feat(agent): add composer final answer

This commit is contained in:
aruo
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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Committed OpenSpec for executor-composer-final-answer.
Commit gate passed on 2026-07-08.
Validated with:
- cmd /c openspec validate executor-composer-final-answer
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schema: spec-driven
created: 2026-07-07
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# Decisions
## Context Collection
- `devflow/index.md` confirms `executor-v2-output-contract`, `executor-gatekeeper-hook`, and `executor-verifier-claim-checks` are archived.
- `openspec/changes` has no active changes before this phase.
- `openspec/specs/chat-verifier-agent/spec.md` is the existing capability that owns verifier routing and audit behavior.
- No existing `chat-composer-agent` capability exists, so this change introduces it.
## Question Pool
| Question | Type | Resolution |
|---|---|---|
| Should Composer be a new capability or folded into `chat-verifier-agent`? | evidence-driven | New `chat-composer-agent` capability plus modified `chat-verifier-agent` routing. Composer is a distinct expression layer, while ChatService routing remains part of the verifier chain. |
| Can Composer call tools or inspect raw tool output? | evidence-driven | No. The issue and prior design require Composer to receive only Verifier-allowed material. |
| Should Gatekeeper, Verifier, or Planner change in this phase? | evidence-driven | No. Stage four is limited to Composer final-answer generation and routing. |
| What is the interface impact level? | evidence-driven | L2 internal contract change: ChatService internal final-answer semantics change, but no external API or database schema changes. |
## Key Decisions
- Composer is implemented as `chat_composer` or an equivalent model call after Verifier.
- Composer input is assembled by ChatService, not by the model.
- `claim_checks` are authoritative for filtering allowed material.
- REJECT input always has `allowed_hypotheses=[]`.
- Composer malformed output falls back to fixed safe templates.
- Fallback must never use Executor `user_facing_answer` or raw Executor JSON.
- Composer audit is persisted under `verifier_evaluation.composer_output`.
## Cross-Artifact Alignment
| Source | Alignment |
|---|---|
| Issue objective | Stage four in `mvp/issues/executor-structured-output-v2.md` requires Composer output final answer from Verifier-allowed material. Covered by proposal, design, specs, and tasks. |
| Proposal -> design | Proposal says Composer owns final expression; design defines input filtering, output parsing, fallback, and audit. |
| Design -> specs | Design decisions are reflected in `chat-composer-agent` requirements and modified `chat-verifier-agent` routing requirements. |
| Specs -> tasks | Each required behavior has implementation and test tasks, including malformed fallback and no raw output leakage. |
## Commit Gate Notes
- Interface impact: L2 internal.
- No unresolved user-interview question identified.
- No database migration required.
- No OpenSpec/devflow conflict found.
## Apply Notes
- Implemented `chat_composer` as a post-Verifier expression Agent in `ChatService`.
- `ChatService` now builds Composer input from `VerifierDecision` plus parsed Executor structured output, not from raw Executor answer text.
- PASS, LOW_CONFID, and REJECT final-answer paths now use Composer output or a deterministic safe fallback.
- Verifier-missing or Verifier-malformed paths use fixed fallback directly because there is no trustworthy Verifier decision for Composer.
- Composer audit is persisted under `verifier_evaluation.composer_output` without adding a database table.
## Test Drift And Fixes
- Initial test compilation failed because `ChatServiceSequentialAgentTest.java` had a UTF-8 BOM at the file start. Removed the BOM.
- Existing sequential-flow tests still expected the old three-Agent call sequence and temporary V2 renderer behavior. Updated them to include `chat_composer` when a valid Verifier decision exists.
- Tests that exercise fixed fallback now force malformed Composer output so they verify no raw JSON or Executor final answer leakage.
- LOW_CONFID tests were updated to allow indirect support to appear as a possible direction rather than requiring it to disappear from all final-answer text.
## Verification
Passed:
```powershell
mvn "-Dtest=ChatServiceSequentialAgentTest" test
mvn "-Dtest=ExecutorGatekeeperServiceTest,VerifierInputHookTest,ChatServiceSequentialAgentTest" test
cmd /c openspec validate executor-composer-final-answer
cmd /c openspec validate --specs
```
Known existing warnings:
- Maven reports duplicate `spring-boot-starter-test` dependency in `pom.xml`.
