/**
 * Strip OpenClaw framework metadata from LLM payload strings before they're
 * stamped onto spans.
 *
 * OpenClaw injects several metadata blocks into user-role messages:
 *   - `[[reply_to ...]]` markers
 *   - `Conversation info (untrusted metadata): { ... }` blocks
 *   - `Sender (untrusted metadata): { ... }` blocks
 *   - `Untrusted context (... ): <<<EXTERNAL_UNTRUSTED_CONTENT ... >>>` blocks
 *     (the heavy one — can be MBs when web-search / RAG context is attached)
 *   - `media:<url>.jpg` image references
 *
 * Without stripping, every llm_input on a Telegram chat session balloons past
 * 1MB and our per-field truncation kicks in, losing the actual user prompt in
 * the noise. Mirrors `opik-openclaw/src/service/payload-sanitizer.ts`.
 */
export declare function sanitizePayloadString(value: string): string;
export declare function sanitizePayloadValue(value: unknown): unknown;
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