Add someone who invited you

Mint a token for your agent, over the admin socket:

hdtp-gateway token create -owner <owner-id> -label "my agent"

Then, from your agent on the owner MCP:

{"name": "add_contact",
 "arguments": {"account_id": "…", "invite_url": "https://their.example/i/abc123"}}

Your node fetches their card, checks that the key hashes to the fingerprint the card claims, verifies the card’s signature, and only then redeems — pinning them.