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Agent skill

TDD

by jh941213 in jh941213/my-cc-harness

Test-driven development - write tests first, then implement.

No licenceAuto-check: notesTesting & QA

Install TDD

skills CLI
$ npx skills add jh941213/my-cc-harness --skill tdd -a claude-code

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

GitHub CLI
$ gh skill install jh941213/my-cc-harness tdd --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/jh941213/my-cc-harness.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills_en/tdd .claude/skills/tdd && 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
GitHub stars
126
Token cost
~334 tokens
SKILL.md length
95 words
Files
1
Skills in repo
62
Repo updated
First seen
Licence
None found

At a glance

Test-driven development - write tests first, then implement.

  • Works in 6 steps: Define Interface (SCAFFOLD) → Write Tests (RED) → Run Tests - Confirm Failure → …
  • RED-GREEN-REFACTOR
  • SKILL.md covers TDD Cycle, Procedure and Precautions
  • Calls npm

What it does

TDD is an agent skill from jh941213/my-cc-harness. Test-driven development - write tests first, then implement. Triggers on "TDD", "test first", "test-driven", "RED-GREEN-REFACTOR". Anti-triggers: "implement first", "tests later".

Its SKILL.md is about 330 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.

When your agent uses it

  • RED-GREEN-REFACTOR
  • Tasks that involve Test-driven development

Example prompts

  • “test first”
  • “test-driven”
  • “RED-GREEN-REFACTOR”
  • “/tdd”

Requirements

  • Pre-approved tools (allowed-tools): Read, Write, Edit, Bash

Workflow steps

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

  1. Define Interface (SCAFFOLD)
  2. Write Tests (RED)
  3. Run Tests - Confirm Failure
  4. Minimal Implementation (GREEN)
  5. Refactor (REFACTOR)
  6. Check Coverage

What it can do on your machine

Read from SKILL.md and the folder at commit e9210e2. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Write
    • Edit
    • Bash

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • npm

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use npm, which can reach the network depending on how they are called.

    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 loads about 334 tokens when it runs. Until then it costs about 46 tokens; SKILL.md has 95 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~46
When it runs · the whole SKILL.md, loaded when a task matches
~334

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: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
    allowed-tools: Read, Write, Edit, Bash

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 95 words (~334 tokens).

“Applies TDD methodology: write tests first, then implement code.”

— opening of SKILL.md by jh941213
name
tdd
allowed-tools
Read, Write, Edit, Bash
disable-model-invocation
false
user-invocable
true

Read the full SKILL.md on GitHub

Files

Just SKILL.md in skills_en/tdd of jh941213/my-cc-harness.

Open the folder on GitHubat commit e9210e2

Compare with similar skills

TDD 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 compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
TDD this skilljh941213/my-cc-harness126—~334Automated safety check: NotesNone
TDDpietheinstrengholt/rssmonster56430 repos~906Automated safety check: PassMIT
TDD WorkflowhellangleZ/burn-in-cceverywhere-ralph11211 repos~2.4kAutomated safety check: PassNone
TDDsanity-io/sanity6.4k20 repos~1kAutomated safety check: PassMIT
Test Driven Developmentfarm-fe/farm5.6k51 repos~2.5kAutomated safety check: PassMIT
Tapd Story PipelineTencentBlueKing/bk-bcs840—~2.6kAutomated safety check: PassCustom licence

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Categories

Questions about TDD

What does TDD do?

Test-driven development - write tests first, then implement. TDD is an agent skill from jh941213/my-cc-harness. Test-driven development - write tests first, then implement.

When should I use TDD?

TDD fits situations like: RED-GREEN-REFACTOR; tasks that involve Test-driven development.

How do I install TDD in Claude Code?

Run `npx skills add jh941213/my-cc-harness --skill tdd -a claude-code`. Or copy the skill folder (skills_en/tdd in jh941213/my-cc-harness) into .claude/skills/tdd in your project. Claude Code loads it when a task matches its description.

How do I install TDD in Codex?

Run `npx skills add jh941213/my-cc-harness --skill tdd -a codex`. Or copy the skill folder (skills_en/tdd in jh941213/my-cc-harness) into .agents/skills/tdd in your project. Codex loads it when a task matches its description.

Can I use TDD 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 jh941213/my-cc-harness --skill tdd -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, .gemini/skills/tdd, .github/skills/tdd and .opencode/skills/tdd in your project.

What does TDD need to run?

Going by SKILL.md and its folder, TDD needs the command-line tools its instructions call (npm). Its frontmatter pre-approves these tools: Read, Write, Edit, Bash.

Does TDD access the network?

SKILL.md contains no URLs. Its commands use npm, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is TDD safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does TDD use?

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

How many tokens does TDD use?

About 334 tokens (SKILL.md is roughly 1.3k 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?

Skills that share tags, products or a category with TDD: TDD (pietheinstrengholt/rssmonster, 564 stars), TDD Workflow (hellangleZ/burn-in-cceverywhere-ralph, 112 stars), TDD (sanity-io/sanity, 6.4k stars) and Test Driven Development (farm-fe/farm, 5.6k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains TDD?

jh941213 (a GitHub user) maintains it in jh941213/my-cc-harness, which has 126 GitHub stars. The repository holds 62 skills in this directory. The repository was last updated on August 3, 2026.

Source: jh941213/my-cc-harness on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.