mcp-log-proxy

## mcp-log-proxy [](https://archestra.ai/mcp-catalog/emicklei__mcp-log-proxy) `mcp-log-proxy` can be used to see the messages to and from a MCP client and a MCP server using a Web interface. Currently, it only supports the STDIO interface.  ### Multiple proxies  All running mcp-log-proxy processes will register themselves in `.mcp-log-proxy-instances.json` located in your home directory. On the web page, you can use the selector to switch to another proxy instance. ## install ```shell brew tap "emicklei/tap" ``` and then ```shell brew install emicklei/tap/mcp-log-proxy ``` or via Go ```shell go install github.com/emicklei/mcp-log-proxy@latest ``` ### usage `mcp-log-proxy` requires one argument `-command` that contains the full command line for starting the MCP server. For example, to proxy traffic to the `melrose-mcp` server, the full command is: mcp-log-proxy -command melrose-mcp This example assumes that both tools are available on your execution PATH. Once the proxy is started, messages can be viewed on `http://localhost:5656`. #### optional flags You can override the HTTP host address (default `localhost`) using the `host` flag, for example to listen on all interfaces or a specific interface address: mcp-log-proxy -command melrose-mcp -host 0.0.0.0 mcp-log-proxy -command melrose-mcp -host 1.2.3.4 You can override the Web page title using the `title` flag: mcp-log-proxy -command melrose-mcp -title "Melrōse (proxy)" You can override the HTTP port(default 5656) using the `port` flag: mcp-log-proxy -command melrose-mcp -port 9999 When running multiple proxies, the `mcp-log-proxy` will detect whether a HTTP port is taken and choose a different port instead. Using the Web UI you can select any of the other running proxies. You can override the log file location of the proxy that captures errors in the proxy itself using the `log` flag: mcp-log-proxy -command melrose-mcp -log /your/logs/mcp-log-proxy.log ### Claude examples This example proxies the use of the `melrose-mcp` server. Locate the binaries to get the correct paths. "melrōse": { "command": "/Users/SOME-USER/go/bin/mcp-log-proxy", "args": [ "-command", "/Users/SOME-USER/go/bin/melrose-mcp -log /Users/SOME-USER/Library/Logs/claude-melrose.log", "-log", "/Users/SOME-USER/Library/Logs/claude-melrose-proxy.log", "-port", "7788", "-title", "Claude Melrose MCP" ] }, Proxying the `browsermcp` server. "browsermcp": { "command": "/Users/SOME-USER/go/bin/mcp-log-proxy", "args": [ "-command", "npx @browsermcp/mcp@latest", "-log", "/Users/SOME-USER/Library/Logs/claude-browsermcp-proxy.log", "-port", "7799", "-title", "Claude Browser MCP" ] } ### Goose Example This example proxies the use of the `melrose-mcp` server. Locate the binaries to get the correct paths. ``` /Users/SOME-USER/go/bin/mcp-log-proxy -command /Users/SOME-USER/go/bin/melrose-mcp -log /Users/SOME-USER/Library/Logs/goose-melrose.log -port 8888 -title Melrose-MCP ``` ### Error information  © 2025, https://ernestmicklei.com. MIT License.