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Agent Commerce
Capabilities Manifest
A machine-readable declaration of what a system can do, exchanged before a transaction so the two sides agree on the available operations. UCP includes capability negotiation as a distinct stage between discovery and checkout; A2A uses signed Agent Cards to advertise an agent's capabilities and access method.
Why it matters
It is how an agent learns you support, say, partial refunds or scheduled delivery, without a human reading your policy page. A capability you do not declare effectively does not exist to an agent.
In practice
Usually generated by your platform. The check worth doing is whether what it declares matches what you actually honour, since a declared capability you cannot fulfil becomes a failed order.
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