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
OptionalfsFile system capabilities supported by the client. Determines which file operations the agent can request.
OptionalterminalWhether the Client support all terminal* methods.
Capabilities supported by the client.
Advertised during initialization to inform the agent about available features and methods.
See protocol docs: Client Capabilities