fix(prompt): Don't start a new tool call on repeated tool call id#2052
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Anastasiia Zarechneva (aozherelyeva) merged 2 commits intoJun 1, 2026
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`emitToolCallDelta()` started a new tool call whenever the chunk `id` was non-null. Some OpenAI-compatible providers repeat the same `id` on every streaming chunk, so a single tool call was fragmented into multiple early `ToolCallComplete` frames. Detect a new tool call only when a present `id`/`index` signal differs from the pending call, matching the existing logic in `emitReasoningDelta`.
Maria Tigina (tiginamaria)
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Maria Tigina (tiginamaria)
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Thank you for the fix! Looks good!
Anastasiia Zarechneva (aozherelyeva)
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Jun 1, 2026
Anastasiia Zarechneva (aozherelyeva)
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Thank you!
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Thanks for the review and for landing the OpenTelemetry test fix on top to unblock CI — really appreciated. |
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Closes #2002.
Summary
StreamFrameFlowBuilder.emitToolCallDelta()treated every chunk with a non-null tool-callidas a new tool call. This fix treats a repeatedidas a continuation of the pending tool call, so OpenAI-compatible providers that repeat the sameidon each streaming chunk no longer fragment one logical tool call into multiple prematureToolCallCompleteframes.Fix
A new tool call now begins only when a present
idorindexdiffers from the pending call, instead of wheneveridis non-null.Before:
After:
This follows the same id-change principle as
emitReasoningDelta; absent or blank ids still continue the pending call (the blank case preserves the #1915 handling). The fix lives in the sharedStreamFrameFlowBuilderbecause all streaming clients (OpenAI, OpenRouter, Mistral, Anthropic, DeepSeek, Ollama, Bedrock, Dashscope, Google) emit tool-call deltas through it.Tests
Two regression tests in
StreamFrameFlowBuilderTest:testEmitToolCallDeltaWithRepeatedIdAppendsToExisting(three chunks with the sameidcombine into oneToolCallComplete) andtestEmitToolCallDeltaWithRepeatedIdSeparatesDistinctToolCalls(switching to a differentidstill starts a separate tool call).:prompt:prompt-model:jvmTest(20 tests, 0 failures),wasmJsNodeTest, andktlintCheckall pass locally; the full./gradlew build(Android and browser targets) is left to CI, since this contributor environment lacks the Android SDK and a headless browser.