A guided process for discovering the architecture of a new project before coding begins. Greenfield means a project built from the beginning rather than extending an existing system.

Use it to explore the technical landscape and plan a new project's structure.

It helps clarify requirements, technical choices, and architecture decisions before they become expensive to change.

trailhead — Plugin for Claude Code by HartBrook

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/HartBrook/trailhead

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/hartbrook/trailhead/trailhead/github.svg)](https://agentmods.dev/plugins/hartbrook/trailhead/trailhead)

Your own site

<a href="https://agentmods.dev/plugins/hartbrook/trailhead/trailhead"><img src="https://agentmods.dev/badge/plugins/hartbrook/trailhead/trailhead/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/hartbrook/trailhead/trailhead"><img src="https://agentmods.dev/badge/plugins/hartbrook/trailhead/trailhead.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 2 skills cost 39 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

trailhead 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-plugin/marketplace.json#trailhead · 27 lines

What it actually says

{
  "name": "trailhead",
  "source": "./src",
  "description": "Guided architecture discovery for greenfield projects. Know the terrain before you commit to the trail.",
  "version": "0.1.0",
  "author": {
    "name": "HartBrook"
  },
  "repository": "https://github.com/HartBrook/trailhead",
  "license": "MIT",
  "keywords": [
    "architecture",
    "discovery",
    "greenfield",
    "planning",
    "adr",
    "requirements"
  ],
  "agents": [
    "./agents/tech-scout.md"
  ],
  "skills": [
    "./skills/trailhead",
    "./skills/discovery-methodology"
  ],
  "strict": false
}

Contents

What it installs

The manifest is a name and a version. 2 skills travel with it, and installing the plugin installs all of them — 39 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 marketplace.json#trailhead 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.

marketplace.json 753 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.

2mo ago First seen · 27 lines scan A 32c3dd1e0744

Subscribe to this mod's changes

trailhead is a plugin published in the GitHub repository HartBrook/trailhead (6 stars, last pushed 8mo 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 2026-09-03.

Planning

trailhead next to 6 plugins from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
trailheadHartBrook/trailhead	Plugin	6	8mo ago	MIT	A	—	Claude Code
humanizerblader/humanizer	Plugin	68k	yesterday	MIT	A	—	Claude Code
claude-plugins-official marketplaceanthropics/claude-plugins-official	Plugin	47k	today	Apache-2.0	A	—	Claude Code
nextjsvercel/next.js	Plugin	143k	today	MIT	A	—	Claude Code
themes-examplegoogle-gemini/gemini-cli	Plugin	109k	today	Apache-2.0	A	—	Gemini CLI
knowledge-work-plugins marketplaceanthropics/knowledge-work-plugins	Plugin	35k	yesterday	Apache-2.0	A	—	Claude Code
code-modernizationanthropics/claude-plugins-official	Plugin	47k	today	Apache-2.0	A	—	Claude Code