# NousResearch/hermes-agent · MCP killpg self-termination bug fixes

## Open now

- Nothing open on GitHub.

Multiple fixes addressing a bug where killpg sends SIGTERM to the gateway's own process group during MCP shutdown or reload, causing the gateway to kill itself. Changes add guards to skip killpg when the child process shares the gateway's process group.

## 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 #51507. Verify it addresses your case.
- **Recommended:** read PR #51507 (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-51507`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #47134: fix(mcp): /reload-mcp crashes gateway via killpg sending SIGTERM to gateway's own process group

## Prior & competing PRs

- **#51507: fix(mcp): skip killpg when child shares gateway's process group (#47134)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`; implication `superseded`
  - files: `tests/tools/test_mcp_stability.py`, `tools/mcp_tool.py`
- **#47142: fix(mcp): guard killpg against sending SIGTERM to gateway own process group**. closed without merge
  - maintainer direction: category `duplicate_of`; implication `duplicate`; refs `#47152`, `#47134`, `#51507`
- **#47152: fix(mcp): guard killpg against gateway own process group SIGTERM**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `#47134`, `#47182`, `#51507`, `#51507`
- **#47182: fix(mcp): skip killpg when pgid matches gateway's own process group (#47134)**. closed without merge
  - maintainer direction: category `implemented_elsewhere`; implication `superseded`; refs `23c47371d23f7ff727c9430b5295ff8dd8622a13`, `#47134`, `#47134`

## Fix status

- Merged to main in PR #51507 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-06-23`.
- Subsystem: `mcp`