A plugin for specification-driven software development, where written requirements guide implementation and checks. It adds a disciplined process for using specifications, tests, and quality checkpoints with coding agents.

Use it to organize specification-based development, support test-driven workflows, and apply process or quality gates while an AI coding agent works on software.

When requirements and implementation drift apart, work becomes harder to review and maintain. This helps keep development activities tied to an explicit specification and its checks.

spex — Plugin for Claude Code by rhuss/cc-spex

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/rhuss/cc-spex

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/plugins/rhuss/cc-spex/spex/github.svg)](https://agentmods.dev/plugins/rhuss/cc-spex/spex)

Your own site

<a href="https://agentmods.dev/plugins/rhuss/cc-spex/spex"><img src="https://agentmods.dev/badge/plugins/rhuss/cc-spex/spex/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.

Your own site · 80×15

<a href="https://agentmods.dev/plugins/rhuss/cc-spex/spex"><img src="https://agentmods.dev/badge/plugins/rhuss/cc-spex/spex.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

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

When invoked not measured The manifest loads nothing itself; its 1 skill, 8 commands cost 183 tokens a session between them.

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.

Security

Grade A, and why

spex 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 5d 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.

spex/.claude-plugin/plugin.json · 26 lines

What it actually says

{
  "name": "spex",
  "version": "6.1.0",
  "description": "Specification-Driven Development with Process Discipline for AI Agents",
  "author": {
    "name": "Roland Huss",
    "email": "[email protected]"
  },
  "license": "MIT",
  "repository": "https://github.com/rhuss/cc-spex",
  "homepage": "https://github.com/rhuss/cc-spex",
  "keywords": [
    "claude-code",
    "plugin",
    "specification-driven-development",
    "spex",
    "specs",
    "test-driven-development",
    "tdd",
    "process-discipline",
    "quality-gates",
    "extensions"
  ],
  "hooks": "./hooks.json"
}

Contents

What it installs

The manifest is a name and a version. 1 skill, 8 commands travel with it, and installing the plugin installs all of them — 183 tokens a session between them. Each is measured on its own page, and each can be installed alone.

Files

What ships with it

1 file beside plugin.json 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.

hooks.json 690 B

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.

5d ago Changed 7a15ee2d3673
8d ago Changed a8432a189830
1mo ago First seen · 26 lines scan A 3816aad9d08b

Subscribe to this mod's changes

spex is a plugin published in the GitHub repository rhuss/cc-spex (120 stars, last pushed 2d ago), licensed Apache-2.0. 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.

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