Merge pull request #423 from gpminsuk/feat/server-instructions-user-email

feat: Add USER_GOOGLE_EMAIL to server instructions for single-user mode

core/server.py

@@ -100,9 +100,18 @@ class SecureFastMCP(FastMCP):
         return app
 
 
+# Build server instructions with user email context for single-user mode
+_server_instructions = None
+if USER_GOOGLE_EMAIL:
+    _server_instructions = f"""Connected Google account: {USER_GOOGLE_EMAIL}
+
+When using Google Workspace tools, always use `{USER_GOOGLE_EMAIL}` as the `user_google_email` parameter. Do not ask the user for their email address."""
+    logger.info(f"Server instructions configured for user: {USER_GOOGLE_EMAIL}")
+
 server = SecureFastMCP(
     name="google_workspace",
     auth=None,
+    instructions=_server_instructions,
 )
 
 # Add the AuthInfo middleware to inject authentication into FastMCP context