Test Writer

Test Writer is a Quality skill for Claude Code, published by vstorm-co in pydantic-deepagents.

1K stars126 forkson vstorm-co/pydantic-deepagentsAdded 2026/08/21Repository updated 2026/08/20

agent-frameworkai-agentsanthropicclaude-codeclicoding-agentdeep-researchdocker-sandboxllmsmcpplaywrightpydanticpydantic-aipythonsubagentstuivstorm

Install in seconds

Install Test Writer

Copy Test Writer into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/vstorm-co/pydantic-deepagents/tree/main/pydantic_deep/bundled_skills/test-writer ~/.claude/skills/test-writer

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/vstorm-co/pydantic-deepagents.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: pydantic_deep/bundled_skills/test-writer/SKILL.md in vstorm-co/pydantic-deepagents
Installs to: ~/.claude/skills/test-writer
Collection: One of 14 skills cataloged from this repository
Category: Quality — 1354 skills

What Test Writer does

Test Writer generates comprehensive tests for existing code. Use it to read a codebase, match its test framework, and write coverage for happy paths, edge cases, errors, and integration behavior.

Test Writer is cataloged under Quality on DirSkills. Test Writer comes from a repository tagged agent-framework, ai-agents, anthropic, claude-code and cli.

Documentation

README

Excerpt

Test Writer

Generate comprehensive tests for the target code.

Process

Read the source code to understand all public functions/methods
Identify the testing framework already used in the project (pytest, unittest, etc.)
Follow existing test patterns and conventions in the project
Write tests covering all categories below

Coverage Strategy

Happy Path

Normal inputs with expected outputs
All public methods/functions

Edge Cases

Empty inputs (empty string, empty list, None)
Boundary values (0, -1, max int)
Single element collections

Error Cases

Invalid input types
Missing required arguments
Network/IO failures (mock external calls)

Integration

Multiple functions working together
State changes across calls

Guidelines

This is the opening of the README. Read the full README on GitHub.

Frequently asked about Test Writer

What else does vstorm-co publish alongside Test Writer?
Test Writer is one of 14 skills that DirSkills catalogs from vstorm-co/pydantic-deepagents, the repository it ships in. Its siblings there include Build And Compile, Code Review and Code Review. Each one is a separate skill with its own page in this directory, installs the same way Test Writer does, and is maintained by vstorm-co in that same repository. The rest of the collection is listed on the vstorm-co/pydantic-deepagents page.
How does Test Writer compare to other Quality skills?
Test Writer ranks #827 by stars among the 1354 Quality skills in this catalog. The most-starred ones next to it are Benchmark, Benchmark Optimization Loop and API Design Patterns. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Test Writer against them. Open each page to compare what they document and how they install.