# NousResearch/hermes-agent · stdio MCP child death causes lifecycle busy-loop

## Open now

- Nothing open on GitHub.

A bug where a dead stdio child process causes the MCP lifecycle task to spin in a zero-timeout loop, along with multiple fix attempts targeting the spin behavior at and after the proof deadline.

## TL;DR

- 5 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 3 PR(s) closed without merging.
- A fix was merged to main in PR #115983. Verify it addresses your case.
- **Recommended:** read PR #115983 (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-115983`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #115483: \[Bug\]: Dead stdio MCP child causes zero-timeout lifecycle spin and starves gateway after 180s

## Prior & competing PRs

- **#115983: fix(mcp): a dead stdio child no longer spins the lifecycle loop after the proof deadline (#115483, salvage #115485)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`; implication `superseded`
  - files: `tests/tools/test_mcp_stdio_dead_reconnect.py`, `tools/mcp_tool_server_run.py`
- **#115485: fix(mcp): reconnect dead stdio child past proof deadline instead of spinning**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `#115983`, `#115983`, `#115983`
- **#115513: fix(mcp): eliminate zero-timeout spin when stdio child dies before proof**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `#115485`, `#115983`, `#115983`
- **#115657: fix(mcp): a dead stdio child no longer busy-loops the lifecycle task**. closed without merge
  - maintainer direction: category `implemented_elsewhere`; implication `superseded`; refs `55b6116b45`, `6fc43ca6ed`, `#115983`, `#115483`, `#115983`

## Fix status

- Merged to main in PR #115983 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-09-19`.