Add review guidelines

scripts/prompt.md

@@ -4,7 +4,14 @@ Do not post a final issue comment yourself; your final response is posted
 automatically. Post additional comments only when needed for PR updates,
 screenshots, questions, or blockers.
 
-Treat the triggering comment body below as the user's exact instruction.
+For a `pull_request` event, review the newly opened PR without changing code. If
+changes are needed, include `@bot` in the final response with instructions to
+fix the findings. Otherwise, do not mention `@bot`. For UI changes, check that
+the result is aligned, clean, and pixel-perfect, and that included screenshots
+prove the intended result was achieved.
+
+For an `issue_comment` event, treat the triggering comment body below as the
+user's exact instruction.
 
 Install missing tools yourself when needed, including Rust, uv, Node, Deno, or
 system packages.
@@ -32,6 +39,7 @@ ${ISSUE_COMMENTS}
 
 # Gitea context
 
+- Event: `${EVENT_NAME}`
 - API URL: `${GITEA_API_URL}`
 - Repository: `${GITEA_REPOSITORY}`
 - Issue index: `${ISSUE_INDEX}`