Async Python Patterns

This skill focuses on practical asyncio patterns for I/O-bound concurrency.

Thread/process/subinterpreter parallelism and the GIL are python-performance / python-patterns concurrency.md.

When to activate

• You’re building an async service/client (HTTP, DB, queues, websockets)
• You need concurrency with limits (rate limiting, semaphores)
• You need safe cancellation and timeouts
• You suspect event loop blocking (sync call inside async path)
• A task is stuck: 3.14+ call-graph / python -m asyncio pstree

Rules of engagement