fine-grained-tool-streaming changedagents-and-tools/tool-use/fine-grained-tool-streaming
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14 Aug 2026
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497497The 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.
498498
499<CodeGroup>
500 ```bash cURL
501 # Accumulating per-block input deltas needs a programming language; the first
502 # example's CLI tab shows the raw fragments with jq. See the SDK tabs.
503 ```
499<CodeGroup exclude="shell">
500 <CodeGroupItem language="cURL">
501 Accumulating the input fragments of each `tool_use` block needs more logic than a single shell command. Use the [Claude SDK](https://platform.claude.com/docs/en/cli-sdks-libraries/overview) for this. To see the raw fragments as they stream, run the request in [How to use fine-grained tool streaming](https://platform.claude.com/docs/en/agents-and-tools/tool-use/fine-grained-tool-streaming#how-to-use-fine-grained-tool-streaming).
502 </CodeGroupItem>
504503
505 ```bash CLI
506 # Accumulating per-block input deltas needs a programming language; the first
507 # example's CLI tab shows the raw fragments with jq. See the SDK tabs.
508 ```
504 <CodeGroupItem language="CLI">
505 Accumulating the input fragments of each `tool_use` block needs more logic than a single shell command. Use the [Claude SDK](https://platform.claude.com/docs/en/cli-sdks-libraries/overview) for this. To see the raw fragments as they stream, run the request in [How to use fine-grained tool streaming](https://platform.claude.com/docs/en/agents-and-tools/tool-use/fine-grained-tool-streaming#how-to-use-fine-grained-tool-streaming).
506 </CodeGroupItem>
509507
510508 ```python Python
511509 client = anthropic.Anthropic()
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