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mchien15
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specs

Generate Functional Specification Documents and use cases from codebases.

Updated Mar 29, 2026
Search Tags:#templates#documentation#fsd#business-analysis#cross-references#use-cases#requirements-engineering
One-click install
npx skills add https://github.com/mchien15/wrenai --skill specs-mchien15
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: specs
Source: https://github.com/mchien15/wrenai/tree/main/.claude/skills/specs
Command: npx skills add https://github.com/mchien15/wrenai --skill specs-mchien15

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Documentation and alignment between business goals and the codebase can be manual, scattered, and inconsistent. This skill automates the creation and ongoing maintenance of Functional Specification Documents (FSD) and use-case documentation by analyzing codebases, PRD context, and stakeholder requirements.

Core Features & Use Cases

  • FSD generation: Create comprehensive Functional Specification Documents mapped to modules and features.
  • Use case development: Produce modular, cross-referenced use cases for each feature.
  • Workflow automation: Follow init/analyze/update workflows to bootstrap and keep docs in sync with code.
  • Templates & cross-references: Use standardized templates and link FSD sections to relevant use cases.

Quick Start

Run the specs init workflow to generate the initial FSD and use cases from your codebase and PRD context.

Frequently Asked Questions about specs

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I generate a Functional Specification Document from an existing codebase?▼

To generate a Functional Specification Document (FSD) from a codebase, you can run the init workflow to analyze project modules and map business goals to features. It outputs a comprehensive FSD to docs/project-fsd.md.

What is the best way to keep use case documentation synced with code changes?▼

Keeping use case documentation synced involves running update workflows that analyze codebase changes and maintain cross-references. This skill automates the process by outputting modular use cases to docs/usecases/ and linking them to FSD sections.

Can I create cross-references between FSD sections and use cases automatically?▼

Yes, you can create cross-references between FSD sections and use cases automatically. This skill enforces template-driven outputs that map each functional specification section directly to its relevant modular use cases.

Does this requirements engineering tool work for projects with multiple modules?▼

Yes, this requirements engineering tool works specifically for projects with multiple modules. It analyzes the codebase to generate module-specific use cases and maps business goals to individual features within each module.

How do I start writing use cases from PRD context and stakeholder requirements?▼

To start writing use cases from PRD context and stakeholder requirements, run the init workflow. It analyzes your requirements alongside the codebase to produce standardized, modular use case documentation in docs/usecases/.

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