# NousResearch/hermes-agent · ACP flag probe fix to prevent subprocess hang

## Open now

- Nothing open on GitHub.

These items address a hang of roughly 600 seconds in delegate_task when the target CLI does not support the --acp flag. The proposed fix probes the CLI for --acp support before spawning the subprocess.

## TL;DR

- 3 member(s): 0 open issue(s), 1 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 #87709. Verify it addresses your case.
- **Recommended:** read PR #87709 (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-87709`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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.

## Closed / duplicate issues

- #87309: delegate_task hangs ~600s when target CLI rejects --acp (Claude Code v2.x, others)

## Prior & competing PRs

- **#87709: fix(acp): probe CLI for --acp support before spawning (salvage #87308)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `agent/copilot_acp_client.py`, `tests/agent/test_copilot_acp_client.py`
- **#87308: fix(acp): probe CLI for --acp support before spawning subprocess**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `#87709`, `#87309`

## Fix status

- Merged to main in PR #87709 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-08-16`.