/**
 * a2a/schema/validate.ts — structural validation against the vendored A2A
 * subset in types.ts. Dependency-free by design (no npm JSON-Schema
 * engine): this is small enough to hand-check field by field, and every
 * check cites the field it is checking so a mismatch is traceable back to
 * README.md's source.
 *
 * Used two ways: the server validates every AgentCard and Task it emits
 * (a bug that shapes an invalid card is worse when nothing notices), and
 * `aibroker a2a check` uses the same functions against an ARBITRARY
 * remote agent's card, which is what makes that command interoperability
 * tooling rather than a self-test.
 */
export interface ValidationResult {
    ok: boolean;
    errors: string[];
}
/**
 * Spec 5.5 AgentCard Object. Checks only the fields this project sets —
 * see schema/README.md for what is deliberately out of scope.
 */
export declare function validateAgentCard(card: unknown): ValidationResult;
/** Spec 6.1 Task Object + 6.2 TaskStatus Object + 6.3 TaskState Enum. */
export declare function validateTask(task: unknown): ValidationResult;
/** Spec 6.4 Message Object — used to validate an inbound message/send params.message. */
export declare function validateMessage(msg: unknown): ValidationResult;
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