Mcp Gateway
Solo builders who wire Claude Code or Cursor to multiple MCP servers and want one policy-enforcing proxy so agents only call tools you explicitly allow.
Overview
AuthzX MCP Gateway is a Ship-phase MCP server that policy-enforces every tool call between your AI agent and downstream MCP servers.
What is this MCP server?
- Stdio MCP server (`@authzx/mcp-gateway` v1.0.1) that sits between your coding agent and downstream MCP servers
- Policy-enforcing proxy so tool discovery and invocation pass through AuthzX rules instead of direct wide-open MCP links
- npm-published package with `stdio` transport for Claude Code, Cursor, and other MCP-capable clients
- Requires `YOUR_API_KEY` (secret) at runtime for authenticated gateway operation
- Open-source repo at github.com/authzx/mcp-gateway with MCP server schema 2025-12-11
- Server version 1.0.1 per server.json
- One npm package: `@authzx/mcp-gateway` with stdio transport
- One required secret env var: `YOUR_API_KEY`
What problem does it solve?
Connecting agents straight to many MCP servers makes it hard to know which tools run, with what credentials, and whether a prompt can trigger something you never intended to allow.
Who is it for?
Builders who already use MCP in Claude Code or Cursor and want a single audited proxy before adding more third-party or internal MCP servers.
Skip if: Teams that only need one read-only MCP tool with no policy layer, or anyone looking for a domain server (browser, DB, payments) instead of security infrastructure.
What do I get? / Deliverables
After you register the gateway in your MCP client and supply `YOUR_API_KEY`, agent traffic flows through AuthzX policies so only approved MCP capabilities reach your backends.
- Single policy-checked MCP entry point between your agent and other MCP servers
- Authenticated gateway session gated by `YOUR_API_KEY`
- Clearer control surface for which downstream MCP tools agents may call
Recommended MCP Servers
Journey fit
AuthzX MCP Gateway is governance for production agent tooling: it belongs on the Ship shelf because its value is enforcing authorization before MCP tools run in real workflows, not authoring product features. Security is the canonical subphase for policy proxies, secret-gated access, and blocking over-privileged MCP tool calls between agents and backends.
How it compares
MCP authorization gateway and policy proxy—not an agent skill or a single-purpose integration server.
Common Questions / FAQ
Who is AuthzX MCP Gateway for?
It is for solo builders and small teams running Claude Code, Cursor, Codex, or similar MCP clients who need centralized policy control over which MCP tools agents can invoke.
When should I use AuthzX MCP Gateway?
Use it when you are adding or scaling MCP servers behind an agent and want enforcement at a proxy instead of trusting every connected server's full tool list.
How do I add AuthzX MCP Gateway to my agent?
Install `@authzx/mcp-gateway` from npm (v1.0.1), configure it as a stdio MCP server in your client, set the required secret `YOUR_API_KEY`, and route agent MCP traffic through the gateway to your downstream servers.