EXIT Protocol + MCP: Portable AI Agent History

#ai #security #opensource #typescript

The Model Context Protocol (MCP) gives AI agents a standard way to use tools. The Passage Protocol gives them a standard way to record that they used those tools and moved on.

The Gap MCP Doesn't Fill

MCP standardizes how agents discover and call tools. But it doesn't track what happens when an agent finishes with a service and moves to the next one. There's no departure record, no audit trail.

The EXIT protocol fills that gap with signed departure markers.

The MCP Server

npm install @cellar-door/mcp-server

Your MCP-compatible agent gets:

exit_create: create a signed departure marker
exit_verify: verify an existing marker
entry_admit: verify a departure record and create an admission stamp

Configuration

{
  "mcpServers": {
    "passage-protocol": {
      "command": "npx",
      "args": ["@cellar-door/mcp-server"],
      "env": {
        "EXIT_ORIGIN": "did:web:myplatform.example"
      }
    }
  }
}