# FabricMC/yarn

Libre Minecraft mappings, free to use for everyone. No exceptions.

Repository: https://github.com/FabricMC/yarn
Canonical: https://ross.abutalabs.com/products/fabricmc-yarn
Language: Java
License: CC0-1.0
License Family: permissive
Topics: minecraft, modding, hacktoberfest, fabric
Last push: 2026-05-27T08:19:50+00:00

## Health v2 (maintenance only)
Score: 70/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 84, release rhythm 35, longevity 100
- inputs: {"age_days": 3673, "days_push": 98, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1222, forks 429 (observed 2026-08-28T04:04:02.503371+00:00)

## What it is
Yarn is a set of open, freely licensed (CC0) Minecraft mappings that translate obfuscated Minecraft class, method, and field names into readable names. It is developed with the Enigma tool and consumed via the Fabric Loom Gradle plugin for Minecraft modding.

## Use cases
- deobfuscate the Minecraft jar for reading its source code
- develop Minecraft mods with the Fabric toolchain
- browse readable names for Minecraft's obfuscated code in an IDE
- contribute improved mappings names to the community
- generate a named jar for decompilation

## When to choose
- you are building Fabric mods and need readable Minecraft names
- you want mappings with a fully permissive CC0 license
- you need to decompile and study Minecraft's code

## When to avoid
- you use a mod loader with its own mappings like MCP or Mojang's official obfuscation maps
- you need runtime tooling rather than static name mappings

## Facets
- artifact type: dataset
- maturity: active
- function: developer-tools, reverse-engineering, build-tool
- domain: gaming-tools, developer-tools
- platform: jvm, cross-platform
- tags: minecraft-mappings, fabric, modding, deobfuscation, enigma, cc0, minecraft

## Member repositories
- FabricMC/yarn (main) score 70

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:02.503371+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:15:36.180070+00:00, confidence not recorded.
  - readme: https://github.com/FabricMC/yarn (fetched 2026-08-28T04:04:02.503371+00:00, sha de56f1743e33)
- Data as of 2026-08-30T08:39:29.467469+00:00.