Image: NASA, Public Domain. Source Beagle is an Agent Skills marketplace: framework-aware code review, documentation, testing, architectural analysis, and git workflows for any compatible coding agent.
FAQ
beagle is a Claude Code plugin with 145 hand-picked skills for development work, indexed on Flowy. Install it with the command on its page. It includes deepagents-architecture, deepagents-code-review, deepagents-implementation. Its skills do not fire on their own yet. Request auto-invocation to have Flowy route them as you prompt. Free and open source.
> /plugin marketplace add existential-birds/beagle
Repo: existential-birds/beagle

Image: NASA, Public Domain. Source
Beagle is an Agent Skills marketplace: framework-aware code review, documentation, testing, architectural analysis, and git workflows for any compatible coding agent. Skills cover Python, Go, Rust, Elixir, React, Remix v2, and iOS/Swift.
Install for any agent: npx skills add existential-birds/beagle. Then your agent loads the right skill automatically, or you run one by name (for example review-python).
Pairs with Amelia for agent-based workflows and Daydream for automated review-fix-test loops.
Prerequisites:
run-test-plan skill (optional)Install with the skills CLI:
npx skills add existential-birds/beagle
This downloads the skills and configures them for your agent. Codex users: see .codex/INSTALL.md and docs/README.codex.md.
claude plugin marketplace add https://github.com/existential-birds/beagle
claude plugin install beagle-core@existential-birds
Install additional plugins as needed (for example beagle-python@existential-birds). Update with:
claude plugin marketplace update existential-birds && claude plugin update <plugin-name>
If a marketplace file is reported missing, remove stale entries from ~/.claude/plugins/known_marketplaces.json and restart.
Each plugin's README lists its skills. For every skill in one place, see the full catalog.
| Plugin | Coverage |
|---|---|
| beagle-core | Shared workflows, verification, git, skill tooling |
| beagle-python | Python, FastAPI, SQLAlchemy, PostgreSQL, pytest |
| beagle-go | Go, BubbleTea, Wish SSH, Prometheus |
| beagle-elixir | Elixir, Phoenix, LiveView, ExUnit, ExDoc |
| beagle-ios | Swift, SwiftUI, SwiftData, iOS frameworks |
| beagle-react | React, React Flow, shadcn/ui, Tailwind, Remix v2 |
| beagle-rust | Rust, tokio, axum, sqlx, serde |
| beagle-docs | Documentation quality, AI-writing detection (Diataxis) |
| beagle-analysis | Brainstorming, ADRs, strategy, LLM-as-judge, TDD planning |
| beagle-testing | Test plan generation and execution |
Your agent discovers every skill automatically; these are the headline ones, grouped by task. The full catalog lists them all.
Code review โ review-python, review-frontend, review-remix-v2 (beagle-react); review-go, review-tui (beagle-go); review-rust, review-elixir, review-ios.
Git & feedback โ commit-push, create-pr, gen-release-notes, fetch-pr-feedback, respond-pr-feedback, receive-feedback.
LLM artifacts โ review-llm-artifacts, verify-llm-artifacts, fix-llm-artifacts.
Docs โ improve-doc, draft-docs, ensure-docs, review-ai-writing, humanize-beagle.
Analysis & planning โ review-plan, write-adr, brainstorm-beagle, write-plan, quick-plan, llm-judge, strategy-interview, prfaq-beagle, web-research.
Testing โ gen-test-plan, run-test-plan.
Skill tooling โ skill-builder, review-skill.
.claude/
.claude-plugin/
marketplace.json
commands/
release-tag.md
release.md
settings.json
.codex/
config.toml
hooks.json
INSTALL.md
.cursor/
hooks.json
.entire/
settings.json
.feedback-log.csv
.github/
ISSUE_TEMPLATE/
bug_report.md
config.yml
feature_request.md
skill_request.md
PULL_REQUEST_TEMPLATE.md
workflows/
daydream-command.yml
daydream-post.yml
daydream-review.yml
README.md
.gitignore
.opencode/
plugins/
entire.ts
.pi/
extensions/
entire/
index.ts
AGENTS.md
assets/
Stafford_and_Snoopy.jpg
CHANGELOG.md
CLAUDE.md
CONTRIBUTING.md
docs/
README.codex.md
LICENSE
llms.txt
plugins/
beagle-ai/
.claude-plugin/
plugin.json
README.md
skills/
deepagents-architecture/
SKILL.md
deepagents-code-review/
references/
checklist.md
SKILL.md
deepagents-implementation/
references/
patterns.md
tools.md
SKILL.md
langgraph-architecture/
SKILL.md
langgraph-code-review/
SKILL.md
langgraph-implementation/
PATTERNS.md
SKILL.md
pydantic-ai-agent-creation/
SKILL.md
pydantic-ai-common-pitfalls/
SKILL.md
pydantic-ai-dependency-injection/
SKILL.md
pydantic-ai-model-integration/
SKILL.md
pydantic-ai-testing/
SKILL.md
pydantic-ai-tool-system/
SKILL.md
vercel-ai-sdk/
references/
messages.md
streaming.md
tools.md
use-chat.md
SKILL.md
beagle-analysis/
.claude-plugin/
plugin.json
