bmad-testarch-atdd

bmad-testarch-atdd is a skill for Claude Code, Codex from marlonvidal/tech-manager-os. It costs 40 tokens per session (827 once invoked), scanned A, original, MIT.

A tool for writing acceptance-test outlines before the related feature is built. Acceptance tests describe the behavior a feature must satisfy, while TDD, or test-driven development, is a cycle of writing a failing test, implementing the behavior, and improving the code.

In plain words
What is it for?
Use it to create red-phase acceptance-test scaffolds for new features and to practice acceptance test-driven development.
Why use it?
Starting with failing tests makes the expected result explicit before implementation and gives developers a concrete target to build toward.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

Good fit Use it to create red-phase acceptance-test scaffolds for new features and to practice acceptance test-driven development.

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Install with agentmods
npx agentmods add skills/marlonvidal/tech-manager-os/bmad-testarch-atdd
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.

Any agent
npx skills add marlonvidal/tech-manager-os --skill bmad-testarch-atdd
Clone the repo
git clone --depth 1 https://github.com/marlonvidal/tech-manager-os

Made for: Claude Code, Codex.

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 bmad-testarch-atdd

README.md
[![agentmods](https://agentmods.dev/badge/skills/marlonvidal/tech-manager-os/bmad-testarch-atdd/github.svg)](https://agentmods.dev/skills/marlonvidal/tech-manager-os/bmad-testarch-atdd)
Your own site
<a href="https://agentmods.dev/skills/marlonvidal/tech-manager-os/bmad-testarch-atdd"><img src="https://agentmods.dev/badge/skills/marlonvidal/tech-manager-os/bmad-testarch-atdd/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for bmad-testarch-atdd

Your own site · 80×15
<a href="https://agentmods.dev/skills/marlonvidal/tech-manager-os/bmad-testarch-atdd"><img src="https://agentmods.dev/badge/skills/marlonvidal/tech-manager-os/bmad-testarch-atdd.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 40 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 827 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original 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 5.1 $0.00040 $0.00827
Opus 5 $0.00020 $0.00413
Sonnet 5 $0.00008 $0.00165
Haiku 4.5 $0.00004 $0.00083

Measured 9d ago against content hash fc37ffeab69c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

bmad-testarch-atdd 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 9d 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.

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.

Origin

Copies of this mod

8 near-identical copies found in the catalogue:

.agents/skills/bmad-testarch-atdd/SKILL.md · 86 lines

How it starts

The opening of the file, as written. The whole thing — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Acceptance Test-Driven Development (ATDD)

Goal: Generate red-phase acceptance test scaffolds before implementation using TDD red-green-refactor cycle.

Role: You are the Master Test Architect.

You will continue to operate with your given name, identity, and communication_style, merged with the details of this role description.

Conventions

  • Bare paths (e.g. instructions.md) resolve from the skill root.
  • {skill-root} resolves to this skill's installed directory (where customize.toml lives).
  • {project-root}-prefixed paths resolve from the project working directory.
  • {skill-name} resolves to the skill directory's basename.
  • Resolve sibling workflow files such as instructions.md, checklist.md, steps-c/..., steps-e/..., steps-v/..., and templates from {skill-root}.

On Activation

Step 1: Resolve the Workflow Block

Run: python3 {project-root}/_bmad/scripts/resolve_customization.py --skill {skill-root} --key workflow

If the script fails, resolve the workflow block yourself by reading these three files in base → team → user order and applying the same structural merge rules as the resolver:

  1. {skill-root}/customize.toml — defaults
  2. {project-root}/_bmad/custom/{skill-name}.toml — team overrides
  3. {project-root}/_bmad/custom/{skill-name}.user.toml — personal overrides

Any missing file is skipped. Scalars override, tables deep-merge, arrays of tables keyed by code or id replace matching entries and append new entries, and all other arrays append.

Step 2: Execute Prepend Steps

Execute each entry in {workflow.activation_steps_prepend} in order before proceeding.

Step 3: Load Persistent Facts

Treat every entry in {workflow.persistent_facts} as foundational context you carry for the rest of the workflow run. Entries prefixed file: are paths or globs resolved from {project-root} — expand them and load every matching file in lexical path order as facts. All other entries are facts verbatim.

Read the full file on GitHub · 86 lines

Files

What ships with it

60 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 9d ago First seen · 86 lines · 40 tokens per session scan A fc37ffeab69c

Subscribe to this mod's changes

bmad-testarch-atdd is a skill published in the GitHub repository marlonvidal/tech-manager-os (17 stars, last pushed 2mo ago), licensed MIT. It adds 40 tokens to every session and 827 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 2026-08-30.