/**
 * @name session/delegated-session
 * @description Delegated session management — creates and validates sessions that delegate
 * agent capabilities to an MCP client with policy-enforced permissions.
 *
 * @flow
 *   1. `createDelegatedSession` validates requested permissions against the policy engine,
 *      then creates a new agent session via `createAgentSession`.
 *   2. `validateDelegatedSession` checks expiry, permission, and spending limits for an
 *      existing session before allowing a delegated action.
 *
 * @module session/delegated-session
 */
import type { SapAgentSession, SapMcpContext, SapPermission } from '../../core/src/types.js';
/**
 * @name createDelegatedSession
 * @description Creates a delegated agent session with policy-validated permissions and spending limits.
 *
 * @param context        — SAP MCP runtime context with policy engine.
 * @param agentId        — Unique identifier for the delegating agent.
 * @param permissions    — Array of permission strings to validate and grant.
 * @param spendingLimits — Spending limits for per-transaction, per-day, and per-session SOL amounts.
 * @returns A `SapAgentSession` with validated permissions and configured spending limits.
 * @throws `PolicyError` if the requested permissions fail policy validation.
 *
 * @usedBy Delegated session MCP tools in the SAP MCP runtime.
 */
export declare function createDelegatedSession(context: SapMcpContext, agentId: string, permissions: string[], spendingLimits: {
    maxPerTransactionSol: number;
    maxPerDaySol: number;
    maxPerSessionSol: number;
}): Promise<SapAgentSession>;
/**
 * @name validateDelegatedSession
 * @description Validates an existing delegated session for a given permission and optional SOL amount.
 *
 * @param session    — The agent session to validate.
 * @param permission — The permission required for the action.
 * @param amountSol  — Optional SOL amount to check against remaining session balance.
 * @returns `{ valid: true }` if all checks pass; `{ valid: false, error }` with a reason otherwise.
 *
 * @usedBy Delegated session MCP tools in the SAP MCP runtime.
 */
export declare function validateDelegatedSession(session: SapAgentSession, permission: SapPermission, amountSol?: number): {
    valid: boolean;
    error?: string;
};
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