hoangnguyen0403/python-async-runtime
skills/python/python-async-runtime/SKILL.md
Write correct async Python runtime code with explicit blocking-I/O boundaries, cancellation, and timeout handling. Use when editing `asyncio` workflows, background loops, async services, or mixed sync/async integrations.
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Last scanned: Jun 30, 2026, 2:58 AM377.0s3 files scanned
SKILL.md
- name:
- python-async-runtime
- description:
- Write correct async Python runtime code with explicit blocking-I/O boundaries, cancellation, and timeout handling. Use when editing `asyncio` workflows, background loops, async services, or mixed sync/async integrations.
Python Async Runtime
Priority: P1 (HIGH)
Rules
- Keep blocking DB, subprocess, and legacy HTTP calls out of event-loop code.
- Use
asyncio.to_threadonly as an explicit boundary around blocking libraries. - Make timeout and cancellation behavior visible in the call path.
- Track long-lived tasks, cleanup, and retries deliberately.
Recipe
- Use async-native clients first.
- Wrap blocking calls once at the adapter seam.
- Propagate cancellation and timeout context instead of swallowing it.
- Separate poll loop logic from work-item processing.
- Test the timeout and error path, not only the happy path.
Anti-Patterns
- No direct blocking I/O inside
async def. - No hidden infinite loops without stop condition or observability.
- No broad
except Exceptionaround await chains that erases task state. - No orphan background tasks without lifecycle ownership.
References
- Framework Map
- Async Boundaries
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