Agent Friendly Code

JetBrains/kotlin

GitHub
https://github.com/JetBrains/kotlin

The Kotlin Programming Language.

  • compiler
  • gradle-plugin
  • intellij-plugin
  • kotlin
  • kotlin-library
  • maven-plugin
  • programming-language
  • wasm
  • webassembly
Stars:
53.5k
Language:
Kotlin
Default branch:
master
Last scored:
Overall

At a glance

Rank
#197 of 401
Top 49% · #3 of 12 Kotlin repos
Checks passed
7 of 17
Full list below
Best set up for
Claude Code
Score 75.4
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
    Linter / formatter config
    Configure a linter/formatter (ESLint+Prettier, Biome, Ruff, rustfmt+clippy, golangci-lint) and commit the config.
    +7.9 pts
  2. 2
    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
  3. 3
    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

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 →

Claude Code
#168 of 401
75.4
  • ~AGENTS.md / CLAUDE.md
  • ✓Test suite
  • ~Reproducible dev env
Codex
#182 of 401
72.3
  • ~AGENTS.md / CLAUDE.md
  • ✓README
  • ✓Test suite
Kimi Code CLI
#175 of 401
71.6
  • ~AGENTS.md / CLAUDE.md
  • ✓Test suite
  • ✓Dependency manifest
Devin
#203 of 401
69.0
  • ~Reproducible dev env
  • ✓Dependency manifest
  • ✓Test suite
Pi
#206 of 401
68.3
  • ~AGENTS.md / CLAUDE.md
  • ✓Test suite
  • ✗Linter / formatter config
Gemini CLI
#195 of 401
64.7
  • ✗GEMINI.md
  • ✓README
  • ✓Test suite
OpenHands
#225 of 401
64.4
  • ✓CI configuration
  • ✓Dependency manifest
  • ~Reproducible dev env
Cursor
#202 of 401
64.0
  • ✗Cursor rules (.cursor/rules)
  • ✓README
  • ✓Type configuration
Aider
#253 of 401
60.1
  • ✗.aider.conf.yml
  • ✗Linter / formatter config
  • ✓Test suite

Does JetBrains/kotlin 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) · 234 characters
Agent-specific files
None: no GEMINI.md, .cursor/rules, .openhands/setup.sh, .aider.conf.yml or .agents/skills
Repos that have one
8 of 12 Kotlin repos · 221 of 401 repos on the leaderboard · See examples →

All 17 checks · 7 passed

Skills (.agents/skills)· 0% pass
No .agents/skills/<name>/SKILL.md
AGENTS.md / CLAUDE.md· 80% pass
File exists (234 characters)
AGENTS.md
.aider.conf.yml· 0% pass
No .aider.conf.yml at repo root
CI configuration· 100% pass
1 GitHub Actions workflow
.github/workflows
CONTRIBUTING guide· 100% pass
Guide present
docs/contributing.md
Cursor rules (.cursor/rules)· 0% pass
No .cursor/rules/*.mdc or .cursorrules
Dependency manifest· 100% pass
Manifest present
build.gradle.kts
Reproducible dev env· 70% pass
Has gradlew
gradlew
GEMINI.md· 0% pass
No GEMINI.md at repo root
License file· 100% pass
License present
license
Linter / formatter config· 0% pass
No linter/formatter config found
.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 (9,980 characters)
ReadMe.md
Manageable size· 20% pass
10000+ files — very large
Test suite· 100% pass
Found /tests
tests
Type configuration· 100% pass
Typed language (Java/Kotlin)

How JetBrains/kotlin compares

vs leaderboard average
1.0 pts above
Average 66.8
vs Kotlin average
9.9 pts above
Average 57.9
Stars among Kotlin repos
#1 of 12

Missing here, and how many repos have it

  • Linter / formatter config · passed by 65% of leaderboard repos, 8% of Kotlin repos
  • Pre-commit / git hooks · passed by 29% of leaderboard repos, 0% of Kotlin repos
  • Skills (.agents/skills) · passed by 17% of leaderboard repos, 8% of Kotlin repos

One fix for the most agents: Linter / formatter config would raise the score for all 9 agents, by up to 14.1 points.

Similar repos

Same language and host as this repo, closest in overall score.

All Kotlin repos →

Same topics, any language

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

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Agent friendly score for github/JetBrains/kotlin
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