- Existing Lombok `@Builder` default warnings remain.
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## Context
After the first three Executor Structured Output V2 stages, the Chat diagnosis chain is:
```text
chat_planner
-> chat_executor
-> VerifierInputHook + Gatekeeper
-> chat_verifier
-> ChatService final rendering
```
Executor now emits structured diagnostic material, Gatekeeper validates deterministic evidence failures, and Verifier emits `claim_checks`. The remaining risk is final answer rendering: the user-facing answer must be produced from Verifier-allowed material, not from raw Executor output or temporary V2 renderers.
Stage four adds the final expression layer:
```text
VerifierDecision + Executor structured output
-> ChatService filters allowed material
-> chat_composer
-> Composer JSON
-> final diagnosis_session.answer
```
## Goals / Non-Goals
**Goals:**
- Add a Composer prompt and model call after Verifier.
- Ensure Composer receives only filtered material derived from Verifier decisions.
- Ensure final user answers for PASS, LOW_CONFID, and REJECT do not read Executor `user_facing_answer`, raw Executor JSON, or raw tool output.
- Preserve safe LOW_CONFID/REJECT degradation when Composer output is malformed.
- Persist Composer output for audit under `verifier_evaluation.composer_output`.
**Non-Goals:**
- No Planner changes.
- No Executor retry changes.
- No Gatekeeper rule expansion.
- No Verifier verification-class expansion.
- No database schema migration.
- No stage-five fixture expansion.
## Decisions
### Composer is an expression layer, not a diagnosis layer
Composer SHALL receive only filtered material:
- `original_query`
- `verdict`
- `allowed_claims`
- `allowed_hypotheses`
- `missing_info`
- `recommended_actions`
- `rationale`
It SHALL NOT receive raw tool output or the full unscreened Executor output. This keeps diagnosis ownership with Executor + Verifier and prevents Composer from inventing new facts.
Alternative considered: render final answers with deterministic Java templates only. Rejected because PASS and LOW_CONFID answers still need natural, user-readable synthesis; fixed templates become rigid and would push semantic composition back into Executor or Verifier.
### ChatService owns filtering
ChatService filters Executor material using Verifier `claim_checks` before invoking Composer.
Suggested mapping:
| Verifier classification | Composer handling |
|---|---|
| `direct_observation` | include in `allowed_claims` as confirmed material |
| `reasonable_inference` | include in `allowed_claims`, but do not allow “唯一根因” wording unless claim type already supports root cause |
| `overstated` | do not include as confirmed; may become `allowed_hypotheses` or `missing_info` |
| `unsupported` | do not include as confirmed; may become `missing_info` |
| `external_unknown` | do not include as confirmed; may become `missing_info` |
| `contradicted` | do not include as confirmed; favor REJECT-safe output |
For `REJECT`, `allowed_hypotheses` SHALL be empty so the final answer does not keep speculating after a rejected evidence chain.
### Composer output is strict JSON with safe fallback
Composer SHALL output:
```json
{
"answer_summary": "...",
"recommended_actions": [
{
"action_text": "...",
"reason": "..."
}
],
"user_facing_answer": "..."
}
```
If output parsing fails or required fields are missing, ChatService SHALL use fixed safe templates from filtered material. The fallback SHALL NOT display raw Composer JSON, raw Executor JSON, or Executor `user_facing_answer`.
### Audit stays in self_evaluation
No new table is needed. ChatService persists a minimal Composer audit snapshot:
```json
{
"verifier_evaluation": {
"composer_output": {
"status": "valid",
"answer_summary": "...",
"recommended_actions": [],
"user_facing_answer": "..."
}
}
}
```
When Composer fails, `status` should be `malformed` or `fallback`, with a short `detail`. The audit should remain compact and avoid storing full prompt copies.
### Interface impact is L2 internal
The external Chat API still returns a final answer string. Internally, `ChatService` gains Composer input/output handling and final rendering semantics change. This is an internal behavioral contract change because existing PASS behavior can no longer direct-output Executor material.
## Risks / Trade-offs
- Risk: Composer introduces another LLM call and can fail formatting.
- Mitigation: strict JSON contract plus deterministic fallback templates.
- Risk: filtering is too strict and PASS answers become terse.
