Atomic Tdd
Test-first discipline. Auto-triggers on "let's implement X", "add feature Y", "fix bug Z", "write a test for", "implement", "build out", and similar pre-code-change phrases. Iron rule: failing test exists before production code. Skip only for pure docs/config changes with an explicit "skipped because:" note. Explicit invocation: /atomic-tdd. Boundary with atomic-debug: this skill owns writing or changing code — new behavior, or a fix whose root cause is already understood. Diagnosing why something is broken (unknown cause) is atomic-debug's job; debug to the root cause first, then return here to write the fix test-first.
Security AStatic scan found no risk patternsHow grading works ›
From the source SKILL.md
Test first. Watch it fail. Write minimal code. Watch it pass. Refactor green.
What this skill does
Atomic Tdd is a community-contributed Claude Code skill in the testing sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/atomic-tdd/ and loads when your prompt matches the skill's trigger.
Who uses this skill
The Atomic Tdd Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 184,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
How to install
Free
Manual install (2 steps)
mkdir -p ~/.claude/skills/atomic-tdd
curl -L https://claudskills.com/skills/atomic-tdd/SKILL.md \
-o ~/.claude/skills/atomic-tdd/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/atomic-tdd/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/atomic-tdd/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\atomic-tdd\SKILL.md on Windows. See the full install guide for step-by-step instructions.
Telegram
📱 Install from your phone or desktop Telegram
Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →
Pro
One-click install via the desktop app
The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.
Pro
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
Frequently asked questions
How do I install the Atomic Tdd Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy
SKILL.md from the source repository to
~/.claude/skills/atomic-tdd/SKILL.md and restart Claude Code. Both flows are detailed at
claudskills.com/install/.
What does the Atomic Tdd skill do?
Test-first discipline. Auto-triggers on "let's implement X", "add feature Y", "fix bug Z", "write a test for", "implement", "build out", and similar pre-code-change phrases. Iron rule: failing test exists before production code. Skip only for pure docs/config changes with an explicit "skipped because:" note. Explicit invocation: /atomic-tdd. Boundary with atomic-debug: this skill owns writing or changing code — new behavior, or a fix whose root cause is already understood. Diagnosing why something is broken (unknown cause) is atomic-debug's job; debug to the root cause first, then return here to write the fix test-first.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Atomic Tdd skill?
Use Atomic Tdd when your Claude Code task falls under the Engineering category — specifically in the testing area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Atomic Tdd" or describe the task and let Claude pick). Browse related skills at
/category/engineering/.
What is a Claude Code skill and how does the Atomic Tdd skill fit in?
A Claude Code skill is a
SKILL.md file that lives under
~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Atomic Tdd is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at
/learn/what-is-a-claude-skill/.
Attribution & license
Cite this skill
If you reference this skill in a blog post, paper, or documentation, you can cite it as:
APA
damusix. (2026). Atomic Tdd [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/atomic-tdd/
BibTeX
@misc{atomic-tdd-2026,
author = {damusix},
title = {Atomic Tdd [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/atomic-tdd/}
}Embed this skill
Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →
Badge
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Security scan
Grade A · scanned 2026-08-13 — free static scan against the OWASP Agentic Skills Top 10.
No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›
- ✓ Prompt injection
- ✓ Data exfiltration
- ✓ Supply chain
- ✓ Reverse shell
- ✓ Credentials
- ✓ Execution
- ✓ Filesystem
- ✓ Persistence
- ✓ Obfuscation
- ✓ Network
Show this grade on your repo (click to copy):
[](https://claudskills.com/skills/atomic-tdd/#security)
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