README.md
skills/
adr-decision-extraction/
SKILL.md
adr-writing/
references/
definition-of-done.md
madr-template.md
scripts/
next_adr_number.py
SKILL.md
agent-architecture-analysis/
references/
factors.md
SKILL.md
artifact-analysis/
references/
citation-schema.md
companion-contract.md
failure-modes.md
report-template.md
skip-patterns.md
subagent-brief.md
SKILL.md
brainstorm-beagle/
references/
spec-reviewer.md
spec-template.md
SKILL.md
llm-judge/
references/
fact-schema.md
judge-agents.md
repo-agent.md
scoring-rubrics.md
SKILL.md
prfaq-beagle/
references/
companion-contract.md
customer-faq.md
internal-faq.md
press-release.md
prfaq-template.md
verdict.md
SKILL.md
quick-plan/
references/
fanout-brief.md
SKILL.md
resolve-beagle/
references/
subagent-prompts.md
SKILL.md
strategy-interview/
references/
bad-strategy.md
blue-ocean.md
kernel.md
output-template.md
playing-to-win.md
pressure-tests.md
wardley-mapping.md
SKILL.md
strategy-review/
references/
interview-lens-audit.md
judge-artifact-schema.md
pressure-tests.md
review-dimensions.md
review-lenses.md
review-template.md
SKILL.md
web-research/
references/
citation-schema.md
companion-contract.md
failure-modes.md
report-template.md
subagent-brief.md
SKILL.md
write-adr/
SKILL.md
write-plan/
references/
plan-reviewer.md
plan-template.md
SKILL.md
beagle-core/
.claude-plugin/
plugin.json
README.md
skills/
commit-push/
SKILL.md
create-pr/
SKILL.md
fetch-pr-feedback/
SKILL.md
fix-llm-artifacts/
SKILL.md
gen-release-notes/
SKILL.md
llm-artifacts-detection/
references/
abstraction-criteria.md
dead-code-criteria.md
style-criteria.md
tests-criteria.md
SKILL.md
prompt-improver/
SKILL.md
receive-feedback/
EVALUATION.md
references/
skill-integration.md
RESPONSE.md
SKILL.md
VERIFICATION.md
respond-pr-feedback/
SKILL.md
review-feedback-schema/
SKILL.md
review-llm-artifacts/
SKILL.md
review-plan/
SKILL.md
review-skill/
review-skill-improver/
SKILL.md
references/
design-checks.md
marketplace-checks.md
structural-checks.md
SKILL.md
review-structure/
SKILL.md
review-verification-protocol/
SKILL.md
skill-builder/
references/
skill-builder-guide.md
SKILL.md
subagent-prompt/
SKILL.md
verify-llm-artifacts/
references/
verification-checklist.md
SKILL.md
beagle-docs/
.claude-plugin/
plugin.json
README.md
skills/
docs-style/
references/
diataxis-compass.md
SKILL.md
draft-docs/
SKILL.md
ensure-docs/
references/
workflow.md
SKILL.md
explanation-docs/
SKILL.md
howto-docs/
SKILL.md
humanize-beagle/
references/
developer-voice.md
fix-strategies.md
vocabulary-swaps.md
SKILL.md
improve-doc/
SKILL.md
reference-docs/
SKILL.md
review-ai-writing/
references/
code-docs-patterns.md
communication-patterns.md
content-patterns.md
filler-patterns.md
formatting-patterns.md
vocabulary-patterns.md
SKILL.md
tutorial-docs/
references/
example-weather-api.md
SKILL.md
beagle-elixir/
.claude-plugin/
plugin.json
README.md
skills/
elixir-code-review/
references/
code-style.md
documentation.md
otp-basics.md
pattern-matching.md
SKILL.md
elixir-docs-review/
references/
doc-quality.md
spec-coverage.md
SKILL.md
elixir-performance-review/
references/
concurrency.md
ets-patterns.md
genserver-bottlenecks.md
memory.md
SKILL.md
elixir-security-review/
references/
atom-exhaustion.md
code-injection.md
process-exposure.md
SKILL.md
elixir-writing-docs/
references/
admonitions-and-formatting.md
cross-references.md
doctests.md
SKILL.md
exdoc-config/
references/
advanced-config.md
extras-formats.md
SKILL.md
exunit-code-review/
references/
exunit-patterns.md
integration-tests.md
mox-boundaries.md
test-adapters.md
SKILL.md
liveview-code-review/
references/
assigns-streams.md
components.md
lifecycle.md
security.md
SKILL.md
phoenix-code-review/
references/
contexts.md
controllers.md
plugs.md
routing.md
SKILL.md
review-elixir/
SKILL.md
review-verification-protocol/
SKILL.md
beagle-go/
.claude-plugin/
plugin.json
README.md
skills/
bubbletea-code-review/
references/
bubbles-components.md
composition.md
elm-architecture.md
model-update.md
view-styling.md
SKILL.md
go-architect/
references/
dependency-injection.md
graceful-shutdown.md
project-structure.md
SKILL.md
go-code-review/
references/
common-mistakes.md
concurrency.md
error-handling.md
interfaces.md
SKILL.md
go-concurrency-web/
references/
race-detection.md
rate-limiting.md
worker-pools.md
SKILL.md
go-data-persistence/
references/
connection-pooling.md
migrations.md
transactions.md
SKILL.md
go-middleware/
references/
context-propagation.md
error-handling-middleware.md
structured-logging.md
SKILL.md
go-testing-code-review/
references/
mocking.md
structure.md
SKILL.md
go-web-expert/
references/
testing-handlers.md
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