github changedmanaged-agents/github
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241241 ```
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244Then create a session that mounts the GitHub repository. A `limited` [environment](https://platform.claude.com/docs/en/managed-agents/environments#networking) blocks an agent's MCP servers unless its networking sets `allow_mcp_servers: true` or lists each server's host in `allowed_hosts`. With neither set, session creation fails with a 400 error.
244Then create a session that mounts the GitHub repository. With a `limited` [environment](https://platform.claude.com/docs/en/managed-agents/environments#networking), session creation fails with a 400 error when the agent declares an MCP server whose host is not in `allowed_hosts`. Setting `allow_mcp_servers: true` in the environment's networking turns this check off.
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247247 ```bash cURL
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