Poly: An MCP server for in-process linting across ~30 languages

Goldziher · reddit · 2026-08-30

The author released Poly, an MCP server for in-process linting and formatting across 30 languages. Unlike traditional shell calls, Poly compiles tools like Ruff and Biome into a single Rust binary. It exposes 11 tools, supports read/write operations, and optimizes output for agents (e.g., TOON format to save context). The project originated from the need to manage quality control in polyglot projects.

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