ACP v2 TypeScript SDK — UNSTABLE DRAFT - v2.0.0
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    Type Alias SessionSystemPromptModeCapabilitiesExperimental

    UNSTABLE

    This capability is not part of the spec yet, and may be removed or changed at any point.

    System prompt delivery modes the agent supports in addition to append.

    append has no entry because every agent advertising session.systemPrompt supports it.

    type SessionSystemPromptModeCapabilities = {
        override?: SessionSystemPromptOverrideCapabilities | null;
        _meta?: { [key: string]: unknown } | null;
    }
    Index
    override? _meta?
    override?: SessionSystemPromptOverrideCapabilities | null

    Whether the agent supports override mode.

    Optional. Omitted or null both mean the agent does not advertise support. Supplying {} means the agent supports replacing its built-in default instructions with the client-provided system prompt.

    Optional_meta

    _meta?: { [key: string]: unknown } | null

    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

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