Official agent skill

TDD Red Green Refactor

by google-labs-code in google-labs-code/stitch-sdk

Enforces a disciplined Red-Green-Refactor (TDD) workflow in TypeScript/Node.js.

OfficialApache-2.0Auto-check passedTesting & QA

Install TDD Red Green Refactor

skills CLI

$ npx skills add google-labs-code/stitch-sdk --skill tdd-red-green-refactor -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install google-labs-code/stitch-sdk tdd-red-green-refactor --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/google-labs-code/stitch-sdk.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/tdd .claude/skills/tdd-red-green-refactor && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "tdd-red-green-refactor" agent skill from https://github.com/google-labs-code/stitch-sdk/tree/main/.agents/skills/tdd into .claude/skills/tdd-red-green-refactor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tdd-red-green-refactor", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/google-labs-code/stitch-sdk/tree/main/.agents/skills/tdd

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add google-labs-code/stitch-sdk --skill tdd-red-green-refactor -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install google-labs-code/stitch-sdk tdd-red-green-refactor --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/google-labs-code/stitch-sdk.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/tdd .agents/skills/tdd-red-green-refactor && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "tdd-red-green-refactor" agent skill from https://github.com/google-labs-code/stitch-sdk/tree/main/.agents/skills/tdd into .agents/skills/tdd-red-green-refactor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tdd-red-green-refactor", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add google-labs-code/stitch-sdk --skill tdd-red-green-refactor -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install google-labs-code/stitch-sdk tdd-red-green-refactor --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/google-labs-code/stitch-sdk.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/tdd .cursor/skills/tdd-red-green-refactor && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "tdd-red-green-refactor" agent skill from https://github.com/google-labs-code/stitch-sdk/tree/main/.agents/skills/tdd into .cursor/skills/tdd-red-green-refactor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tdd-red-green-refactor", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/google-labs-code/stitch-sdk.git --path .agents/skills/tdd

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add google-labs-code/stitch-sdk --skill tdd-red-green-refactor -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install google-labs-code/stitch-sdk tdd-red-green-refactor --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/google-labs-code/stitch-sdk.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/tdd .gemini/skills/tdd-red-green-refactor && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "tdd-red-green-refactor" agent skill from https://github.com/google-labs-code/stitch-sdk/tree/main/.agents/skills/tdd into .gemini/skills/tdd-red-green-refactor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tdd-red-green-refactor", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install google-labs-code/stitch-sdk tdd-red-green-refactor

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add google-labs-code/stitch-sdk --skill tdd-red-green-refactor -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/google-labs-code/stitch-sdk.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/tdd .github/skills/tdd-red-green-refactor && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "tdd-red-green-refactor" agent skill from https://github.com/google-labs-code/stitch-sdk/tree/main/.agents/skills/tdd into .github/skills/tdd-red-green-refactor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tdd-red-green-refactor", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add google-labs-code/stitch-sdk --skill tdd-red-green-refactor -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install google-labs-code/stitch-sdk tdd-red-green-refactor --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/google-labs-code/stitch-sdk.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/tdd .opencode/skills/tdd-red-green-refactor && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "tdd-red-green-refactor" agent skill from https://github.com/google-labs-code/stitch-sdk/tree/main/.agents/skills/tdd into .opencode/skills/tdd-red-green-refactor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tdd-red-green-refactor", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: tdd-red-green-refactor
GitHub stars: 1.8k
Token cost: ~755 tokens
SKILL.md length: 333 words
Files: 1
Skills in repo: 9
Repo updated: Oct 1, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

Enforces a disciplined Red-Green-Refactor (TDD) workflow in TypeScript/Node.js.

Works in 6 steps: Red (Establish Failure) → Green (Minimal Pass) → Refactor (Clean Up) → …
Tasks that involve Test-driven development
SKILL.md covers The Three-Phase Cycle, Core Operational Rules and Example Workflow (TypeScript +…
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

TDD Red Green Refactor is an agent skill from google-labs-code/stitch-sdk, published by the product's own GitHub organization. Enforces a disciplined Red-Green-Refactor (TDD) workflow in TypeScript/Node.js. Use this whenever creating new features, fixing bugs, or migrating logic to ensure high-quality, verifiable implementations.

