NousResearch/hermes-agent

MCP stdio PATH resolution bug and fix

Cluster 125300. Data as of

Nothing open on GitHub. Fix merged in #132847 on 4 Oct 2026. Check it covers your case.

The short answer

0open issues
0open PRs
3items grouped
Known?
Yes. 3 related items grouped here, 1 issue already closed.
Fix event
A fix was merged to main in PR #132847. Check it covers your case. No release data is tracked.
Tracker
The maintainers' tracker marks this resolved, deciding PR #132847. That is separate from the fix event.
Still open
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.

Open issues0

No open issues.

Open PRs0

No open pull requests.

Fixes on record

Merged to main. A stamp counts the issues a fix is linked to.

  • #132847 fix(mcp): keep a bare stdio command on the user's PATH semantics [risk 0.30]

    merged to main

    files: tests/tools/test_mcp_tool_issue_948.py, tools/mcp_tool_config.py, tools/mcp_tool_discovery.py

1 PR closed without merging

From the close comments: done elsewhere 1

  • #125318 fix(mcp): keep a bare stdio command on the user's PATH semantics · done elsewhere → #132847
Closed issues · 1
  • Closed#125300[Bug]: Desktop serve --isolated puts bundled python first on MCP child PATH; bare 'python3' MCP servers die with 'Connection closed'
How this cluster was grouped
  • Link evidence (structural links throughout): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
  • Pairwise link density 0.67: the share of item 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.

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At a glance

Merged PRs
#132847
Closed issues
1
Attempts
1 PR closed without merging
Fix link checked
4 Oct 2026

For your agent

The same facts, typed.