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Get Started Free →Full skill rewrite and improvement with versioned backups and templates. Use for major skill upgrades or user says evolve skill, upgrade SKILL.md. Use w henthe user needs this capability. Triggers: evolve skill, upgrade SKILL.md, improve skill file.
.claude/skills/stijnman-skill-evolver/SKILL.md| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-03 | ✗→✓ | ▲ Improved | -13% | 0% |
| case-07 | ✗→✓ | ▲ Improved | -67% | 0% |
| case-08 | ✗→✓ | ▲ Improved | -63% | 0% |
| case-09 | ✗→✓ | ▲ Improved | -65% | 0% |
| case-15 | ✗→✓ | ▲ Improved | -56% | 0% |
Read references/evolution-guide.md when setup, backends, or rubric details are needed.
skill-evolution-enginehyper-skill-testernatural-language-to-skill| Failure | Response | |---------|----------| | Broken frontmatter | Preserve the draft, show the local backup and rollback diff, and wait for user approval before restoring. |
Input: User request matching triggers above. Output: Structured result per workflow with integrations invoked as needed.
| Case | Status | Duration (ms) | Turns | Tokens | Tool calls | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Without | With | Δ | Without | With | Δ | Without | With | Δ | Without | With | Δ | ||
case-13 | pass→pass | 8,449 | 2,684 | -68% | 1 | 1 | 0% | 1,373 | 685 | -50% | 0 | 0 | — |
case-14 | pass→fail | 5,039 | 1,737 | -66% | 1 | 1 | 0% | 816 | 614 | -25% | 0 | 0 | — |
case-01 | fail→fail | 4,408 | 12,775 | +190% | 1 | 1 | 0% | 230 | 1,264 | +450% | 0 | 0 | — |
case-02 | fail→fail | 7,538 | 11,375 | +51% | 1 | 1 | 0% | 1,268 | 2,108 | +66% | 0 | 0 | — |
case-03 | fail→pass | 18,647 | 14,124 | -24% | 1 | 1 | 0% | 2,946 | 2,566 | -13% | 0 | 0 | — |
case-04 | pass→pass | 22,478 | 31,560 | +40% | 1 | 1 | 0% | 4,452 | 4,687 | +5% | 0 | 0 | — |
case-05 | pass→pass | 7,530 | 5,801 | -23% | 1 | 1 | 0% | 1,221 | 1,173 | -4% | 0 | 0 | — |
case-06 | fail→fail | 4,923 | 7,450 | +51% | 1 | 1 | 0% | 886 | 1,608 | +81% | 0 | 0 | — |
case-07 | fail→pass | 13,495 | 3,091 | -77% | 1 | 1 | 0% | 2,215 | 740 | -67% | 0 | 0 | — |
case-08 | fail→pass | 11,633 | 2,524 | -78% | 1 | 1 | 0% | 1,865 | 699 | -63% | 0 | 0 | — |
case-09 | fail→pass | 10,342 | 2,105 | -80% | 1 | 1 | 0% | 1,777 | 625 | -65% | 0 | 0 | — |
case-10 | pass→pass | 3,916 | 2,301 | -41% | 1 | 1 | 0% | 633 | 664 | +5% | 0 | 0 | — |
case-11 | fail→fail | 6,498 | 2,460 | -62% | 1 | 1 | 0% | 833 | 656 | -21% | 0 | 0 | — |
case-12 | fail→fail | 6,010 | 1,869 | -69% | 1 | 1 | 0% | 854 | 581 | -32% | 0 | 0 | — |
case-15 | fail→pass | 15,346 | 4,966 | -68% | 1 | 1 | 0% | 2,291 | 1,019 | -56% | 0 | 0 | — |
case-16 | fail→fail | 10,218 | 4,332 | -58% | 1 | 1 | 0% | 1,661 | 1,066 | -36% | 0 | 0 | — |
case-17 | pass→pass | 8,316 | 3,027 | -64% | 1 | 1 | 0% | 1,217 | 773 | -36% | 0 | 0 | — |
case-18 | pass→pass | 12,196 | 2,583 | -79% | 1 | 1 | 0% | 1,667 | 743 | -55% | 0 | 0 | — |
case-19 | fail→fail | 15,708 | 1,572 | -90% | 1 | 1 | 0% | 2,664 | 538 | -80% | 0 | 0 | — |
case-20 | pass→pass | 11,255 | 3,252 | -71% | 1 | 1 | 0% | 1,703 | 817 | -52% | 0 | 0 | — |
case-21 | fail→fail | 11,616 | 3,264 | -72% | 1 | 1 | 0% | 1,717 | 800 | -53% | 0 | 0 | — |
case-22 | fail→pass | 9,476 | 3,159 | -67% | 1 | 1 | 0% | 1,525 | 820 | -46% | 0 | 0 | — |
case-23 | pass→fail | 9,015 | 5,217 | -42% | 1 | 1 | 0% | 1,350 | 1,062 | -21% | 0 | 0 | — |
DecimalAI ran this skill against gemini-3.6-flash twice over the same eval suite — once with the skill loaded and once without — and compared the two runs case by case. 23 cases were attempted. The headline lift of +17 percentage points is the difference between those two pass rates over the 23 comparable cases. 2 cases got worse with the skill loaded, and they are included in that figure.
Without the skill loaded, the model failed this case. With it loaded, the same prompt on the same model passed. This is one improved case from the latest verified run; every case, including any that regressed, is in the table above.
Other measured skills in the registry, with their headline benchmark lift.