import type { SessionId } from '../../types/ids/index.js';
import type { Origin } from '../../types/session/turn.js';
import { type ExternalSessionLookup } from '../external-session.js';
/**
 * An A2A `contextId`, resolved to the namzu session it names.
 *
 * A context is a session. An incoming id that is an existing session, or that
 * a session already claimed, reaches that session; any other id creates one.
 * The id is opaque: a legacy client that still sends its project UUID gets one
 * session for that id, and the id is never read as a project. With no
 * `contextId`, a new session is created and its id is the context id the host
 * returns.
 */
export interface A2AContextResolution {
    readonly sessionId: SessionId;
    /** The context id to put on every task and event: the peer's own, or the new session's id. */
    readonly contextId: string;
    /** True when the host must create the session (its first turn records `origin`). */
    readonly created: boolean;
    /** Present when `created`: record it on the new session's first turn. */
    readonly origin?: Origin;
}
export declare function resolveA2AContext(contextId: string | undefined, index: ExternalSessionLookup, options?: {
    readonly newSessionId?: () => SessionId;
}): Promise<A2AContextResolution>;
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