# NousResearch/hermes-agent · MCP reconnect and cancellation error handling fixes

## Open now

- Nothing open on GitHub.

These issues and PRs address asyncio.CancelledError leaking or causing failures during MCP reconnection and discovery, particularly on Python 3.11+, plus a related CLI fix to catch BaseException on shutdown to suppress stray tracebacks.

## TL;DR

- 5 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 2 merged PR(s), 2 PR(s) closed without merging.
- A fix was merged to main in PR #21318. Verify it addresses your case.
- **Recommended:** read PR #21318 (and any competing PRs below) before filing. Confirm the merged change covers your symptom.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `resolved` · deciding PR(s): `pr-21276`. This is distinct from the fix status above. Weigh it yourself.

## How this cluster was grouped

- Link evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
- Pairwise link density `0.40`: the share of member pairs that carry a link, counting a structural link in full and a relevance-only link at 0.36. `1.00` means every pair is linked.

## Closed / duplicate issues

- #9930: MCP reconnect fails with asyncio.CancelledError on Python 3.11+

## Prior & competing PRs

- **#21318: fix(mcp): re-raise CancelledError explicitly in MCPServerTask.run**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `tests/tools/test_mcp_cancelled_error_propagation.py`, `tools/mcp_tool.py`
- **#9994: fix(mcp): handle asyncio.CancelledError in reconnect loop on Python 3.11+**. closed without merge
  - maintainer direction: category `implemented_elsewhere`; implication `superseded`; refs `e0a2b087681e98233e619ebbd073a9ee3d592295`, `#21318`, `#9930`
- **#10287: fix(mcp): clear stale thread interrupt before MCP discovery**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `46d1fc16ab`, `#21276`, `#9930`
- **#21276: fix(mcp): clear stale thread interrupt before MCP discovery**. merged to main
  - maintainer direction: category `merged`
  - files: `scripts/release.py`, `tools/mcp_tool.py`

## Fix status

- Merged to main in PR #21318 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-05-07`.
- Subsystem: `mcp`