ExperimentalOptional_The _meta property is reserved by ACP to allow clients and agents to attach additional metadata to their interactions. Implementations MUST NOT make assumptions about values at these keys.
See protocol docs: Extensibility
The set of models that the Agent can use
The current model the Agent is in.
UNSTABLE
This capability is not part of the spec yet, and may be removed or changed at any point.
The set of models and the one currently active.