- Mitigation: include both direct observations and reasonable inferences, but preserve verdict-specific wording constraints.
- Risk: legacy tests expect PASS to use Executor output.
- Mitigation: update tests to assert Composer or safe fallback is the only final-answer source.
- Risk: malformed Composer output could leak raw JSON.
- Mitigation: parse output before exposing it; fallback only from filtered material.
## Migration Plan
1. Add `chat-composer-prompt.md`.
2. Add Composer input assembly and output parsing in `ChatService`.
3. Replace PASS temporary V2 rendering with Composer-or-safe-template rendering.
4. Persist `composer_output` under `verifier_evaluation`.
5. Update tests to cover PASS, LOW_CONFID, REJECT, filtered claims, and malformed output fallback.
Rollback:
- Keep fallback templates available if Composer is disabled or malformed.
- Do not roll back to Executor `user_facing_answer`; that would reintroduce the original evidence-attribution risk.
## Open Questions
None blocking. Stage four defaults:
- Composer is implemented as `chat_composer`.
- Composer does not call tools.
- Composer output failure falls back to fixed safe templates.
- No database schema changes.
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## Why
Stage one removed final-answer fields from Executor, stage two added deterministic Gatekeeper checks, and stage three made Verifier claim-oriented. The remaining gap is final answer rendering: ChatService can still rely on temporary V2 rendering paths instead of a dedicated expression layer, which risks letting unverified Executor material shape user-facing answers.
This phase introduces a Composer expression layer so final Chat answers are generated only from Verifier-allowed material.
## What Changes
- Add a `chat_composer` final-answer generation step after Verifier.
- Add a strict Composer prompt and JSON output contract with `answer_summary`, `recommended_actions`, and `user_facing_answer`.
- Build Composer input in `ChatService` from filtered Verifier results:
- `allowed_claims`
- `allowed_hypotheses`
- `missing_info`
- `recommended_actions`
- `rationale`
- Ensure PASS, LOW_CONFID, and REJECT final answers no longer read Executor `user_facing_answer` or raw Executor JSON.
- Persist Composer output in `diagnosis_session.self_evaluation.verifier_evaluation.composer_output`.
- Add safe fallback templates for malformed Composer output that never expose raw Executor JSON or raw Composer JSON.
## Capabilities
### New Capabilities
- `chat-composer-agent`: Final expression layer that turns Verifier-allowed structured material into a readable Chinese user answer without introducing new facts.
### Modified Capabilities
- `chat-verifier-agent`: ChatService final routing changes so Verifier verdicts feed Composer or safe fixed templates instead of direct Executor answer paths.
## Impact
- Affected prompt: add `src/main/resources/prompts/chat-composer-prompt.md`.
- Affected service: `ChatService` final rendering after Verifier, Composer input assembly, Composer output parsing, malformed-output fallback.
- Affected audit: `diagnosis_session.self_evaluation.verifier_evaluation` gains `composer_output`.
- Affected tests: `ChatServiceSequentialAgentTest` and focused tests around Composer input filtering, final answer routing, and malformed Composer fallback.
- Database schema: no table or column change.
- External API: no endpoint contract change; final answer text semantics become stricter because unverified Executor material is no longer a source for user-visible answers.
## Non-Goals
- No Planner changes.
- No Gatekeeper rule expansion.
- No Verifier classification changes.
- No Executor retry behavior change.
- No database migration.
- No stage-five eval fixture expansion in this phase.
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## ADDED Requirements
### Requirement: Composer SHALL generate final user-facing Chat answers
The system SHALL invoke a Composer expression layer after Verifier to generate the final user-facing Chat answer from Verifier-allowed material.
