Run Clang static analysis on Julia's C/C++ runtime and codegen, and satisfy the GC-rooting checker. Use after modifying runtime/codegen .c/.cpp files under src/ (excluding headers), before opening a PR.
Compare a Julia PR's Buildkite job durations against recent CI history (per-job mean/min/max over the last N days). Use when asked whether a PR slows down or speeds up CI, or to check a build's timings against the weekly baseline.
Run and update Julia tests after changing test files. Use when adding to or modifying any test file under test/ or stdlib/**/test/.
Fetch and inspect Julia Buildkite CI logs without web sign-in. Use when debugging Julia CI failures, reviewing Buildkite jobs, or when the Buildkite MCP is unavailable.
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.
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.
Write and verify Julia `jldoctest` code blocks. Use whenever adding or changing a `jldoctest` block in a docstring (base/, stdlib/, Compiler/) or under doc/, and before opening a PR that touches doctests.
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.