NousResearch/hermes-agent

MCP stdio watchdog interfering with uvx and launcher-based servers

Cluster 66423. Data as of 2026-10-25 11:21 UTC

Nothing open on GitHub. Fix merged in #66858 on 18 Jul 2026. Check it covers your case.

open issues

open PRs

items grouped

Known?: Yes. 4 related items grouped here, 1 issue already closed.
Fix event: A fix was merged to main in PR #66858. Check it covers your case. No release data is tracked.
Tracker: The maintainers' tracker marks this resolved, deciding PR #66858. That is separate from the fix event.
Still open: Nothing open on GitHub.

Next step: read #66858, then check it covers your case.

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The members concern the MCP stdio watchdog and its handling of live servers, especially those started through launcher commands like uvx. One reports a bug where connections close after the handshake, and the others propose different approaches: using direct parent identity, skipping watchdog wrapping for launchers, or adding a disable option.

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.

#66858 fix(mcp): use direct parent identity in watchdogs — stop false-killing live stdio servers (#62505, #66518, #66423)

merged to main

files: contributors/emails/[redacted:email], tests/test_slash_worker_watchdog.py, tests/tools/test_mcp_stdio_watchdog.py, tools/mcp_stdio_watchdog.py, tools/mcp_tool.py, tui_gateway/slash_worker.py

2 PRs closed without merging

From the close comments: done elsewhere 1 · other 1

#66430 fix(mcp): skip watchdog wrapping for launcher commands (uvx, npx, etc.) (#66423) · other → #66858, #66423
#66805 fix(mcp): add disable_watchdog config option for uvx servers (#66423) · done elsewhere → #66858

Closed issues · 1

Closed#66423[Bug]: mcp_stdio_watchdog breaks uvx-based MCP servers — "Connection closed" after handshake

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(structural links throughout): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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 0.50: 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: #66858
Closed issues: 1
Attempts: 2 PRs closed without merging
Fix link checked: 18 Jul 2026

For your agent

The same facts, typed.

cluster/66423.json
cluster/66423.md