fix(agents): enforce exact profile model identity - #3473
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📝 SummarySummary by CodeRabbit
WalkthroughThe change enforces exact profile model identity. Unavailable exact models now fail before inference. Auto-fallback and advertised explicit fallback remain supported. Workflow session reuse now checks persisted runtime model identity. ChangesExact model selection
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to A workflow transition can still resume a session using an unauthorized model after a lookup failure. The fallback specifications should also be corrected before merge to preserve the intended launch and warning contracts. Sequence Diagram(s)sequenceDiagram
participant Workflow
participant ProfileResolver
participant SessionManager
participant ACP
Workflow->>ProfileResolver: resolve destination profile
ProfileResolver-->>Workflow: model, fallback, and auto-fallback policy
Workflow->>SessionManager: inspect reusable session runtime model
SessionManager-->>Workflow: matching or mismatched persisted model
Workflow->>ACP: create fresh session when identity mismatches
ACP-->>Workflow: advertised model catalog
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 35.71% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 28 functions across 11 files. (8 skipped: 8 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Claude finished @yattdev's task in 4m 16s —— View job PR Review: fix(agents): enforce exact profile model identity
FindingsSuggestion (recommended, doesn't block)
What the review covered
Orchestrator
ADR Spec and public docs — Requirements updated with exact-profile amendment. E2E tests — New strict-mismatch cases and mobile-parallel spec additions are properly structured using the established Summary
Verdict: Ready to merge with suggestions — the two findings are debuggability/test-coverage improvements; neither affects correctness. |
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| Filename | Overview |
|---|---|
| apps/backend/internal/agent/runtime/lifecycle/start_model.go | Enforces strict executor-attested model selection while retaining explicitly authorized fallback behavior. |
| apps/backend/internal/orchestrator/event_handlers_workflow.go | Adds exact-model session isolation, but its reusable-session inspection can fail open and be bypassed by the downstream lookup. |
| apps/backend/internal/backendapp/adapters.go | Propagates fallback-model and auto-fallback policy fields through profile resolution. |
| apps/backend/internal/orchestrator/executor/executor.go | Extends resolved profile information with fallback policy fields. |
| apps/web/e2e/tests/session/model-mismatch-warning.spec.ts | Covers strict launch failure and authorized auto-fallback warning persistence. |
| docs/decisions/2026-09-06-exact-profile-model-identity.md | Records the exact-model identity policy and authorized deviation paths. |
Flowchart
%%{init: {'theme': 'neutral'}}%%
flowchart TD
A[Workflow enters profile lane] --> B{Reuse policy?}
B -- No --> C[Create fresh session]
B -- Yes --> D[Find reusable session]
D --> E{Persisted model authorized?}
E -- No --> C
E -- Yes --> F[Promote reusable session]
F --> G[Resume ACP identity]
G --> H[Lifecycle model attestation]
H --> I{Requested or fallback model selectable?}
I -- Yes --> J[Dispatch first prompt]
I -- No, auto-fallback --> K[Use executor default and persist warning]
I -- No, strict --> L[Fail before inference]
Reviews (1): Last reviewed commit: "test(agents): advertise models in restar..." | Re-trigger Greptile
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Actionable comments posted: 3
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Inline comments:
In `@apps/backend/internal/orchestrator/event_handlers_workflow.go`:
- Line 2843: Update exactModelWorkflowStartPolicy to return New, rather than
Reuse, when reusable-session inspection fails; preserve Reuse only when
inspection succeeds and confirms reuse is valid, so
switchSessionForStepWithPolicies cannot bypass
workflowEntryRequiresFreshExactModelSession.
In `@docs/specs/agents/requirements/no-silent-model-fallback.md`:
- Around line 30-31: Update AC-AGENTS-NO-SILENT-MODEL-FALLBACK-001.2 so
provider-default continuation with auto_fallback=true requires exactly one
persisted task-chat warning that survives reload and includes the effective
model when known, rather than only requiring visible authorization.
