Expose run-wide reasoning effort controls

docs/cli.md

@@ -41,14 +41,21 @@ pipeline ID and **--input** are required.
 | **--only lane-a,lane-b** | Run only the selected comma-separated artifact lanes when that selection is valid for the configured pipeline. |
 | **--llm-profile id** | Override effective LLM-capable module bindings with one configured profile. |
 | **--session-id id** | Supply a non-empty prompt session identifier to LLM-backed module calls. |
+| **--reasoning-effort value** | Replace the selected PromptKit profile's reasoning effort for every LLM-backed call in this run. The value must be non-empty and the flag may be specified only once. |
+| **--clear-reasoning-effort** | Clear reasoning effort inherited from the selected PromptKit profile for every LLM-backed call in this run. |
 | **--reference selector=path** | Add or replace a file reference binding. Repeatable. |
 | **--without-reference selector** | Remove a configured optional reference binding. Repeatable. |
 
 **--chunk_cache** accepts only **auto**, **bypass**, or **refresh**.
 **--debug-dir**, **--output-dir**, **--session-id**, and
-**--recompute-step** reject explicit empty values. **--recompute-step**
+**--reasoning-effort**, and **--recompute-step** reject explicit empty values.
-requires **--resume**; checkpoint requirements and reuse behavior are
+**--reasoning-effort** and **--clear-reasoning-effort** are mutually exclusive.
-documented in [Operations](operations.md).
+When neither is present, reasoning effort comes from the selected PromptKit
+profile. These controls apply to the shared run client, including retries and
+LLM-backed validators, and do not modify configuration or profile files.
+Persistent reasoning settings remain a PromptKit profile concern.
+**--recompute-step** requires **--resume**; checkpoint requirements and reuse
+behavior are documented in [Operations](operations.md).
 
 ### Reference selectors
 

docs/internal/cli.md

@@ -63,9 +63,13 @@ the adapter mechanics remain in [LLM Runtime](llm.md).
 
 The factory also accepts `LLMRuntimeOverrides`, whose reasoning pointer
 preserves inherit, replace, and clear states across the composition boundary.
-Run orchestration currently passes the zero value, so production execution
+Run orchestration constructs this value from the mutually exclusive
-inherits the selected PromptKit profile. No command flag or Notarius
+`--reasoning-effort` and `--clear-reasoning-effort` controls. Absence preserves
-configuration field exposes this internal override yet.
+a nil pointer, replacement is trimmed, and clear uses a non-nil empty string.
+The same override reaches the one shared production client, checkpoint
+identity, and debug invocation metadata. Persistent reasoning configuration
+remains owned by PromptKit profiles; Notarius configuration has no reasoning
+field.
 
 ## Run Orchestration
 

docs/internal/llm.md

@@ -40,8 +40,11 @@ Client construction may also receive a run-wide reasoning-effort override from
 the CLI factory boundary. The adapter copies the caller-owned pointer and
 creates a fresh PromptKit execution override for each request: a nil pointer
 inherits the selected profile, a non-empty value replaces it, and an empty
-value clears inherited reasoning. Ordinary CLI execution currently supplies no
+value clears inherited reasoning. The CLI's mutually exclusive
-override, so profile behavior remains unchanged.
+`--reasoning-effort` and `--clear-reasoning-effort` controls select those
+states. With neither flag, profile behavior remains unchanged. Because
+production constructs one shared client, the selected state applies uniformly
+to module calls, retries, and LLM-backed validators for the whole run.
 
 An empty request profile lets the prompt select its configured default. The CLI
 prepares every explicitly selected binding profile before a run begins, so a

docs/operations.md

@@ -121,6 +121,9 @@ provenance, the effective PromptKit profile-source fingerprint, and
 prepared-component fingerprints. Changing profile content causes a cold miss
 even when its profile ID is unchanged. A changed identity produces a cold miss;
 Notarius does not migrate, rewrite, or delete older checkpoint directories.
+Reasoning-effort inheritance, replacement, and explicit clearing are distinct
+runtime identities, so checkpoints created under one state are not reused by
+either of the others.
 
