OptionalterminalWhether the client supports terminal authentication methods.
Optional. Omitted or null both mean the client does not advertise support.
The client should supply {} only when it can reproduce the configured
agent invocation in an interactive terminal. Supplying {} means the
agent may include terminal entries in its authentication methods.
Optional_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
Authentication capabilities supported by the client.
Advertised during initialization to inform the agent which authentication method types the client can handle. This governs opt-in types that require additional client-side support.