What is claude-plugins CLAUDE.md?

Repository instructions for claude-plugins, a collection of add-ons for Claude Code. They explain the folder layout, how to add a plugin, and how to validate the marketplace catalog.

Use them to create a plugin directory, add its manifest and marketplace entry, inspect the tax-advisor structure, and run plugin validation.

They provide the project rules needed to add plugins without missing required files or catalog entries. The repository includes a tax-advisor plugin with tax-related reference material and agents.

How austinfox/claude-plugins configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to austinfox/claude-plugins. 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/austinfox/claude-plugins/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/austinfox/claude-plugins

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/instructions/austinfox/claude-plugins/claude-md/github.svg)](https://agentmods.dev/instructions/austinfox/claude-plugins/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/austinfox/claude-plugins/claude-md"><img src="https://agentmods.dev/badge/instructions/austinfox/claude-plugins/claude-md/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/instructions/austinfox/claude-plugins/claude-md"><img src="https://agentmods.dev/badge/instructions/austinfox/claude-plugins/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 552 This file is loaded in full into every session.

When invoked 552 The same file — it is already loaded in full.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00552	$0.00552
Opus 5.5	$0.00221	$0.00221
Sonnet 5.5	$0.00110	$0.00110
Haiku 4.5	$0.00055	$0.00055

Measured 1mo ago against content hash 176513c39ea6, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

claude-plugins CLAUDE.md 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 1mo 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.md · 67 lines

How it starts

The opening of the file, as written. The whole thing — 67 lines — stays where its author put it; the contents beside it link to each section on GitHub.

austinfox-claude-plugins — Development Guide

Project Overview

This is a Claude Code plugin marketplace containing plugins by Austin Fox. Each plugin lives in its own subdirectory under plugins/.

Structure

.claude-plugin/marketplace.json    Marketplace catalog (lists all plugins)
plugins/
  tax-advisor/                     Tax advisor plugin
    .claude-plugin/plugin.json       Plugin manifest
    skills/tax-advisor/              Auto-triggered skill + on-demand federal, state, profile, and international references
    commands/tax-advisor.md            /tax-advisor slash command with routing logic
    agents/                          4 specialized subagents
    scripts/                         Bootstrap script for IRS, FinCEN, SSA, WA DOR, CA FTB, and Skatteverket sources
    tax-knowledge/                   Generated knowledge base (gitignored, per-user)

Adding a New Plugin

Create plugins/<plugin-name>/ with the standard plugin layout (agents/, commands/, skills/)
Add .claude-plugin/plugin.json inside the plugin directory
Add an entry to .claude-plugin/marketplace.json in the plugins array
Run claude plugin validate . to verify

Tax Advisor Plugin

Bootstrap the knowledge base

cd plugins/tax-advisor/scripts && bun install && bun run bootstrap-knowledge.ts

Use --force to re-download. Auto-refreshes every 30 days.

Test locally

claude --plugin-dir plugins/tax-advisor

Then try /tax-advisor or mention taxes in conversation.

Conventions

Reference documents in skills/tax-advisor/references/ are loaded on-demand — keep them under 500 lines each
Agents use ${CLAUDE_PLUGIN_ROOT} for all paths
All tax figures and material conclusions must cite current primary authority for the relevant tax year
Strategies are risk-rated: Conservative / Moderate / Aggressive
Quantify when supported by the user's inputs; never fabricate precision
Bootstrap URLs break when government sites restructure — update the relevant source group in bootstrap-knowledge.ts

Read the full file on GitHub · 67 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.

1mo ago First seen · 67 lines · 552 tokens per session scan A 176513c39ea6

Subscribe to this mod's changes

claude-plugins CLAUDE.md is an instructions file published in the GitHub repository austinfox/claude-plugins (4 stars, last pushed 3mo ago), licensed MIT. It adds 552 tokens to every session, about $0.0022 per session on Opus 5.5. 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.

Claude Code claude claude-code-plugin irs tax-planning washington-state

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 9,649 tokens

claude-plugins: Instructions file for Claude Code