import { ZodType } from "zod";
export declare const TOOL_METADATA_KEY = "llm:tool";
export interface ToolMetadata {
    name: string;
    description: string;
    schema: ZodType;
    methodName?: string;
}
/**
 * Decorator that marks a method as a LangChain tool.
 * The method will have access to all injected dependencies via `this`.
 *
 * Tools are stored as an OBJECT keyed by method name, enabling individual access:
 * `this.lawTools.tools.findLawByName`
 *
 * @example
 * ```typescript
 * @Tool({
 *   name: "find_law_by_name",
 *   description: "Search for an Italian law by name",
 *   schema: z.object({ name: z.string() }),
 * })
 * async findLawByName({ name }: { name: string }) {
 *   return await this.lawRepository.findByLawName({ name });
 * }
 * ```
 */
export declare function Tool(metadata: ToolMetadata): MethodDecorator;
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