import type { WorkflowActivityReason, WorkflowActivityState, WorkflowRootActivity } from "../../core/extensions/workflow-events.js";
export interface SessionActivity {
    state: WorkflowActivityState;
    reason: WorkflowActivityReason;
    message?: "Waiting for approval" | "Workflow needs attention";
}
export interface SessionActivityInput {
    agentRunning: boolean;
    tasksRunning?: boolean;
    openPromptCount: number;
    roots: readonly WorkflowRootActivity[];
    availability: "ready" | "recovering" | "unavailable";
}
export declare function deriveSessionActivity(input: SessionActivityInput): SessionActivity | undefined;
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