains(index, req.Source, ref) {
 				issues = append(issues, fmt.Sprintf("spell_casts[%d].source_refs[%d]: source reference is outside the current extraction chunk", spellIndex, refIndex))
+				corrections.Add("chunk-range", "Use only source ranges wholly contained in the supplied extraction chunk.", record)
 			}
 		}
 	}
 	if len(issues) > 0 {
-		return rejection(diagnostics.Aggregate("invalid spell source references", issues)), nil
+		return rejection(
+			diagnostics.Aggregate("invalid spell source references", issues),
+			corrections.Guidance("Correct every rejected spell citation and return the complete replacement spell-cast list"),
+		), nil
 	}
 	return contracts.ValidationResult{Approved: true}, nil
 }
 
-type chunkCoverage struct {
-	sourceID string
-	unitIDs  map[int]struct{}
-}
-
-func newChunkCoverage(chunk *source.Chunk) *chunkCoverage {
-	coverage := &chunkCoverage{sourceID: chunk.SourceID, unitIDs: make(map[int]struct{}, len(chunk.Units))}
-	for _, unit := range chunk.Units {
-		coverage.unitIDs[unit.ID] = struct{}{}
-	}
-	return coverage
-}
-
-func (coverage *chunkCoverage) contains(doc *source.SourceDocument, ref source.SourceRef) bool {
-	if coverage == nil || doc == nil || ref.SourceID != coverage.sourceID {
-		return false
-	}
-	start, startOK := source.UnitIndex(doc, ref.StartUnitID)
-	end, endOK := source.UnitIndex(doc, ref.EndUnitID)
-	if !startOK || !endOK || start > end {
-		return false
-	}
-	for position := start; position <= end; position++ {
-		if _, found := coverage.unitIDs[doc.Units[position].ID]; !found {
-			return false
-		}
-	}
-	return true
-}
 func Spec() pipeline.ValidatorSpec {
 	return pipeline.ValidatorSpec{Key: Key, ExecutionClass: contracts.ExecutionClassDeterministic}
 }
@@ -110,6 +89,6 @@ func DecodeOptions(options map[string]any) (Options, error) {
 	return Options{}, nil
 }
 func validateOptions(options map[string]any) error { _, err := DecodeOptions(options); return err }
-func rejection(message string) contracts.ValidationResult {
-	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: "Return spell casts whose source references identify valid transcript ranges within the supplied extraction chunk and directly support the named spell and caster."}
+func rejection(message, guidance string) contracts.ValidationResult {
+	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message, CorrectionGuidance: guidance}
 }

internal/modules/dnd/validate/spells/source_refs/validator_test.go

@@ -33,6 +33,14 @@ func TestValidatorRejectsInvalidSourceRefs(t *testing.T) {
 	if result.ReasonCode != ReasonCode {
 		t.Fatalf("ReasonCode = %q, want %q", result.ReasonCode, ReasonCode)
 	}
+	for _, want := range []string{"Cure Wounds", "Aria", "source unit 99", "complete replacement"} {
+		if !strings.Contains(result.CorrectionGuidance, want) {
+			t.Fatalf("CorrectionGuidance = %q, want %q", result.CorrectionGuidance, want)
+		}
+	}
+	if strings.Contains(result.CorrectionGuidance, "spell_casts[") || strings.Contains(result.CorrectionGuidance, ReasonCode) {
+		t.Fatalf("CorrectionGuidance exposed internal diagnostics: %q", result.CorrectionGuidance)
+	}
 }
 
 func TestValidatorRejectsMissingSourceDocument(t *testing.T) {