Update README.md

Author: zhjch05

README.md

@@ -1,24 +1,37 @@
 # MCP Server MetaTool
 
 ## Overview
-Metatool MCP Server
+
+Metatool MCP Server is a proxy server that joins multiple MCP servers and forward tool calls to the appropriate server.
+It can be used with [metatool-app](https://github.com/metatool-ai/metatool-app), the GUI tool manager for MCP which is also open source, together.
+
+## How it works
+- mcp-sever-metatool itself is both a MCP client and a MCP server
+- On startup, it connects to the metatool-app API to get a list of MCP servers to connect to
+- On `list_tools` call of MCP, it joins all tools from all MCP servers with namespace isolation.
+- On `call_tool` call of MCP, it forwards the call to the appropriate server.
+
 
 ## Installation
+
 Best way to use this is through uv
 A METATOOL_API_KEY environment variable must be set
+
 ```bash
-export METATOOL_API_KEY="my_api_key" # get from metatool-ai/metatool-app
+export METATOOL_API_KEY="my_api_key" # get from metatool-ai/metatool-app, which is self hostable and free
 uvx mcp-server-metatool
 ```
 
 You need a MCP Client to connect to this server to use it.
 
 ## Additional Configuration
+
 A METATOOL_API_BASE_URL environment variable can be set to point to another metatool instance
 
 ```bash
 export METATOOL_API_BASE_URL="http://localhost:12005"
 ```
 
 ## License
-Apache License 2.0
+
+Apache License 2.0