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HomeDocsClaude Developer Platform 1 Oct 2026
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API usage primer for Claude changedclaude_api_primer

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### Chain of thought

The whole hunk

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633633 
634634Tools do not necessarily need to be client functions. You can use tools anytime you want the model to return JSON output that follows a provided schema.
635635 
636### Chain of thought
636### Parallel tool use
637637 
638When using tools, Claude often shows its "chain of thought," that is, the step-by-step reasoning it uses to break down the problem and determine which tools to use.
638By default, Claude may use multiple tools to answer a user query. You can disable this behavior by setting `disable_parallel_tool_use=true`.
639639 
640## Handling tool use and tool result content blocks
641 
642### Handling results from client tools
643 
644The response has a `stop_reason` of `tool_use` and one or more `tool_use` content blocks that include:
645 
646* `id`: A unique identifier for this particular tool use block.
647* `name`: The name of the tool being used.
648* `input`: An object containing the input being passed to the tool.
649 
640650```json
641651{
642652 "role": "assistant",
643653 "content": [
644654 {
645 "type": "text",
646 "text": "<thinking>To answer this question, I will: 1. Use the get_weather tool to get the current weather in San Francisco. 2. Use the get_time tool to get the current time in the America/Los_Angeles timezone, which covers San Francisco, CA.</thinking>"
647 },
648 {
649655 "type": "tool_use",
650656 "id": "toolu_01A09q90qw90lq917835lq9",
651657 "name": "get_weather",
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654660 ]
655661}
656662```
657 
658### Parallel tool use
659 
660By default, Claude may use multiple tools to answer a user query. You can disable this behavior by setting `disable_parallel_tool_use=true`.
661 
662## Handling tool use and tool result content blocks
663 
664### Handling results from client tools
665 
666The response has a `stop_reason` of `tool_use` and one or more `tool_use` content blocks that include:
667 
668* `id`: A unique identifier for this particular tool use block.
669* `name`: The name of the tool being used.
670* `input`: An object containing the input being passed to the tool.
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672664When you receive a tool use response, you should:
673665 
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