MushyBook
skills logo

skills

Codebase harness + loop engineer

Agent HarnessAI AgentsAgent SkillsClaudeClaude CodeDeveloper ToolsLoop EngineeringPython 1.0k 140Health 75
Website GitHub

What is it?

What it is

A Claude Code **plugin marketplace** of the skills we share at for building **loop engineers**: agents that get triggered on their own, pick up work, ship it,

Why it exists

Codebase harness + loop engineer

Who should use it

Teams building with Python who want an open-source, self-hosted option.

Who should avoid it

Teams that need a fully managed SaaS with enterprise SLAs out of the box.

How it works

A quick walkthrough in plain English

How skills works

Step 1 of 3

You interact with it

Open skills, send a request, or connect it to your stack.

Features

Agent Harness
Agent Skills
Ai Agents
Claude
Claude Code
Developer Tools

Advantages

  • Open source (Open Source)
  • Active Python ecosystem
  • Self-hosted deployment options

Disadvantages

  • Requires operational ownership for self-hosted setups
  • Community support varies by project maturity

Installation

native

One plugin, all the skills below.

## The two entry points

### `/setup-codebase-harness` — make a code repo agent-ready
Run it in the code repo your agents work in, so they can run, test, and verify their own work.
It orchestrates the harness skills below — pull in only what the repo needs.

### `/new-loop` — build your shared brain
Run it where your agent's memory should live. First run **bootstraps the knowledge base**
(creates `ARCHITECTURE.md`, `LOG.md`, the `signals/ docs/ domains/` folders, and a knowledge-base
section in your `CLAUDE.md`); then it scaffolds the loop, does one real test run, and logs it.
Run it again any time to add another loop.

## The skills (when to use which)

**Codebase harness** — make a repo agent-ready

| Skill | Use it when… |
|---|---|
| **`setup-codebase

FAQ

What is skills?

skills is an open-source project licensed under Open Source.

What language is skills built with?

Primary language: Python.

Is it free to use?

Yes. Licensed under Open Source. Check the license for commercial use.

Loading documentation…
View on GitHub

Featured in Videos

YouTube tutorials and walkthroughs for skills

Alternatives

Similar projects ranked by category, topics, and text overlap.

Compare
ponytail logo

ponytail

JavaScript

Ponytail injects a rule‑set into AI agent sessions that checks each proposed change against a ladder: need, reuse, stdlib, native feature, dependency, one‑line, then minimum viable code. Benchmarks show ~54% less code, ~20% lower cost, ~27% faster execution, and 100% safety compared to a no‑skill baseline. Installation is a single marketplace add for Claude Code, Codex, Copilot CLI, OpenCode, Gemini/Antigravity, Hermes, CodeWhale, Swival, Devin, and OpenClaw.

80.9k·Health 95

Compare
loop-engineering logo

loop-engineering

JavaScript

Practical patterns, starters & CLI tools for loop engineering with AI coding agents. Design systems that prompt and orchestrate agents (inspired by Addy Osmani and Boris Cherny). Includes loop-audit, loop-init, loop-cost.

8.5k·Health 90

Compare
ECC logo

ECC

JavaScript

The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.

234.6k·Health 95

Compare
portaljs logo

portaljs

TypeScript

PortalJS offers an AI‑powered workflow: a Claude Code skill set that first advises on the appropriate infrastructure (git + R2 + Parquet + DuckDB by default, with optional CKAN or other backends), then scaffolds a Next.js application with three surfaces (Home, Catalog, Showcase). The surfaces consume data through a single DataProvider, allowing the underlying backend to change without touching the UI. The framework ships with a suite of skills for adding datasets, resources, charts, maps, and metadata, as well as for deploying to Cloudflare‑based hosting. All code is MIT‑licensed and fully open, enabling teams to own and extend their portals.

2.3k·Health 85

Compare
loop-library logo

loop-library

JavaScript

The repository hosts a live website where anyone can browse and copy loops, and a Loopy skill that agents can install to interact with the catalog—discovering repeated work, auditing loops, running them with evidence, and publishing new loops after approval.

2.8k·Health 90

Compare
skills | MushyBook