#### Scenario: Composer receives only filtered material
- **WHEN** ChatService invokes Composer
- **THEN** the Composer input SHALL contain `original_query`, `verdict`, `allowed_claims`, `allowed_hypotheses`, `missing_info`, `recommended_actions`, and `rationale`
- **AND** the Composer input SHALL NOT contain raw tool output
- **AND** the Composer input SHALL NOT contain the full unscreened Executor output
- **AND** the Composer input SHALL NOT contain Executor `user_facing_answer`
#### Scenario: Composer outputs strict JSON
- **WHEN** Composer completes
- **THEN** it SHALL output exactly one JSON object
- **AND** the JSON object SHALL include `answer_summary`, `recommended_actions`, and `user_facing_answer`
- **AND** it SHALL NOT output Markdown, code fences, or explanatory text outside the JSON object
#### Scenario: Composer does not introduce new facts
- **WHEN** Composer produces `answer_summary`, `recommended_actions`, or `user_facing_answer`
- **THEN** every service name, entity, timestamp, error code, metric value, root cause, and recommendation reason SHALL be derived from the Composer input
- **AND** Composer SHALL NOT add facts from model knowledge, raw tool history, or Executor raw text
### Requirement: Composer input SHALL honor Verifier claim checks
ChatService SHALL construct Composer input by filtering Executor structured output through Verifier `claim_checks`.
#### Scenario: Passing claims become allowed claims
- **WHEN** a claim check verification is `direct_observation`
- **THEN** ChatService SHALL include the matching Executor claim in `allowed_claims`
#### Scenario: Reasonable inferences remain bounded
- **WHEN** a claim check verification is `reasonable_inference`
- **THEN** ChatService MAY include the matching Executor claim in `allowed_claims`
- **AND** the final answer SHALL NOT describe it as the sole confirmed root cause unless the allowed claim itself is a root-cause claim and the final verdict is `PASS`
#### Scenario: Overstated claims are not confirmed findings
- **WHEN** a claim check verification is `overstated`
- **THEN** ChatService SHALL NOT include the matching Executor claim as a confirmed item in `allowed_claims`
- **AND** ChatService MAY include it as `allowed_hypotheses` or represent it in `missing_info`
#### Scenario: Unsupported or external claims are withheld
- **WHEN** a claim check verification is `unsupported`, `external_unknown`, or `contradicted`
- **THEN** ChatService SHALL NOT include the matching Executor claim in `allowed_claims`
- **AND** the final user-facing answer SHALL NOT present that claim as confirmed
### Requirement: Composer SHALL respect verdict-specific wording
Composer SHALL phrase final answers according to the effective Verifier verdict.
#### Scenario: PASS answer uses confirmed material
- **WHEN** the effective verdict is `PASS`
- **THEN** the final answer MAY state confirmed findings from `allowed_claims`
- **AND** it SHALL only state root cause confirmed when an allowed root-cause claim is present
#### Scenario: LOW_CONFID answer separates findings and gaps
- **WHEN** the effective verdict is `LOW_CONFID`
- **THEN** the final answer SHALL distinguish confirmed information from possible directions
- **AND** it SHALL mention evidence gaps from `missing_info`
- **AND** it SHALL NOT turn `allowed_hypotheses` into confirmed findings
#### Scenario: REJECT answer avoids root-cause conclusions
- **WHEN** the effective verdict is `REJECT`
- **THEN** Composer input SHALL have `allowed_hypotheses=[]`
- **AND** the final answer SHALL state that current evidence cannot support a reliable conclusion
- **AND** the final answer SHALL NOT include a root-cause conclusion
### Requirement: Composer failures SHALL degrade safely
The system SHALL tolerate malformed Composer output without leaking raw JSON or unverified Executor material.
#### Scenario: malformed Composer output falls back safely
- **WHEN** Composer returns malformed JSON or omits required fields
- **THEN** ChatService SHALL produce a final answer using a fixed safe fallback template based only on filtered material
- **AND** the final answer SHALL NOT expose raw Composer output
- **AND** the final answer SHALL NOT expose raw Executor output
- **AND** the final answer SHALL NOT use Executor `user_facing_answer`
#### Scenario: Composer audit is persisted
- **WHEN** ChatService persists verifier evaluation
- **THEN** `diagnosis_session.self_evaluation.verifier_evaluation.composer_output` SHALL record whether Composer output was valid or fallback was used
- **AND** the audit SHALL include the parsed Composer fields when valid
- **AND** the audit SHALL remain compact and SHALL NOT store full raw tool output
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## MODIFIED Requirements
### Requirement: ChatService SHALL route based on Verifier verdict
The system SHALL use ChatService for explicit single-round `Planner -> Executor -> Verifier -> Composer` orchestration and SHALL use ChatService to control whether an additional round is allowed.
