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test-writer

test-writer is a command for Claude Code from hamzafarooq/claude-code-starter. It costs 0 tokens per session (51 once invoked), scanned A, original, MIT.

A command that writes unit tests for functions, including normal, edge, and error cases. TDD means writing tests as part of the development process, often before the code itself.

In plain words
What is it for?
Adding test coverage to existing functions, creating tests for new code, or practising test-driven development.
Why use it?
It reduces the work of deciding which cases to test and helps avoid missing unusual inputs or failures.

Command for Claude Code

Written for Claude Code: $ARGUMENTS substitution.

not rated 150repo 26d ago A scan 0 tokens original MIT

Good fit Adding test coverage to existing functions, creating tests for new code, or practising test-driven development.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/hamzafarooq/claude-code-starter/test-writer
View source ↗ hamzafarooq/claude-code-starter
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.

Clone the repo
git clone --depth 1 https://github.com/hamzafarooq/claude-code-starter

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.

agentmods badge for test-writer

README.md
[![agentmods](https://agentmods.dev/badge/commands/hamzafarooq/claude-code-starter/test-writer/github.svg)](https://agentmods.dev/commands/hamzafarooq/claude-code-starter/test-writer)
Your own site
<a href="https://agentmods.dev/commands/hamzafarooq/claude-code-starter/test-writer"><img src="https://agentmods.dev/badge/commands/hamzafarooq/claude-code-starter/test-writer/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 test-writer

Your own site · 80×15
<a href="https://agentmods.dev/commands/hamzafarooq/claude-code-starter/test-writer"><img src="https://agentmods.dev/badge/commands/hamzafarooq/claude-code-starter/test-writer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 51 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 $0.00000 $0.00051
Opus 5.5 $0.00000 $0.00020
Sonnet 5.5 $0.00000 $0.00010
Haiku 4.5 $0.00000 $0.00005

Measured 2mo ago against content hash 069dd250cbec, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

test-writer 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 2mo 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/test-writer.md · 6 lines

What it actually says

Run the test-writer skill.

Write unit tests for any function — happy path, edge cases, and error cases. Use when the user asks for tests, wants to add test coverage, or is practicing TDD.

$ARGUMENTS

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. 2mo ago First seen · 6 lines · 0 tokens per session scan A 069dd250cbec

Subscribe to this mod's changes

test-writer is a command published in the GitHub repository hamzafarooq/claude-code-starter (150 stars, last pushed 26d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 51 tokens. 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.

TestingUnit testing
Related

test-writer compared with commands from other repositories

test-writer next to 6 commands from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
test-writerhamzafarooq/claude-code-starterCommand15026d agoMITA0Claude Code
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test-tddguanyang/open-agent-hubCommand986yesterdayMITA32Claude Code
kill-mutantsswingerman/engineerCommand16210d agoMITA29Claude Code
lg:nodeTheLobbi/claudeCommand217d agoMITA34Claude Code
test-auditacaprino/daodanCommand94d agoMITA88Claude Code
story-and-testepam/ai-dial-ui-kitCommand10todayApache-2.0A0Claude Code, Cursor