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gateway: honor allowed-tool subsets from Gemini ANY and Responses allowed_tools - #164
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Add support for allowed function names in ANY requests.
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@charan-rathore 感谢！我把 两个不阻塞的后续建议，欢迎再提 PR：
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This was referenced Sep 28, 2026
This was referenced Sep 28, 2026
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Summary
Two request formats can restrict which tools the model may call, but the gateway used to forward every offered tool:
functionCallingConfigwithmode: "ANY"and a nonemptyallowedFunctionNameslist now forwards only the named declarations. One allowed name keeps its forced-choice behavior.tool_choice: {"type":"allowed_tools", ...}now readsmodeand the allowed function list, forwarding only those functions. It also keeps a namespaced function's mapping when that function is allowed, and does not forward an unlisted web search tool.String and named-function choices keep their previous behavior. Table-driven offline tests cover restricted and unrestricted choices, a namespaced function, and what Chat, Responses, Anthropic, and Code Assist send upstream.
Instinct assisted with the change and tests. No cloud keys or model calls were used.
Tests
go test ./internal/gateway -run '^(TestParseResponsesAllowed|TestParseGeminiAllowed)' -count=1go test ./internal/gateway -count=1git diff --check