Nightly OSS: gemini-3-flash-preview openai compatible tool call error#3178
Nightly OSS: gemini-3-flash-preview openai compatible tool call error#3178xodn348 wants to merge 1 commit intoopenai:mainfrom
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… tool call error Nightly Codex produced a focused contribution for openai#2806. Constraint: Automated nightly run; keep changes small and reviewable. Confidence: medium Scope-risk: narrow Tested: See uploaded nightly artifacts and workflow logs. Not-tested: Maintainer CI beyond this workflow.
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| if index is None: | ||
| return fallback_index |
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When tool_call_delta.index is None, this helper falls back to the delta’s position within the current chunk, but many OpenAI-compatible streams emit one tool-call delta per chunk, so that fallback is repeatedly 0. In responses that contain multiple tool calls with missing indices, later tool-call argument chunks get merged into tool_calls[0], causing incorrect tool_calls.function.arguments.* events and a corrupted final tool-call snapshot instead of preserving separate calls.
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Automated nightly Codex contribution for #2806.
Verification:
This PR is generated by xodn348/oss-nightly-control and is opened ready for maintainer review when the local nightly verification step succeeds.