import type { ToolModelOutput, ToolModelOutputPart } from "#shared/tool-definition.js";
/**
 * Builders for the model-facing {@link ToolModelOutput} returned by
 * `toModelOutput`. Pure sugar over the union — each returns the
 * corresponding literal, and hand-written literals remain valid.
 *
 * ```ts
 * toModelOutput(output) {
 *   return toolOutput.content([
 *     toolOutputPart.text(`Screenshot of ${output.path}:`),
 *     toolOutputPart.file(output.screenshotBase64, { mediaType: "image/png" }),
 *   ]);
 * }
 * ```
 */
export declare const toolOutput: {
    /** Builds a text output: the model sees `value` as the tool result. */
    text(value: string): ToolModelOutput;
    /** Builds a JSON output; `value` must be JSON-serializable. */
    json(value: unknown): ToolModelOutput;
    /** Builds a content output from ordered {@link ToolModelOutputPart} entries. */
    content(value: readonly ToolModelOutputPart[]): ToolModelOutput;
};
/**
 * Builders for `content` {@link ToolModelOutput} parts. Pure sugar over
 * {@link ToolModelOutputPart} — each returns the corresponding part
 * literal, and hand-written literals remain valid.
 *
 * ```ts
 * toModelOutput(output) {
 *   return {
 *     type: "content",
 *     value: [
 *       toolOutputPart.text(`Screenshot of ${output.path}:`),
 *       toolOutputPart.file(output.screenshotBase64, { mediaType: "image/png" }),
 *     ],
 *   };
 * }
 * ```
 */
export declare const toolOutputPart: {
    /** Builds a text part. */
    text(text: string): ToolModelOutputPart;
    /**
     * Builds a file part from a base64 payload. Binary data must be
     * base64-encoded by the caller; raw bytes are rejected by the harness
     * because they do not survive the durable JSON boundary.
     */
    file(base64: string, options: {
        readonly mediaType: string;
        readonly filename?: string;
    }): ToolModelOutputPart;
};