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Streaming /v1/chat/completions could emit the same logical tool call at multiple `index` values. In processStreamWithTools the Go-side iterative parser (ParseXMLIterative / ParseJSONIterative) runs on every token and emits tool-call deltas, while the C++ chat-template autoparser delivers its own tool calls via ChatDeltas that are flushed at end-of-stream by ToolCallsFromChatDeltas -> buildDeferredToolCallChunks. With both paths active the same call is emitted twice at different indices, so OpenAI clients that accumulate tool calls by `index` dispatch the tool N times. Skip the Go-side iterative parser once the autoparser is producing tool calls (hasChatDeltaToolCalls). The deferred flush stays guarded by lastEmittedCount, so the race where the Go parser emitted before the flag flipped also remains single-emission. Backends without an autoparser (e.g. vLLM) keep hasChatDeltaToolCalls=false and are unaffected. Refs #9722 Signed-off-by: bozhouDev <259759010+bozhouDev@users.noreply.github.com> Co-authored-by: bozhouDev <259759010+bozhouDev@users.noreply.github.com> Co-authored-by: Cursor <cursoragent@cursor.com>