A2a Trustgate

A2a Trustgate is a remote MCP server reached over the older SSE transport, at https://mcp.a2ainfrastructure.com/sse. Clients that support remote servers generally still accept SSE endpoints, though the protocol now favours Streamable HTTP.

The registry entry declares an HTTP header for the connection: Authorization (secret). A secret header usually carries an API key or token issued by the service; clients that accept custom headers set it with the server's URL.

It can also run locally from a Node.js package published to the npm registry: a2a-trustgate version 1.5.17. It speaks MCP over stdio, so the client starts it as a program and talks to it through standard input and output. It needs Node.js; clients usually start it with npx — the usual command is npx -y a2a-trustgate@1.5.17. It reads these environment variables: A2A_API_KEY (secret) and A2A_URL; set them in the client's configuration for this server.

In the mcpServers JSON format that many desktop and editor MCP clients read, the entry looks like this (placeholders in angle brackets):

{
  "mcpServers": {
    "a2a-trustgate": {
      "command": "npx",
      "args": [
        "-y",
        "a2a-trustgate@1.5.17"
      ],
      "env": {
        "A2A_API_KEY": "<secret>",
        "A2A_URL": "<value>"
      }
    }
  }
}

Derived from the registry entry, not tested here. What the server does, and on what terms, is set by its publisher; check its repository or website before giving it access to your accounts or files. How to add an MCP server to an assistant · Before you connect