beagle CLAUDE.md

beagle CLAUDE.md is an instructions file for coding agents from existential-birds/beagle. It costs 2,129 tokens per session, scanned B, a copy of beagle AGENTS.md, Apache-2.0.

Repository instructions for Claude Code, an AI coding assistant, covering a plugin marketplace and its local development settings.

In plain words
What is it for?
Working on the Beagle marketplace, its framework-specific plugins, local development, pre-push reviews, and GitHub bot feedback.
Why use it?
They give the assistant the project context and rules it needs to review code and verify changes correctly.

Instructions file

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.

agentmods
npx agentmods add instructions/existential-birds/beagle/claude-md
Clone the repo
git clone --depth 1 https://github.com/existential-birds/beagle

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.

agentmods badge for beagle CLAUDE.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/existential-birds/beagle/claude-md.svg)](https://agentmods.dev/instructions/existential-birds/beagle/claude-md)
Your own site
<a href="https://agentmods.dev/instructions/existential-birds/beagle/claude-md"><img src="https://agentmods.dev/badge/instructions/existential-birds/beagle/claude-md.svg" alt="Measured on agentmods" height="20"></a>
Per session 2,129 This file is loaded in full into every session.
When invoked 2,129 The same file — it is already loaded in full.
Security scan B 1 finding. Scan, not verified.
Origin 88% copy Near-identical to another mod 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.

ModelPer sessionOnce invoked
Fable 5 $0.02129 $0.02129
Opus 5 $0.01064 $0.01064
Sonnet 5 $0.00426 $0.00426
Haiku 4.5 $0.00213 $0.00213

Measured 3d ago against content hash 039d34845a20, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

beagle CLAUDE.md scanned grade B with 1 finding 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 3d 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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

# In Claude Code settings (~/.claude/settings.json)
Origin

This is a copy

88% identical to beagle AGENTS.md — 28 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

CLAUDE.md · 130 lines

How it starts

The opening of the file, as written. The whole thing — 130 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.

What This Is

Beagle is a Claude Code plugin marketplace providing framework-aware code review skills and verification workflows for pre-push reviews and GitHub bot feedback handling. It contains 10 focused plugins with 132 skills.

Marketplace Architecture

beagle/
├── .claude-plugin/
│   └── marketplace.json         # Marketplace manifest (10 plugins)
└── plugins/
    ├── beagle-core/             # Shared workflows, verification, git workflows, skill tooling (19 skills)
    ├── beagle-python/           # Python, FastAPI, SQLAlchemy, PostgreSQL, pytest (7 skills)
    ├── beagle-go/               # Go, BubbleTea, Wish SSH, Prometheus (13 skills)
    ├── beagle-elixir/           # Elixir, Phoenix, LiveView, ExUnit, ExDoc (11 skills)
    ├── beagle-ios/              # Swift, SwiftUI, SwiftData, iOS frameworks (16 skills)
    ├── beagle-react/            # React, React Flow, shadcn/ui, Tailwind, Vitest, Remix v2 (28 skills)
    ├── beagle-rust/             # Rust, tokio, axum, sqlx, serde (12 skills)
    ├── beagle-ai/               # Pydantic AI, LangGraph, DeepAgents, Vercel AI SDK (deprecated)
    ├── beagle-docs/             # Documentation quality, AI writing detection (10 skills)
    ├── beagle-analysis/         # Brainstorming, ADRs, strategy, LLM-as-judge, spec resolution, PRFAQ filter, TDD plan writing (14 skills)
    └── beagle-testing/          # Test plan generation and execution (2 skills)

Each active plugin is a directory under plugins/ with its own README.md and skills/ directory. The marketplace manifest at .claude-plugin/marketplace.json is the only plugin manifest; individual plugin directories do not have plugin.json files.

Local Development

Test the marketplace during development:

# In Claude Code settings (~/.claude/settings.json)
{
  "plugins": ["/path/to/your/beagle"]
}

Restart Claude Code after changes to reload. Skills are discovered from plugin skills/ directories and trigger keywords in skill frontmatter. Codex support files are in .codex/INSTALL.md and docs/README.codex.md.

Read the full file on GitHub · 130 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.

  1. 3d ago First seen · 130 lines · 2,129 tokens per session scan B 039d34845a20

Subscribe to this mod's changes

beagle CLAUDE.md is an instructions file published in the GitHub repository existential-birds/beagle (79 stars, last pushed 24d ago), licensed Apache-2.0. It adds 2,129 tokens to every session, about $0.0106 per session on Opus 5. A static security scan graded it B with 1 finding (reads agent configuration directories). It is 88% identical to beagle AGENTS.md, differing in 28 lines, and is treated as a copy.

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