/**
 * Anthropic rate-limit / quota header capture.
 *
 * Anthropic returns limit state on the response headers of every request:
 * `anthropic-ratelimit-unified-*` for subscription (OAuth) accounts,
 * `anthropic-ratelimit-{requests,tokens}-*` for API-key accounts. The NeuroLink
 * Claude proxy forwards those verbatim and adds `x-neurolink-*` for what only
 * it knows (which account served the request, pool headroom, whether the
 * numbers are live or a carried-over snapshot).
 *
 * None of it used to reach the SDK: `doGenerate` returned a hardcoded empty
 * header bag and the streaming loop never looked. The capture point here is the
 * `fetch` the Anthropic SDK is constructed with — it is invoked exactly once
 * per HTTP request on BOTH the streaming and non-streaming paths, so a single
 * wrapper covers everything without touching the SSE loop or switching the
 * non-streaming call to `.withResponse()`.
 *
 * Scoping is per-request via AsyncLocalStorage rather than a field on the
 * provider: a provider instance is shared across concurrent calls, so an
 * instance field would race and attribute one request's limits to another.
 *
 * @module providers/anthropic/rateLimitCapture
 */
import type { AnthropicRateLimitInfo, ClaudeLimitSnapshot } from "../../types/index.js";
/**
 * Parse both Anthropic rate-limit header families into a single shape.
 *
 * Which family is present depends on the account type, so every field is
 * optional and absence is normal rather than an error.
 */
export declare function parseAnthropicLimitHeaders(headers: Headers): AnthropicRateLimitInfo;
/**
 * Build a snapshot from a response, or undefined when the response carries
 * neither Anthropic rate-limit headers nor NeuroLink proxy metadata.
 */
export declare function buildLimitSnapshot(headers: Headers, status: number, now?: number): ClaudeLimitSnapshot | undefined;
/**
 * Wrap a fetch so every response's limit headers are captured into the
 * enclosing `withLimitCapture` scope. A no-op outside such a scope.
 *
 * Capture never alters the response and never throws — a parsing failure must
 * not be able to break a request that the provider would otherwise complete.
 */
export declare function wrapFetchWithLimitCapture(inner: typeof fetch): typeof fetch;
/**
 * Run `body` in a capture scope and return its result alongside whatever limit
 * snapshot the underlying HTTP request(s) produced.
 */
export declare function withLimitCapture<T>(body: () => Promise<T>): Promise<{
    result: T;
    snapshot?: ClaudeLimitSnapshot;
}>;
/**
 * Current scope's snapshot, if any. Lets a long-running loop (the streaming
 * path) read limits mid-flight without unwinding the scope.
 */
export declare function getCapturedLimitSnapshot(): ClaudeLimitSnapshot | undefined;
/** Raw headers of the most recent captured response in this scope. */
export declare function getCapturedResponseHeaders(): Record<string, string> | undefined;
/** Enter a capture scope without wrapping a single call — for streaming, where
 *  the scope must outlive the function that opened it. */
export declare function runInLimitCaptureScope<T>(body: () => T): T;
/**
 * Attach limit state to the currently active OTel span.
 *
 * Uses the active span rather than threading one down from the generation
 * layer: that layer is provider-agnostic and should not learn about Anthropic
 * quota headers just to record them. The active span during a turn is the one
 * already carrying `gen_ai.usage.*` and `neurolink.cost`, so "what did this
 * cost" and "how much is left" answer from the same trace.
 */
export declare function setLimitSpanAttributes(snapshot: ClaudeLimitSnapshot): void;
/**
 * Emit one structured line per request describing remaining capacity.
 *
 * Leads with headroom ("how much is left") because that is the figure an
 * operator acts on; the raw utilization stays available on the snapshot for
 * anything computing against it. Escalates to WARN when the session window is
 * nearly spent or the provider has already flagged the account as
 * throttled/rejected.
 */
export declare function logClaudeLimitSnapshot(snapshot: ClaudeLimitSnapshot, model?: string, now?: number): void;