NousResearch/hermes-agent

Fix recursive error traversal in MCP connection errors

Cluster 111952. Data as of 2026-10-26 12:29 UTC

Nothing open on GitHub. Fix merged in #112200 on 16 Sep 2026. Check it covers your case.

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Known?: Yes. 3 related items grouped here, 1 issue already closed.
Fix event: A fix was merged to main in PR #112200. Check it covers your case. No release data is tracked.
Tracker: The maintainers' tracker marks this resolved, deciding PR #112200. That is separate from the fix event.
Still open: Nothing open on GitHub.

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These items address a RecursionError caused by unbounded traversal of cyclic exception chains when a stdio MCP server binary is missing. The fix bounds the nested connection error walk so the real underlying error is reported instead.

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Fixes on record

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

#112200 fix(mcp): hermes mcp test reports the real connect error instead of RecursionError on cyclic exception chains (#111952, #111997, salvage #111961)

merged to main

files: contributors/emails/[email protected], tests/tools/test_mcp_tool_errors.py, tests/tools/test_mcp_tool_session_expired.py, tools/mcp_tool_errors.py

1 PR closed without merging

From the close comments: merged via another change 1

#111961 fix(mcp): bound nested connection error traversal · merged via another change → 4b1215b, #112200

Closed issues · 1

Closed#111952hermes mcp test: RecursionError (unbounded exception-chain walk) when a stdio server's binary is missing

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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(structural links throughout): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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: #112200
Closed issues: 1
Attempts: 1 PR closed without merging
Fix link checked: 16 Sep 2026

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