#### Scenario: PASS -> Composer output
- **WHEN** Verifier outputs verdict="PASS"
- **THEN** ChatService SHALL filter Verifier-allowed material and invoke Composer or a safe fixed template
- **AND** the final user-facing answer SHALL NOT pass through raw Executor output
- **AND** the final user-facing answer SHALL NOT read Executor `user_facing_answer`
#### Scenario: LOW_CONFID score>=0.5 -> Composer output with uncertainty
- **WHEN** Verifier outputs verdict="LOW_CONFID" with groundedness_score >= 0.5
- **THEN** ChatService SHALL filter Verifier-allowed material and invoke Composer or a safe fixed template
- **AND** the final user-facing answer SHALL distinguish confirmed information, possible directions, and evidence gaps
- **AND** unsupported raw Executor claims SHALL NOT be presented as confirmed conclusions
#### Scenario: LOW_CONFID score<0.5 -> trigger one additional round
- **WHEN** Verifier outputs verdict="LOW_CONFID" with groundedness_score < 0.5 and this is the first callback
- **THEN** the ChatService SHALL invoke one additional `Planner -> Executor -> Verifier` round to supplement evidence
- **AND** after the second Verifier run, verdict="LOW_CONFID" SHALL be routed to Composer or a safe fixed template
- **AND** after the second Verifier run, verdict="REJECT" SHALL still produce a degraded Composer-safe output
#### Scenario: REJECT does not enter retry round
- **WHEN** Verifier outputs verdict="REJECT"
- **THEN** the system SHALL NOT start a retry round for evidence supplementation
- **AND** it SHALL produce a degraded output directly through Composer-safe rendering
#### Scenario: REJECT -> degraded output
- **WHEN** Verifier outputs verdict="REJECT"
- **THEN** the system SHALL output a degraded result indicating the answer cannot be reliably generated
- **AND** it SHALL NOT pass through the raw Executor answer
- **AND** it SHALL NOT include a root-cause conclusion
### Requirement: Verifier SHALL be observable
The Verifier's verdict and downstream final-answer composition SHALL be persisted for observability.
#### Scenario: claim checks written to self_evaluation
- **WHEN** the Verifier evaluation is persisted
- **THEN** `diagnosis_session.self_evaluation.verifier_evaluation` SHALL include `claim_checks`
- **AND** it SHALL continue to include compatibility `facts_checked`
- **AND** existing fields such as `verdict`, `groundedness_score`, `rationale`, `executor_output_parse_status`, `tool_trace_summary`, and `gatekeeper_result` SHALL be preserved
#### Scenario: composer output written to self_evaluation
- **WHEN** final answer composition completes
- **THEN** `diagnosis_session.self_evaluation.verifier_evaluation` SHALL include `composer_output`
- **AND** `composer_output` SHALL indicate whether parsed Composer output or fallback rendering was used
- **AND** existing verifier fields such as `claim_checks`, `facts_checked`, `gatekeeper_result`, and `tool_trace_summary` SHALL be preserved
#### Scenario: verdict written to self_evaluation
- **WHEN** the Verifier produces a verdict
- **THEN** the ChatService SHALL write the verdict data under `diagnosis_session.self_evaluation.verifier_evaluation`
- **AND** existing `rule_evaluation` data SHALL be preserved
#### Scenario: gatekeeper result written to self_evaluation
- **WHEN** the Verifier evaluation is persisted
- **THEN** `diagnosis_session.self_evaluation.verifier_evaluation` SHALL include `gatekeeper_result`
- **AND** existing verifier fields such as `verdict`, `facts_checked`, `executor_output_parse_status`, and `tool_trace_summary` SHALL be preserved
## ADDED Requirements
### Requirement: User-facing verifier outputs SHALL follow Composer-safe protocols
The system SHALL use Composer or fixed safe templates for PASS, LOW_CONFID, and REJECT user-facing responses.
