Type configuration: static types help AI coding agents read code

How we score it

• Full pass: tsconfig.json, jsconfig.json, mypy.ini, pyrightconfig.json, or a [tool.mypy] or [tool.pyright] section in pyproject.toml.
• Full pass: a build file for a typed language, namely Rust, Go, Java, Kotlin, Scala, Swift, C#, OCaml, Haskell or Zig.
• Fail: neither. A typed language whose build file we do not look for, such as C or C++, also fails.

The methodology has the formula that turns checks into a score.

How to pass

For TypeScript or JavaScript, commit a tsconfig.json or jsconfig.json. For Python, add mypy or Pyright and commit its config. Other typed languages pass once their build file is at the repo root.

Which agents count it most

• Cursor12% of its score
• Gemini CLI10% of its score
• GPT-5 Codex9% of its score
• Pi8% of its score
• Kimi CLI8% of its score
• Claude Code8% of its score
• Aider7% of its score
• Devin6% of its score
• OpenHands5% of its score

Pass rate by language

• Rust43 of 44 (98%)
• Go34 of 37 (92%)
• Java25 of 28 (89%)
• C#6 of 7 (86%)
• JavaScript12 of 16 (75%)
• Swift6 of 8 (75%)
• TypeScript55 of 81 (68%)
• Ruby6 of 9 (67%)
• Python33 of 57 (58%)
• C++5 of 18 (28%)
• C2 of 8 (25%)
• Dart1 of 7 (14%)
• PHP0 of 10 (0%)
• Elixir0 of 7 (0%)