preserve OpenAI parallel tool-call policy - #97
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OpenAI-compatible requests accepted serial tool execution without carrying that constraint into provider translation, and rejected the standard parallel value. This could silently reverse caller intent on non-Codex provider routes. Encode the OpenAI setting in the established Anthropic tool-choice policy and share its interpretation across Codex, Kimi, and Grok translators. Kimi and Grok propagate the resolved value to their upstream APIs, while native Codex Responses retains its passthrough behavior. Cover both OpenAI routes, tool-choice modes, provider wire requests, validation, and native Codex passthrough. Document accepted values and precedence.
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Summary
parallel_tool_callson shared OpenAI-compatible ingressDesign
OpenAI
parallel_tool_callsis the inverse of Anthropictool_choice.disable_parallel_tool_use. The shared parser attaches that policy to the translated tool choice, synthesizingautowhen the caller omits a choice. An explicit OpenAI value determines the translated policy without changingauto,none,required, or named-function selection.Provider translators read the shared policy. Kimi and Grok emit the corresponding optional upstream
parallel_tool_callsfield. Codex uses the same reader for Anthropic Messages translation, while native/v1/responsescontinues forwarding the original request body.Verification
The pre-commit Checkle hook passed:
Regression coverage includes both OpenAI routes, omitted and explicit tool choices, both boolean values, invalid values, Kimi and Grok translated upstream payloads, and native Codex passthrough.