Claude Skills by trailofbits

Use when finishing a change and about to commit, push, or open a PR — to run a final closeout review on the working diff and decide what to fix WITHOUT scope-creeping the change into a refactor, migration, or redesign. Triggers: "review before I commit", "closeout review", "is this ready to ship", "self-review this branch", "what should I fix before the PR", running this on a loop over a branch.

Use when a change touches a logic-dense coop module (config, workspace, devcontainer, github_*, secret_store, fs_util, commands/*, model_state, jsonc) to run cargo-mutants correctly AND verify .cargo/mutants.toml was updated in the same PR. Triggers: "run mutation testing", "check mutants", "did I break the mutation baseline", before merging a change to a scoped module, before refactoring one.