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fix(stream): route content_block_delta to most-recently-started block at index #3

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fix(stream): route content_block_delta to most-recently-started block at index #3

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13 changes: 12 additions & 1 deletion src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -877,7 +877,18 @@ function processStreamEvent(
}

if (event?.type === "content_block_delta") {
const index = c.turnBlocks.findIndex((b: any) => b.index === event.index);
// Match the most-recently-started block at this content_block index.
// A later tool_use can reuse an index already held by an earlier
// block (seen in real streams); first-match lookup would append the
// later block's deltas onto the earlier one, concatenating two JSON
// payloads and silently dropping one tool's arguments. Reverse scan
// routes deltas to the active (last-started) block. (Stop events
// keep first-match: they run in start order and each deletes its
// index, so the next stop finds the correct block.)
let index = -1;
for (let i = c.turnBlocks.length - 1; i >= 0; i--) {
if (c.turnBlocks[i].index === event.index) { index = i; break; }
}
const block = c.turnBlocks[index];
if (!block) return;
if (event.delta?.type === "text_delta" && block.type === "text") {
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