 Checkpoint state is confined below an identity-specific path:
 
@@ -180,7 +183,9 @@ warning, checkpoint, chunk-plan, and terminal reporting artifacts. The trace
 contains allowlisted application diagnostic records and can include source or
 derived application data. Neither surface is a cache input. Do not treat a
 debug bundle as safe to share merely because its configuration summary is
-redacted.
+redacted. Invocation metadata omits reasoning effort when it is inherited,
+records the replacement value when one is supplied, and records an empty value
+when inherited reasoning was explicitly cleared.
 
 Notarius never creates debug state without an explicit request and never
 automatically deletes a requested bundle. If allocation succeeds, the command
@@ -209,7 +214,10 @@ or automatic cleanup command.
 ## Operational Limits
 
 Provider execution settings and the generation timeout come from the selected
-PromptKit profile. PromptKit v0.1.0 does not add a provider retry loop;
+PromptKit profile. The invocation-only **--reasoning-effort** and
+**--clear-reasoning-effort** controls may replace or clear that profile setting
+for all LLM-backed calls in one run without changing the profile. PromptKit
+v0.2.0 does not add a provider retry loop;
 Notarius binding retries rerun the complete module operation and validation
 chain as defined by [module bindings](config.md#module-bindings-and-validators).
 

internal/cli/run.go

@@ -142,13 +142,16 @@ func runPipelineCommand(args []string, stdout, stderr io.Writer, opts Options) i
 	debug := fs.Bool("debug", false, "write a debug bundle")
 	debugDir := fs.String("debug-dir", "", "debug bundle directory")
 	llmProfile := fs.String("llm-profile", "", "LLM profile override")
+	reasoningEffort := singleValueFlag{name: "--reasoning-effort"}
+	clearReasoningEffort := fs.Bool("clear-reasoning-effort", false, "clear the LLM profile reasoning effort")
 	resume := fs.Bool("resume", false, "reuse compatible recorded checkpoints")
-	recomputeStep := singleValueFlag{}
+	recomputeStep := singleValueFlag{name: "--recompute-step"}
 	chunkCache := chunkCacheFlag{}
 	sessionID := sessionIDFlag{}
 	referenceFlags := stringListFlag{}
 	withoutReferenceFlags := stringListFlag{}
 	fs.Var(&sessionID, "session-id", "prompt session identifier")
+	fs.Var(&reasoningEffort, "reasoning-effort", "reasoning effort override")
 	fs.Var(&chunkCache, "chunk_cache", "chunk plan cache mode: auto, bypass, or refresh")
 	fs.Var(&referenceFlags, "reference", "reference binding, as slot=path, chunk.slot=path, merge.slot=path, lane.slot=path, lane.extract.slot=path, lane.merge.slot=path, or lane.normalize.slot=path")
 	fs.Var(&withoutReferenceFlags, "without-reference", "unbind a reference, using the same selector forms as --reference")
@@ -194,6 +197,22 @@ func runPipelineCommand(args []string, stdout, stderr io.Writer, opts Options) i
 		fmt.Fprintln(stderr, "notarius: --session-id must not be empty")
 		return 2
 	}
+	if reasoningEffort.set && *clearReasoningEffort {
+		fmt.Fprintln(stderr, "notarius: --reasoning-effort cannot be combined with --clear-reasoning-effort")
+		return 2
+	}
+	if reasoningEffort.set && strings.TrimSpace(reasoningEffort.value) == "" {
+		fmt.Fprintln(stderr, "notarius: --reasoning-effort must not be empty")
