tdd-red

tdd-red is an agent for coding agents from msbaek/msbaek-claude-plugins. It costs 48 tokens per session (4,125 once invoked), scanned A, original, no licence file.

A TDD agent handles the Red phase by writing only a test that fails. TDD, or test-driven development, uses a cycle of writing a failing test, making it pass, and then improving the code.

In plain words
What is it for?
Use it as the first step in a TDD cycle for a feature or test scenario, before writing the implementation.
Why use it?
Separating the first phase prevents implementation work from being mixed into the test-design step. The failure proves that the test checks behavior not yet provided by the code.

Agent

Part of the msbaek-tdd plugin — 28 skills, 10 agents, 2 hooks shipped together

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 agents/msbaek/msbaek-claude-plugins/tdd-red
Clone the repo
git clone --depth 1 https://github.com/msbaek/msbaek-claude-plugins

Or install msbaek-tdd, the plugin that ships this one along with the rest of its 28 skills, 10 agents, 2 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for tdd-red

README.md
[![agentmods](https://agentmods.dev/badge/agents/msbaek/msbaek-claude-plugins/tdd-red.svg)](https://agentmods.dev/agents/msbaek/msbaek-claude-plugins/tdd-red)
Your own site
<a href="https://agentmods.dev/agents/msbaek/msbaek-claude-plugins/tdd-red"><img src="https://agentmods.dev/badge/agents/msbaek/msbaek-claude-plugins/tdd-red.svg" alt="Measured on agentmods" height="20"></a>
Per session 48 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 4,125 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. 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 $0.00048 $0.04125
Opus 5 $0.00024 $0.02063
Sonnet 5 $0.00010 $0.00825
Haiku 4.5 $0.00005 $0.00413

Measured yesterday against content hash d2177e72e177, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

tdd-red scanned grade A with 0 findings 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 yesterday.

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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

msbaek-tdd/agents/tdd-red.md · 248 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. yesterday Changed · +40 lines d2177e72e177
  2. 5d ago First seen · 208 lines · 48 tokens per session scan A 8904fa16cab2

Subscribe to this mod's changes

tdd-red is an agent published in the GitHub repository msbaek/msbaek-claude-plugins (8 stars, last pushed 2d ago), with no licence file. It adds 48 tokens to every session and 4,125 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Related

Other agents, from other repositories

gem-implementer

TDD code implementation: features, bugs, refactoring. Never reviews own work.

github/awesome-copilot · 22 tokens

project-implementer

Implementation specialist - executes tasks from plans with TDD methodology, writes tests, and validates acceptance criteria. Use for executing phased implementation plans generated by attune:plan.

athola/claude-night-market · 38 tokens

harness-task-executor

Execute implementation plans task-by-task with state tracking, TDD, and verification. Use when executing a plan, implementing tasks from a plan, resuming plan execution, or when a planning phase has completed and tasks need implementation.

Intense-Visions/harness-engineering · 51 tokens

executor

Specialized agent for executing implementation plans. Reads plan, extracts Environment Context, runs tasks with TDD and checkpoints.

datit309/supergraph · 25 tokens

spec-test

Субагент для анализа тестируемости спецификаций. НЕ вызывай напрямую — используется через /spec-review команду. Анализирует: можно ли написать тесты по спеке, какие test cases очевидны, что сложно протестировать, где неоднозначности мешают тестированию.

dapi/claude-code-marketplace · 64 tokens

ai-programmer

Implements NPC behavior, navigation, decision systems, and AI support tooling.

MRCalderon3D/everything-game-dev-code · 19 tokens