diff --git a/shared/global-instructions.md b/shared/global-instructions.md
index 7bb1fe1..4ca8626 100644
--- a/shared/global-instructions.md
+++ b/shared/global-instructions.md
@@ -4,4 +4,6 @@ This file is generated into client-specific instruction files. Do not edit gener
 
 __RULE_LOADING__
 
+Use MCP services only through the `mcporter` CLI. Do not invoke direct MCP tools or create, edit, or use native MCP connections, including `/mcp`. If MCPorter or its required server is unavailable, report that limitation instead of bypassing it.
+
 Main agent owns state and decisions. Delegate only for independent work where benefit exceeds context/tool cost. Use one implementer for contained work; subagents never spawn agents. Pass minimal context and verify handoffs.