NousResearch/hermes-agent

Windows piped-stdout crash fixes and Kanban worker patches

Cluster 22445 · hermes cli. Data as of 2026-10-27 11:58 UTC

1 open item. Fix merged in #28330 on 19 May 2026. Check it covers your case.

open issues

open PR

items grouped

Known?: Yes. 8 related items grouped here, 3 issues already closed.
Fix event: A fix was merged to main in PR #28330. 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: 0 issues and 1 PR.

Next step: read #28330, then check it covers your case.

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Most members address a Windows-specific crash where prompt_toolkit raises NoConsoleScreenBufferError when stdout is redirected, with fixes falling back to plain print. A smaller cluster covers Kanban worker configuration and lane-dispatch behavior.

Open issues0

No open issues.

Open PRs1

PR#65811fix(cli): degrade _cprint to plain output when stdout has no console (fixes #65558)

Fixes on record

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

#28330 fix(windows): handle redirected stdout in _cprint fallback (#28083)

merged to main

files: cli.py

Show the diff

cli.py

@@ -1785,7 +1785,16 @@ def _cprint(text: str):
     # direct prompt_toolkit print is safe and matches existing behavior
     # (spinner frames, streamed tokens, tool activity prefixes, …).
     if app is None or not getattr(app, "_is_running", False):
-        _pt_print(_PT_ANSI(text))
+        try:
+            _pt_print(_PT_ANSI(text))
+        except Exception:
+            # Fallback when stdout is not a real console (e.g. subprocess
+            # worker logging to a file). prompt_toolkit raises
+            # NoConsoleScreenBufferError (Windows) or OSError (other).
+            try:
+                print(text)
+            except Exception:
+                pass
         return
 
     try:

3 PRs closed without merging

From the close comments: done elsewhere 1 · merged via another change 1 · stale or abandoned 1

#22482 fix(cli): fall back to plain print when prompt_toolkit has no Win32 console · merged via another change → #28330
#25556 fix(cli): handle NoConsoleScreenBufferError in _cprint on Windows · done elsewhere
#65850 fix(cli): plain-print fallback when stdout has no console — Windows piped/automated use (#65558) · stale or abandoned

Closed issues · 3

Closed#22445Windows: Kanban worker crashes with NoConsoleScreenBufferError when stdout is redirected
Closed#25535[Setup]: Hermes Kanban
Closed#65558prompt_toolkit crashes with NoConsoleScreenBufferError on Windows when `hermes chat -q` stdout is piped (non-interactive/automated use)

How this cluster was grouped

Link evidence (partly structural links): some members are connected by structural evidence (shared changed files, or a closing/superseded reference); the rest are joined by an automated relevance judgement over their text.
Members outside that structural core may belong to a different underlying problem.
Pairwise link density 0.20: 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

Subsystem: hermes cli
Merged PRs: #28330
Closed issues: 3
Attempts: 3 PRs closed without merging
Fix link checked: 19 May 2026

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