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faion-writing-constitutions

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SDD Framework: Creates constitution.md through codebase analysis OR Socratic dialogue for new projects. Triggers on "constitution.md", "constitution", "project constitution", "project standards".

QUICK START

How to use this skill

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  2. Copy the prompt below and paste it into your agent.
  3. Review the proposed files and risks before you approve installation.
Prompt to paste
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/faion-writing-constitutions/SKILL.md

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Copying this prompt does not install or run the skill. Review third-party files before use. Codex skill guide

SDD: Writing Constitutions

Communication: User's language. Docs: English.

Philosophy

Constitution.md — immutable project principles for ALL features.

Two modes:

  1. Existing Project → codebase analysis
  2. New Project → Socratic dialogue

MODE 1: Existing Project

Workflow: Detect → Analyze Structure → Tech Stack → Patterns → Draft → Review

Analyze:

  • Directory layout, CLAUDE.md, README.md
  • Config files (pyproject.toml, package.json)
  • Architecture patterns, naming, linters, testing

Present findings:

**Analysis:**
1. Tech: Python 3.11, Django 4.2, PostgreSQL
2. Architecture: Layered (views → services → models)
3. Standards: black + isort + flake8
Does this match? What to change?

MODE 2: New Project

Workflow: Vision → Tech Choices → Architecture → Standards → Draft → Review

Vision (Socratic)

"Tell me about the project. What problem does it solve?"

Apply Five Whys to get to real need.

Tech Choices (Alternatives)

For each decision — present A/B/C with pros/cons:

  • Backend: Django vs FastAPI vs NestJS
  • Database: PostgreSQL vs MongoDB vs SQLite

Architecture (Trade-offs)

  • Monolith vs Microservices
  • REST vs GraphQL
  • ORM vs Raw SQL

Standards

  • Linter, formatter, type hints
  • Testing coverage, CI/CD
  • Git conventions

Draft (Both Modes)

Section by section with validation:

  1. Overview → "Correct?"
  2. Technology Stack → "Everything listed?"
  3. Architecture Patterns → "Matches vision?"
  4. Code Standards → "Agreed?"

Save

mkdir -p aidocs/sdd/{project}
# Write constitution.md

Create CLAUDE.md navigation hub.

Anti-patterns

  • ❌ Copying without understanding
  • ❌ Over-engineering at start
  • ❌ Ignoring team expertise

Output

aidocs/sdd/{project}/constitution.md → Next: faion-writing-specifications