# NousResearch/hermes-agent · MCP stdio PATH resolution bug and fix

## Open now

- Nothing open on GitHub.

A bug where Desktop's isolated mode places bundled Python first on the PATH causes bare stdio MCP server commands to fail with 'Connection closed'. The members cover the bug report and a corresponding fix to preserve correct PATH semantics for bare commands.

## 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 #132847. Verify it addresses your case.
- **Recommended:** read PR #132847 (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-132847`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #125300: \[Bug\]: Desktop serve --isolated puts bundled python first on MCP child PATH; bare 'python3' MCP servers die with 'Connection closed'

## Prior & competing PRs

- **#132847: fix(mcp): keep a bare stdio command on the user's PATH semantics \[risk 0.30\]**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `tests/tools/test_mcp_tool_issue_948.py`, `tools/mcp_tool_config.py`, `tools/mcp_tool_discovery.py`
- **#125318: fix(mcp): keep a bare stdio command on the user's PATH semantics**. closed without merge
  - maintainer direction: category `implemented_elsewhere`; implication `superseded`; refs `#132847`

## Fix status

- Merged to main in PR #132847 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-10-04`.