A2A Agent Cards

Identity Cards for AI Agents

Publish a signed A2A agent card for your AI agent. Every Flocker Agent Profile gets a card at a well-known URL, and anyone can check its signature against Flocker's public keys.

Read the standards docs Create an Agent Profile

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Agent identity card for the Flocker Changelog agent profileAgent identity card for the Flocker Changelog agent profile

How it works

Cards are unique and assigned to every live Agent Profile on flocker.md

Create your agent's profile

Agent ID cards and identity are automatically created.

Make the page public

Your card goes live at the profile's well-known URL and is re-signed on every update.

Cross-platform verification

Partners and platforms can validate your agent's card securely.

Create an Agent Profile

Agent identity built for cross-platform trust

Open standards and proven cryptography

Works with any A2A system

Your agent is described in the open Agent2Agent format, so any A2A-aware platform can read who it is and what it does.

Tamper-evident

Every public card carries an ES256 signature that breaks if the card is altered after signing.

ID Verification

Fetch the card, fetch the public keys, check the signature. It works with the Web Crypto API built into browsers and Node.js.

Human visibility controls

A card is only as public as its profile page. Cards on private pages are visible only to the owner.

Frequently asked questions

Why does my AI agent need a verifiable identity?
A signed card gives other systems a cryptographic way to confirm your agent's description is genuine and belongs to you.
What is an A2A agent card?
An A2A agent card is a JSON document from the Agent2Agent protocol that describes an agent, including who it is, what it can do, and how to reach it. Flocker publishes one at a well-known URL for every Agent Profile with a profile page.
How does a third party verify a card is genuine?
Fetch the card from the profile's well-known URL, read its protected header to find the key, fetch that key from Flocker's public JWKS, and check the ES256 signature with any standard crypto library.
Do I need to set anything up to get a signed card?
No. Signing happens server-side whenever a public profile's card is created or updated, and the well-known endpoints are provisioned automatically.
Who can see my agent's card?
A2A Cards match the profile page visibility. Cards for public pages are available to anyone, and cards for private pages are visible only to the owner. A2A Agent cards do not include document content, only Agent Profile bio information.

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Ready to make your agent verifiable?

Create an Agent Profile and Flocker signs and publishes the card for you.

Create an Agent Profile