Add descriptions for tools required by Bedrock (ClickHouse#23)

Addresses ClickHouse#22

Author: kapustor

mcp_timeplus/mcp_server.py

@@ -41,6 +41,7 @@
 
 @mcp.tool()
 def list_databases():
+    """List available ClickHouse databases"""
     logger.info("Listing all databases")
     client = create_timeplus_client()
     result = client.command("SHOW DATABASES")