export type FastModePreference = 'on' | 'off';
export type FastExecutionPath = 'top-level' | 'child' | 'subagent' | 'skill' | 'compaction' | 'summarization' | 'one-shot' | 'auxiliary';
export type FastModeInactiveReason = 'preference-off' | 'unsupported-provider' | 'custom-endpoint' | 'excluded-execution-path' | 'unsupported-model';
export interface FastModeContext {
    resolvedModelId: string;
    providerFamily: string;
    hasCustomEndpoint: boolean;
    executionPath: FastExecutionPath;
}
export type FastModeStatus = Readonly<{
    preference: FastModePreference;
    effective: boolean;
    reason?: FastModeInactiveReason;
}>;
export type FastTurnDecision = FastModeStatus;
export declare function resolveFastModeStatus(preference: FastModePreference, context: FastModeContext): FastModeStatus;
export declare class FastModeController {
    private preference;
    constructor(initial?: FastModePreference);
    getPreference(): FastModePreference;
    setPreference(preference: FastModePreference): void;
    resolveStatus(context: FastModeContext): FastModeStatus;
    snapshotTurn(context: FastModeContext): FastTurnDecision;
}