Mock AI Agents

Mocking an AI agent means simulating its interface and behavior — its A2A agent card, skills, and responses — so you can build and test agent-to-agent (A2A) integrations before the real agent is deployed. In A²D you design an agent card with reusable skills, mock its behavior with configurable scenarios, try it live in the playground, and run automated test suites against it across environments.

What an agent mock includes

An A²D agent mock reproduces what a calling agent or client would interact with:

• Agent card — the A2A descriptor: identity, capabilities, and skills.
• Skills — reusable, invocable units of agent behavior.
• Scenarios — mocked responses per skill for success and failure paths.
• Protocol versions — target the A2A wire format your consumers expect.

Design, mock, try

The workflow mirrors MCP mocking, applied to agents:

• Design the agent card and add its skills.
• Add mock scenarios for each skill so behavior is deterministic.
• Try the agent live in the Protocol Tester playground.
• Point a real A2A client at the mock endpoint to develop against it.

{
  "skill": "summarize_ticket",
  "scenario": "success",
  "output": {
    "summary": "Customer reports login failures after password reset.",
    "priority": "high",
    "suggestedTeam": "identity"
  }
}

Signed agent cards

For integrations that require trust, A²D can mock and serve signed agent cards so consumers can validate the signature exactly as they would in production. See Signed agent cards.

Test agents automatically

Move from interactive checks to repeatable coverage:

• Build suites that invoke skills and assert on agent responses.
• Run across Mock, Pre-prod, and Prod environments.
• Track which skills and scenarios are covered.

Next Steps

• Creating agent cards - Build an A2A agent card
• Design-first agents - Define agent behavior up front
• Protocol versions - Target the right A2A wire format
• Real-world mocking for MCP and agents - The full workflow

Mock the agent before you build against it — deterministic A2A integrations from day one. 🤖