MCP Proxy

A thin MCP proxy. It allows clients to connect MCP servers via HTTP without streaming transport. It enables to put it on a simple infrastructure.

go install github.com/ubie-oss/mcp-proxy

Create a config file. The format is similar to Claude's.$VARNAMEwill be replaced with environment variables. It supports bothjsonandyaml.

{ "mcpServers": { "server1": { "command": "npx", "args": ["module1"], "env": { "VAR1": "$SERVER1_VAR1", "VAR2": "$SERVER1_VAR2" } }, "server2": { "command": "npx", "args": ["module2"], "env": { "VAR1": "$SERVER2_VAR1", "VAR2": "$SERVER2_VAR2" }, "_extensions": { "tools": { "allow": [ "tool1", "tool2" ], "deny": [ "tool11", "tool12" ] } } } } }

mcpServers: server1: command: "npx" args: - "module1" env: VAR1: $SERVER1_VAR1 VAR2: $SERVER1_VAR2 server2: command: "npx" args: - "module2" env: VAR1: $SERVER2_VAR1 VAR2: $SERVER2_VAR2 _extensions: tools: allow: - tool1 - tool2 deny: - tool11 - tool12

You can control which tools are available to each MCP server using the_extensions.toolsconfiguration:

- allow: Only tools listed here will be allowed. If this list is empty or not specified, all tools are allowed (unless denied).
- deny: Tools listed here will be blocked, even if they are in the allow list.

When bothallowanddenylists are specified, the deny list takes precedence. That is, tools in the deny list will be blocked even if they also appear in the allow list.

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