+		return 2
+	}
+	runtimeOverrides := LLMRuntimeOverrides{}
+	if reasoningEffort.set {
+		value := strings.TrimSpace(reasoningEffort.value)
+		runtimeOverrides.ReasoningEffort = &value
+	} else if *clearReasoningEffort {
+		value := ""
+		runtimeOverrides.ReasoningEffort = &value
+	}
 	only, err := parseOnly(*onlyRaw)
 	if err != nil {
 		fmt.Fprintf(stderr, "notarius: %v\n", err)
@@ -291,6 +310,7 @@ func runPipelineCommand(args []string, stdout, stderr io.Writer, opts Options) i
 		ConfigSource:            configSource(*configPath),
 		OnlyLanes:               append([]string(nil), only...),
 		ChunkCacheOverride:      chunkCache.explicitValue(),
+		ReasoningEffortOverride: runtimeOverrides.ReasoningEffort,
 		Resume:                  *resume,
 		RecomputeStep:           strings.TrimSpace(recomputeStep.value),
 		RunID:                   runID,
@@ -368,7 +388,7 @@ func runPipelineCommand(args []string, stdout, stderr io.Writer, opts Options) i
 	if len(profileIDs) == 1 {
 		factoryProfileID = profileIDs[0]
 	}
-	llmClient, llmProfiles, err := opts.LLMClientFactory(ctx, effective.Config, factoryProfileID, LLMRuntimeOverrides{})
+	llmClient, llmProfiles, err := opts.LLMClientFactory(ctx, effective.Config, factoryProfileID, runtimeOverrides)
 	if err != nil {
 		return failPipelineCommand(stderr, commandState, terminalWriter, fmt.Errorf("create LLM client for profile %q: %w", factoryProfileID, err))
 	}
@@ -392,7 +412,7 @@ func runPipelineCommand(args []string, stdout, stderr io.Writer, opts Options) i
 	if err != nil {
 		return failPipelineCommand(stderr, commandState, terminalWriter, err)
 	}
-	checkpointRecorder, checkpointLoader, err := checkpointHandlersForRun(effective.Config.Cache.Checkpoints, opts, effective.ResolvedPipeline, prepared.CheckpointFingerprints(), llmFingerprints, rawInput, only, llmProfiles, strings.TrimSpace(*llmProfile), strings.TrimSpace(sessionID.value), *resume)
+	checkpointRecorder, checkpointLoader, err := checkpointHandlersForRun(effective.Config.Cache.Checkpoints, opts, effective.ResolvedPipeline, prepared.CheckpointFingerprints(), llmFingerprints, rawInput, only, llmProfiles, strings.TrimSpace(*llmProfile), strings.TrimSpace(sessionID.value), runtimeOverrides, *resume)
 	if err != nil {
 		return failPipelineCommand(stderr, commandState, terminalWriter, err)
 	}
@@ -499,6 +519,7 @@ func checkpointHandlersForRun(
 	llmProfiles []artifacts.LLMProfileManifest,
 	llmProfileOverride string,
 	sessionID string,
+	runtimeOverrides LLMRuntimeOverrides,
 	resume bool,
 ) (pipeline.CheckpointRecorder, pipeline.CheckpointLoader, error) {
 	if !settings.Enabled {
@@ -512,7 +533,7 @@ func checkpointHandlersForRun(
 		InputKey:         resolved.Input.Module,
 		RawInputDigest:   rawInputDigest(rawInput),
 		SelectedLanes:    only,
-		RuntimeOverrides: runtimeOverrideFingerprints(llmProfileOverride, sessionID),
+		RuntimeOverrides: runtimeOverrideFingerprints(llmProfileOverride, sessionID, runtimeOverrides),
 		References:       pipeline.ReferenceProvenance(resolved),
 		ProvenanceFingerprints: combineCheckpointFingerprints(
 			llmProfileFingerprints(llmProfiles),
@@ -673,7 +694,7 @@ func rawInputDigest(data []byte) string {
 	return "sha256:" + hex.EncodeToString(sum[:])
 }
 
