Claude Hook Config to suggest /code-review before opening a PR

code-review-before-PR.json

{
  "hooks": {
    "PreToolUse": [
      {
        "matcher": "Bash|mcp__github__create_pull_request",
        "hooks": [
          {
            "type": "command",
            "command": "input=$(cat); tool=$(printf \"%s\" \"$input\" | jq -r \".tool_name // \\\"\\\"\"); bash_cmd=$(printf \"%s\" \"$input\" | jq -r \".tool_input.command // \\\"\\\"\"); sid=$(printf \"%s\" \"$input\" | jq -r \".session_id // \\\"default\\\"\"); is_pr=0; [ \"$tool\" = \"mcp__github__create_pull_request\" ] && is_pr=1; { [ \"$tool\" = \"Bash\" ] && printf \"%s\" \"$bash_cmd\" | grep -Eq \"gh[[:space:]]+pr[[:space:]]+create\"; } && is_pr=1; if [ \"$is_pr\" = \"1\" ]; then marker=\"${TMPDIR:-/tmp}/claude-pr-review-suggested-${sid}\"; if [ ! -f \"$marker\" ]; then : > \"$marker\"; printf \"%s\" \"{\\\"hookSpecificOutput\\\":{\\\"hookEventName\\\":\\\"PreToolUse\\\",\\\"permissionDecision\\\":\\\"deny\\\",\\\"permissionDecisionReason\\\":\\\"Suggestion (not a hard gate): consider running /code-review on this branch before opening the PR, then re-issue the PR. You decide \u2014 if the change is trivial, already reviewed, or the user asked to skip review, just re-run the PR creation to proceed. This advisory fires only once per session.\\\"}}\"; fi; fi",
            "statusMessage": "Suggesting /code-review before PR\u2026"
          }
        ]
      }
    ]
  }
}