/**
 * An address, as `reads:`, `agent-from:` and the other `-from` keys write it:
 * a name, then fields (`plan.output.subtasks`).
 *
 * An address is a CEL field selection, so it is parsed and typed by the very
 * code that types a condition, and the two can never disagree on what
 * `plan.output.subtasks` names. The one difference is prose: an address may
 * name an agent's text whole, to hand it to the next agent.
 */
import type { ValueType } from "../type.ts";
import { type Readable } from "./compile.ts";
/** Why an address was refused. */
export type AddressProblem = {
    readonly code: "invalid-address" | "unknown-address";
    readonly message: string;
};
/** The type an address names, or why it names none. */
export type TypedAddress = {
    readonly ok: true;
    readonly type: ValueType;
} | {
    readonly ok: false;
    readonly problems: readonly AddressProblem[];
};
/** The type `source` names among `readable`. */
export declare function typeOfAddress(source: string, readable: Readable): TypedAddress;
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