Agent skill

TDD Workflows TDD Red

by aiskillstore in aiskillstore/marketplace

Generate failing tests for the TDD red phase to define expected behavior and edge cases.

No licenceAuto-check passedTesting & QA

Install TDD Workflows TDD Red

skills CLI
$ npx skills add aiskillstore/marketplace --skill tdd-workflows-tdd-red -a claude-code

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

GitHub CLI
$ gh skill install aiskillstore/marketplace tdd-workflows-tdd-red --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/aiskillstore/marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/sickn33/tdd-workflows-tdd-red .claude/skills/tdd-workflows-tdd-red && 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/

Facts

Skill name
tdd-workflows-tdd-red
GitHub stars
433
Used in
7 other repos
Token cost
~1.3k tokens
SKILL.md length
462 words
Files
2
Skills in repo
1,044
Repo updated
First seen
Licence
None found

At a glance

Generate failing tests for the TDD red phase to define expected behavior and edge cases.

  • Works in 4 steps: Identify behaviors, constraints, and… → Generate failing tests that define… → Ensure failures are due to missing… → …
  • Tasks that involve Test-driven development
  • SKILL.md covers Use this skill when, Do not use this skill when, Instructions and Safety, plus 11 more sections
  • Needs INVALID_CREDENTIALS

What it does

TDD Workflows TDD Red is an agent skill from aiskillstore/marketplace. Generate failing tests for the TDD red phase to define expected behavior and edge cases.

Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `skill-report.json`).

It sits in Testing & QA, covering Test-driven development, Failing and flaky tests and Unit testing. It works with Jest. The repository describes itself as: Security-audited skills for Claude, Codex & Claude Code. One-click install, quality verified.

When your agent uses it

  • Tasks that involve Test-driven development
  • Tasks that involve Failing and flaky tests
  • Tasks that involve Unit testing

Example prompts

  • “/tdd-workflows-tdd-red”

Requirements

  • Python 3

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. Identify behaviors, constraints, and edge cases.
  2. Generate failing tests that define expected outcomes.
  3. Ensure failures are due to missing behavior, not setup errors.
  4. Document how to run tests and verify failures.

What it can do on your machine

Read from SKILL.md and the folder at commit 44923f3. 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 these keys or tokens, usually read from environment variables:

    • INVALID_CREDENTIALS

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

TDD Workflows TDD Red loads about 1.3k tokens when it runs. Until then it costs about 28 tokens; SKILL.md has 462 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~28
When it runs · the whole SKILL.md, loaded when a task matches
~1.3k

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

Without a licence we can't republish the file, so here is its outline and opening line. It has 462 words (~1,252 tokens).

“Write comprehensive failing tests following TDD red phase principles.”

— opening of SKILL.md by aiskillstore
name
tdd-workflows-tdd-red
risk
critical
source
community
date_added
2026-02-27

Read the full SKILL.md on GitHub

Files

SKILL.md and 1 other file in skills/sickn33/tdd-workflows-tdd-red of aiskillstore/marketplace.

  • SKILL.md
  • skill-report.json

Open the folder on GitHubat commit 44923f3

Used in 7 other repositories

We found 16 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 7 other GitHub owners. This page covers the copy in aiskillstore/marketplace, which our catalogue first saw on October 7, 2026.

Compare with similar skills

TDD Workflows TDD Red 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 Workflows TDD Red compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
TDD Workflows TDD Red this skillaiskillstore/marketplace4337 repos~1.3kAutomated safety check: PassNone
Test Guidelinesgetsentry/sentry-react-native1.8k—~1.3kAutomated safety check: PassMIT
Jest Testing PatternsChrisWiles/claude-code-showcase6.1k7 repos~1.5kAutomated safety check: PassNone
Designing TestsCloudAI-X/claude-workflow-v21.4k1 repos~1.5kAutomated safety check: PassMIT
Agent Harness Testing Methodologyhuiliyi37/Tianshu-harness1.1k—~1kAutomated safety check: NotesApache-2.0
Playwright Testingchongdashu/vibejam-starter-pack149—~2.1kAutomated safety check: PassNone

Similar skills

  • Test Guidelines

    getsentry/sentry-react-native

    Official

    Enforce Sentry React Native SDK test conventions for naming, structure, mocking, and fixtures with Jest.

    1.8k GitHub stars~1.3k tokensUpdated yesterday
    Testing & QAAuto-check passed
  • Jest Testing Patterns

    ChrisWiles/claude-code-showcase

    Jest patterns for React Native style tests: TDD discipline, mock factory functions, module and GraphQL hook mocking, custom render helpers and anti-patterns to avoid.

    6.1k GitHub starsUsed in 7 repos~1.5k tokens
    Testing & QAAuto-check passed
  • Designing Tests

    CloudAI-X/claude-workflow-v2

    Designs and implements testing strategies for any codebase. An agent skill from CloudAI-X/claude-workflow-v2.

    1.4k GitHub starsUsed in 1 repo~1.5k tokens
    Testing & QAAuto-check passed
  • Agent Harness Testing Methodology

    huiliyi37/Tianshu-harness

    Guides an agent through probing an unfamiliar project's test setup, then choosing a red-light-first testing strategy matched to the task type.