Its SKILL.md is about 760 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Testing & QA, covering Test-driven development. It works with TypeScript and Node.js. The repository describes itself as: Generate UI screens from text prompts and extract their HTML and screenshots programmatically. The licence is Apache-2.0.

When your agent uses it

Tasks that involve Test-driven development

Example prompts

“Use the tdd-red-green-refactor skill to enforce a disciplined Red-Green-Refactor (TDD) workflow in TypeScript/Node.js”
“/tdd-red-green-refactor”

Requirements

Node.js

Workflow steps

6 steps, taken from the step headings in SKILL.md.

Red (Establish Failure)
Green (Minimal Pass)
Refactor (Clean Up)
No "Horizontal Splurging"
Impose Backpressure
Verification of Integrity

What it can do on your machine

Read from SKILL.md and the folder at commit e3f8ece. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

TDD Red Green Refactor loads about 755 tokens when it runs. Until then it costs about 57 tokens; SKILL.md has 333 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~57
When it runs · the whole SKILL.md, loaded when a task matches: ~755

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from google-labs-code/stitch-sdk at commit e3f8ece, republished under its Apache-2.0 licence (© google-labs-code). 333 words, ~755 tokens.

Download SKILL.mdSave it as .claude/skills/tdd-red-green-refactor/SKILL.md (or your agent's skills folder).

name: tdd-red-green-refactor
description: Enforces a disciplined Red-Green-Refactor (TDD) workflow in TypeScript/Node.js. Use this whenever creating new features, fixing bugs, or migrating logic to ensure high-quality, verifiable implementations.

Red-Green-Refactor (TDD) Skill: TypeScript Edition

This skill implements a structural framework for AI-assisted programming to ensure every line of code is verifiable, typed, and purposeful.

The Three-Phase Cycle

Phase 1: Red (Establish Failure)

You must prove the feature does not exist and that your test is valid.

Write One Test: Create a single test case (e.g., in Vitest or Jest) for the next small piece of behavior.
Execute & Fail: Run the test. It must fail.
Verify: Ensure the failure is related to the missing logic (e.g., ReferenceError: add is not defined) and not a configuration error.

Phase 2: Green (Minimal Pass)

Make the test pass as quickly and simply as possible.

Minimal Implementation: Write the simplest code that satisfies the test. Do not build for the future; focus strictly on the current "Red" test.
Run Tests: Execute the suite. All tests must be Green.
Evidence: The transition from Red to Green is the "Proof of Work" for the developer.

Phase 3: Refactor (Clean Up)

Improve the code structure while maintaining the "Green" state.

Clean Up: Improve naming, remove duplication, and optimize the code written in Phase 2.
Safety Net: Rerun the tests after every change. If they turn Red, revert the change immediately.

Core Operational Rules

1. No "Horizontal Splurging"

You are strictly forbidden from writing a large "splurge" of multiple tests at once. You must follow a strictly incremental loop:

Write 1 Test -> See it Fail -> Write 1 Fix -> See it Pass.
Repeat this loop for every sub-feature.

2. Impose Backpressure

Use automated assertions and strong typing (TypeScript) as backpressure to prevent the AI from "guessing" the solution or "playing in the mud" with low-quality code.

3. Verification of Integrity

Never modify an existing test to make a failing implementation pass. If a test must change, it must be because the requirement changed, not because the code is difficult to write.

Example Workflow (TypeScript + Vitest)

Step 1: Red

typescript

// math.test.ts
import { describe, it, expect } from "vitest";
import { add } from "./math";

describe("add", () => {
  it("should sum two numbers", () => {
    expect(add(2, 2)).toBe(4); // Fails: ReferenceError: add is not defined
  });
});

Step 2: Green

typescript

// math.ts
export const add = (a: any, b: any) => {
  return 4; // Passes: Minimal code to satisfy the test
};

Step 3: Refactor

typescript

// math.ts
/**
 * Sums two numbers with explicit type safety.
 */
export const add = (a: number, b: number): number => {
  return a + b; // Passes: Proper implementation with safety net
};

Files

Just SKILL.md in .agents/skills/tdd of google-labs-code/stitch-sdk.

