tools changedmanaged-agents/tools
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678678Each custom tool defines a contract: you specify what operations are available and what they return, and Claude determines when and how to call them. The model never executes anything on its own. It emits a structured request, your code runs the operation, and the result flows back into the conversation. See [Session event stream](https://platform.claude.com/docs/en/managed-agents/events-and-streaming#handling-custom-tool-calls) for how to receive custom tool calls and return results during a session.
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680If your sessions run in a self-hosted sandbox, the environment worker can [serve custom tools from your sandbox](https://platform.claude.com/docs/en/managed-agents/self-hosted-sandboxes#serve-custom-tools-from-your-sandbox), including tools that wrap an MCP server inside your network.
680If your sessions run in a self-hosted sandbox, the environment worker can [serve custom tools from your sandbox](https://platform.claude.com/docs/en/managed-agents/self-hosted-sandboxes-custom-tools), including tools that wrap an MCP server inside your network.
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682682<CodeGroup defaultLanguage="CLI">
683683 ```bash cURL
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