overview changedagents-and-tools/tool-use/overview
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729729The current weather in San Francisco is 15 degrees Celsius with partly cloudy skies.
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732[Handle tool calls](https://platform.claude.com/docs/en/agents-and-tools/tool-use/handle-tool-calls) covers each step in detail, including result formatting and error signaling; [Parallel tool use](https://platform.claude.com/docs/en/agents-and-tools/tool-use/parallel-tool-use) covers responses that call several tools at once. To skip writing this round trip yourself, use [Tool Runner](https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-runner): the SDKs execute your tools and send the results back automatically.
732[Handle tool calls](https://platform.claude.com/docs/en/agents-and-tools/tool-use/handle-tool-calls) covers each step in detail, including result formatting and error signaling; [Parallel tool use](https://platform.claude.com/docs/en/agents-and-tools/tool-use/parallel-tool-use) covers responses that call several tools at once. To skip writing this round trip yourself, use [Tool Runner](https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-runner): the SDK executes your tools and sends the results back automatically.
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734734For the full conceptual model including the agentic loop and when to choose each approach, see [How tool use works](https://platform.claude.com/docs/en/agents-and-tools/tool-use/how-tool-use-works).
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