#### Scenario: PASS uses Composer-safe output
- **WHEN** the final verdict is `PASS`
- **THEN** the user-facing response SHALL be generated from Verifier-allowed material through Composer or a safe fixed template
- **AND** it SHALL NOT use Executor `user_facing_answer`
- **AND** it SHALL NOT expose raw Executor JSON
#### Scenario: LOW_CONFID uses Composer-safe uncertainty output
- **WHEN** the final verdict is `LOW_CONFID`
- **THEN** the user-facing response SHALL include only confirmed facts, possible directions, evidence gaps, and next-step suggestions derived from Verifier-allowed material
- **AND** optional evidence gaps, if present, SHALL come only from verifier-identified gaps
- **AND** unsupported raw Executor claims SHALL NOT be presented as confirmed conclusions
#### Scenario: REJECT uses degraded template
- **WHEN** the final verdict is `REJECT`
- **THEN** the user-facing response SHALL use a degraded template or Composer-safe degraded output
- **AND** it SHALL include only confirmed facts, evidence gaps, and next-step suggestions
- **AND** it SHALL NOT include unverified raw answer content
- **AND** it SHALL NOT include a root-cause conclusion
## REMOVED Requirements
### Requirement: User-facing verifier outputs SHALL follow fixed templates
**Reason**: final user-facing answers are no longer owned by legacy Verifier templates. They must be generated from Verifier-allowed material through Composer or deterministic safe fallback.
**Migration**: use "User-facing verifier outputs SHALL follow Composer-safe protocols" and the new `chat-composer-agent` capability.
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## 1. Composer Prompt Contract
- [x] 1.1 Add `src/main/resources/prompts/chat-composer-prompt.md`.
- [x] 1.2 Define Composer input fields: `original_query`, `verdict`, `allowed_claims`, `allowed_hypotheses`, `missing_info`, `recommended_actions`, and `rationale`.
- [x] 1.3 Define strict JSON output fields: `answer_summary`, `recommended_actions`, and `user_facing_answer`.
- [x] 1.4 State verdict-specific wording rules for PASS, LOW_CONFID, and REJECT.
- [x] 1.5 State that Composer must not add facts, call tools, output Markdown, or use raw Executor/tool output.
## 2. Composer Invocation And Input Filtering
- [x] 2.1 Load the Composer prompt in `ChatService`.
- [x] 2.2 Add a `chat_composer` Agent or equivalent Composer model call after final Verifier decision.
- [x] 2.3 Build Composer input from Verifier decision and Executor structured output.
- [x] 2.4 Filter `allowed_claims` from `claim_checks` using `direct_observation` and bounded `reasonable_inference`.
- [x] 2.5 Exclude `unsupported`, `external_unknown`, and `contradicted` claims from confirmed output.
- [x] 2.6 Downgrade `overstated` claims to `allowed_hypotheses` or `missing_info`.
- [x] 2.7 Ensure REJECT Composer input has `allowed_hypotheses=[]`.
- [x] 2.8 Ensure Composer input contains no raw tool output, full unscreened Executor output, or Executor `user_facing_answer`.
## 3. Composer Output Parsing, Fallback, And Audit
- [x] 3.1 Parse Composer strict JSON output.
- [x] 3.2 Add safe fallback rendering for malformed Composer output.
- [x] 3.3 Ensure fallback rendering never exposes raw Composer JSON, raw Executor JSON, or Executor `user_facing_answer`.
- [x] 3.4 Persist `composer_output` under `diagnosis_session.self_evaluation.verifier_evaluation`.
- [x] 3.5 Preserve existing verifier audit fields when writing Composer output.
## 4. Final Answer Routing
- [x] 4.1 Replace PASS temporary V2 renderer usage with Composer or safe template rendering.
- [x] 4.2 Ensure LOW_CONFID final answer uses Composer-safe filtered material.
- [x] 4.3 Ensure REJECT final answer does not include root-cause conclusions and does not pass through Executor raw answer.
- [x] 4.4 Ensure Executor `user_facing_answer` is not read by any final answer path.
## 5. Tests And Verification
- [x] 5.1 Add or update tests proving Composer input excludes raw tool output and full Executor output.
- [x] 5.2 Add or update tests proving unsupported claims do not appear as confirmed final-answer content.
- [x] 5.3 Add or update tests for PASS root-cause wording only when an allowed root-cause claim exists.
- [x] 5.4 Add or update tests for LOW_CONFID separation of confirmed information, possible directions, and evidence gaps.
- [x] 5.5 Add or update tests for REJECT with `allowed_hypotheses=[]` and no root-cause conclusion.
- [x] 5.6 Add or update tests for malformed Composer fallback with no raw JSON leakage.
- [x] 5.7 Run targeted Maven tests.
- [x] 5.8 Validate this OpenSpec change and all specs.