-func runtimeOverrideFingerprints(llmProfileOverride string, sessionID string) []checkpoint.Fingerprint {
+func runtimeOverrideFingerprints(llmProfileOverride string, sessionID string, runtimeOverrides LLMRuntimeOverrides) []checkpoint.Fingerprint {
 	var values []checkpoint.Fingerprint
 	if strings.TrimSpace(llmProfileOverride) != "" {
 		values = append(values, checkpoint.Fingerprint{Name: "llm_profile_override", Value: strings.TrimSpace(llmProfileOverride)})
@@ -681,6 +702,13 @@ func runtimeOverrideFingerprints(llmProfileOverride string, sessionID string) []
 	if strings.TrimSpace(sessionID) != "" {
 		values = append(values, checkpoint.Fingerprint{Name: "session_id", Value: strings.TrimSpace(sessionID)})
 	}
+	if runtimeOverrides.ReasoningEffort != nil {
+		value := strings.TrimSpace(*runtimeOverrides.ReasoningEffort)
+		if value == "" {
+			value = "<cleared>"
+		}
+		values = append(values, checkpoint.Fingerprint{Name: "reasoning_effort_override", Value: value})
+	}
 	return values
 }
 
@@ -837,7 +865,7 @@ func reorderRunArgs(args []string) []string {
 
 func runFlagTakesValue(arg string) bool {
 	switch arg {
-	case "--config", "--input", "--only", "--output-dir", "--debug-dir", "--llm-profile", "--session-id", "--chunk_cache", "--reference", "--without-reference", "--recompute-step":
+	case "--config", "--input", "--only", "--output-dir", "--debug-dir", "--llm-profile", "--session-id", "--reasoning-effort", "--chunk_cache", "--reference", "--without-reference", "--recompute-step":
 		return true
 	default:
 		return false
@@ -897,11 +925,11 @@ func chunkPlanStoreForRun(cfg config.ChunkPlanCacheConfig, opts Options) (pipeli
 
 func validateRunFlagValues(args []string) error {
 	for i, arg := range args {
-		if arg != "--session-id" {
+		if arg != "--session-id" && arg != "--reasoning-effort" {
 			continue
 		}
 		if i+1 >= len(args) || strings.HasPrefix(args[i+1], "-") {
-			return fmt.Errorf("flag needs an argument: --session-id")
+			return fmt.Errorf("flag needs an argument: %s", arg)
 		}
 	}
 	return nil
@@ -1185,6 +1213,7 @@ type sessionIDFlag struct {
 }
 
 type singleValueFlag struct {
+	name  string
 	value string
 	set   bool
 }
@@ -1198,7 +1227,7 @@ func (flag *singleValueFlag) String() string {
 
 func (flag *singleValueFlag) Set(value string) error {
 	if flag.set {
-		return fmt.Errorf("--recompute-step may be specified only once")
+		return fmt.Errorf("%s may be specified only once", flag.name)
 	}
 	flag.value = value
 	flag.set = true

internal/cli/run_contract_test.go

@@ -12,6 +12,7 @@ import (
 
 	"gitea.maximumdirect.net/eric/notarius/internal/core/artifacts"
 	"gitea.maximumdirect.net/eric/notarius/internal/core/config"
+	"gitea.maximumdirect.net/eric/notarius/internal/framework/checkpoint"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
 )
@@ -319,6 +320,129 @@ func TestRunLLMProfileOverrideAndValidationUseInjectedBoundaries(t *testing.T) {
 	})
 }
 
