import type { Message, ProviderRequest, ProviderRequestOptions } from "@arnilo/prism";
/** `x-opencode-session` accepted length cap (OpenCode server session id). */
export declare const OPENCODE_SESSION_ID_MAX_LENGTH = 128;
/**
 * Resolve the OpenCode session id from cache intent first (`cacheKey`), then the
 * runtime `sessionId`. Sanitized + clamped via the shared core helper so session
 * ids cannot carry credentials, raw prompts, or disallowed characters.
 */
export declare function opencodeSessionId(options: ProviderRequestOptions | undefined): string | undefined;
/**
 * Provider-owned OpenCode headers. Applied after caller headers so callers cannot
 * replace `content-type` or the session id. `authorization` is added separately by
 * the provider after these.
 */
export declare function opencodeOwnedHeaders(options: ProviderRequestOptions | undefined): Record<string, string>;
/**
 * Whether Anthropic-route content `cache_control` markers may be emitted. Caching
 * is enabled unless explicitly disabled and the model opts in via
 * `ModelConfig.cache.kind: "cache_control"` (or the caller forces `cache.mode:
 * "on"` for an Anthropic-route model). The OpenAI-compatible chat route never
 * receives Anthropic `cache_control` fields.
 */
export declare function opencodeAnthropicCacheEnabled(request: ProviderRequest): boolean;
/**
 * Apply Anthropic-style `cache_control` markers only to the caller-selected Prism
 * breakpoints on the Anthropic Messages route, using the shared `applyCacheControl`
 * helper. Markers land on the last content block of each selected message; with no
 * breakpoints, no markers are emitted and the server relies on implicit caching.
 */
export declare function applyOpencodeAnthropicCacheControl(request: ProviderRequest): readonly Message[];