Tmux Detector Viability Verdict (tb-2ir)

Task

Record tmux detector viability verdict in decisions.md

What Was Done

Reviewed test results from child bead tb-1me and verified that the decision entry in docs/notes/decisions.md already contains comprehensive viability findings.

Entry Review

The existing "Tmux Detector Viability (2026-07-02)" section (lines 92-305) includes all required information:

✓ Verdict Stated Explicitly

VIABLE — Works as designed

✓ Quantitative Metrics

False positive rate: Low (30s quiet threshold, prompt pattern matching, hash-based comparison)
False negative rate: User-dependent (requires @tb- opt-in, non-standard prompts)
Performance impact: Minimal (2s poll interval, <50ms per cycle for 10 panes, negligible CPU)

✓ Tuning Parameters Documented

Parameter	Default	Configurable via
Quiet threshold	30000ms (30s)	`TRAILBOSS_QUIET_THRESHOLD_MS`
Poll interval	2000ms (2s)	`TRAILBOSS_POLL_INTERVAL_MS`
Opt-in prefix	`@tb-`	`TRAILBOSS_OPT_IN_PREFIX`
Prompt patterns	11 patterns	(code)

✓ Test Results Included

Test methodology documented
Execution time metrics (55.2s avg duration, 0.84s std deviation)
Accuracy analysis (100% detection accuracy, 0 false positives, 0 false negatives)
Failure mode analysis (test infrastructure issue, not detector defect)
Conclusions and recommendations

Changes Made

Added explicit reference to bead tb-1me in the test results section to link the decision to its source:

Line 191: Added "Source: Bead tb-1me — Tmux Detector Acceptance Test"

Conclusion

The tmux detector viability verdict is fully documented in docs/notes/decisions.md. The detector is production-ready with:

Low false positive rate (mitigated by threshold and pattern matching)
User-dependent false negative rate (acceptable for fallback)
Minimal performance impact (negligible CPU overhead)
Clear tuning parameters and production enablement instructions

Date: 2026-07-02 Parent bead: tb-2ir Child bead: tb-1me

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