@aauth/mcp-stdio

@aauth/mcp-stdio

Stdio-to-HTTP proxy for MCP with AAuth signatures. Bridges a local stdio MCP client (like Claude Code) to a remote HTTP MCP server, signing all requests with AAuth.

Part of aauth-dev/packages-js. Protocol spec: dickhardt/AAuth.

Install

npm install @aauth/mcp-stdio

CLI

npx @aauth/mcp-stdio --server https://api.example.com/mcp --agent https://user.github.io

Options

Flag	Env var	Description
--server, -s	AAUTH_MCP_SERVER	Remote MCP server URL (required)
--agent, -a	AAUTH_AGENT_URL	Agent identity URL (required)
--delegate, -d	AAUTH_DELEGATE	Delegate name (default: claude)
--token-lifetime	AAUTH_TOKEN_LIFETIME	Agent token lifetime in seconds (default: 3600)

Claude Code Configuration

Add to your MCP server config:

{
  "mcpServers": {
    "my-server": {
      "command": "npx",
      "args": ["@aauth/mcp-stdio", "--server", "https://api.example.com/mcp", "--agent", "https://user.github.io"]
    }
  }
}

Or with environment variables:

{
  "mcpServers": {
    "my-server": {
      "command": "npx",
      "args": ["@aauth/mcp-stdio"],
      "env": {
        "AAUTH_MCP_SERVER": "https://api.example.com/mcp",
        "AAUTH_AGENT_URL": "https://user.github.io"
      }
    }
  }
}

API

bridgeTransports(local, remote): Promise<void>

Bridges two MCP transports for bidirectional message forwarding.

import { bridgeTransports } from '@aauth/mcp-stdio'

parseArgs(argv): StdioArgs

Parses CLI arguments with env var fallbacks.

import { parseArgs } from '@aauth/mcp-stdio'

const args = parseArgs(process.argv.slice(2))
// { serverUrl, agentUrl, delegate?, tokenLifetime? }

License

MIT