Domain-Specific Agents: Building Efficient AI Workflows with Spec-Driven Development

This project was published by williamobiana on GitHub (Project link: https://github.com/williamobiana/domain-specific-agents, release date: May 24, 2026), inspired by Heeki Park's blog Using spec-driven development with Claude. The core goal is to solve the problems of imprecise output and high reasoning costs of general large language models in specific domain tasks using Domain-Specific Agents and Spec-Driven Development methods, and build efficient AI workflows focused on specific business domains (such as finance).

Generative AI is developing rapidly, but general large language models have two major pain points when handling complex tasks in specific domains such as finance and healthcare:

1. Imprecise output: It is difficult to align with domain-specific professional logic;
2. High reasoning cost: Large token consumption. Domain-specific agents are designed to solve these problems—by building specialized AI agents for specific business domains, they achieve clearer task processing workflows and more economical token usage.

Spec-Driven Development is an emerging development methodology for AI agents, whose core is defining detailed requirement documents and design specifications first, then coding. It draws on the concept of Test-Driven Development (TDD) in traditional software engineering but adapts to AI characteristics. This project is inspired by Heeki Park's blog, which explains how to use structured specification documents to guide AI such as Claude to complete complex development tasks, reduce reasoning uncertainty, and improve output quality.

The project is implemented in Python, with core components including:

1. Classification System (Categories): Predefined domain categories (e.g., 6 major income and expense categories in the finance domain) to support precise business logic processing;
2. Intelligent Grouping Engine (Grouper): A two-level matching strategy (exact matching + fuzzy matching) to map text data to predefined categories;
3. Data Parser: Extract structured data from unstructured text (e.g., identifying multi-currency amounts);
4. Summary Generator (Summariser): Aggregate categorized data to generate structured reports;
5. Output Writer: Output results in standard CSV format.

The project's specification definition system is located in the .claude/agents/ directory and includes four core roles:

1. Requirements Spec Expert (spec-requirements): Write requirement documents in EARS format (including user stories and acceptance criteria);
2. Design Spec Expert (spec-design): Convert requirements into technical design documents (architecture diagrams, data models, business processes, etc.);
3. Implementation Spec Expert (spec-impl): Write code according to design documents;
4. Review Spec Expert (spec-judge): Check whether the implementation complies with requirements and design specifications.

Workflow: Requirement phase → Design phase → Implementation phase → Review phase, with clear deliverables and acceptance criteria for each phase. Technical Advantages:

1. Reduce reasoning cost: Predefined domain categories and specifications reduce token consumption;
2. Improve output quality: Structured specifications reduce generation uncertainty;
3. Enhance maintainability: Specification documents are synchronized with code, reducing knowledge transfer costs;
4. Support domain expansion: The architecture is general and can quickly adapt to domains such as healthcare and engineering.

Practical Recommendations:

1. Deeply understand the business domain and collaborate with domain experts to establish a classification system;
2. Attach importance to specification documents and maintain them as first-class citizens;
3. Iteratively optimize matching algorithms;
4. Establish a user feedback loop. Future Outlook: Domain-specific agents are expected to become the mainstream model for enterprise AI applications. Through domain specialization, they can achieve higher accuracy and efficiency while retaining the capabilities of general models.