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domain-extractor

Business
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Extract technology-free domain model from codebase. Produces a pure business-language specification that any stakeholder can understand. Use for: understand legacy code, document business logic, domain modeling, business requirements extraction, what does this code do, explain codebase to non-technical stakeholders.

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How to use this skill

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I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/development/domain-extractor/SKILL.md

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Domain Extractor

Extract pure business domain from code. Output contains ZERO technology terms.

Purpose

Transform code into a business specification that:

  • A CEO can understand
  • Survives technology changes
  • Captures what the system DOES, not HOW

Activation

  • "What does this codebase do?"
  • "Extract the business logic"
  • "Document this for stakeholders"
  • "I need to understand this legacy system"

Process

Step 1: Analyze Code (10-15 min)

Read the codebase looking for:

  • Models/Entities → Domain concepts
  • Validation → Business rules
  • Controllers/Handlers → Workflows
  • Error messages → User expectations

Step 2: Translate to Business Language

Forbidden terms (if you write these, rewrite):

API, REST, GraphQL, HTTP, endpoint, request, response,
database, SQL, query, schema, table, cache, session, token,
component, frontend, backend, server, client, service,
function, class, method, controller, middleware

Translation examples:

CodeBusiness Language
POST /api/ordersCustomer places order
SELECT * FROM usersLook up customer
validateCart()Verify order is valid
sendEmail()Notify customer
redis.cache()Remember for quick access

Step 3: Produce Output

Generate this exact format:

# Domain Specification: [System Name]

## Purpose
[One paragraph: What business problem this solves]

## Actors
- **[Actor 1]**: [Role description]
- **[Actor 2]**: [Role description]

## Core Concepts
| Concept | Definition |
|---------|------------|
| [Name] | [Business meaning] |

## Workflows

### [Workflow 1 Name]
1. [Actor] [action] [object]
2. System [verifies/records/notifies] [what]
3. [Result]

### [Workflow 2 Name]
...

## Business Rules
- [Rule 1]
- [Rule 2]

## Constraints
- [Constraint 1]
- [Constraint 2]

Validation

Before delivering, verify:

  1. Read aloud - would a non-technical person understand every word?
  2. Search for forbidden terms - zero should appear
  3. Check completeness - all major code paths represented?

Example

See references/example.md for complete input/output example.

Output

Single markdown document: Domain Specification

No tech stack recommendations. No architecture proposals. Just pure domain.