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Tdd Substrate

Category: Engineering  ·  Sub-category: testing  ·  Last updated:
lang:pythonlang:typescript
Test-driven development substrate for solo + small-team builds. Iron-law red-green-refactor with dual-runtime examples (Vitest for TypeScript/Next.js, pytest for Python/FastAPI), regression-test-for-every-bug pattern, property-based testing for invariants, bilingual test-fixture handling, and best-of-best-aware "pick the test design and ship" stance. Use when the user says /tdd, "write tests first", "red-green-refactor", "regression test for X", or is about to add a feature or fix a bug on any code path. Covers JavaScript/TypeScript + Python; not strictly enforced for Bash, Rust, or Go (defer to runtime-native test discipline there).

What this skill does

Tdd Substrate 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/tdd-substrate/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when the user says /tdd, "write tests first", "red-green-refactor", "regression test for X", or is about to add a feature or fix a bug on any code path. Covers JavaScript/TypeScript + Python; not strictly enforced for Bash, Rust, or Go (defer to runtime-native test discipline there).

Who uses this skill

The Tdd Substrate 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 69,000+ 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/tdd-substrate
curl -L https://claudskills.com/skills/tdd-substrate/SKILL.md \
  -o ~/.claude/skills/tdd-substrate/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/tdd-substrate/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/tdd-substrate/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\tdd-substrate\SKILL.md on Windows. See the full install guide for step-by-step instructions.

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.

See pricing → Download desktop app

Attribution & license

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Browse all Engineering skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Engineering skills → Top 100 skills
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