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Get Started Free →Execute this skill empowers AI assistant to construct recommendation systems using collaborative filtering, content-based filtering, or hybrid approaches. it analyzes user preferences, item features, and interaction data to generate personalized recommendations... Use when appropriate context detected. Trigger with relevant phrases based on skill purpose.
.claude/skills/jeremylongshore-building-recommendation-systems/SKILL.md| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-03 | ✓→✗ | ▼ Worse | 32% | 0% |
| case-09 | ✓→✗ | ▼ Worse | 93% | 0% |
| case-17 | ✓→✗ | ▼ Worse | 32% | 0% |
| case-04 | ✓→✓ | = Same ✓ | 7% | 0% |
| case-06 | ✓→✓ | = Same ✓ | 34% | 0% |
Build recommendation systems using collaborative filtering, content-based filtering, or hybrid approaches tailored to specific datasets and use cases.
design and implement recommendation systems tailored to specific datasets and use cases. It automates the process of selecting appropriate algorithms, preprocessing data, training models, and evaluating performance, ultimately providing users with a functional recommendation engine.
This skill activates when you need to:
User request: "Build a movie recommendation system using collaborative filtering."
The skill will:
User request: "Create a product recommendation engine for an online store, using content-based filtering."
The skill will:
This skill can be integrated with other Claude Code plugins to access data sources, deploy models, and monitor performance. For example, it can use data analysis plugins to extract features from raw data and deployment plugins to deploy the recommendation system to a production environment.
The skill produces structured output relevant to the task.
| Case | Status | Duration (ms) | Turns | Tokens | Tool calls | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Without | With | Δ | Without | With | Δ | Without | With | Δ | Without | With | Δ | ||
case-01 | fail→fail | 23,034 | 26,790 | +16% | 1 | 1 | 0% | 4,393 | 6,498 | +48% | 0 | 0 | — |
case-02 | fail→fail | 17,400 | 20,002 | +15% | 1 | 1 | 0% | 3,098 | 4,719 | +52% | 0 | 0 | — |
case-03 | pass→fail | 28,389 | 27,925 | -2% | 1 | 1 | 0% | 4,924 | 6,519 | +32% | 0 | 0 | — |
case-04 | pass→pass | 21,977 | 20,126 | -8% | 1 | 1 | 0% | 4,608 | 4,943 | +7% | 0 | 0 | — |
case-05 | fail→fail | 22,233 | 22,767 | +2% | 1 | 1 | 0% | 4,387 | 5,581 | +27% | 0 | 0 | — |
case-06 | pass→pass | 20,836 | 23,424 | +12% | 1 | 1 | 0% | 3,747 | 5,009 | +34% | 0 | 0 | — |
case-07 | pass→pass | 18,166 | 14,452 | -20% | 1 | 1 | 0% | 3,445 | 3,493 | +1% | 0 | 0 | — |
case-08 | fail→fail | 15,689 | 14,719 | -6% | 1 | 1 | 0% | 3,383 | 3,867 | +14% | 0 | 0 | — |
case-09 | pass→fail | 12,158 | 16,406 | +35% | 1 | 1 | 0% | 2,155 | 4,158 | +93% | 0 | 0 | — |
case-10 | pass→pass | 16,110 | 13,671 | -15% | 1 | 1 | 0% | 2,930 | 3,283 | +12% | 0 | 0 | — |
case-11 | pass→pass | 18,210 | 14,672 | -19% | 1 | 1 | 0% | 3,206 | 3,386 | +6% | 0 | 0 | — |
case-12 | pass→pass | 17,898 | 15,246 | -15% | 1 | 1 | 0% | 3,038 | 3,331 | +10% | 0 | 0 | — |
case-13 | pass→pass | 14,271 | 13,745 | -4% | 1 | 1 | 0% | 2,402 | 2,916 | +21% | 0 | 0 | — |
case-14 | pass→pass | 19,450 | 14,699 | -24% | 1 | 1 | 0% | 4,046 | 3,644 | -10% | 0 | 0 | — |
case-15 | pass→pass | 17,770 | 18,877 | +6% | 1 | 1 | 0% | 3,612 | 4,424 | +22% | 0 | 0 | — |
case-16 | pass→pass | 20,548 | 26,468 | +29% | 1 | 1 | 0% | 3,342 | 5,568 | +67% | 0 | 0 | — |
case-17 | pass→fail | 23,346 | 24,491 | +5% | 1 | 1 | 0% | 3,981 | 5,249 | +32% | 0 | 0 | — |
case-18 | pass→pass | 19,050 | 26,754 | +40% | 1 | 1 | 0% | 2,956 | 5,283 | +79% | 0 | 0 | — |
case-19 | pass→pass | 15,281 | 16,620 | +9% | 1 | 1 | 0% | 2,440 | 3,350 | +37% | 0 | 0 | — |
case-20 | pass→pass | 15,303 | 15,406 | +1% | 1 | 1 | 0% | 3,178 | 3,927 | +24% | 0 | 0 | — |
case-21 | pass→pass | 13,606 | 13,795 | +1% | 1 | 1 | 0% | 2,477 | 3,342 | +35% | 0 | 0 | — |
case-22 | pass→pass | 14,709 | 15,503 | +5% | 1 | 1 | 0% | 2,774 | 3,740 | +35% | 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 -50 percentage points is the difference between those two pass rates over the 22 comparable cases. 3 cases got worse with the skill loaded, and they are included in that figure.
Other measured skills in the registry, with their headline benchmark lift.