Does this skill write implementation code?

No, it specifically avoids writing any logic. It only generates signatures and stubs to ensure that a separate agent or developer can provide the implementation later.

How does it handle different programming languages?

The skill is language-agnostic. it relies on the project's CLAUDE.md file to understand file path patterns, test commands, and language-specific guidance.

What is a 'default-value trap'?

It is a scenario where a test passes prematurely because a stub returns a default value (like 0, null, or false) that happens to match the test assertion. This skill explicitly avoids such inputs.

Can I use this for existing codebases?

Yes, it can be used to define new modules within an existing project by providing the desired behavior list and type signatures to the orchestrator.

What is the purpose of the Test Writer skill?

It automates the creation of test files and type stubs to establish a failing state in TDD workflows, ensuring the 'Red' phase is correctly implemented before any code is written.

Test Writer TDD Agent

Name: Test Writer TDD Agent
Author: kelp

bykelp

•

Security & Testing

Generates comprehensive test suites and minimal type stubs to establish the initial failing phase of the Test-Driven Development cycle.

The Test Writer skill is a specialized agent designed to streamline Test-Driven Development (TDD) by focusing exclusively on the specification phase. It transforms behavior requirements and module signatures into complete, compilable test files and minimal type stubs without writing any implementation logic. By ensuring all tests fail initially against these stubs, it establishes a robust 'Red' gate, allowing a separate implementation agent to focus entirely on passing the tests. This separation of concerns prevents implementation bias and ensures high-quality test coverage for edge cases, error paths, and boundary values across any programming language.

Key Features

01Focuses on behavior-driven testing rather than implementation details

02Creates logic-free type stubs to ensure test compilation without implementation

03Prevents 'default-value traps' where tests pass accidentally on empty return values

042 GitHub stars

05Generates complete test suites based on module behaviors and type signatures

06Verifies a 'Red' state by executing test commands to confirm initial failures

Use Cases

01Automating the initial 'Red' phase of a language-agnostic TDD pipeline

02Ensuring comprehensive test coverage for edge cases and error handling paths

03Defining interface specifications through tests before writing production code

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add kelp/kelp-claude-plugins test-writer

For use in Claude.ai and ChatGPT

Key Features

01Focuses on behavior-driven testing rather than implementation details

02Creates logic-free type stubs to ensure test compilation without implementation

03Prevents 'default-value traps' where tests pass accidentally on empty return values

042 GitHub stars

05Generates complete test suites based on module behaviors and type signatures

06Verifies a 'Red' state by executing test commands to confirm initial failures

Use Cases

01Automating the initial 'Red' phase of a language-agnostic TDD pipeline

02Ensuring comprehensive test coverage for edge cases and error handling paths

03Defining interface specifications through tests before writing production code