+func TestRunReasoningEffortOverrideReachesFactory(t *testing.T) {
+	tests := []struct {
+		name      string
+		flags     []string
+		wantValue string
+		wantSet   bool
+	}{
+		{name: "inherit"},
+		{name: "replace", flags: []string{"--reasoning-effort", " focused "}, wantValue: "focused", wantSet: true},
+		{name: "clear", flags: []string{"--clear-reasoning-effort"}, wantSet: true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			roots := newStateTestRoots(t)
+			opts := newStateTestHarness().options()
+			var got []LLMRuntimeOverrides
+			opts.LLMClientFactory = func(_ context.Context, _ config.Config, _ string, overrides LLMRuntimeOverrides) (contracts.StructuredLLMClient, []artifacts.LLMProfileManifest, error) {
+				got = append(got, overrides)
+				return nil, nil, nil
+			}
+			args := append([]string{"run", "sample", "--config", roots.config, "--input", roots.input, "--chunk_cache", "bypass"}, tt.flags...)
+			var stdout, stderr bytes.Buffer
+			if code := RunWithOptions(args, &stdout, &stderr, opts); code != 0 || stderr.Len() != 0 {
+				t.Fatalf("code=%d stdout=%q stderr=%q", code, stdout.String(), stderr.String())
+			}
+			if len(got) != 1 {
+				t.Fatalf("factory overrides = %#v, want one call", got)
+			}
+			if !tt.wantSet {
+				if got[0].ReasoningEffort != nil {
+					t.Fatalf("reasoning effort = %q, want inherit", *got[0].ReasoningEffort)
+				}
+				return
+			}
+			if got[0].ReasoningEffort == nil || *got[0].ReasoningEffort != tt.wantValue {
+				t.Fatalf("reasoning effort = %#v, want %q", got[0].ReasoningEffort, tt.wantValue)
+			}
+		})
+	}
+}
+
+func TestRunReasoningEffortOverrideRejectsInvalidSyntax(t *testing.T) {
+	tests := []struct {
+		name      string
+		flags     []string
+		wantError string
+	}{
+		{
+			name:      "mutually exclusive controls",
+			flags:     []string{"--reasoning-effort", "focused", "--clear-reasoning-effort"},
+			wantError: "cannot be combined",
+		},
+		{
+			name:      "empty replacement",
+			flags:     []string{"--reasoning-effort", "  "},
+			wantError: "must not be empty",
+		},
+		{
+			name:      "duplicate replacement",
+			flags:     []string{"--reasoning-effort", "low", "--reasoning-effort", "high"},
+			wantError: "may be specified only once",
+		},
+		{
+			name:      "missing replacement",
+			flags:     []string{"--reasoning-effort"},
+			wantError: "flag needs an argument",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			roots := newStateTestRoots(t)
+			args := append([]string{"run", "sample", "--config", roots.config, "--input", roots.input}, tt.flags...)
+			var stdout, stderr bytes.Buffer
+			code := RunWithOptions(args, &stdout, &stderr, newStateTestHarness().options())
+			if code != 2 || stdout.Len() != 0 || !strings.Contains(stderr.String(), tt.wantError) {
+				t.Fatalf("code=%d stdout=%q stderr=%q", code, stdout.String(), stderr.String())
+			}
+			assertNoRunState(t, roots)
+		})
+	}
+}
+
+func TestReasoningEffortOverrideSeparatesCheckpointIdentities(t *testing.T) {
+	replacement := " focused "
+	cleared := ""
+	states := []struct {
+		name      string
+		overrides LLMRuntimeOverrides
+		wantValue string
+		wantSet   bool
+	}{
+		{name: "inherit"},
+		{name: "replace", overrides: LLMRuntimeOverrides{ReasoningEffort: &replacement}, wantValue: "focused", wantSet: true},
+		{name: "clear", overrides: LLMRuntimeOverrides{ReasoningEffort: &cleared}, wantValue: "<cleared>", wantSet: true},
+	}
+	digests := make(map[string]string, len(states))
+	for _, state := range states {
+		fingerprints := runtimeOverrideFingerprints("", "", state.overrides)
+		var value string
+		var found bool
+		for _, fingerprint := range fingerprints {
+			if fingerprint.Name == "reasoning_effort_override" {
+				value, found = fingerprint.Value, true
+			}
+		}
+		if found != state.wantSet || (found && value != state.wantValue) {
+			t.Fatalf("%s fingerprint found=%t value=%q, want found=%t value=%q", state.name, found, value, state.wantSet, state.wantValue)
+		}
+		identity, err := checkpoint.NewIdentity(checkpoint.IdentityInput{
+			Pipeline:         pipeline.ResolvedPipeline{ID: "sample", Digest: "sha256:pipeline", Input: pipeline.Binding("test/input")},
+			RawInputDigest:   "sha256:input",
+			RuntimeOverrides: fingerprints,
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+		digests[state.name] = identity.Digest
+	}
+	if digests["inherit"] == digests["replace"] || digests["inherit"] == digests["clear"] || digests["replace"] == digests["clear"] {
+		t.Fatalf("checkpoint identity digests are not distinct: %#v", digests)
+	}
+}
+
 func TestEffectiveLLMProfileIDsAreSortedDeduplicatedAndLLMOnly(t *testing.T) {
 	resolved := pipeline.ResolvedPipeline{
 		Input: pipeline.ModuleBinding{LLMProfile: "input-profile"},

