run • AI Agent SDK

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This is a method of the MCPToolRunner class in the mcp module.

Main thread function that processes MCP requests.

On Windows the stdio transport must spawn a child process (e.g. `npx) and talk to it over pipes. A non-main thread gets a SelectorEventLoop by default there, which does not support subprocesses and fails with an opaque fileno error during init (issue #5598). Use a dedicated ProactorEventLoop on Windows so subprocess stdio works; other platforms keep the standard asyncio.run` behaviour.

Signature

def run() -> Any

Returns

Uses

• platform.system
• asyncio.ProactorEventLoop
• asyncio.set_event_loop
• loop.run_until_complete
• loop.shutdown_asyncgens
• loop.shutdown_default_executor
• loop.close
• asyncio.run

Used By

• Agent.run_until
• MCPToolRunner.run
• run_health_checks
• GitRemoteSkillSource.fetch
• BaseTool.safe_run

Source