import type { IncomingMessage } from 'node:http';
/** Body cap in bytes for a tool. `WIGOLO_SERVE_MAX_BODY_BYTES` overrides the
 * base cap; diff/extract get the larger cap when no override is set. */
export declare function bodyCapFor(tool: string): number;
/** Per-route response deadline in ms, scaled by `WIGOLO_SERVE_TIMEOUT_SCALE`. */
export declare function deadlineFor(tool: string): number;
/** In-flight cap on /v1 + shim; `WIGOLO_SERVE_MAX_CONCURRENCY` overrides. */
export declare function maxConcurrency(): number;
export interface ClampSpec {
    tool: string;
    field: string;
    /** For scalar fields: the maximum value. For array fields: max item count. */
    max: number;
    kind: 'scalar' | 'array';
}
/**
 * Single source of truth for server-side param clamps, imported by both the
 * router (enforcement) and openapi.ts (bound injection) so the served bounds
 * can never drift from the enforced ones.
 */
export declare const CLAMP_TABLE: readonly ClampSpec[];
export interface ClampViolation {
    field: string;
    max: number;
    kind: 'scalar' | 'array';
}
/**
 * Generic clamp check: compares body fields against the clamp table. Returns
 * the first violation or null. Array clamps only fire when the field is an
 * array (a string `query` is unbounded by this table).
 */
export declare function findClampViolation(tool: string, body: Record<string, unknown>): ClampViolation | null;
export declare class BodyTooLargeError extends Error {
    constructor();
}
/**
 * Read and JSON-parse a request body, destroying the stream if it exceeds
 * `capBytes` (→ BodyTooLargeError). An empty body parses to `{}`. A parse
 * failure rejects with a SyntaxError (router maps to 400 invalid_json).
 */
export declare function readJsonBodyCapped(req: IncomingMessage, capBytes: number): Promise<unknown>;
/** Simple counting semaphore for the in-flight cap. Acquired pre-dispatch,
 * released ONLY when the handler promise settles (never at 504). */
export declare class ConcurrencySlots {
    private readonly cap;
    private inFlight;
    constructor(cap: number);
    tryAcquire(): boolean;
    release(): void;
    get active(): number;
}
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