A bug-fixing command that follows TDD and BDD. TDD means writing a failing test before the fix, while BDD describes expected behaviour in terms of user-visible scenarios.

Use it with a bug description or ticket to investigate the current and expected behaviour, write a reproducing test, implement the fix, and refactor safely.

It makes the bug reproducible before changing the code and checks that the fix works without breaking existing tests.

tdd — Command for Claude Code by TheBeardedBearSAS

Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo

git clone --depth 1 https://github.com/TheBeardedBearSAS/claude-craft

agentmods

npx agentmods add commands/thebeardedbearsas/claude-craft/tdd

Made for: Claude Code.

Or install claude-craft, the plugin that ships this one along with the rest of its 56 skills, 94 commands, 47 agents, 5 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.

README.md

[![agentmods](https://agentmods.dev/badge/commands/thebeardedbearsas/claude-craft/tdd.svg)](https://agentmods.dev/commands/thebeardedbearsas/claude-craft/tdd)

Your own site

<a href="https://agentmods.dev/commands/thebeardedbearsas/claude-craft/tdd"><img src="https://agentmods.dev/badge/commands/thebeardedbearsas/claude-craft/tdd.svg" alt="Measured on agentmods" height="20"></a>

Per session 9 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 2,243 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.

Model	Per session	Once invoked
Fable 5.1	$0.00009	$0.02243
Opus 5	$0.00005	$0.01122
Sonnet 5	$0.00002	$0.00449
Haiku 4.5	$0.00001	$0.00224

Measured 3d ago against content hash c8f175bf3a18, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

tdd 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 3d 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.

.claude/commands/qa/tdd.md · 389 lines

How it starts

The opening of the file, as written. The whole thing — 389 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Correction de Bug en Mode TDD/BDD

Tu es un développeur senior expert en TDD (Test-Driven Development) et BDD (Behavior-Driven Development). Tu dois corriger un bug en suivant strictement la méthodologie TDD/BDD : d'abord écrire un test qui échoue reproduisant le bug, puis corriger le code pour faire passer le test.

Arguments

$ARGUMENTS

Arguments :

Description du bug ou lien vers le ticket
(Optionnel) Fichier ou module concerné

Exemple : /qa:tdd "L'utilisateur ne peut pas se déconnecter" ou /qa:tdd #123

MISSION

Philosophie TDD/BDD

RED → GREEN → REFACTOR

1. RED    : Écrire un test qui échoue (reproduit le bug)
2. GREEN  : Écrire le minimum de code pour faire passer le test
3. REFACTOR : Améliorer le code sans casser les tests

Étape 1 : Comprendre le Bug

Collecter les informations

Description précise du comportement actuel
Comportement attendu
Étapes de reproduction
Environnement concerné
Logs/stack traces disponibles

Questions à se poser

Quel est le comportement actuel ?
Quel devrait être le comportement correct ?
Quand le bug a-t-il été introduit ? (git bisect si nécessaire)
Quels sont les cas limites ?
Y a-t-il des tests existants qui auraient dû catcher ce bug ?

Étape 2 : RED - Écrire le Test qui Échoue

Format BDD (Gherkin-style)

Feature: [Fonctionnalité concernée]
  En tant que [type d'utilisateur]
  Je veux [action]
  Afin de [bénéfice]

  Scenario: [Description du cas de bug]
    Given [contexte/état initial]
    When [action qui déclenche le bug]
    Then [comportement attendu qui ne se produit pas actuellement]

Test Unitaire

# Python - pytest
class TestBugFix:
    """
    Bug: [Description courte]
    Ticket: #XXX

    Comportement actuel: [ce qui se passe]
    Comportement attendu: [ce qui devrait se passer]
    """

    def test_should_[expected_behavior]_when_[condition](self):
        # Arrange - Préparer le contexte
        # ...

        # Act - Exécuter l'action qui cause le bug
        # ...

        # Assert - Vérifier le comportement attendu
        # Ce test DOIT échouer avant le fix
        assert result == expected_value

Read the full file on GitHub · 389 lines

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.

3d ago First seen · 389 lines · 9 tokens per session scan A c8f175bf3a18

Subscribe to this mod's changes

tdd is a command published in the GitHub repository TheBeardedBearSAS/claude-craft (105 stars, last pushed 4d ago), licensed MIT. It adds 9 tokens to every session and 2,243 once invoked, about $0.0000 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 2026-09-03.

Claude Code Debugging TDD Testing agents ai-tools bmad clean-architecture ddd

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