    1.1k GitHub stars~1k tokensUpdated yesterday
    Testing & QAAuto-check: notes
  • Playwright Testing

    chongdashu/vibejam-starter-pack

    Plan, implement, and debug frontend tests: unit/integration/E2E/visual/a11y.

    149 GitHub stars~2.1k tokensUpdated 5 mo ago
    Testing & QAAuto-check passed
  • Playwright Testing

    chongdashu/vibejam-starter-pack

    Plan, implement, and debug frontend tests: unit/integration/E2E/visual/a11y.

    149 GitHub stars~2.2k tokensUpdated 5 mo ago
    Testing & QAAuto-check passed

More from aiskillstore/marketplace

All 1,044 skills in this repo
  • Code Stats

    aiskillstore/marketplace

    Analyze codebase with tokei (fast line counts by language) and difft (semantic AST-aware diffs).

    433 GitHub starsUsed in 1 repo~697 tokens
    Auto-check: notes
  • Data Processing

    aiskillstore/marketplace

    Process JSON with jq and YAML/TOML with yq. An agent skill from aiskillstore/marketplace.

    433 GitHub starsUsed in 1 repo~720 tokens
    Auto-check: notes
  • Doc Scanner

    aiskillstore/marketplace

    Scans for project documentation files (AGENTS.md, CLAUDE.md, GEMINI.md, COPILOT.md, CURSOR.md, WARP.md, and 15+ other formats) and synthesizes guidance.

    433 GitHub starsUsed in 1 repo~644 tokens
    Auto-check: notes
  • File Search

    aiskillstore/marketplace

    Modern file and content search using fd, ripgrep (rg), and fzf.

    433 GitHub starsUsed in 1 repo~598 tokens
    Auto-check: notes
  • Find Replace

    aiskillstore/marketplace

    Modern find-and-replace using sd (simpler than sed) and batch replacement patterns.

    433 GitHub starsUsed in 1 repo~527 tokens
    Auto-check: notes
  • Project Planner

    aiskillstore/marketplace

    Detects stale project plans and suggests session commands. An agent skill from aiskillstore/marketplace.

    433 GitHub starsUsed in 1 repo~504 tokens
    Auto-check passed

Works with

Categories

Questions about TDD Workflows TDD Red

What does TDD Workflows TDD Red do?

Generate failing tests for the TDD red phase to define expected behavior and edge cases. TDD Workflows TDD Red is an agent skill from aiskillstore/marketplace. Generate failing tests for the TDD red phase to define expected behavior and edge cases.

When should I use TDD Workflows TDD Red?

TDD Workflows TDD Red fits situations like: tasks that involve Test-driven development; tasks that involve Failing and flaky tests; tasks that involve Unit testing.

How do I install TDD Workflows TDD Red in Claude Code?

Run `npx skills add aiskillstore/marketplace --skill tdd-workflows-tdd-red -a claude-code`. Or copy the skill folder (skills/sickn33/tdd-workflows-tdd-red in aiskillstore/marketplace) into .claude/skills/tdd-workflows-tdd-red in your project. Claude Code loads it when a task matches its description.

How do I install TDD Workflows TDD Red in Codex?

Run `npx skills add aiskillstore/marketplace --skill tdd-workflows-tdd-red -a codex`. Or copy the skill folder (skills/sickn33/tdd-workflows-tdd-red in aiskillstore/marketplace) into .agents/skills/tdd-workflows-tdd-red in your project. Codex loads it when a task matches its description.

Can I use TDD Workflows TDD Red 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 aiskillstore/marketplace --skill tdd-workflows-tdd-red -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-workflows-tdd-red, .gemini/skills/tdd-workflows-tdd-red, .github/skills/tdd-workflows-tdd-red and .opencode/skills/tdd-workflows-tdd-red in your project.

What does TDD Workflows TDD Red need to run?

Going by SKILL.md and its folder, TDD Workflows TDD Red needs credentials named INVALID_CREDENTIALS. Our summary lists: Python 3.

Does TDD Workflows TDD Red 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 Workflows TDD Red 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 Workflows TDD Red use?

No licence was found for TDD Workflows TDD Red or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does TDD Workflows TDD Red use?

About 1.3k tokens (SKILL.md is roughly 5k 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 Workflows TDD Red?

Skills that share tags, products or a category with TDD Workflows TDD Red: Test Guidelines (getsentry/sentry-react-native, 1.8k stars), Jest Testing Patterns (ChrisWiles/claude-code-showcase, 6.1k stars), Designing Tests (CloudAI-X/claude-workflow-v2, 1.4k stars) and Agent Harness Testing Methodology (huiliyi37/Tianshu-harness, 1.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains TDD Workflows TDD Red?

aiskillstore (a GitHub organization) maintains it in aiskillstore/marketplace, which has 433 GitHub stars. The repository holds 1,044 skills in this directory. The repository was last updated on October 10, 2026.

Source: aiskillstore/marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.