import type { ContextUsage } from '../../core/types/agent-types.js';
/** Infer the initial Claude context window from the configured model-name contract. */
export declare function inferClaudeContextWindow(model: string | null | undefined): number;
/**
 * Tracks the latest provider call rather than aggregating a Cortex turn. The configured-model
 * suffix supplies the first-turn default; result.modelUsage replaces it with the runtime window.
 */
export declare class ClaudeContextUsageTracker {
    private readonly configuredModel;
    private readonly autoCompactWindow;
    private contextWindow;
    private currentInput;
    private currentUsed;
    private activeModel;
    private resultFallbackAllowed;
    private lastSnapshotKey;
    constructor(configuredModel?: string | null, autoCompactWindow?: number | null);
    /** Claude compacts at the configured auto-compact window, so the usable window — and therefore
     *  the occupancy denominator — is the smaller of that setting and the model's own window. */
    private capped;
    observe(value: unknown): ContextUsage | null;
    private observeStream;
    private observeMessageStart;
    private observeMessageDelta;
    private observeCompaction;
    private observeResult;
    private snapshot;
}