# NousResearch/hermes-agent · Windows MCP stdio process tree cleanup

## Open now

- 1 issue, 0 PRs open on GitHub.
- #108084: Windows: MCP reconnect leaks stdio grandchildren — POSIX killpg reaper can't reach the cmd.exe/npx chain

These items address a Windows-specific issue where MCP stdio child processes and their descendants (e.g., cmd.exe/npx chains) are not fully terminated on disconnect or reconnect, because the POSIX-style process group reaper does not reach them. Proposed approaches involve Job Objects and explicit tree reaping.

## TL;DR

- 3 member(s): 1 open issue(s), 0 closed issue(s), 0 open PR(s), 1 merged PR(s), 1 PR(s) closed without merging.
- A fix was merged to main in PR #123003. Verify it addresses your case.
- **Recommended:** read PR #123003 (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: `unresolved`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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 `0.67`: 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.

## Open related issues

- #108084: Windows: MCP reconnect leaks stdio grandchildren — POSIX killpg reaper can't reach the cmd.exe/npx chain

## Prior & competing PRs

- **#123003: fix(mcp): kill Windows stdio MCP orphan trees (Job Object + tree reaping)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `hermes_cli/process_identity.py`, `tests/tools/test_mcp_windows_orphan_fix.py`, `tools/mcp_tool_lifecycle.py`, `tools/mcp_tool_transport.py`
- **#108093: fix(tools): reap Windows MCP stdio process trees**. closed without merge
  - maintainer direction: category `superseded_by_pr`; implication `superseded`; refs `0cd93f0268`, `#108084`, `#131331`, `#123003`

## Fix status

- Merged to main in PR #123003 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-09-27`.
- Subsystem: `mcp`