# NousResearch/hermes-agent · ACP crashes when stdout is not a pipe

## Open now

- 1 issue, 0 PRs open on GitHub.
- #84515: \[Bug\]: hermes acp crashes with 'Pipe transport is only for pipes' when stdout is not a pipe

These members address a bug where the Hermes ACP crashes with a 'Pipe transport is only for pipes' error when stdout is not pipe-backed, along with proposed fixes to bridge or pump stdio in that scenario.

## TL;DR

- 3 member(s): 1 open issue(s), 0 closed issue(s), 0 open PR(s), 0 merged PR(s), 2 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #84515: \[Bug\]: hermes acp crashes with 'Pipe transport is only for pipes' when stdout is not a pipe

## Prior & competing PRs

- **#84540: fix(acp): bridge non-pipe stdout for ACP SDK connect_write_pipe**. closed without merge
  - maintainer direction: category `duplicate_of`; implication `duplicate`; refs `#84564`
- **#84564: fix(acp): pump stdio when stdout is not pipe-backed (#84515)**. closed without merge
  - maintainer direction: category `stale_abandoned`; implication `active`

## Fix status

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