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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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736For connecting to Model Context Protocol (MCP) servers, see the [MCP connector](https://platform.claude.com/docs/en/agents-and-tools/mcp-connector). For building your own MCP client, see the Model Context Protocol guide to [building an MCP client](https://modelcontextprotocol.io/docs/develop/build-client).
736To connect to Model Context Protocol (MCP) servers, see the [MCP connector](https://platform.claude.com/docs/en/agents-and-tools/mcp-connector). To build your own MCP client, see the Model Context Protocol guide to [building an MCP client](https://modelcontextprotocol.io/docs/develop/build-client).
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738738## When Claude uses tools
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