import type { RiskDecision } from "../safety/classifier.js";
import type { ToolResult } from "../types.js";
export interface ExternalToolCallOptions {
    readonly signal?: AbortSignal | undefined;
    readonly timeoutMs?: number | undefined;
}
export interface ExternalToolDispatcher {
    toolNames(): readonly string[];
    hasTool(name: string): boolean;
    callTool(name: string, args: Record<string, unknown>, options?: ExternalToolCallOptions): Promise<ToolResult>;
    canonicalizeToolName?(name: string): string;
    classify?(name: string): RiskDecision | undefined;
    isParallelSafe?(name: string): boolean;
    unavailableToolMessage?(name: string): string;
}
export declare function registerExternalToolDispatcher(dispatcher: ExternalToolDispatcher): () => void;
export declare function externalToolDispatcher(): ExternalToolDispatcher | undefined;
export declare function externalToolNames(): readonly string[];
export declare function isExternalToolName(name: string): boolean;
export declare function externalToolRisk(name: string): RiskDecision | undefined;
export declare function isExternalToolParallelSafe(name: string): boolean;
export declare function canonicalizeExternalToolName(name: string): string;