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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Developer Platform 21 Oct 2026
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fine-grained-tool-streaming changedagents-and-tools/tool-use/fine-grained-tool-streaming

Nearest release: v2.1.307, published an hour after this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

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From line 486 where the diff opens
First seen 14 Aug 2026 this site's first read of the page
Recorded edits11to this page, all time

The whole hunk

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486486 
487487The accumulation contract:
488488 
4891. On `content_block_start` with `type: "tool_use"`, initialize an empty string: `input_json = ""`
4902. For each `content_block_delta` with `type: "input_json_delta"`, append: `input_json += event.delta.partial_json`
4913. On `content_block_stop`, parse the accumulated string
4891. On `content_block_start` with `type: "tool_use"`, initialize an empty string: `input_json = ""`.
4902. For each `content_block_delta` with `type: "input_json_delta"`, append: `input_json += event.delta.partial_json`.
4913. On `content_block_stop`, parse the accumulated string.
492492 
493Guard the parse, as the following SDK examples do. A response can also stop at `max_tokens` midway through a parameter. Check the [stop reason](https://platform.claude.com/docs/en/build-with-claude/handling-stop-reasons) and decide whether to retry the request with a higher `max_tokens` or repair the partial input.
493Guard the parse, as the following example does. A response can also stop at `max_tokens` midway through a parameter. Check the [stop reason](https://platform.claude.com/docs/en/build-with-claude/handling-stop-reasons) and decide whether to retry the request with a higher `max_tokens` or repair the partial input.
494494 
495495The type mismatch between the initial `input: {}` (object) and `partial_json` (string) is by design. The empty object marks the slot in the content array. The delta strings build the real value.
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931931 </Card>
932932 
933933 <Card title="Handle tool calls" icon="arrows-left-right" href="https://platform.claude.com/docs/en/agents-and-tools/tool-use/handle-tool-calls">
934 Parse tool\_use blocks, format tool\_result responses, and handle errors with is\_error.
934 Parse `tool_use` blocks, format `tool_result` responses, and handle errors with `is_error`.
935935 </Card>
936936 
937937 <Card title="Tool reference" icon="book" href="https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-reference">
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