export interface HttpToolConfig {
    method: "GET" | "POST" | "PUT" | "DELETE" | "PATCH";
    url: string;
    headers?: Record<string, string>;
    queryParams?: Record<string, string>;
    bodyTemplate?: Record<string, any> | string;
    /** Request timeout in milliseconds (default: 30 000). */
    timeoutMs?: number;
}
/**
 * Convert a wire-format HTTP tool config (snake_case from JSON callers)
 * to the internal camelCase `HttpToolConfig` interface.
 */
export declare function normalizeHttpToolConfig(raw: Record<string, any>): HttpToolConfig;
/**
 * Interpolate `{paramName}` placeholders in a string with values from params.
 * Unmatched placeholders are left as-is.
 */
export declare function interpolate(template: string, params: Record<string, any>): string;
/**
 * Create an async executor function for an HTTP-backed custom tool.
 * The returned function accepts tool parameters, interpolates them into
 * the HTTP config, makes the request, and returns the response body.
 *
 * Errors are returned as strings — the executor never throws.
 */
export declare function createHttpToolExecutor(httpConfig: HttpToolConfig): (params: Record<string, any>, externalSignal?: AbortSignal) => Promise<string>;