An add-on that enforces test-driven development (TDD), a method where you write a test before the code that should pass it.

It is for keeping test-first development in place while building or changing software.

It helps prevent coding work from skipping the tests that define the expected behaviour.

tdd-guard — Plugin by nizos

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.

Claude Code

/plugin marketplace add nizos/tdd-guard

agentmods

npx agentmods add plugins/nizos/tdd-guard/plugin

Clone the repo

git clone --depth 1 https://github.com/nizos/tdd-guard

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

tdd-guard 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.

plugin/.claude-plugin/plugin.json · 18 lines

What it actually says

{
  "name": "tdd-guard",
  "version": "1.3.0",
  "description": "Automated Test-Driven Development enforcement",
  "author": {
    "name": "Nizar Selander"
  },
  "repository": "https://github.com/nizos/tdd-guard",
  "license": "MIT",
  "keywords": [
    "tdd",
    "test-driven-development",
    "testing",
    "hooks",
    "code-quality"
  ]
}

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.

yesterday First seen · 18 lines scan A 5ebf572754af

Subscribe to this mod's changes

tdd-guard is a plugin published in the GitHub repository nizos/tdd-guard (2,318 stars, last pushed 16d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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.

Code review Data and AI Testing agentic-coding automation claude-code code-quality hooks llm-tools

tdd-guard

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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