Tomorrow agents.txt hits its IETF expiry date. Nobody submitted a renewal.
11 Internet-Drafts filed for agent discovery, zero working group adoptions. MCP, A2A, and ACP each did their own thing outside IETF.
I think the answer is: validate everything. If your agent checks agents.txt, .well-known/mcp.json, and Agent Cards in one pass, you stop caring which draft survives.