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Get Started Free →Master REST and GraphQL API design principles to build intuitive, scalable, and maintainable APIs that delight developers and stand the test of time.
.claude/skills/davila7-api-design-principles/SKILL.md| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-12 | ✗→✓ | ▲ Improved | -12% | 0% |
| case-01 | ✓→✓ | ＝ Same ✓ | 55% | 0% |
| case-21 | ✓→✓ | ＝ Same ✓ | -9% | 0% |
| case-02 | ✓→✓ | ＝ Same ✓ | 11% | 0% |
| case-03 | ✓→✓ | ＝ Same ✓ | 37% | 0% |
Master REST and GraphQL API design principles to build intuitive, scalable, and maintainable APIs that delight developers and stand the test of time.
Refer to resources/implementation-playbook.md for detailed patterns, checklists, and templates.
resources/implementation-playbook.md for detailed patterns, checklists, and templates.| Case | Status | Duration (ms) | Turns | Tokens | Tool calls | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Without | With | Δ | Without | With | Δ | Without | With | Δ | Without | With | Δ | ||
case-01 | pass→pass | 5,605 | 7,340 | +31% | 1 | 1 | 0% | 1,171 | 1,816 | +55% | 0 | 0 | — |
case-21 | pass→pass | 10,194 | 8,169 | -20% | 1 | 1 | 0% | 1,857 | 1,691 | -9% | 0 | 0 | — |
case-02 | pass→pass | 7,272 | 7,432 | +2% | 1 | 1 | 0% | 1,603 | 1,780 | +11% | 0 | 0 | — |
case-03 | pass→pass | 6,853 | 7,467 | +9% | 1 | 1 | 0% | 1,278 | 1,745 | +37% | 0 | 0 | — |
case-04 | pass→pass | 16,047 | 14,555 | -9% | 1 | 1 | 0% | 3,054 | 2,809 | -8% | 0 | 0 | — |
case-05 | pass→pass | 12,086 | 8,559 | -29% | 1 | 1 | 0% | 2,091 | 1,884 | -10% | 0 | 0 | — |
case-06 | pass→pass | 10,709 | 7,069 | -34% | 1 | 1 | 0% | 2,047 | 1,515 | -26% | 0 | 0 | — |
case-11 | pass→pass | 8,843 | 8,490 | -4% | 1 | 1 | 0% | 1,808 | 1,879 | +4% | 0 | 0 | — |
case-07 | pass→pass | 13,558 | 10,546 | -22% | 1 | 1 | 0% | 2,279 | 2,030 | -11% | 0 | 0 | — |
case-08 | pass→pass | 16,100 | 12,977 | -19% | 1 | 1 | 0% | 3,188 | 2,737 | -14% | 0 | 0 | — |
case-09 | pass→pass | 10,082 | 7,880 | -22% | 1 | 1 | 0% | 1,814 | 1,562 | -14% | 0 | 0 | — |
case-10 | pass→pass | 8,919 | 9,345 | +5% | 1 | 1 | 0% | 1,938 | 2,220 | +15% | 0 | 0 | — |
case-12 | fail→pass | 9,524 | 8,750 | -8% | 1 | 1 | 0% | 2,210 | 1,942 | -12% | 0 | 0 | — |
case-13 | pass→pass | 7,974 | 5,725 | -28% | 1 | 1 | 0% | 1,540 | 1,387 | -10% | 0 | 0 | — |
case-14 | pass→pass | 13,504 | 8,581 | -36% | 1 | 1 | 0% | 2,235 | 1,806 | -19% | 0 | 0 | — |
case-15 | pass→pass | 10,543 | 9,776 | -7% | 1 | 1 | 0% | 1,858 | 2,010 | +8% | 0 | 0 | — |
case-16 | pass→pass | 11,127 | 10,634 | -4% | 1 | 1 | 0% | 1,968 | 2,099 | +7% | 0 | 0 | — |
case-17 | pass→pass | 12,951 | 10,689 | -17% | 1 | 1 | 0% | 2,280 | 2,177 | -5% | 0 | 0 | — |
case-18 | pass→pass | 14,017 | 7,800 | -44% | 1 | 1 | 0% | 2,675 | 1,846 | -31% | 0 | 0 | — |
case-19 | pass→pass | 10,786 | 8,472 | -21% | 1 | 1 | 0% | 1,968 | 1,808 | -8% | 0 | 0 | — |
case-20 | pass→pass | 14,086 | 9,210 | -35% | 1 | 1 | 0% | 2,530 | 2,037 | -19% | 0 | 0 | — |
case-22 | pass→pass | 11,216 | 9,363 | -17% | 1 | 1 | 0% | 2,031 | 2,048 | +1% | 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. 22 cases were attempted. The headline lift of +5 percentage points is the difference between those two pass rates over the 22 comparable cases.
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.