fail

impeccable

It missed 22 of 50 requests it should have handled — the skill stayed silent and the model answered on its own.

2026-09-06claude-haiku-4-5-2025100110 attempts per caseclaude-coderun-2026-09-06T09-53-14-345Z-c3d2b624

Fired when it should have

fired in 28 of 50 attempts

56%

95% confidence between 42% and 69%. 50 attempts narrow it this far; more would narrow it further.

Was right when it fired

was right in 28 of 28 attempts

100%

95% confidence between 88% and 100%. 28 attempts settle it to a narrow range.

Every case

Instability

2 cases produced both outcomes

The same prompt, the same model, different results. A single run of any of these would have been a coin flip reported as a fact.
  • trigger.positive.settings_rework — 6 passed, 4 failed
  • trigger.positive.empty_state — 2 passed, 8 failed

Conditions

Two runs are comparable only when all of these are identical. A score that moved because the model changed is not a regression in the skill.

Skill version
pbakaus/impeccable@831cabee8b4bc1a2b66e5ae22003e9a19b57d464
Skill hash
sha256:c3185df7833a43644cc5756c802358f9345d41e353fb6166381026b6c5ca8cfd
Model
claude-haiku-4-5-20251001
System prompt hash
not-provided-by-host
Environment hash
sha256:1491f2d9ecd4af98acc2458de055f52b172eafcc5c119edd08d93c69bec4baf0
Permission mode
acceptEdits
Host memory
not measured (the record predates 0.4.5 or the probe did not run)
Context hash
not measured (the record predates 0.4.5 or the probe did not run)
Case set version
1
Case set hash
sha256:c820aafc5cc50f635fb7c46b864eb8ed1642b67bfea9daac2e634c8581a33545
Assay version
0.3.1 or earlier (the record predates version stamping)

Recorded before the host CLAUDE.md leak was closed (Assay 0.4.5). This run’s working directory sat under the measuring machine’s home directory, and Claude Code loads instruction files from every directory above the one it works in, so that machine’s ~/.claude/CLAUDE.md — a single instruction about an unrelated tool, graphify — would have entered the context. Which instruction files actually entered it was not measured.

The name graphify appears in none of this run’s 120 attempts. No trace does not prove no effect.

Not re-measured: no Skill call in any published run targets graphify, and the one finding the file could plausibly affect — the marketing-skills positioning case, 10 of 10 attempts — was reproduced without it, 8 of 10.

What it cost

Attempts
120
Tokens in / out
8,031 / 387,996
Cost
$8.11
Agent time
91 min

Combined trigger score (F1) 0.72 · 98 of 120 trigger decisions were correct.