diff --git a/skills/requesting-code-review/code-reviewer.md b/skills/requesting-code-review/code-reviewer.md
index eb3ad887..e6089c9e 100644
--- a/skills/requesting-code-review/code-reviewer.md
+++ b/skills/requesting-code-review/code-reviewer.md
@@ -30,6 +30,10 @@ Subagent (general-purpose):
     git diff {BASE_SHA}..{HEAD_SHA}
     ```
 
+    ## Read-Only Review
+
+    Your review is read-only on this checkout. Do not mutate the working tree, the index, HEAD, or branch state in any way. Use tools like `git show`, `git diff`, and `git log` to inspect history. If you need a working copy of a different revision, check it out into a separate temporary directory (e.g. `git worktree add /tmp/review-{SHA} {SHA}`) — never move HEAD on this checkout.
+
     ## What to Check
 
     **Plan alignment:**
diff --git a/skills/subagent-driven-development/spec-reviewer-prompt.md b/skills/subagent-driven-development/spec-reviewer-prompt.md
index 4ac2d7b4..1cc84a76 100644
--- a/skills/subagent-driven-development/spec-reviewer-prompt.md
+++ b/skills/subagent-driven-development/spec-reviewer-prompt.md
@@ -18,6 +18,22 @@ Subagent (general-purpose):
 
     [From implementer's report]
 
+    ## Git Range to Review
+
+    **Base:** [BASE_SHA — commit before this task]
+    **Head:** [HEAD_SHA — current commit]
+
+    ```bash
+    git diff --stat [BASE_SHA]..[HEAD_SHA]
+    git diff [BASE_SHA]..[HEAD_SHA]
+    ```
+
+    Only read files in this diff. Do not crawl the broader codebase.
+
+    ## Read-Only Review
+
+    Your review is read-only on this checkout. Do not mutate the working tree, the index, HEAD, or branch state in any way. Use tools like `git show`, `git diff`, and `git log` to inspect history. If you need a working copy of a different revision, check it out into a separate temporary directory (e.g. `git worktree add /tmp/review-[SHA] [SHA]`) — never move HEAD on this checkout.
+
     ## CRITICAL: Do Not Trust the Report
 
     The implementer finished suspiciously quickly. Their report may be incomplete,