Agent Friendly Code

biomejs/biome

GitHub
https://github.com/biomejs/biome

A toolchain for web projects, aimed to provide functionalities to maintain them. Biome offers formatter and linter, usable via CLI and LSP.

Stars:
26k
Language:
Rust
Default branch:
main
Last scored:
Overall

At a glance

Rank
#92 of 401
Top 23% · #16 of 45 Rust repos
Checks passed
9 of 17
Full list below
Best set up for
Pi
Score 83.1
Needs most work for
Aider
Biggest fix: .aider.conf.yml (+14.1 pts)

What it has

What it's missing

What to fix first

Pick an AI agent

Showing fixes for Claude Code

  1. 1
    Pre-commit / git hooks
    Set up pre-commit (.pre-commit-config.yaml), husky, or lefthook to run format+lint on every commit.
    +5.3 pts
  2. 2
    Manageable size
    If possible, split into smaller modules or carve out a focused entry path. Document where to start in AGENTS.md.
    +5.3 pts
  3. 3
    Test suite
    Add a tests/ (or test/, __tests__/, spec/) directory with runnable tests. Document how to run them in AGENTS.md.
    +3.9 pts

Score for each AI agent

Each agent weighs the checks by its own docs. Under each score are its top three. How each agent is scored →

Pi
#73 of 401
83.1
  • ✓AGENTS.md / CLAUDE.md
  • ~Test suite
  • ✓Linter / formatter config
Codex
#79 of 401
83.0
  • ✓AGENTS.md / CLAUDE.md
  • ✓README
  • ~Test suite
Kimi Code CLI
#79 of 401
82.8
  • ✓AGENTS.md / CLAUDE.md
  • ~Test suite
  • ✓Dependency manifest
Claude Code
#112 of 401
81.6
  • ✓AGENTS.md / CLAUDE.md
  • ~Test suite
  • ✓Reproducible dev env
Devin
#93 of 401
78.0
  • ✓Reproducible dev env
  • ✓Dependency manifest
  • ~Test suite
Cursor
#82 of 401
75.5
  • ✗Cursor rules (.cursor/rules)
  • ✓README
  • ✓Type configuration
Gemini CLI
#84 of 401
74.2
  • ✗GEMINI.md
  • ✓README
  • ~Test suite
OpenHands
#112 of 401
71.7
  • ✓CI configuration
  • ✓Dependency manifest
  • ✓Reproducible dev env
Aider
#149 of 401
70.1
  • ✗.aider.conf.yml
  • ✓Linter / formatter config
  • ~Test suite

Does biomejs/biome have agent instructions?

An AGENTS.md (or CLAUDE.md) at the root tells AI coding agents how to build, test and work in the repo. A few agents also read a file of their own.

AGENTS.md / CLAUDE.md
AGENTS.md (new tab) · 5,171 characters
Agent-specific files
.agents/skills (new tab) (12 skills)No GEMINI.md, .cursor/rules, .openhands/setup.sh or .aider.conf.yml
Repos that have one
24 of 45 Rust repos · 221 of 401 repos on the leaderboard · See examples →

All 17 checks · 9 passed

Skills (.agents/skills)· 100% pass
12 skills in .agents/skills/
.agents/skills/biome-code-review/SKILL.md
AGENTS.md / CLAUDE.md· 100% pass
Substantive (5,171 characters)
AGENTS.md
.aider.conf.yml· 0% pass
No .aider.conf.yml at repo root
CI configuration· 100% pass
25 GitHub Actions workflows
.github/workflows
CONTRIBUTING guide· 100% pass
Guide present
CONTRIBUTING.md
Cursor rules (.cursor/rules)· 0% pass
No .cursor/rules/*.mdc or .cursorrules
Dependency manifest· 100% pass
Manifest present
package.json
Reproducible dev env· 100% pass
2 env artifacts (.devcontainer/devcontainer.json, justfile)
.devcontainer/devcontainer.json
GEMINI.md· 0% pass
No GEMINI.md at repo root
License file· 0% pass
No LICENSE/COPYING file
Linter / formatter config· 100% pass
Config detected
rustfmt.toml
.openhands/setup.sh· 0% pass
No .openhands/setup.sh
Pre-commit / git hooks· 0% pass
No pre-commit / husky / lefthook found
README· 100% pass
README detailed (11,390 characters)
README.md
Manageable size· 20% pass
10000+ files — very large
Test suite· 70% pass
Test files detected (crates/biome_cli/tests/snap_test.rs)
crates/biome_cli/tests/snap_test.rs
Type configuration· 100% pass
Typed language (Rust)

How biomejs/biome compares

vs leaderboard average
11.0 pts above
Average 66.8
vs Rust average
7.2 pts above
Average 70.6
Stars among Rust repos
#33 of 45

Missing here, and how many repos have it

  • License file · passed by 92% of leaderboard repos, 60% of Rust repos
  • Pre-commit / git hooks · passed by 29% of leaderboard repos, 20% of Rust repos
  • Cursor rules (.cursor/rules) · passed by 4% of leaderboard repos, 2% of Rust repos

Passes checks most repos miss

  • Skills (.agents/skills) · only 17% of repos pass it
  • Reproducible dev env · only 22% of repos pass it

One fix for the most agents: Pre-commit / git hooks would raise the score for all 9 agents, by up to 6.0 points.

Similar repos

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All Rust repos →

Same topics, any language

Repos tagged with the same GitHub topics, most shared first.

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Agent friendly score for github/biomejs/biome
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