One file, one job, and short enough to hold in your head. Covers the size policy (hard-split over 300 lines, split 200 to 300 at a seam, aim for 150), what a natural seam is and where to cut, the exemptions, the dependency rules that decide where the split lands, and the signals that a file is already two files. Use before adding to a file that is already long, when naming a new file, when a function has nowhere obvious to live, or when a review says a file is doing too much. Triggers - "this file is too long", "where should this go", "split this file", "is this file too big", "one responsibility".

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What things get called. A file is named after its export in the project's case convention, a suffix is a resolution instruction rather than decoration, an index file only re-exports, and some symbol names are always wrong (utils, helpers, V2, Enhanced, New). Covers learning a tree's local vocabulary before adding to it, test and platform-variant naming, and the per-language conventions. Use when creating a file or directory, naming a test file, adding a platform variant, or when a name has to change. Triggers - "what should I call this file", "where does this file go", "naming convention", "kebab or camel", "name this test".

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Write a short release note people finish reading. Picks the few changes a user will notice from the pull requests since the last release, names each by what the reader can now do, keeps to a length budget, writes every language from the intent instead of translating, and traces every line to a PR. Use when cutting a release, or filling a GitHub Release body, a store "what's new", a package changelog or an in-app what's new screen. Triggers - "write the release notes", "release notes for 0.4.0", "what's new", "changelog for this release", "notes de version".

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Rust best practices. Use when reading or editing any .rs file, designing a crate's public API, choosing an error type, splitting a workspace, or writing async code on tokio. Triggers - "rust best practices", "is this idiomatic", "should this be a newtype", "anyhow or thiserror", "why does the borrow checker", "review this Rust".

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Write cargo tests. A test name is a sentence, the body is setup, mock, test and verify blocks separated by blank lines with no comments, and shared setup lives in a named test-support module rather than in each test. Covers naming, the block shape, where a test file goes, async and time, workspaces, and running one crate or one filter. Use when adding or changing any #[test] or #[tokio::test], or when Rust coverage has to come up. Triggers - "write a rust test", "cargo test", "test this crate", "cover this handler".

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Security guidance and vulnerability review for codebases, APIs, services, CLI tools, libraries, and daemons. Use for security questions, focused reviews, vulnerability research, security audits, or pen tests. Run the complete workflow only for explicit codebase audit or pen-test requests, full/comprehensive/end-to-end reviews, or requested report artifacts.

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