diff --git a/SKILL.md b/SKILL.md
index 501e61a..c2d3186 100644
--- a/SKILL.md
+++ b/SKILL.md
@@ -42,6 +42,13 @@ Returns structured JSON with product data:
 - Variants/SKUs
 - Supplier info
 
+## Rules — MUST follow
+
+1. **Execute only, do not reason about internals.** Run the CLI command and return the output. Do NOT attempt to understand, debug, or bypass the scrape/query/polling logic inside the tool.
+2. **No fallback strategies.** If the command fails, report the error as-is. Do NOT try alternative approaches such as browser scraping, direct HTTP calls, or different API endpoints.
+3. **No retry loops.** If authentication or the scrape call fails, report the failure. Do NOT re-check configs, re-acquire tokens, or retry on your own.
+4. **Trust the tool's output.** The CLI handles session management, retries, and error formatting internally. Your job is to invoke it and relay the result — nothing more.
+
 ## Reference
 
 See [references/1688-product-master.md](references/1688-product-master.md).