/**
 * Last-resort name heuristic, used only when the runtime can't tell us (e.g. a
 * non-Ollama OpenAI-compatible gateway). NOT the source of truth — the runtime
 * probe and response-learning override it. Kept deliberately small.
 */
export declare function isThinkingByName(model: string): boolean;
export declare function cachedThinking(model: string): boolean | undefined;
/** Once a model is known to think, it stays that way for the session. */
export declare function markThinking(model: string): void;
/**
 * Learn from an actual response: a populated reasoning trace, or empty content
 * despite spent tokens, both prove a thinking channel — regardless of the
 * model's name or provider. This is what makes the characterization robust to
 * models no list knows about yet.
 */
export declare function observeResponse(model: string, r: {
    content: string;
    reasoning: string;
    completionTokens: number;
}): void;
/**
 * Best-effort upfront characterization, cached per model. Probes the runtime
 * first (authoritative), falls back to the name hint. Never throws. Call once
 * before the first request to a model; subsequent calls are cache hits.
 */
export declare function characterizeThinking(model: string, opts: {
    apiUrl: string;
    apiKey: string;
}): Promise<boolean>;
/** Synchronous best-known answer: cache if populated, else the name hint. */
export declare function isThinkingModel(model: string): boolean;
/** Test helper. */
export declare function _resetThinkingCache(): void;