export declare const REASONING_EFFORTS: readonly ["auto", "none", "minimal", "low", "medium", "high", "xhigh", "max"];
export type ReasoningEffort = (typeof REASONING_EFFORTS)[number];
/**
 * Shared chat always chooses an explicit reasoning tier. Keep `auto` in the
 * accepted type only so older persisted selections and external callers can
 * migrate cleanly; new UI and engine defaults resolve it to Medium.
 */
export declare const DEFAULT_REASONING_EFFORT: ReasoningEffort;
export declare const REASONING_EFFORT_LABELS: Record<ReasoningEffort, string>;
export declare function isReasoningEffort(value: unknown): value is ReasoningEffort;
export declare function getReasoningEffortOptionsForModel(model: string | undefined): ReasoningEffort[];
export declare function normalizeReasoningEffortForModel(model: string | undefined, effort: ReasoningEffort | undefined): ReasoningEffort | undefined;
/**
 * Normalize a chat request before it reaches an engine. Explicit off/minimal
 * sentinels must survive this layer so the engine can distinguish them from a
 * missing selection, which now means the Medium default.
 */
export declare function normalizeReasoningEffortForRequest(model: string | undefined, effort: ReasoningEffort | undefined): ReasoningEffort | undefined;
export declare function reasoningEffortLabel(effort: ReasoningEffort | undefined): string;
/**
 * Resolve a user-facing selection for a model. Legacy `auto`, missing values,
 * and tiers unsupported by the newly selected model all become Medium.
 * Non-reasoning models still retain Medium in persisted chat state so moving
 * back to a reasoning model has a predictable default; their engines omit the
 * effort through `normalizeReasoningEffortForModel`.
 */
export declare function resolveReasoningEffortSelection(model: string | undefined, effort: ReasoningEffort | undefined): ReasoningEffort;
export declare function stepDownReasoningEffort(effort: ReasoningEffort | undefined): ReasoningEffort | undefined;
/**
 * Anthropic's adaptive-thinking API is only available on the newer Claude
 * model families. Claude Haiku 4.5 is reasoning-capable, but it still
 * requires the legacy manual `budget_tokens` configuration.
 */
export declare function supportsClaudeAdaptiveThinking(model: string | undefined): boolean;
/**
 * Map the shared reasoning ladder to Anthropic's manual thinking budgets for
 * models that do not support adaptive thinking (currently Claude Haiku 4.5).
 */
export declare function anthropicManualThinkingBudget(effort: ReasoningEffort): 1024 | 4096 | 8000 | 16000 | 32000;
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