@hashgraphonline/hedera-agent-kit/src/langchain/tools/account/revoke-hbar-allowance-tool.ts

Build LLM-powered applications that interact with the Hedera Network. Create conversational agents that can understand user requests in natural language and execute Hedera transactions, or build backend systems that leverage AI for on-chain operations.

import { z } from 'zod';
import { RevokeHbarAllowanceParams } from '../../../types';
import {
  BaseHederaTransactionTool,
  BaseHederaTransactionToolParams,
} from '../common/base-hedera-transaction-tool';
import { BaseServiceBuilder } from '../../../builders/base-service-builder';
import { AccountBuilder } from '../../../builders/account/account-builder';

const RevokeHbarAllowanceZodSchemaCore = z.object({
  ownerAccountId: z
    .string()
    .optional()
    .describe(
      'Optional. The HBAR owner account ID (e.g., "0.0.xxxx"). Defaults to operator.'
    ),
  spenderAccountId: z
    .string()
    .describe(
      'The spender account ID whose HBAR allowance is to be revoked (e.g., "0.0.yyyy").'
    ),
  memo: z.string().optional().describe('Optional. Memo for the transaction.'),
});

export class HederaRevokeHbarAllowanceTool extends BaseHederaTransactionTool<
  typeof RevokeHbarAllowanceZodSchemaCore
> {
  name = 'hedera-account-revoke-hbar-allowance';
  description =
    'Revokes/clears an HBAR allowance for a specific spender by approving zero HBAR.';
  specificInputSchema = RevokeHbarAllowanceZodSchemaCore;
  namespace = 'account';

  constructor(params: BaseHederaTransactionToolParams) {
    super(params);
  }

  protected getServiceBuilder(): BaseServiceBuilder {
    return this.hederaKit.accounts();
  }

  protected async callBuilderMethod(
    builder: BaseServiceBuilder,
    specificArgs: z.infer<typeof RevokeHbarAllowanceZodSchemaCore>
  ): Promise<void> {
    await (builder as AccountBuilder).revokeHbarAllowance(
      specificArgs as unknown as RevokeHbarAllowanceParams
    );
  }
}