Open the folder on GitHubat commit e3f8ece

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders. This page covers the copy in google-labs-code/stitch-sdk, which our catalogue first saw on October 7, 2026.

google-labs-code/jules-sdk.agents/skills/tdd

Compare with similar skills

TDD Red Green Refactor next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

TDD Red Green Refactor compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
TDD Red Green Refactor this skillgoogle-labs-code/stitch-sdk	1.8k	—	~755	Automated safety check: Pass	Apache-2.0	7 days ago
TDDccusage/ccusage	19k	—	~665	Automated safety check: Pass	Custom licence	today
E2E Testcrowdin/crowdin-api-client-js	139	—	~893	Automated safety check: Notes	MIT	5 days ago
Bungalfrevn/apollo	237	—	~2k	Automated safety check: Notes	MIT	1 mo ago
Bug HuntUse-Tusk/drift-node-sdk	173	—	~3.6k	Automated safety check: Pass	Apache-2.0	5 mo ago
Bunbastani-inc/atomic	846	—	~2.8k	Automated safety check: Pass	Custom licence	today

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Questions about TDD Red Green Refactor

What does TDD Red Green Refactor do?

Enforces a disciplined Red-Green-Refactor (TDD) workflow in TypeScript/Node.js. TDD Red Green Refactor is an agent skill from google-labs-code/stitch-sdk, published by the product's own GitHub organization.js.

When should I use TDD Red Green Refactor?

TDD Red Green Refactor fits situations like: tasks that involve Test-driven development.

How do I install TDD Red Green Refactor in Claude Code?

Run `npx skills add google-labs-code/stitch-sdk --skill tdd-red-green-refactor -a claude-code`. Or copy the skill folder (.agents/skills/tdd in google-labs-code/stitch-sdk) into .claude/skills/tdd-red-green-refactor in your project. Claude Code loads it when a task matches its description.

How do I install TDD Red Green Refactor in Codex?

Run `npx skills add google-labs-code/stitch-sdk --skill tdd-red-green-refactor -a codex`. Or copy the skill folder (.agents/skills/tdd in google-labs-code/stitch-sdk) into .agents/skills/tdd-red-green-refactor in your project. Codex loads it when a task matches its description.

Can I use TDD Red Green Refactor in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add google-labs-code/stitch-sdk --skill tdd-red-green-refactor -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/tdd-red-green-refactor, .gemini/skills/tdd-red-green-refactor, .github/skills/tdd-red-green-refactor and .opencode/skills/tdd-red-green-refactor in your project.

What does TDD Red Green Refactor need to run?

SKILL.md names no scripts, command-line tools or credentials: TDD Red Green Refactor is instructions for the agent only. Our summary lists: Node.js.

Does TDD Red Green Refactor access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is TDD Red Green Refactor safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does TDD Red Green Refactor use?

TDD Red Green Refactor is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does TDD Red Green Refactor use?

About 755 tokens (SKILL.md is roughly 3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to TDD Red Green Refactor?

Skills that share tags, products or a category with TDD Red Green Refactor: TDD (ccusage/ccusage, 19k stars), E2E Test (crowdin/crowdin-api-client-js, 139 stars), Bun (galfrevn/apollo, 237 stars) and Bug Hunt (Use-Tusk/drift-node-sdk, 173 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains TDD Red Green Refactor?

google-labs-code (a GitHub organization, an official publisher) maintains it in google-labs-code/stitch-sdk, which has 1,825 GitHub stars. The repository holds 9 skills in this directory. The repository was last updated on October 1, 2026.

Source: google-labs-code/stitch-sdk on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install TDD Red Green Refactor

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Red-Green-Refactor (TDD) Skill: TypeScript Edition

The Three-Phase Cycle

Phase 1: Red (Establish Failure)

Phase 2: Green (Minimal Pass)

Phase 3: Refactor (Clean Up)

Core Operational Rules

1. No "Horizontal Splurging"

2. Impose Backpressure

3. Verification of Integrity

Example Workflow (TypeScript + Vitest)

Files

Used in 1 other repository

Compare with similar skills

Similar skills

More from google-labs-code/stitch-sdk

Related

Questions about TDD Red Green Refactor