tdd

A development method that writes a failing test first, makes it pass, and then improves the code; this cycle is called red-green-refactor.

In plain words
What is it for?
Use it for test-first development, integration tests, feature work, and bug fixes.
Why use it?
It helps define expected behaviour before implementation and catch regressions while building features or fixing bugs.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/udecode/dotai/tdd
Any agent
npx skills add udecode/dotai --skill tdd
Clone the repo
git clone --depth 1 https://github.com/udecode/dotai

Made for: Claude Code, Codex.

Per session 45 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,439 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00045 $0.02439
Opus 5 $0.00023 $0.01220
Sonnet 5 $0.00009 $0.00488
Haiku 4.5 $0.00005 $0.00244

Measured 2d ago against content hash 5818e2fa78cc, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

tdd scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

fetch: (endpoint, options) => fetch(endpoint, options),
skills/tdd/SKILL.md · 326 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 326 lines · 45 tokens per session scan A 5818e2fa78cc

Subscribe to this mod's changes

tdd is a skill published in the GitHub repository udecode/dotai (1,153 stars, last pushed 10d ago), with no licence file. It adds 45 tokens to every session and 2,439 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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