/**
 * Vercel AI SDK middleware for Keel governance.
 *
 * Usage:
 *   import { wrapLanguageModel } from "ai";
 *   import { keel, getCurrentKeelPermitId } from "keel-sdk/integrations/vercel-ai";
 *
 *   const model = wrapLanguageModel({
 *     model: yourModel,
 *     middleware: keel({ keelBaseUrl: "...", keelApiKey: "...", keelProjectId: "..." }),
 *   });
 *
 * Pass parent permit ID for agent-loop lineage via providerOptions:
 *   generateText({
 *     model,
 *     messages: [...],
 *     providerOptions: { keel: { parentPermitId: "permit_xxx" } },
 *   });
 *
 * Or read the LAST issued permit from within a tool handler:
 *   const parentId = getCurrentKeelPermitId();
 */
import type { LanguageModelMiddleware } from "ai";
import { getCurrentKeelPermitId } from "./_context";
export { getCurrentKeelPermitId };
type LanguageModelV2Middleware = LanguageModelMiddleware;
export interface KeelMiddlewareConfig {
    /** Keel API base URL. Defaults to KEEL_BASE_URL env var. */
    keelBaseUrl?: string;
    /** Keel API key. Defaults to KEEL_API_KEY env var. */
    keelApiKey?: string;
    /** Keel project ID. Defaults to KEEL_PROJECT_ID env var. */
    keelProjectId?: string;
    /** Subject for permit requests. */
    keelSubject?: {
        type: string;
        id: string;
    };
    /** Request timeout in milliseconds. */
    timeout?: number;
    /** Maximum retries on transient errors. */
    maxRetries?: number;
}
/**
 * Returns a LanguageModelV2Middleware that wraps every generate and stream
 * call with Keel permit acquisition, budget enforcement, and usage reporting.
 *
 * Alias: `keel()` is the short form; `createKeelMiddleware()` is the long form.
 */
export declare function createKeelMiddleware(config?: KeelMiddlewareConfig): LanguageModelV2Middleware;
/** Short-form alias for createKeelMiddleware(). */
export declare const keel: typeof createKeelMiddleware;