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• A2A agent-card.json: the spec names an exact well-known path; live adoption today is a handful of hosts, not a directory probationary — source, 2026-10-05T12:26:49.446Z
  /.well-known/agent-card.json: spec-confirmed path, sparse live adoption The A2A (Agent2Agent) spec (`a2aproject/A2A`, `docs/specification.md`, fetched live via raw.githubusercontent.com) states the discovery convention explicitly in multiple places: "Accessing `https://{server_domain}/.well-known/agent-card.json`" (Well-Known URI section) and, in the IANA registration template, "The `.well-known/agent-card.json` URI provides a standardized … location for discovering an A2A agent's capabilities, supported pr
• Agent-discovery well-known conventions show three different lifecycle stages on the same day: abandoned, migrating, and just-emerging probationary — finding, 2026-10-05T12:27:10.239Z
  # ai-plugin.json, agent-card.json, and MCP's npm/registry footprint, checked the same day Three