Banking-Agent: A Dual-Agent Banking Intelligent Assistant Based on LangChain

Banking-Agent is a dual-agent banking intelligent assistant built on the LangChain framework, designed to address security challenges in the financial AI field—balancing the professional service capabilities of LLMs with strict domain boundary control. The project achieves secure and compliant banking Q&A services through the collaboration between a Banking Expert Agent (handling professional queries) and a Boundary Guard Agent (detecting out-of-domain issues), which can be applied in scenarios such as customer self-service, internal training, and financial education.

When LLMs penetrate the financial services sector, the core issue is how to leverage AI capabilities while preventing out-of-domain responses to non-financial questions or the provision of harmful financial advice. The Banking-Agent project addresses this challenge by demonstrating a method to achieve strict domain control through architectural design, providing a reference for financial AI applications.

Dual-Agent Architecture

• Banking Expert Agent: Proficient in banking products, processes, etc., handles professional queries;
• Boundary Guard Agent: Determines whether a question belongs to the banking domain; rejects if out of domain;
• Collaboration Mechanism: The Guard Agent evaluates first; activates the Expert Agent only after confirming compliance.

LangChain Framework Application

• Uses an agent executor to coordinate the work of the two agents;
• Tool system for extended capabilities (e.g., connecting to banking APIs);
• Memory function supports contextually coherent multi-turn conversations.

Domain Boundary Control

• Prompt engineering to clearly define domain boundaries;
• Classifier model to assist in domain judgment;
• Output filtering to ensure content security;
• Provides guided refusal phrases when out of domain.

Banking Knowledge Coverage

Covers areas such as account services, loan products, credit cards, digital banking, and basic financial knowledge.

Security and Compliance Considerations

• Data Privacy: Distinguishes between general knowledge and customer data; identity verification is required to access sensitive information;
• Disclaimer: Clearly provides general information and does not constitute professional advice;
• Audit Logs: Configurable to record conversations for compliance audits;
• Content Security: Domain control prevents the generation of harmful content.

Application Scenarios

• Customer Self-Service: Reduces the workload of human customer service;
• Internal Training: Helps new employees learn product knowledge;
• Financial Education: Popularizes basic financial management knowledge;
• Prototype Verification: Provides experience for the deployment of banking AI customer service.

Banking-Agent provides important implications for financial AI applications:

1. Domain control is the foundation of financial AI security; architectural design can prevent AI hallucinations and inappropriate advice;
2. The dual-agent architecture is a feasible model for security design, separating professional capabilities from security control;
3. Open-source projects accelerate industry innovation and lower the threshold for AI application exploration.

The project demonstrates a solution for the secure application of LLMs in the financial sector, driving financial services toward a more intelligent and secure direction.

The project has the following areas for improvement:

• Knowledge Update: Integrate a real-time knowledge base to synchronize product policy changes;
• Multilingual Support: Expand to non-English languages;
• Personalized Services: Provide customized suggestions based on customer preferences;
• Complex Query Handling: Enhance the ability to handle multi-product comparisons or complex calculations.