import type { ExternalToolExecutionContext, ExternalToolProvider, ExternalToolSearchHit, ExternalToolSource, VersionedExternalToolDescriptor } from './types.js';
export declare class ExternalToolService {
    private readonly providerBySource;
    private readonly ajv;
    constructor(providers: ExternalToolProvider[]);
    search(params: {
        query: string;
        sources?: ExternalToolSource[];
        limit?: number;
    }): Promise<{
        tools: ExternalToolSearchHit[];
        unavailableSources: ExternalToolSource[];
    }>;
    describe(toolRefs: string[]): Promise<{
        tools: VersionedExternalToolDescriptor[];
        notFound: string[];
    }>;
    execute(params: {
        toolRef: string;
        revision: string;
        arguments?: Record<string, unknown>;
        approvalId?: string;
        context: ExternalToolExecutionContext;
    }): Promise<import("@earendil-works/pi-agent-core").AgentToolResult<Record<string, unknown>>>;
    private providerForRef;
}