# langchain-fundamentals

Skill · `skill:langchain-fundamentals`

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

- Repos that have it now: 28
- Repos that ever had it: 30
- Still have it: 93%
- Share of census repos with any tool: 0.03%

## 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 | 6 |
| 2026-04 | 11 |
| 2026-05 | 13 |
| 2026-06 | 18 |
| 2026-07 | 22 |
| 2026-08 | 23 |
| 2026-09 | 28 |

## 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 |
|---|---|---|---|
| [langgraph-fundamentals](https://favz.co/tools/skill-langgraph-fundamentals.md) | Skill | 27 | 2943.3× |
| [swarm](https://favz.co/tools/skill-swarm.md) | Skill | 10 | 913.3× |
| [web-design-guidelines](https://favz.co/tools/skill-web-design-guidelines.md) | Skill | 5 | 23.0× |
| [ui-ux-pro-max](https://favz.co/tools/skill-ui-ux-pro-max.md) | Skill | 5 | 12.9× |

## Comes in the same pack

5 tools almost never appear without this one. Most likely people copy them in together.

- [langgraph-persistence](https://favz.co/tools/skill-langgraph-persistence.md)
- [langchain-rag](https://favz.co/tools/skill-langchain-rag.md)
- [langchain-dependencies](https://favz.co/tools/skill-langchain-dependencies.md)
- [langchain-middleware](https://favz.co/tools/skill-langchain-middleware.md)
- [langgraph-human-in-the-loop](https://favz.co/tools/skill-langgraph-human-in-the-loop.md)