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[FIX] Prevent OpenAI Native parallel tool calls for native tool calling #9433

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Merged
hannesrudolph merged 1 commit into from
Nov 20, 2025
Merged

[FIX] Prevent OpenAI Native parallel tool calls for native tool calling #9433

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7 changes: 7 additions & 0 deletions src/api/providers/openai-native.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -244,6 +244,7 @@ export class OpenAiNativeHandler extends BaseProvider implements SingleCompletio
strict?: boolean
}>
tool_choice?: any
parallel_tool_calls?: boolean
}

// Validate requested tier against model support; if not supported, omit.
Expand Down Expand Up @@ -302,6 +303,12 @@ export class OpenAiNativeHandler extends BaseProvider implements SingleCompletio
...(metadata?.tool_choice && { tool_choice: metadata.tool_choice }),
}

// For native tool protocol, explicitly disable parallel tool calls.
// For XML or when protocol is unset, omit the field entirely so the API default applies.
if (metadata?.toolProtocol === "native") {
body.parallel_tool_calls = false
}

// Include text.verbosity only when the model explicitly supports it
if (model.info.supportsVerbosity === true) {
body.text = { verbosity: (verbosity || "medium") as VerbosityLevel }
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