Several downstream clients send non-cache compatibility fields across Chat, Responses, Anthropic Messages, and Responses WebSocket surfaces. The proxy now normalizes legacy functions/function_call, maps web_search tools across protocols, rejects unsupported HTTP Responses continuation shapes before upstream dispatch, and applies configurable service_tier policy consistently before requests leave the server.
Constraint: Publication flow keeps day-to-day commits on dev and opens main PRs from a release branch.
Constraint: No new dependencies; web_search-only simulation reuses the existing local search route.
Rejected: Forward external HTTP previous_response_id to strict upstreams | it produces ambiguous continuation failures and stale retry behavior outside WebSocket state.
Rejected: Add a dedicated search dependency | existing /v1/search route is sufficient for synthetic server-tool responses.
Confidence: high
Scope-risk: moderate
Directive: Keep Responses HTTP continuation checks aligned with WebSocket continuation support before relaxing these guards.
Tested: npm run typecheck:server
Tested: npx vitest run --root . src/server/proxy-core/responsesPreflight.test.ts src/server/proxy-core/serviceTierPolicy.test.ts src/server/test-fixtures/protocol/non-cache-field-matrix.test.ts src/server/transformers/openai/responses/conversion.test.ts src/server/transformers/anthropic/messages/conversion.test.ts src/server/routes/proxy/chat.stream.test.ts src/server/routes/proxy/responses.codex-oauth.test.ts
Tested: npx vitest run --root . src/server/routes/proxy/responses.websocket.test.ts
Tested: npm run repo:drift-check
Not-tested: Full application build and full Vitest suite
Co-authored-by: OmX <omx@oh-my-codex.dev>
- Added `routeCompatibility.ts` to handle response compatibility for different endpoints.
- Introduced `chatEndpointStrategy.ts` to manage chat endpoint recovery and downgrading logic.
- Created tests for chat formats and input file handling in `chatFormatsCore.test.ts` and `inputFile.test.ts`.
- Developed `endpointCompatibility.ts` to define compatibility checks and header building for various endpoints.
- Implemented protocol lifecycle management in `protocolLifecycle.ts` and corresponding tests in `protocolModel.test.ts`.
- Enhanced tooltip functionality with a new `TooltipLayer` component and associated tests.
- Refactored existing components to improve tooltip handling and ensure proper rendering in the application.
cita-777