Is this skill based on a specific methodology?

Yes, it is based on the 'Docstring Fixpoint Theory' popularized by Peter Norvig in his 'pytudes' notebooks.

What is docstring-code isomorphism?

Isomorphism is a state where the natural language in the docstring and the functional logic in the code mirror each other exactly, making the code's purpose immediately obvious.

Can I use this for languages other than Python?

While the examples are in Python, the logic-to-documentation mapping principle can be applied to any programming language that supports function-level comments.

How does this improve code quality?

By writing the docstring first, you are forced to define the function's responsibility clearly, which often leads to simpler logic and better helper function separation.

When should I avoid using this skill?

This pattern is overkill for trivial one-line functions, private implementation details, or rapid prototyping where logic is changing too quickly to document.

Docstring-First Coding Pattern

Name: Docstring-First Coding Pattern
Author: jimmc414

byjimmc414

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学習とドキュメンテーション

Implements Peter Norvig's Docstring Fixpoint Theory to ensure code and documentation are perfectly aligned and readable.

This skill guides Claude to follow a high-level design pattern where function specifications are written as docstrings before any implementation begins. Based on Peter Norvig’s 'Docstring Fixpoint Theory,' it encourages an iterative process where the docstring and code are refined until they reach isomorphism—where the code reads like a direct translation of the natural language description. This approach is ideal for developers seeking to produce exceptionally clean, maintainable, and self-documenting code for complex logic or educational purposes.

主な機能

01Natural language vocabulary matching in logic

021 GitHub stars

03Fixpoint verification to ensure completion

04Specification-driven function development

05Recursive helper function decomposition

06Iterative docstring-code isomorphism checking

ユースケース

01Writing complex business logic that requires high clarity and precise intent

02Refactoring legacy functions by defining clear specifications before rewriting the logic

03Developing educational codebases or open-source libraries where documentation is critical

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add jimmc414/claude-code-plugin-marketplace write-docstring-first

For use in Claude.ai and ChatGPT

Download Skill