path-filter

Git-compatible .gitignore parser and path filter for Python: library and streaming CLI, include/whitelist mode, shutil.copytree filter, memory-bounded for millions of paths. Ships as a Claude Code plugin too.

Finds monorepo CI path filters that miss a dependency — the ones that let a shared-package change ship without running the tests that would have caught it.

A GitHub Action that decides whether a workflow job should run based on which files changed, using include and ignore globs. Built for required-check workflows.