A Test-Driven Development command that writes failing tests first, adds the smallest implementation that passes them, and then refactors the code.

Use it to create and implement tests for features such as user authentication while checking modularity, coverage, and code clarity.

It provides a repeatable way to build behaviour from tests and check the result before improving the design.

How glassBead-tc/widescreen-research configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to glassBead-tc/widescreen-research. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/glassBead-tc/widescreen-research/main/.claude/commands/sparc/tdd.md

Clone the repo

git clone --depth 1 https://github.com/glassBead-tc/widescreen-research

Made for: Claude Code.

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/glassbead-tc/widescreen-research/tdd.svg)](https://agentmods.dev/commands/glassbead-tc/widescreen-research/tdd)

Your own site

<a href="https://agentmods.dev/commands/glassbead-tc/widescreen-research/tdd"><img src="https://agentmods.dev/badge/commands/glassbead-tc/widescreen-research/tdd.svg" alt="Measured on agentmods" height="20"></a>

Per session 35 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 565 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

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	$0.00035	$0.00565
Opus 5	$0.00017	$0.00282
Sonnet 5	$0.00007	$0.00113
Haiku 4.5	$0.00003	$0.00056

Measured 6d ago against content hash e51c19369ecb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

sparc-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 6d 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/sparc/tdd.md · 84 lines

How it starts

The opening of the file, as written. The whole thing — 84 lines — stays where its author put it; the contents beside it link to each section on GitHub.

🧪 Tester (TDD)

Role Definition

You implement Test-Driven Development (TDD, London School), writing tests first and refactoring after minimal implementation passes.

Custom Instructions

Write failing tests first. Implement only enough code to pass. Refactor after green. Ensure tests do not hardcode secrets. Keep files < 500 lines. Validate modularity, test coverage, and clarity before using attempt_completion.

Available Tools

read: File reading and viewing
edit: File modification and creation
browser: Web browsing capabilities
mcp: Model Context Protocol tools
command: Command execution

Usage

Option 1: Using MCP Tools (Preferred in Claude Code)

mcp__claude-flow__sparc_mode {
  mode: "tdd",
  task_description: "create user authentication tests",
  options: {
    namespace: "tdd",
    non_interactive: false
  }
}

Option 2: Using NPX CLI (Fallback when MCP not available)

# Use when running from terminal or MCP tools unavailable
npx claude-flow sparc run tdd "create user authentication tests"

# For alpha features
npx claude-flow@alpha sparc run tdd "create user authentication tests"

# With namespace
npx claude-flow sparc run tdd "your task" --namespace tdd

# Non-interactive mode
npx claude-flow sparc run tdd "your task" --non-interactive

Option 3: Local Installation

# If claude-flow is installed locally
./claude-flow sparc run tdd "create user authentication tests"

Memory Integration

Using MCP Tools (Preferred)

// Store mode-specific context
mcp__claude-flow__memory_usage {
  action: "store",
  key: "tdd_context",
  value: "important decisions",
  namespace: "tdd"
}

// Query previous work
mcp__claude-flow__memory_search {
  pattern: "tdd",
  namespace: "tdd",
  limit: 5
}

Using NPX CLI (Fallback)

# Store mode-specific context
npx claude-flow memory store "tdd_context" "important decisions" --namespace tdd

# Query previous work
npx claude-flow memory query "tdd" --limit 5

Read the full file on GitHub · 84 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.

6d ago First seen · 84 lines · 35 tokens per session scan A e51c19369ecb

Subscribe to this mod's changes

sparc-tdd is a command published in the GitHub repository glassBead-tc/widescreen-research (6 stars, last pushed 10mo ago), licensed MIT. It adds 35 tokens to every session and 565 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.

TDD Testing

widescreen-research: Command for Claude Code