mypy plugins

by Jamie Nelson

This skill should be used when the model needs to ensure code quality through comprehensive linting and formatting. It provides automatic linting workflows for orchestrators (format → lint → resolve via concurrent agents) and sub-agents (lint touched files before task completion). Prevents claiming "production ready" code without verification. Includes linting rules knowledge base for ruff, mypy, and bandit, plus the linting-root-cause-resolver agent for systematic issue resolution.

by Lauri Gates

Migration patterns - dual write, shadow mode, and automated tool migrations (mypy→ty, black→ruff-format, flake8→ruff, ESLint→Biome)

by Alberto Leal

ty — Astral's extremely fast (Rust) Python type checker and language server, in 0.0.x beta. Use when running or configuring `ty check`, reading ty diagnostics, setting rule levels in `[tool.ty]`/`ty.toml`, writing `# ty: ignore[rule]` suppressions, debugging environment or module-resolution failures, wiring ty into CI (exit codes, `--output-format github`), or migrating from mypy/pyright. Pinned to ty 0.0.72. The type checker — NOT ruff (lint/format) or uv (packaging).