Cairn
NousResearch/hermes-agent

MCP stdio child liveness check logic inverted

Cluster 95395. Data as of

Nothing open on GitHub. Fix merged in #94339 on 27 Aug 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 #94339. Check it covers your case. No release data is tracked.
Tracker
The maintainers' tracker marks this unresolved. That is separate from the fix event.
Still open
Nothing open on GitHub.

A bug where MCP stdio tools always fail due to an inverted return value in the child-process liveness check, along with associated fix attempts addressing the same inversion.

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.

  • #94339 fix(mcp): un-invert the stdio children liveness check

    merged to main

    files: tests/tools/test_mcp_stdio_children_dead.py, tools/mcp_tool.py

1 PR closed without merging

From the close comments: done elsewhere 1

  • #95423 fix: correct MCP stdio child liveness check · done elsewhere → #94339
Closed issues · 1
  • Closed#95395[Bug]: MCP stdio tools always fail with "subprocess has exited" — _stdio_children_dead() return values are inverted
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(structural links throughout): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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
#94339
Closed issues
1
Attempts
1 PR closed without merging
Fix link checked
27 Aug 2026

For your agent

The same facts, typed.

cluster/95395.json
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