/**
 * Minimal JSON Schema validator — covers the subset needed for plugin
 * configSchema validation and tool inputSchema sanity checks. Intentionally
 * small (~80 lines, zero deps) and tolerant: unknown keywords are ignored so
 * authors can mix in non-standard extensions without breaking validation.
 *
 * NOT for full JSON Schema 2020-12 conformance. If a plugin needs $ref,
 * conditional schemas, format validation, or anything else exotic, it should
 * bring its own ajv-based validator and call this only for the cheap path.
 */
import type { JSONSchema } from '../types/tool.js';
export interface ValidationError {
    path: string;
    message: string;
}
export interface ValidationResult {
    ok: boolean;
    errors: ValidationError[];
}
export declare function validateAgainstSchema(value: unknown, schema: JSONSchema): ValidationResult;
export interface CoercionResult {
    value: unknown;
    /** True when at least one leaf was rewritten. */
    changed: boolean;
}
/**
 * Best-effort, lossless coercion of a value toward a JSON Schema. Models —
 * especially through OpenAI-compatible proxies — frequently deliver
 * arguments with the right *content* in the wrong *type*: numbers and
 * booleans encoded as strings ("5", "true"), scalars where a string is
 * expected, or a whole nested object serialized into a JSON string.
 *
 * Only conversions that cannot lose information are applied:
 *   - string → number/integer when the whole trimmed string parses cleanly
 *   - string "true"/"false" → boolean
 *   - number/boolean → string when a string is expected
 *   - JSON-serialized string → object/array when the parse yields that shape
 * Recurses into `properties`/`items`. Returns the (possibly new) value and
 * whether anything changed — callers should re-validate before trusting it.
 */
export declare function coerceAgainstSchema(value: unknown, schema: JSONSchema): CoercionResult;
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