Browse reusable Agent Skills, each with a clear purpose and practical guidance.
Develop and test Julia's Compiler.jl. Use when modifying Compiler/, debugging compiler behavior, or activating stdlib Compiler for reflection/native-codegen experiments instead of using sysimage Base.Compiler.
Modify Julia's external dependencies and JLLs — patches under deps/patches/, version bumps in deps/, and JLL updates. Use when touching deps/ or any *_jll folder, including refreshing checksums.
Develop and test JuliaSyntax and JuliaLowering in Julia's source tree. Use when modifying JuliaSyntax/ or JuliaLowering/, running package or targeted tests, or checking JuliaLowering execution.
Summarize a large Chrome DevTools performance trace into a compact markdown report so it can be reasoned about without loading the whole file. Use when given a Chrome/DevTools/Performance-panel trace (a multi-MB `Trace-*.json` or `*.json` with `traceEvents`) and asked to find what is slow, what runs too often, long tasks, jank, or hot JS functions.
Rebuild a package's unit test suite around a behavior specification (SPEC.md) derived from the implementation, with every test citing a numbered rule ID. Use when asked to do a spec-driven test rebuild, write a SPEC.md for a package, repeat the state or store spec process (PRs
Writing SDK documentation for tldraw. Use when creating new documentation articles, updating existing docs, or when documentation writing guidance is needed. Applies to docs in apps/docs/content/.
Update the release notes file at `apps/docs/content/releases/next.mdx` in the tldraw/tldraw repo based on PRs since the previous release, or archive `next.mdx` to a versioned file when a new version is published.