diff --git a/CLAUDE.md b/CLAUDE.md
index b3b1a5c..6fbf60d 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -129,3 +129,17 @@ Make sure you are on the right branch before doing any work.
 - Once the pull request has been created, wait for the GitHub Action checks to run and fix any issues they find.
 - Wait for GitHub Copilot to review your pull request and then use the GitHub GraphQL API to find all code suggestions, fix the issues and then resolve the threads.
 
+## Preview Verification
+
+Pull requests are checked by the `preview-verification.yml` workflow, which runs the [muffet](https://github.com/raviqqe/muffet) link checker against the per-PR preview site.
+
+### NEVER Add Muffet Exclusions Without Confirmation
+
+**NEVER add exclusions to `.github/workflows/preview-verification.yml` without first asking the user for confirmation using the AskUserQuestion tool.** Exclusions hide potential problems and should be deliberate decisions, not automatic fixes.
+
+Before proposing an exclusion, you MUST:
+1. Investigate the root cause of the failure
+2. Attempt to fix the actual problem (broken URL, missing anchor, etc.)
+3. If an exclusion is truly needed, use AskUserQuestion to explain the situation and get explicit approval
+4. Document why the exclusion is necessary in the commit message
+