What is cc-best-practices-marketplace CLAUDE.md?

Repository instructions for a Claude Code plugin marketplace, a collection where Claude Code extensions are listed and installed, containing a best-practices workflow plugin.

Use them to set up, verify, learn, refactor, and audit the best-practices plugin and to understand how its marketplace files are organized.

They explain the repository layout and the rules for its Markdown, JSON, templates, skills, hooks, and verification workflow.

How kulmam92/cc-best-practices-marketplace configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to kulmam92/cc-best-practices-marketplace. 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/kulmam92/cc-best-practices-marketplace/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/kulmam92/cc-best-practices-marketplace

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/kulmam92/cc-best-practices-marketplace/claude-md/github.svg)](https://agentmods.dev/instructions/kulmam92/cc-best-practices-marketplace/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/kulmam92/cc-best-practices-marketplace/claude-md"><img src="https://agentmods.dev/badge/instructions/kulmam92/cc-best-practices-marketplace/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/kulmam92/cc-best-practices-marketplace/claude-md"><img src="https://agentmods.dev/badge/instructions/kulmam92/cc-best-practices-marketplace/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,271 This file is loaded in full into every session.

When invoked 1,271 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	$0.01271	$0.01271
Opus 5.5	$0.00508	$0.00508
Sonnet 5.5	$0.00254	$0.00254
Haiku 4.5	$0.00127	$0.00127

Measured 2mo ago against content hash d247f85913b6, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cc-best-practices-marketplace 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 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.md · 86 lines

How it starts

The opening of the file, as written. The whole thing — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

This is a Claude Code plugin marketplace containing the cc-best-practices plugin -- a workflow system based on Boris Cherny's Claude Code recommendations. It is a content-only project (no build, no tests, no dependencies). All files are Markdown, JSON, or templates.

Repository Structure

.claude-plugin/marketplace.json   -- marketplace manifest (lists available plugins)
plugins/cc-best-practices/
  .claude-plugin/plugin.json      -- plugin manifest (name, version, metadata)
  hooks/hooks.json                -- SessionStart hook (lightweight banner only)
  skills/                         -- 5 skills + 1 template, each in its own directory
    bp-setup/SKILL.md             -- deploys CLAUDE.md + rules/ + hooks + agents
    bp-verify/SKILL.md            -- run full verification loop
    bp-learn/SKILL.md             -- capture team rules (CLAUDE.md/rules/lint)
    bp-refactor/SKILL.md          -- safe refactoring with characterization tests
    bp-audit/SKILL.md             -- setup health check (budget, duplicates, graduation)
    _template/SKILL.md            -- template for creating new skills

Architecture: Three-Layer Enforcement

The plugin uses three enforcement modes with different strengths:

Advisory (~38-line CLAUDE.md template + .claude/rules/) -- deployed by /bp-setup, loaded every session
Prompting (Stop/PreToolUse hooks) -- deployed by /bp-setup via enforcement profiles (minimal/standard/strict)
Deterministic (PostToolUse hooks, lint rules) -- deployed by /bp-setup, cannot be bypassed

Skills load lazily only when invoked. SessionStart hook fires once per session (lightweight banner). All enforcement hooks are opt-in via bp-setup.

See DESIGN_DECISIONS.md for full rationale.

Design Principle: Ramp, Not a Wall

The plugin provides workflow discipline without imposing opinions or forcing adoption. Every feature degrades gracefully:

Don't want hooks? → Uninstall plugin, keep CLAUDE.md and rules
Don't want rules? → Delete the files. CLAUDE.md still works
Working solo? → Everything defaults to personal/local settings
Working on a team? → Everything defaults to shared settings with PR review

Read the full file on GitHub · 86 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.

2mo ago First seen · 86 lines · 1,271 tokens per session scan A d247f85913b6

Subscribe to this mod's changes

cc-best-practices-marketplace CLAUDE.md is an instructions file published in the GitHub repository kulmam92/cc-best-practices-marketplace (2 stars, last pushed 7mo ago), licensed MIT. It adds 1,271 tokens to every session, about $0.0051 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.

cc-best-practices-marketplace CLAUDE.md next to 6 instructions from other repositories
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cc-best-practices-marketplace: Instructions file for Claude Code