import type { JSONSchema } from "../models/types.js";
/**
 * Validate tool call arguments against the tool's JSON Schema.
 * Returns null if valid, or a descriptive error string if invalid.
 *
 * Supports the JSON Schema subset used by our tool definitions:
 * - type: "object", "string", "number", "integer", "boolean", "array"
 * - required: string[] (required property names)
 * - properties: Record<string, schema> (property schemas)
 * - enum: any[] (allowed values)
 * - items: schema (array item schema)
 * - minimum, maximum (number bounds)
 * - minLength, maxLength (string bounds)
 */
export declare function validateToolArgs(args: unknown, schema: JSONSchema, toolName: string): string | null;
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