openapi: 3.2.0 info: title: IAB Agentic Advertising .well Known API version: 0.1.0 description: 'Canonical wire protocol between the IAB Tech Lab buyer and seller agents: catalog, quote->book deal flow, negotiation, change requests, A2A (Agent-to-Agent protocol) JSON-RPC messaging, and Agent Card discovery.' tags: - name: .well Known paths: /.well-known/agent.json: get: operationId: getAgentCard summary: Agent Card for A2A discovery — the shared Agent primitive; ONE card schema for… responses: '200': description: The agent's card. content: application/json: schema: $ref: ../jsonschema/Agent.json tags: - .well Known