Plan simpler D&D scene chunking
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docs/roadmap/implementation.md
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docs/roadmap/implementation.md
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# Implementation Plan: Minimal D&D Scene Chunking
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Status: Ready for implementation
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This plan implements the target state in
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[Minimal D&D Scene Chunking](minimal-dnd-scene-chunking.md). Complete the
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stages in order. The feature roadmap owns product intent and boundary policy;
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this document owns implementation sequence and acceptance criteria.
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## Decisions And Constraints
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- Keep the production module key `dnd/scenes`, prompt ID `dnd.scenes`, private
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response-schema key and ID, schema filename, schema name, and schema version
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`v1`. This application is pre-release, so update the private v1 contract in
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place rather than adding a second prompt or response decoder.
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- The model response contains only a required, non-empty `scenes` array whose
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objects contain exactly `start_unit_id` and `end_unit_id`.
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- A newly generated D&D scene plan has no plan-level or range-level
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annotations and no model-derived warnings. Do not retain deprecated fields
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internally, hide them in metadata, or translate them into another free-form
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output.
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- Preserve the shared D&D prompt assets, prompt message layout, reference
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slots, configured profile behavior, module registration, structured LLM
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boundary, manifest prompt/schema metadata, and deterministic coverage rules.
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- Do not change the generic `source.ChunkPlan`, `source.ChunkRange`, materialized
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chunk, or `source/chunk-map` contracts. Empty annotation maps are already
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valid generic behavior.
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- Invalidate all pre-change canonical chunk-plan records once by changing the
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cache record schema from `notarius.chunk-plan.v1` to
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`notarius.chunk-plan.v2`. This is intentionally a global, recoverable
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pre-release cache transition. Do not compare prompt hashes, response-schema
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hashes, chunker keys, profiles, references, or annotations during lookup;
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after the version transition, ADR-0005's source-digest-only reuse policy
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remains unchanged.
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- Follow the testing policy: protect the private schema and observable plan
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invariants, remove obsolete annotation tests, and avoid exact prompt-text,
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prompt-length, prompt-hash, or message-count change detectors. Default tests
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remain offline and must not call a live or paid model.
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- Do not implement scene-aware combat skipping, ordered dependencies, new
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validators, repair calls, semantic post-processing, or changes to the
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`dnd/scene-descriptions` lane.
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## Stage 1: Replace The Scene Chunker With Its Minimal Contract
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### Goal
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Make every newly generated `dnd/scenes` plan depend only on the model-proposed
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scene endpoints and contain no D&D-specific annotations or warnings.
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### Production changes
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1. Simplify
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`internal/modules/dnd/chunk/scenes/assets/schemas/dnd_scenes.v1.json` in
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place:
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- keep the existing JSON Schema draft and `$id`;
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- retain one top-level object with `additionalProperties: false`;
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- make `scenes` the sole required and permitted top-level field;
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- retain `type: array` and `minItems: 1`; and
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- define each item as a closed object requiring only positive integer
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`start_unit_id` and `end_unit_id`.
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2. Rewrite the scene-specific content in
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`internal/modules/dnd/chunk/scenes/assets/prompts/task.md` and
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`instructions.md`:
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- retain the feature roadmap's definition of a scene, positive and negative
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boundary guidance, preference for fewer coherent scenes, and full ordered
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coverage requirement;
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- ask only for inclusive source-unit endpoints;
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- continue to forbid gaps, overlaps, reordering, final chunk IDs, and chunk
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indexes; and
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- remove every request or definition for titles, modes, participants,
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summaries, boundary notes, confidence, and caveats.
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Leave `dnd.scenes.yaml` and the shared prompt assets unchanged. Their
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existing message structure, cache controls, inputs, prompt identity, profile,
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and schema path remain authoritative.
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3. Reduce the private DTOs in
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`internal/modules/dnd/chunk/scenes/model.go`:
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- `chunkResponse` contains only `Scenes []sceneResponse`;
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- `sceneResponse` contains only the two existing `shared.UnitRef` endpoint
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fields; and
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- delete `normalizedScene` rather than preserving a second endpoints-only
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representation.
