diff --git a/.claude/skills/review/SKILL.md b/.claude/skills/review/SKILL.md
new file mode 100644
index 00000000..5a7fbf26
--- /dev/null
+++ b/.claude/skills/review/SKILL.md
@@ -0,0 +1,42 @@
+---
+name: review
+description: Review a GitHub pull request; defaults to the current branch's PR when no number is given
+user-invocable: true
+argument-hint: "[#N]"
+allowed-tools: Bash, Read, Grep, Glob
+---
+
+# Review a Pull Request
+
+Review a GitHub PR. When no number is given, review the PR for the current branch.
+
+> For reviewing your uncommitted working diff instead, use `/code-review`.
+
+## Current Branch Context
+- Branch: !`git branch --show-current`
+- PR for this branch: !`gh pr view --json number,title,state,url --jq '"#\(.number) \(.title) [\(.state)] \(.url)"' 2>/dev/null || echo "none"`
+
+## Arguments
+- `$ARGUMENTS` - PR number to review (optional, e.g., `#42` or `42`).
+
+## Instructions
+
+1. **Resolve which PR to review:**
+  - If `$ARGUMENTS` contains a number, review that PR.
+  - Otherwise, use the current branch's PR shown in the context above.
+  - If neither yields a PR (no argument and the branch has no open PR), run `gh pr list` and ask the user which one to review. Do NOT guess.
+
+2. **Load the PR:**
+  ```bash
+  gh pr view <number> --json number,title,body,state,headRefName,baseRefName,url
+  gh pr diff <number>
+  ```
+
+3. **Review the diff** against this project's standards (see `.claude/CLAUDE.md` and `.claude/rules/`):
+  - Bash 3.0+ compatibility (no `declare -A`, `[[ ]]`, `${var,,}`, negative indexing, `&>>`)
+  - Tests exist and follow TDD; both success and failure paths covered
+  - Naming, namespacing (`bashunit::*` / `_private`), and dynamic-scope safety
+  - ShellCheck cleanliness and `shfmt` formatting
+  - CHANGELOG.md updated for user-facing changes
+
+4. **Report findings** grouped by severity (blocker / suggestion / nit), each as `path:line — problem. fix.`. No praise, no scope creep. State plainly if the PR looks good.