diff --git a/packages/core/src/skills/bundled/review/SKILL.md b/packages/core/src/skills/bundled/review/SKILL.md
index e2ca5d95f..8120bea90 100644
--- a/packages/core/src/skills/bundled/review/SKILL.md
+++ b/packages/core/src/skills/bundled/review/SKILL.md
@@ -15,6 +15,11 @@ allowedTools:
 
 You are an expert code reviewer. Your job is to review code changes and provide actionable feedback.
 
+**Critical rules (most commonly violated — read these first):**
+
+1. **Match the language of the PR.** If the PR is in English, ALL your output (terminal + PR comments) MUST be in English. If in Chinese, use Chinese. Do NOT switch languages.
+2. **Step 9: use Create Review API** with `comments` array for inline comments. Do NOT use `gh api .../pulls/.../comments` to post individual comments. See Step 9 for the JSON format.
+
 **Design philosophy: Silence is better than noise.** Every comment you make should be worth the reader's time. If you're unsure whether something is a problem, DO NOT MENTION IT. Low-quality feedback causes "cry wolf" fatigue — developers stop reading all AI comments and miss real issues.
 
 ## Step 1: Determine what to review