perf(hooks): desktop-lane measurements still open: typos-format per edit (B6), hook cancels after #6628 (B10), rate-limit readings across a rotation (B12) #6687

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   needs-triageNot yet classified. Floor until a type and one priority tier are set.Not yet classified. Floor until a type and one priority tier are set.

   on Oct 9, 2026
2. github-actions commented on Oct 9, 2026

   

   github-actionsBot

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   Thanks for the report. Automated triage handed this issue to a maintainer.

   _{Automated triage. A maintainer reviews it.}
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   needs-humanHuman-in-the-loop required; autonomous sessions must not resolve items carrying this.Human-in-the-loop required; autonomous sessions must not resolve items carrying this.

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   issue type on Oct 12, 2026
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   needs-triageNot yet classified. Floor until a type and one priority tier are set.Not yet classified. Floor until a type and one priority tier are set.

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6. kyle-sexton commented on Oct 13, 2026

   

   kyle-sexton

   on Oct 13, 2026

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   Decision recorded. The owner approved applying independently verified recommendations on 2026-10-12.

   • B10: does the harness delete an orphaned version directory while a live session references it? → no; it removes it 14 days after marking it orphaned (added by verification)
     Basis: https://code.claude.com/docs/en/plugins/loading 'Cleanup of previous versions' fetched 2026-10-12

   Three measurements from the 2026-10-08/09 audit (typos-format per-edit cost on native Windows, hook_cancelled counts after #6628, rate-limit readings across an account rotation) still need the desktop lanes. #6628 merged 2026-10-08, so B10 is now measurable.

   Verification notes:

   • route_reason 'only the owner can drive' is not true for B6 and B10: FLEET.md lists reach paths to both desktop lanes, and the user's instructions say to run what the agent can run.
   • owner_action omits B10's docs question, which the plugins loading doc already settles: an updated version's old directory is removed 14 days after the .orphaned_at marker, so a session that loaded it keeps running.
   • Assumption that both lanes run a build containing perf(harness-ops): run the per-session event log hook in the background #6628 is unverified; perf(harness-ops): run the per-session event log hook in the background #6628 is a harness-ops plugin change, so it depends on the lanes' plugin version, not the CLI build.

   Verified by an independent fresh-context check (doubtful, risk low): gh issue view 6687 (body; only triage comment, no measurements posted); gh pr view 6628: MERGED 2026-10-08T02:36:49Z; issue #6156 open; ~/.config/fleet/FLEET.md desktop endpoints; plugins/loading doc cleanup section

   Admission to an agent lane stays with the work-class rules and owner ratification.
7. kyle-sexton commented on Oct 25, 2026

   

   kyle-sexton

   on Oct 25, 2026

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   This was generated by AI during an unattended host run over /fleet:reach (melo-desk-001, both desktop lanes). Both lanes run harness-ops 4.4.0, which is later than #6628.

   B6: typos-format per-edit cost on native Windows

   Verdict: no change. The per-edit cost no longer exists. typos-format 0.11.4 registers only SessionStart and Stop hooks, so it runs once per turn, not once per edit.

   The measurement was one headless claude.exe -p --debug-file session (Claude Code 2.1.309, no concurrent agents). It made 18 separate Edit calls, 6 each to .md, .py and .txt, in a scratch git repository. Timings come from the debug log's Hooks: ... finished with status N (Nms) lines:

   Event	Plugin	n	p50 ms	p90 ms	max ms
   PreToolUse:Edit	guardrails	18	239	261	318
   PreToolUse:Edit	context-budget	18	53	60	68
   PostToolBatch	eol-normalizer	17	340	367	500
   PostToolBatch	markdown-format	17	78	381	388
   PostToolBatch	ruff-format	17	87	345	350
   PostToolBatch	biome-format	17	96	99	101
   PostToolBatch	go-format	17	73	81	85
   PostToolBatch	bash-format	17	61	65	69
   Stop (once)	typos-format	1	143

   The p90 spikes for markdown-format and ruff-format come from the edits to their own extensions. With concurrent agents was not measured: the old 917 ms figure belonged to a per-edit hook that no longer exists. guardrails' 239 ms PreToolUse:Edit is #4390's subject.
8. kyle-sexton commented on Oct 25, 2026

   

   kyle-sexton

   on Oct 25, 2026

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   This was generated by AI during an unattended host run over /fleet:reach (melo-desk-001, both desktop lanes). Both lanes run harness-ops 4.4.0, which is later than #6628.

   B10: hook cancels after #6628

   Verdict: no change. Cancels are rare on both desktop lanes. This is from one pass over the desktop OTEL hot store (the collector binds 127.0.0.1 only, so the store holds this machine's lanes alone) (hook_execution_complete events, num_cancelled), 2026-10-22 to 2026-10-24, Claude Code 2.1.305 to 2.1.310:

   Lane	hook events	hooks run	cancelled	events with a cancel	non-blocking errors
   desktop WSL	174,006	997,174	85 (0.009%)	29	3,192
   desktop Windows	179	2,272	0	0	0

   The WSL cancels by event: PreToolUse:Bash 41, PostToolUse:Bash 25, PostToolBatch 14, PostToolUseFailure:Bash 3, PreToolUse:Edit 2.

   • Not attributed per script. OTEL records counts per event, not per hook command. Before perf(harness-ops): run the per-session event log hook in the background #6628 the Windows lane logged 23 cancels in its sample. It now has none, but it saw little use in this window.
   • The harness-cleanup question is already settled by the 2026-10-12 decision comment.
   • The 3,192 non-blocking errors on WSL were not broken down here. That is the larger signal, if anyone wants a follow-up.

   B12

   Not measured: no account rotation happened during this run, and I didn't trigger one. This issue stays open for B12 alone.

   Outputs are kept locally under .work/host-runs/6687/.