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4. Simplify `internal/modules/dnd/chunk/scenes/chunker.go`:
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- remove `annotationNamespace`, annotation JSON encoding, caveat-to-warning
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conversion, semantic field trimming, participant copying, enum helpers,
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and imports used only by those behaviors;
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- keep request validation, source-document validation, prompt inputs,
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response decoding, module registration, reference declarations, and
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manifest metadata unchanged;
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- have `Plan` pass the minimal response to `planFromResponse` and return the
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resulting plan with no warnings;
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- have `planFromResponse` resolve both `shared.UnitRef` endpoints through
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`shared.ResolveUnitID`, validate them against a precomputed map of source
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unit ID to document position, enforce first-to-last contiguous coverage,
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and append ranges containing only `StartUnitID` and `EndUnitID`; and
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- return a plan containing only the source digest and ranges. Treat nil and
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zero-length annotation maps as equivalent absence; do not allocate empty
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maps solely for presentation.
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5. Preserve validation by document position. Do not compare endpoint IDs
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numerically or assume that adjacent document units have consecutive IDs.
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### Focused tests
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Update the existing tests instead of layering parallel coverage onto obsolete
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cases:
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- In `schema_test.go`, make the valid fixture use only the minimal fields.
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Retain schema identity/loading and defensive-copy coverage. Verify a valid
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minimal response, a missing or empty `scenes` array, non-positive or
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non-integer endpoints, unknown top-level fields, and unknown scene fields.
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A removed legacy field is sufficient to exercise scene-level unknown-field
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rejection; do not enumerate every removed field.
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- In `chunker_test.go`, replace
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`TestPlanReturnsSceneRangesAndAnnotationsFromStructuredOutput` with a
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behavior-level test that verifies the structured request, exact resolved
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ranges, source digest, absent plan/range annotations, and absent warnings.
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Remove the whitespace-caveat and annotation-defensive-copy tests and remove
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obsolete semantic-field cases from the malformed-output table.
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- Retain request, reference-input, legacy-roster mapping, LLM error, module
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registration, manifest metadata, missing/empty scene, unknown endpoint,
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reversed endpoint, gap, overlap, and incomplete-coverage behavior.
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- Add one planner case whose source units have positive IDs in a nonnumeric
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document order, such as `10, 3, 20`. Prove that valid ranges follow document
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order and that reversal is judged by positions rather than numeric values.
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- Simplify test builders such as `scene`, `validSceneResponse`, and schema
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fixtures so they construct only endpoints.
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- Keep the prompt preparation and diagnostics tests in
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`scriptorium_assets_test.go`. Preparation through the real embedded assets is
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sufficient; do not assert the exact wording or hash of the rewritten
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scene-specific prompt.
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### Stage validation
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Run:
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```sh
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gofmt -w internal/modules/dnd/chunk/scenes/*.go
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go test -count=1 ./internal/modules/dnd/chunk/scenes
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git diff --check
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```
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Stage 1 is complete when the focused package accepts the minimal structured
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response, rejects malformed ranges, returns annotation-free and warning-free
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plans, and contains no production references to the removed response fields.
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## Stage 2: Retire Old Cached Plans And Align Maintained Contracts
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### Goal
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Ensure a pre-change cached plan cannot reintroduce removed D&D annotations,
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while preserving generic annotations and source-addressed plan reuse for all
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new records.
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### Cache compatibility changes
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1. Change `pipeline.ChunkPlanSchemaVersion` in
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`internal/framework/pipeline/chunk_plan_store.go` from
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`notarius.chunk-plan.v1` to `notarius.chunk-plan.v2`.
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2. Do not add a v1 decoder, migration, deletion routine, or D&D-specific cache
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branch. `internal/framework/chunkplan` must continue treating a schema
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mismatch as a recoverable invalid record. In `auto` mode the existing runner
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path then regenerates and atomically replaces it; `refresh` and `bypass`
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retain their existing meanings.
