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fix(ai): prevent duplicate tool parts when model calls unavailable tool #12556

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fix(ai): prevent duplicate tool parts when model calls unavailable tool #12556

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5 changes: 5 additions & 0 deletions .changeset/fix-duplicate-tool-parts.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'ai': patch
---

Fixed duplicate tool parts when model calls an unavailable tool. The `tool-input-start` chunk creates a static part without a `dynamic` flag, but the subsequent `tool-input-error` chunk arrives with `dynamic: true`, causing a second `dynamic-tool` part to be created with the same `toolCallId`. This led to providers like Amazon Bedrock rejecting the message for duplicate tool use IDs.
7 changes: 6 additions & 1 deletion packages/ai/src/ui/process-ui-message-stream.ts
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Expand Up @@ -558,7 +558,12 @@ export function processUIMessageStream<UI_MESSAGE extends UIMessage>({
}

case 'tool-input-error': {
if (chunk.dynamic) {
const partialToolCall = state.partialToolCalls[chunk.toolCallId];
const dynamic = partialToolCall
? partialToolCall.dynamic
: chunk.dynamic;

if (dynamic) {
updateDynamicToolPart({
toolCallId: chunk.toolCallId,
toolName: chunk.toolName,
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