# NousResearch/hermes-agent · Copilot ACP subprocess leak on teardown

## Open now

- 1 issue, 2 PRs open on GitHub.
- #124835: \[Bug\]: Copilot ACP leaks native subprocesses on every model request
- PR #124850: fix(acp): terminate the whole Copilot process tree at session teardown
- PR #124851: fix(copilot-acp): reap the launcher's native descendant on teardown (#124835)

These items concern native subprocesses spawned by the Copilot ACP launcher not being properly cleaned up when a session or model request ends. The work involves reaping or terminating the full process tree at teardown to prevent leaks.

## TL;DR

- 3 member(s): 1 open issue(s), 0 closed issue(s), 2 open PR(s), 0 merged PR(s), 0 PR(s) closed without merging.
- No fix has been merged to main; one or more PRs were attempted (see below).
- **Recommended:** review the prior/competing PR(s) below. A fix was attempted but not merged; your case may extend or revive that work.

## 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #124835: \[Bug\]: Copilot ACP leaks native subprocesses on every model request

## Prior & competing PRs

- **#124850: fix(acp): terminate the whole Copilot process tree at session teardown**. open
  - maintainer direction: category `implemented_elsewhere`; implication `superseded`; refs `#124835`
  - files: `agent/copilot_acp_client.py`, `tests/agent/test_copilot_acp_client.py`
- **#124851: fix(copilot-acp): reap the launcher's native descendant on teardown (#124835)**. open
  - maintainer direction: category `silent_close`; implication `active`
  - files: `agent/copilot_acp_client.py`, `tests/agent/test_copilot_acp_client.py`

## Fix status

- No merged fix on record.
- Subsystem: `acp`