Improve error message when MCP server has no indexes

Clarify that the MCP server requires at least one index to operate
and provide the command to create an index. Applied to both stdio
and http subcommands.

Author: igor0

src/bin/cmd-mcp.ts

@@ -33,7 +33,9 @@ const stdioCommand = new Command("stdio")
         store = new FilesystemStore();
         indexNames = await store.list();
         if (indexNames.length === 0) {
-          console.error("No indexes found. Create an index first with 'context-connectors index'");
+          console.error("Error: No indexes found.");
+          console.error("The MCP server requires at least one index to operate.");
+          console.error("Create an index first: context-connectors index <path>");
           process.exit(1);
         }
       }
@@ -82,6 +84,13 @@ const httpCommand = new Command("http")
       } else {
         // No --index: use default store, serve all
         store = new FilesystemStore();
+        const availableIndexes = await store.list();
+        if (availableIndexes.length === 0) {
+          console.error("Error: No indexes found.");
+          console.error("The MCP server requires at least one index to operate.");
+          console.error("Create an index first: context-connectors index <path>");
+          process.exit(1);
+        }
         indexNames = undefined;
       }