internal/cli/spell_catalog_identity_contract_test.go

@@ -216,7 +216,7 @@ func TestChangedSemanticSpellCatalogFingerprintCannotResumeRecordedCheckpoint(t
 	fingerprints := prepared.CheckpointFingerprints()
 	llmFingerprints := []checkpoint.Fingerprint{{Name: "promptkit_profile_source", Value: "sha256:profile-source-one"}}
 	settings := config.CheckpointCacheConfig{Enabled: true, Directory: t.TempDir()}
-	recorder, _, err := checkpointHandlersForRun(settings, Options{}, materialized, fingerprints, llmFingerprints, []byte("same input"), nil, nil, "", "", false)
+	recorder, _, err := checkpointHandlersForRun(settings, Options{}, materialized, fingerprints, llmFingerprints, []byte("same input"), nil, nil, "", "", LLMRuntimeOverrides{}, false)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -242,7 +242,7 @@ func TestChangedSemanticSpellCatalogFingerprintCannotResumeRecordedCheckpoint(t
 		t.Fatal(err)
 	}
 
-	_, sameLoader, err := checkpointHandlersForRun(settings, Options{}, materialized, fingerprints, llmFingerprints, []byte("same input"), nil, nil, "", "", true)
+	_, sameLoader, err := checkpointHandlersForRun(settings, Options{}, materialized, fingerprints, llmFingerprints, []byte("same input"), nil, nil, "", "", LLMRuntimeOverrides{}, true)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -254,7 +254,7 @@ func TestChangedSemanticSpellCatalogFingerprintCannotResumeRecordedCheckpoint(t
 	}
 	changed := replaceCheckpointFingerprintValue(t, fingerprints, normalizeSpellCatalogFingerprintName(), "sha256:changed-effective-catalog")
 	assertOnlyCheckpointFingerprintChanged(t, fingerprints, changed, normalizeSpellCatalogFingerprintName())
-	_, changedLoader, err := checkpointHandlersForRun(settings, Options{}, materialized, changed, llmFingerprints, []byte("same input"), nil, nil, "", "", true)
+	_, changedLoader, err := checkpointHandlersForRun(settings, Options{}, materialized, changed, llmFingerprints, []byte("same input"), nil, nil, "", "", LLMRuntimeOverrides{}, true)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -266,7 +266,7 @@ func TestChangedSemanticSpellCatalogFingerprintCannotResumeRecordedCheckpoint(t
 	}
 	changedMapping := replaceCheckpointFingerprintValue(t, fingerprints, extractSpellMappingFingerprintName(), "dnd.spells.extract_mapping.v3")
 	assertOnlyCheckpointFingerprintChanged(t, fingerprints, changedMapping, extractSpellMappingFingerprintName())
-	_, mappingLoader, err := checkpointHandlersForRun(settings, Options{}, materialized, changedMapping, llmFingerprints, []byte("same input"), nil, nil, "", "", true)
+	_, mappingLoader, err := checkpointHandlersForRun(settings, Options{}, materialized, changedMapping, llmFingerprints, []byte("same input"), nil, nil, "", "", LLMRuntimeOverrides{}, true)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -275,7 +275,7 @@ func TestChangedSemanticSpellCatalogFingerprintCannotResumeRecordedCheckpoint(t
 	}
 
