/**
 * Serializes model and tool payloads into span content attributes for the
 * local trace viewer: prompt messages, the system prompt, responses, and
 * tool arguments/results. Everything is capped so a giant payload cannot
 * bloat a span segment past the reader's per-file limit, and message
 * payloads stay valid JSON through every truncation path.
 */
/** Content attributes are capped so a giant payload cannot bloat a span segment. */
export declare const CONTENT_ATTRIBUTE_LIMIT: number;
/**
 * Serializes one payload value. `strip` removes {@link CONTENT_NOISE_KEYS};
 * pass `false` for tool data, where those keys may be legitimate domain
 * fields the user authored or the tool returned.
 */
export declare function contentAttribute(value: unknown, strip?: boolean): string | undefined;
/**
 * Serializes the prompt messages, keeping the result parseable: oldest
 * messages drop first behind an omission marker, and a single message over
 * the cap is truncated at the text level rather than the JSON level.
 */
export declare function messagesContentAttribute(messages: unknown): string | undefined;
/**
 * Serializes provider-executed tool results, keeping the attribute valid
 * JSON under the cap: when the full payload is too big, each entry's input
 * and output collapse to capped text at progressively smaller budgets
 * instead of cutting the JSON mid-string.
 */
export declare function toolResultsContentAttribute(results: readonly Record<string, unknown>[]): string | undefined;
/** Normalizes the AI SDK's `instructions` prompt to plain text for `ai.prompt.system`. */
export declare function systemPromptAttribute(instructions: unknown): string | undefined;
/** Caps plain text, marking the cut. */
export declare function textContentAttribute(text: string): string | undefined;