Preserve tool schemas across provider-scoped format conversion and OpenAI gateway planners until the Antigravity boundary. Bound reference expansion, safely merge schema constraints, and lower unsupported Claude unions.
Drop unsigned historical Claude thinking without changing Gemini behavior. Add cross-format regression fixtures and retain the project's original error output policy.
Validation: 945 format tests and 527 transport tests passed; gateway cargo check passed.
The transport boundary rewrote `googleSearch` into the Gemini 1.5-era
`googleSearchRetrieval` spelling before every v1internal call, on the stated
grounds that the private backend rejects `googleSearch` when it is combined
with function declarations. That rewrite breaks grounding on Gemini 3.
Observed on stabey-124 against daily-cloudcode-pa.googleapis.com. A controlled
pair, same model and keys, 5 seconds apart:
- no `web_search_options` -> 200
- with `web_search_options` -> 502 on all three candidates
The outgoing body carried `tools: [{"googleSearchRetrieval": {}}]` and no
function declarations at all, so the documented mixed-tool rationale did not
apply. `request_candidates.error_message` holds what the backend actually
said:
Malformed function call: call:google_search{query:current UTC date time}
Malformed function call: call:google:search{query:current UTC date}
Malformed function call: call:google_search{queries:[current UTC date]}
The model reaches for `google_search`, the legacy declaration binds nothing,
and the turn dies unparsed. CLIProxyAPI sends `googleSearch` to this same
v1internal surface, including alongside function declarations.
Keep folding the snake_case `google_search` alias into the canonical
`googleSearch` key, and leave a request that already spells the tool
`googleSearchRetrieval` untouched.
Co-Authored-By: Claude Opus 5 <[email protected]>
wangpengxiang