 	changedLLMFingerprints := []checkpoint.Fingerprint{{Name: "promptkit_profile_source", Value: "sha256:profile-source-two"}}
-	_, profileLoader, err := checkpointHandlersForRun(settings, Options{}, materialized, fingerprints, changedLLMFingerprints, []byte("same input"), nil, nil, "", "", true)
+	_, profileLoader, err := checkpointHandlersForRun(settings, Options{}, materialized, fingerprints, changedLLMFingerprints, []byte("same input"), nil, nil, "", "", LLMRuntimeOverrides{}, true)
 	if err != nil {
 		t.Fatal(err)
 	}

internal/core/debugbundle/bundle_test.go

@@ -2,6 +2,7 @@ package debugbundle
 
 import (
 	"bytes"
+	"encoding/json"
 	"os"
 	"path/filepath"
 	"strings"
@@ -137,6 +138,47 @@ func TestSummaryWriterWritesEverySummaryArtifact(t *testing.T) {
 		}
 	}
 }
+
+func TestWriteInvocationPreservesReasoningEffortOverrideStates(t *testing.T) {
+	replacement := "focused"
+	cleared := ""
+	tests := []struct {
+		name      string
+		override  *string
+		wantValue string
+		wantSet   bool
+	}{
+		{name: "inherit"},
+		{name: "replace", override: &replacement, wantValue: "focused", wantSet: true},
+		{name: "clear", override: &cleared, wantSet: true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			bundle, err := Allocate(t.TempDir(), testBundleRunID, time.Unix(0, 42))
+			if err != nil {
+				t.Fatal(err)
+			}
+			if err := bundle.Summary().WriteInvocation(Invocation{
+				Operation:               "run",
+				ReasoningEffortOverride: tt.override,
+			}); err != nil {
+				t.Fatal(err)
+			}
+			data, err := os.ReadFile(filepath.Join(bundle.SummaryRoot(), ArtifactInvocationMetadata))
+			if err != nil {
+				t.Fatal(err)
+			}
+			var payload map[string]any
+			if err := json.Unmarshal(data, &payload); err != nil {
+				t.Fatal(err)
+			}
+			value, found := payload["reasoning_effort_override"]
+			if found != tt.wantSet || (found && value != tt.wantValue) {
+				t.Fatalf("reasoning override found=%t value=%#v, want found=%t value=%q; JSON=%s", found, value, tt.wantSet, tt.wantValue, data)
+			}
+		})
+	}
+}
 func TestSummaryWriterInternalWritesConfineArtifacts(t *testing.T) {
 	bundle, err := Allocate(t.TempDir(), testBundleRunID, time.Unix(0, 42))
 	if err != nil {

internal/core/debugbundle/summary.go

@@ -39,6 +39,7 @@ type Invocation struct {
 	ConfigSource            string    `json:"config_source,omitempty"`
 	OnlyLanes               []string  `json:"only_lanes,omitempty"`
 	ChunkCacheOverride      string    `json:"chunk_cache_override,omitempty"`
+	ReasoningEffortOverride *string   `json:"reasoning_effort_override,omitempty"`
 	RunID                   string    `json:"run_id"`
 	StartedAt               time.Time `json:"started_at"`
 }
@@ -68,6 +69,10 @@ func (w *SummaryWriter) WriteInvocation(payload Invocation) error {
 	if payload.StartedAt.IsZero() {
 		payload.StartedAt = w.createdAt
 	}
+	if payload.ReasoningEffortOverride != nil {
+		value := *payload.ReasoningEffortOverride
+		payload.ReasoningEffortOverride = &value
+	}
 	return w.writeJSON(ArtifactInvocationMetadata, payload)
 }
 func (w *SummaryWriter) WriteRedactedEffectiveConfig(payload RedactedSummaryPayload) error {