Step 4 — the A2A agent card

Advanced Agentic Commerce: Ship the Full Agent Surface — lesson 6 of 20 (DEFINITION)

/.well-known/agent-card.json describes your agent to other agents: name, skills, endpoints, auth, and declared protocol extensions. Declare extensions with their canonical lowercase URIs — an undeclared extension reads as ‘found but not advertised’ and fails.

Source: A2A Protocol

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