diff --git a/.github/workflows/code-review.yml b/.github/workflows/code-review.yml
index 88a7481..d02527a 100644
--- a/.github/workflows/code-review.yml
+++ b/.github/workflows/code-review.yml
@@ -36,6 +36,11 @@ jobs:
           PR_NUMBER: ${{ github.event.pull_request.number }}
           REPO: ${{ github.repository }}
 
+      - name: Checkout repository
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 1
+
       - uses: anthropics/claude-code-action@v1
         with:
           anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
@@ -67,7 +72,7 @@ jobs:
             Follow the guidelines in REVIEW.md if present.
           claude_args: |
             --model opus
-            --allowedTools "WebSearch,WebFetch,mcp__github_inline_comment__create_inline_comment,Bash(gh api:*),Bash(gh pr comment:*),Bash(gh pr diff:*),Bash(gh pr view:*),Bash(gh pr checks:*),Bash(git log:*),Bash(git blame:*),Bash(git diff:*),"
+            --allowedTools "Read,Glob,Grep,WebSearch,WebFetch,mcp__github_inline_comment__create_inline_comment,Bash(gh api:*),Bash(gh pr comment:*),Bash(gh pr diff:*),Bash(gh pr view:*),Bash(gh pr checks:*),Bash(git log:*),Bash(git blame:*),Bash(git diff:*),"
         env:
           GH_TOKEN: ${{ github.token }}
           ANTHROPIC_BASE_URL: ${{ vars.ANTHROPIC_BASE_URL }}