import type { ModelMessage } from "ai";
import { ContextKey } from "#context/key.js";
import type { ResolvedToolDefinition } from "#runtime/types.js";
import type { JsonObject } from "#shared/json.js";
/**
 * Single item in the todo list.
 */
export interface TodoItem {
    readonly content: string;
    readonly priority: "high" | "medium" | "low";
    readonly status: "pending" | "in_progress" | "completed" | "cancelled";
}
/**
 * Durable state for the framework todo tool.
 */
export interface TodoState {
    readonly items: readonly TodoItem[];
}
export declare const TodoStateKey: ContextKey<TodoState>;
/**
 * Typed input accepted by {@link executeTodoTool}.
 *
 * When `todos` is provided, the list is replaced (full replacement write).
 * When `todos` is omitted, the current list is returned without modification.
 */
export interface TodoToolInput {
    readonly todos?: readonly TodoItem[];
}
/**
 * Builds the message that re-injects the current todo list after the harness
 * compacts message history, so the agent keeps its task list across
 * compaction. Returns `undefined` when there is no list to preserve.
 */
export declare function getTodoCompactionMessage(): ModelMessage | undefined;
/**
 * Executes the framework todo tool.
 *
 * - Read: omit `todos` → returns the current list.
 * - Write: provide `todos` → replaces the entire list, returns the new list.
 *
 * Both paths return the same formatted output so the model always sees
 * the full current state.
 */
export declare function executeTodoTool(input: TodoToolInput): unknown;
export declare const TODO_OUTPUT_SCHEMA: JsonObject;
export declare const TODO_TOOL_DEFINITION: ResolvedToolDefinition;