Agent Lint: open-source linter for Codex, AGENTS.md, MCP, Claude Code, and Cursor config

[zhupanov]

I’ve open-sourced Agent Lint, a linter for configuration used by Codex and other coding agents:

https://github.com/zhupanov/agent-lint

It validates things including:

.codex/ and .codex-plugin/
AGENTS.md
.agents/skills/
MCP configuration
Claude Code configuration
Cursor configuration

The project currently has ~300 lint rules, with a documented rule registry.

It supports configurable rule severity and suppression, running selected rules with --only, GitHub Actions integration, and prebuilt binaries for Linux and macOS. It’s implemented in Rust.

The motivation was pretty simple: agent configuration is becoming large and structured enough that it increasingly benefits from the same kind of automated validation we already expect for other parts of a software project.

I’d especially appreciate feedback from Codex users on:

configuration patterns I’m not covering yet
rules that would be useful for real-world Codex projects
false positives or cases where a rule is too opinionated
additional AGENTS.md or MCP checks worth adding

Issues and contributions are very welcome.