feat(agent): add composer final answer

2026-07-08 09:51:07 +08:00
parent a5b4502c72
commit 6015bcbf6f
20 changed files with 909 additions and 316 deletions
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+# Decisions
+
+## Scope Decision
+
+Stage four is limited to Composer final-answer generation and routing.
+
+Reason: Gatekeeper and Verifier contracts were stabilized in earlier stages; this phase should only close the final-expression path.
+
+## Composer Responsibility
+
+Composer is an expression layer, not a diagnosis layer.
+
+It may rephrase and organize only filtered material. It must not call tools, introduce new facts, rejudge root cause, or read raw Executor/tool output.
+
+## Filtering Decision
+
+`ChatService` owns Composer input filtering:
+
+| Verifier classification | Composer handling |
+|---|---|
+| `direct_observation` | `allowed_claims` |
+| `reasonable_inference` | `allowed_claims`, with bounded wording |
+| `overstated` | `allowed_hypotheses` or `missing_info` |
+| `unsupported` | `missing_info` |
+| `external_unknown` | `missing_info` |
+| `contradicted` | `missing_info` / REJECT-safe output |
+
+For REJECT, `allowed_hypotheses` is always empty.
+
+## Fallback Decision
+
+Malformed Composer output falls back to deterministic rendering from filtered Composer input.
+
+Fallback must never expose:
+
+- raw Composer JSON;
+- raw Executor JSON;
+- Executor `user_facing_answer`;
+- full unscreened tool output.
+
+## Audit Decision
+
+No new table is added. Composer output is persisted under:
+
+```text
+diagnosis_session.self_evaluation.verifier_evaluation.composer_output
+```
+
+The audit snapshot is intentionally compact and stores status plus parsed user-facing fields.
+
+## Apply Fix Record
+
+Initial targeted verification exposed test drift:
+
+- test file had a UTF-8 BOM and failed Java compilation;
+- scripted chat model did not recognize `COMPOSER_TEST_PROMPT`;
+- older tests expected three-Agent execution and temporary V2 renderer behavior;
+- LOW_CONFID assertions required indirect support to disappear instead of appearing as a possible direction.
+
+Resolution: remove BOM, add Composer script branch, and update assertions to match the committed Composer contract.
+
+## Interface Impact
+
+L2 internal behavior change:
+
+- external Chat API still returns a final answer string;
+- internal final-answer source changes from Executor/temporary renderer to Composer or safe fallback;
+- audit JSON gains `composer_output` under existing `self_evaluation`.
+
+No database schema change.