[v6.0] fix(openai-compatible): buffer tool call deltas until function.name arrives#16836
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…rrives Manual backport of #14760 to release-v6.0: some OpenAI-compatible providers send the first tool-call delta without function.name, which previously threw InvalidResponseDataError. Indexed deltas are now buffered until the delta carrying the name arrives; deltas that never receive a name still fail with the original error during flush. v6 has no StreamingToolCallTracker, so the buffering is implemented inline in front of the existing delta handling. (cherry picked from commit ab81968ddcf7ab6df3dc142000668234d549e848)
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Manual backport of #14760 to
release-v6.0, ported on top of the #16800 security backport since both rewrite the same delta-handling region. v6 has noStreamingToolCallTracker, so the buffering is implemented inline: indexed tool-call deltas are buffered until the delta carryingfunction.namearrives; deltas that never receive a name still fail with the originalInvalidResponseDataErrorduring flush. Original regression tests apply cleanly. openai-compatible suite passes locally (210/210) plus all dependent provider packages (cerebras, deepseek, groq, alibaba, fireworks, deepinfra, togetherai, baseten, huggingface, moonshotai, vercel).Part of the v6.0 backport tracking issue #16767.