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
Optional ExperimentalauthUNSTABLE
This capability is not part of the spec yet, and may be removed or changed at any point.
Authentication-related capabilities supported by the agent.
OptionalloadWhether the agent supports session/load.
OptionalmcpMCP capabilities supported by the agent.
Optional ExperimentalnesUNSTABLE
This capability is not part of the spec yet, and may be removed or changed at any point.
NES (Next Edit Suggestions) capabilities supported by the agent.
Optional ExperimentalpositionUNSTABLE
This capability is not part of the spec yet, and may be removed or changed at any point.
The position encoding selected by the agent from the client's supported encodings.
OptionalpromptPrompt capabilities supported by the agent.
Optionalsession
Capabilities supported by the agent.
Advertised during initialization to inform the client about available features and content types.
See protocol docs: Agent Capabilities