Configuration File

MCPProxy uses a JSON configuration file located at ~/.mcpproxy/mcp_config.json.

Location

Platform	Default Location
macOS	~/.mcpproxy/mcp_config.json
Linux	~/.mcpproxy/mcp_config.json
Windows	%USERPROFILE%\.mcpproxy\mcp_config.json

Complete Reference

{
  "listen": "127.0.0.1:8080",
  "data_dir": "~/.mcpproxy",
  "api_key": "your-secret-api-key",
  "enable_socket": true,
  "tools_limit": 15,
  "tool_response_limit": 20000,
  "enable_code_execution": false,
  "code_execution_timeout_ms": 120000,
  "code_execution_max_tool_calls": 0,
  "code_execution_pool_size": 10,
  "features": {
    "enable_web_ui": true
  },
  "mcpServers": []
}

Options

Server Settings

Option	Type	Default	Description
listen	string	127.0.0.1:8080	Address and port to listen on
data_dir	string	~/.mcpproxy	Directory for data storage
api_key	string	auto-generated	API key for REST API authentication
enable_socket	boolean	true	Enable Unix socket/named pipe for local communication

Feature Flags

Option	Type	Default	Description
features.enable_web_ui	boolean	true	Enable the web management interface

Tool Discovery Settings

Option	Type	Default	Description
tools_limit	integer	15	Maximum tools to return in a single request
tool_response_limit	integer	20000	Maximum characters in tool response

Code Execution Settings

Option	Type	Default	Description
enable_code_execution	boolean	false	Enable JavaScript code execution tool
code_execution_timeout_ms	integer	120000	Execution timeout in milliseconds
code_execution_max_tool_calls	integer	0	Maximum tool calls (0 = unlimited)
code_execution_pool_size	integer	10	VM pool size for code execution

MCP Servers

See Upstream Servers for detailed server configuration.

Hot Reload

MCPProxy watches the configuration file for changes and automatically reloads when modifications are detected. No restart is required for most configuration changes.

Environment Variable Overrides

Configuration options can be overridden using environment variables. See Environment Variables for details.