Delcado 88224b80ca fix: never route GitHub Copilot Gemini/Claude models to /responses (#1062) (#1536) ...

GitHub Copilot's /responses endpoint only serves OpenAI (gpt/codex)
models. gemini-3.1-pro-preview was failing on /chat/completions with a
"not supported" error, getting cached as a codex model, then escalated
to /responses where it 400s with "does not support Responses API".

Add GithubExecutor.supportsResponsesEndpoint() and gate both the cached
/responses route and the 400-fallback on it, so Gemini/Claude always
stay on /chat/completions and the real upstream error surfaces.

Adds tests/unit/github-responses-routing.test.js (5 tests).

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

2026-05-29 15:40:42 +07:00

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