poly

Universal zero-dependency linter and formatter. One pure-Rust binary (poly) that lints and formats ~30 languages in-process — ruff, oxc, biome, mago and more compiled in — with a tree-sitter tier for the long tail. One config, git hooks, and an MCP server for agents.

{
  "mcpServers": {
    "poly": {
      "command": "cargo",
      "args": [
        "run",
        "--",
        "poly"
      ]
    }
  }
}

claude mcp add poly cargo run -- poly

{
  "mcpServers": {
    "poly": {
      "command": "cargo",
      "args": [
        "run",
        "--",
        "poly"
      ]
    }
  }
}