self-hosted-sandboxes-custom-tools changedmanaged-agents/self-hosted-sandboxes-custom-tools
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197The worker answers only the tools registered with it. If a tool is declared on the agent but no worker or client serves it, the session pauses with a `requires_action` stop reason. It stays paused until something posts the result. See [Handling custom tool calls](https://platform.claude.com/docs/en/managed-agents/events-and-streaming#handling-custom-tool-calls) for the event flow.
197The worker answers only the tools registered with it. If a tool is declared on the agent but no worker or client serves it, the session pauses with a `requires_action` stop reason. It stays paused until something posts the result. See [Answer tool calls that pause the session](https://platform.claude.com/docs/en/managed-agents/events-and-streaming#answer-tool-calls-that-pause-the-session) for the event flow.
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199199## Wrap an MCP server as custom tools
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