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3. Update `internal/framework/chunkplan/store_test.go` so its valid records use
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v2 and its invalid-record table explicitly proves that a well-formed v1
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record is reported as invalid/recoverable. It is appropriate to assert both
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version literals here because this test owns a deliberate wire
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compatibility transition.
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4. Preserve existing runner tests proving that valid current-version plans are
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reused across chunker or configuration differences and that structurally
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invalid hits regenerate. Do not add a second runner test that merely repeats
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the store's schema-version rejection and the runner's existing invalid-hit
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behavior.
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### Generic fixture cleanup
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The generic chunk-map codec must continue exercising arbitrary annotations,
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but its fixtures should not imply that the minimal `dnd/scenes` producer still
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emits them:
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1. In `internal/framework/chunkmap/codec_test.go` and
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`internal/framework/chunkmap/testdata/source_chunk_map.v1.json`, replace the
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illustrative D&D identities and semantic scene values with neutral test
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data. Use `chunk/requested` as the requested chunker, `chunk/producer` as the
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producer, and `test/chunker` as the annotation namespace; retain small JSON
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objects as annotation values so canonicalization remains exercised.
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2. Preserve all existing annotation canonicalization, strict decoding,
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defensive ownership, digest, and round-trip assertions. Do not remove
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generic annotation coverage or change the durable chunk-map schema.
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3. Retain the distinct requested and producing chunker identities to exercise
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ADR-0005 reuse without associating generic annotation behavior with a
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production module.
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### Documentation and roadmap alignment
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1. Update only the canonical current-behavior documentation that becomes
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inaccurate:
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- revise the `internal/modules/dnd/chunk/scenes` section of
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`docs/internal/modules.md` to describe the boundary-only response,
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deterministic coverage validation, annotation-free plan, and absence of
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boundary warnings;
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- in `docs/roadmap/future.md`, remove the completed chunker-minimization
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bullet and rename `Minimize And Use D&D Scene Chunking` to `Use D&D Scene
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Chunking`, retaining its still-future combat gating, ordered dependency,
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and reassessment work; and
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- set the feature roadmap status to `Implemented` only after all production,
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test, and current-documentation changes pass.
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2. Do not change `docs/integrations/chunk-map.md`: it already owns the unchanged
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generic artifact contract, permits empty maps, and correctly treats
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annotations as optional module-specific JSON.
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3. Do not change configuration, CLI, operations, LLM runtime, or
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scene-description integration documentation unless implementation reveals a
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statement that is factually false after this work. Those documents do not
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own the removed private response fields.
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4. Do not add live-model evaluation to the offline suite. At handoff, recommend
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evaluating the simpler prompt against the human-reviewed cases described in
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the feature roadmap; credentials and human quality judgment are not
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implementation completion gates.
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### Stage validation
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Run focused checks first:
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```sh
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go test -count=1 ./internal/modules/dnd/chunk/scenes
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go test -count=1 ./internal/framework/chunkplan
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go test -count=1 ./internal/framework/chunkmap
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go test -count=1 ./internal/framework/pipeline
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```
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Then run the repository-wide checks required for shared contracts:
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```sh
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gofmt -w internal/modules/dnd/chunk/scenes/*.go \
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internal/framework/chunkplan/*.go \
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internal/framework/chunkmap/*.go \
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internal/framework/pipeline/chunk_plan_store.go
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go test -count=1 ./...
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go vet ./...
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go build ./cmd/notarius
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git diff --check
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```
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Review the final diff and confirm:
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- only endpoint fields remain in the private response, prompt instructions,
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DTOs, and focused fixtures;
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- newly generated D&D scene plans have no annotations or warnings;
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- v1 cache records are recoverably invalid and new records use v2;
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- valid v2 plans still follow source-only canonical reuse;
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- generic chunk-map annotations remain supported;
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- no current-behavior document claims that `dnd/scenes` produces semantic
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annotations; and
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- no scene-aware combat or ordered-dependency work entered the change.
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## Open Questions
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None. The feature and migration choices are decision-complete.
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