# engineering-principles

Skill · `skill:engineering-principles`

Favz census, built 2026-10-04. Tool names and counts only. No repo names. HTML page: https://favz.co/tools/skill-engineering-principles.html

- Repos that have it now: 23
- Repos that ever had it: 23
- Still have it: 100%
- Share of census repos with any tool: 0.02%

## Repos with it, by month

From commit dates in each repo's history. The last few days always look low, because repos found later fill them in.

| Month | Repos at month end |
|---|---|
| 2026-03 | 1 |
| 2026-06 | 2 |
| 2026-07 | 19 |
| 2026-08 | 21 |
| 2026-09 | 23 |

## Goes with

Tools found in the same repos, ranked by lift: 3× means the two show up together three times as often as chance would give. Only pairs sharing 5 or more repos.

| Tool | Kind | Repos with both | Lift |
|---|---|---|---|
| [fastapi-backend](https://favz.co/tools/skill-fastapi-backend.md) | Skill | 17 | 2797.5× |
| [agent-orchestration](https://favz.co/tools/skill-agent-orchestration.md) | Skill | 17 | 1942.7× |
| [design-system](https://favz.co/tools/skill-design-system.md) | Skill | 17 | 103.6× |