mcp-use + APS authorization example

This standalone example puts the Agent Passport System aps-mcp-1 profile behind the existing mcp-use TypeScript middleware seam. A gateway proxies a vault_echo tool and verifies a signed, one-use authorization envelope before next() can reach the upstream server.

Run

npm install
npm test
npm run dev

Open the printed URL to use the built-in mcp-use Inspector.

1. Call issue_aps_demo_grant with a message.

2. Copy its structured result into vault_echo.

3. Run vault_echo; the APS middleware verifies the signature, target, argument hash, expiry, scope, and replay state before dispatch.

4. Run the same request again to see replay rejection before the upstream is called.

Related MCP server: SINT Protocol

Inspector compatibility

The APS MCP profile normally carries its envelope at:

tools/call.params._meta["org.agent-passport/authorization"]

The current Inspector form does not expose arbitrary per-call _meta. For interactive demonstration only, this repo accepts the identical envelope as the apsAuthorization tool argument, moves it into the namespaced _meta entry inside middleware, and removes it before forwarding. A production MCP client should send _meta directly.

This localhost demo also treats transport authentication as already established. Production code must configure OAuth and derive that fact from verified transport context (ctx.auth).

APS is an independent third-party project and is not part of MCP or mcp-use.