beagle

Image: NASA, Public Domain. Source

Beagle is a Claude Code plugin marketplace with 124 skills across code review, documentation, testing, architectural analysis, and git workflows. Use it to review before you push, detect AI-generated artifacts, draft and improve docs, generate test plans, and analyze codebases — across Python, Go, Rust, Elixir, React, iOS/Swift, and AI frameworks.

Used with Amelia for agent-based workflows and Daydream for automated review-fix-test loops.

Installation

Prerequisites:

• Claude Code CLI installed
• agent-browser for the run-test-plan skill (optional)

# Add the marketplace
claude plugin marketplace add https://github.com/existential-birds/beagle

# Install the plugins you need
claude plugin install beagle-core@existential-birds
claude plugin install beagle-python@existential-birds
claude plugin install beagle-react@existential-birds

Verify installation by opening a new Claude Code session and running /beagle-core:commit-push — if the skill loads, the plugin is active.

To update:

claude plugin marketplace update existential-birds && claude plugin update <plugin-name>

Troubleshooting:

• "Marketplace file not found": Remove stale entries from ~/.claude/plugins/known_marketplaces.json and restart Claude Code.
• Plugin not updating: Run claude plugin marketplace update existential-birds to refresh the marketplace.

Other Agents

Use the skills CLI to install beagle skills for other AI agents:

npx skills add existential-birds/beagle

This downloads the skills and configures them for your agent.

Codex users: Link each plugin into ~/.agents/skills/ — see .codex/INSTALL.md for setup instructions.

Plugins

Plugin	Skills	Category
beagle-core	18	Shared workflows, verification, git
beagle-python	7	Python, FastAPI, SQLAlchemy, pytest
beagle-go	13	Go, BubbleTea, Wish SSH, Prometheus
beagle-elixir	11	Elixir, Phoenix, LiveView, ExUnit, ExDoc
beagle-ios	16	Swift, SwiftUI, SwiftData, iOS frameworks
beagle-react	16	React, React Flow, shadcn/ui, Tailwind
beagle-rust	10	Rust, tokio, axum, sqlx, serde
beagle-ai	13	Pydantic AI, LangGraph, DeepAgents
beagle-docs	10	Documentation quality, AI writing detection (Diataxis)
beagle-analysis	8	Brainstorming, 12-Factor, ADRs, LLM-as-judge
beagle-testing	2	Test plan generation and execution
Total	124	—

Skills

These are the canonical skill entry points for Beagle.

beagle-core

Skill	Description
review-plan <path>	Review implementation plans
review-llm-artifacts	Detect LLM coding artifacts
fix-llm-artifacts	Fix detected artifacts
commit-push	Commit and push changes
create-pr	Create PR with template
gen-release-notes <tag>	Generate release notes
receive-feedback <path>	Process review feedback
fetch-pr-feedback	Fetch bot comments from PR
respond-pr-feedback	Reply to bot comments
skill-builder	Create new skills
prompt-improver	Optimize prompts

Code Review Skills

Skill	Plugin	Description
review-python	beagle-python	Python/FastAPI code review
review-frontend	beagle-react	React/TypeScript code review
review-go	beagle-go	Go code review
review-tui	beagle-go	BubbleTea TUI code review
review-ios	beagle-ios	iOS/SwiftUI code review
review-elixir	beagle-elixir	Elixir/Phoenix code review
review-rust	beagle-rust	Rust/tokio/axum code review

Documentation & Analysis Skills

Skill	Plugin	Description
draft-docs <prompt>	beagle-docs	Generate documentation drafts
improve-doc <path>	beagle-docs	Improve docs using Diataxis
ensure-docs	beagle-docs	Documentation coverage check
review-ai-writing	beagle-docs	Detect AI writing patterns
humanize	beagle-docs	Fix AI writing with safe/risky classification
12-factor-apps-analysis	beagle-analysis	12-Factor compliance check
llm-judge	beagle-analysis	Compare implementations
write-adr	beagle-analysis	Generate ADRs from decisions

Testing Skills

Skill	Plugin	Description
gen-test-plan	beagle-testing	Generate YAML test plan
run-test-plan	beagle-testing	Execute test plan