In `@docs/specs/agents/system-design/no-silent-model-fallback-01.md`:
- Around line 59-61: Update the explicit-fallback launch rule in the policy text
so the configured start model is applied first when available; use the
configured fallback only if that start model is unavailable and the fallback is
advertised and applicable. Preserve the existing failure behavior when neither
model can be used, and keep auto_fallback=true as the only case allowing the
executor’s current or default model.
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📒 Files selected for processing (19)
apps/backend/internal/agent/runtime/lifecycle/manager_interaction_test.goapps/backend/internal/agent/runtime/lifecycle/session_test.goapps/backend/internal/agent/runtime/lifecycle/start_model.goapps/backend/internal/agent/runtime/lifecycle/start_model_executor_authority_test.goapps/backend/internal/backendapp/adapters.goapps/backend/internal/orchestrator/event_handlers_workflow.goapps/backend/internal/orchestrator/event_handlers_workflow_profile_session_policy_test.goapps/backend/internal/orchestrator/executor/executor.goapps/web/e2e/tests/session/mobile-model-mismatch-warning.spec.tsapps/web/e2e/tests/session/model-mismatch-warning-helpers.tsapps/web/e2e/tests/session/model-mismatch-warning.spec.tsdocs/decisions/2026-08-15-executor-authoritative-model-selection.mddocs/decisions/2026-09-06-exact-profile-model-identity.mddocs/decisions/INDEX.mddocs/public/agents-and-profiles.mddocs/public/executors.mddocs/specs/agents/requirements/no-silent-model-fallback.mddocs/specs/agents/system-design/no-silent-model-fallback-01.mddocs/specs/agents/system-design/no-silent-model-fallback-02.md
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@carlosflorencio — PR #3473 is ready for upstream review at exact head |
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Tip
PR walkthrough: Open the visual walkthrough
Exact agent profiles are cost and runtime-identity policies, so an executor that cannot attest the requested model now fails before inference instead of silently substituting its default. Explicit fallback and auto-fallback remain the only opt-in deviation paths, with durable evidence.
Important Changes
Validation
go test -run 'TestApplyStartModelPolicyExecutorAuthority|TestInitializeAndPromptWithLayers_UnadvertisedModelFailsBeforeInference' ./internal/agent/runtime/lifecyclego test -run 'TestPrepareWorkflowStepSession_(QAToPRDoesNotReuseSolRuntime|HumanQAToWorkReplacesExactProfileRuntimeOverride|HumanQAToWorkKeepsAuthorizedFallbackSession)' ./internal/orchestratorgo test -run 'TestPersistSessionModel|TestPersistSessionModelAndRuntimeConfigPersistsSnapshotRuntimeConfigAndCache' ./internal/orchestratorgo test ./internal/backendapppython3 scripts/lint-spec-files.py --allnode --test scripts/validate-public-docs.test.mjsnode scripts/validate-public-docs.mjscd apps/web && pnpm run i18n:checkcd apps/web && pnpm e2e:run --no-build tests/session/model-mismatch-warning.spec.ts -- --grep 'auto-fallback continues with the executor default and persists one warning after reload' --retries=0cd apps/web && pnpm e2e:run --no-build --project mobile-chrome tests/session/mobile-model-mismatch-warning.spec.ts -- --retries=0The initial full desktop E2E invocation had one isolated backend-fixture startup exit before health; its strict case passed, and the affected auto-fallback case passed in a fresh retries-disabled run.
Possible Improvements
Low risk: production-style H6 validation remains blocked until the deployed backend uses this branch; a fresh exact-profile session must still attest executor model availability after rollout.
Checklist
apps/web/), I have added or updated Playwright e2e tests inapps/web/e2e/and verified them withmake test-e2e.docs/public/**and updated them or noted why no docs change is needed.Preview Environment
d80c50aScreenshots