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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Spawn the comment hunter, fix accepted findings, and offer encodings for claimed constraints.

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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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