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Loop Engineering

CLI that scaffolds agent loops into a repo, scores their readiness and checks token cost

  • score 49
  • 11.6k stars
  • 88.2 stars/day since creation
  • pushed
  • v1.6.0 on
  • MIT

Scaffold a loop with npx

npx @cobusgreyling/loop init . --pattern daily-triage --tool claude
npx @cobusgreyling/loop doctor .
npx @cobusgreyling/loop cost --pattern daily-triage --level L1

Copied from the project's docs at github.com/cobusgreyling/loop-engineering

Why you'd want it

The unified npx CLI, @cobusgreyling/loop, has init, doctor, status, audit and cost commands. init scaffolds a chosen pattern such as daily-triage into a repo for Claude Code, Grok, Codex or opencode; the quickstart says it creates STATE.md, LOOP.md, loop-budget.md and loop-run-log.md and prints a Loop Ready score. The cost command checks the cost of a pattern at a given level and cadence before you schedule it. The repo also holds a library of patterns (Daily Triage, PR Babysitter, CI Sweeper and others) with docs on failure modes and safety.

Best for

  • Setting up a recurring agent loop in a repo
  • Scoring loop readiness before going unattended
  • Checking token cost before scheduling

Use it when

You want recurring agent work such as issue triage, CI or dependency upkeep set up as a defined loop, starting in report-only mode for the first week.

Skip it if

You want a one-off feature or refactor; the README calls this a pattern library, not a "rewrite the module" button. It scaffolds loops that run agents on a schedule, and the README warns that token costs can explode and unattended loops make unattended mistakes; it rates PR Babysitter cost High and CI Sweeper Very high. init writes files into your repo, and for Cursor, Windsurf and OpenClaw the quickstart says to copy the skills by hand.

Editor's note

Older per-tool packages (loop-init, loop-audit and others) stay supported, and companion repos are listed in the README. Grok and opencode are also supported by init but are not in the platform list.

Related tools

Same category or shared tags.

  1. Rank 1

    universal-modder

    Devtool

    Gives a coding agent skills, a CLI and a shared knowledge base for modding PC games you own

    • score 81
    • 8.3k stars
    • 168 stars/day last 3 days
    • pushed
    • MIT

    Install as a Claude Code plugin

    /plugin marketplace add rehan-remade/universal-modder
/plugin install universal-modder@universal-modder
    Use it when, skip it if, stats for universal-modder

    Why you'd want it

    universal-modder packages Agent Skills, three subagents and a Python CLI called um that a coding agent uses to mod a game: um scan finds Steam, Epic and Xbox installs and fingerprints the engine, loaders, anti-cheat and save folders, um backup snapshots saves, and um fal, um sprite and um render3d make and fit art, 3D and audio for the engine. The mod-any-game skill runs a fixed loop of recon, a backed-up lab, reading the real code, building one slice, testing it in the running game and writing a field note. Those field notes live in a knowledge base in the repo that agents search with um kb before starting and add to by pull request.

    Best for

    • Modding single-player PC games with an agent
    • Generating sprites and 3D assets for mods
    • Reusing other agents' modding notes

    Use it when

    You want Claude Code, Codex, Gemini CLI or another agent to work out how a game you own is built and ship a mod for it, with assets and an in-game test.

    Skip it if

    You play online games with anti-cheat: its own safety notes say injecting into an online client breaks the game's terms and gets accounts banned, and it refuses to do so. It touches game folders, saves, processes and your mouse and keyboard (asking first), asset generation needs a fal API key or a local ComfyUI server, and the repo is about two weeks old with no tagged release.

    Stats

    New and rising score
    81 of 100
    Stars per day, last 3 days
    168
    License
    MIT
    Pricing
    Open source
    Works with
    Claude Code, Codex, Gemini CLI, VS Code, Cursor, Windows
    Forks
    903
    Open issues
    11
    GitHub checked

    Full stat block for universal-modder

  2. Rank 2

    OpenFilm

    Devtool

    Lets a coding agent make videos as HTML pages, with a local browser editor to change anything it makes

    • score 76
    • 909 stars
    • 64.5 stars/day since creation
    • pushed
    • v0.2.0 on
    • MIT

    Add the OpenFilm skill to your agent

    npx skills add openfilm/openfilm
    Use it when, skip it if, stats for OpenFilm

    Why you'd want it

    OpenFilm has a coding agent such as Codex or Claude Code write a film as a folder with a film.html that cuts animated web pages, footage, pictures and sound together on tracks, styled with CSS. Each shot is a web page that draws any moment of itself with frame(t), and the same t must always draw the same picture. Studio, a local editor that runs in your browser, lets you move, scale and rotate elements, change text and color, and trim clips on the timeline, and the edits are saved to the film's files so the agent sees and keeps them. The look command checks the film by drawing each frame of its sheet twice and naming any that changed, along with page errors, failed fonts and missing sound files, and render writes the MP4.

    Best for

    • Agent-made launch videos with music
    • Hand-editing an agent's film in Studio
    • Exporting MP4, GIF or timelines for Premiere, Resolve and Final Cut

    Use it when

    You already work with Claude Code, Codex or another coding agent and want it to produce a video that you can then adjust by hand in an editor.

    Skip it if

    You want a polished, long-stable tool: the repo is about two weeks old and its releases are 0.x (latest v0.2.0). Setup needs Node 22.2+, ffmpeg and git, and the first run downloads about 100 MB of headless Chromium, though the desktop app bundles ffmpeg and the browser. Your agent runs openfilm commands and the pages render in a headless browser, and generated voice, music, images and video need your own provider keys entered in Studio, so review what the agent runs and where keys go.

    Stats

    New and rising score
    76 of 100
    Stars per day, since repo creation
    64.5
    Release
    v0.2.0,
    License
    MIT
    Pricing
    Open source
    Works with
    Claude Code, Codex, macOS, Linux, Windows
    Forks
    95
    Open issues
    7
    GitHub checked

    Full stat block for OpenFilm

  3. Rank 11

    Open Code Review

    Devtool

    Reviews Git diffs with a deterministic rule layer plus an LLM agent and writes line-level review comments

    • score 58
    • 47.6k stars
    • 90.2 stars/day last 3 days
    • pushed
    • v1.13.1 on
    • Apache-2.0

    Install with npm

    npm install -g @alibaba-group/open-code-review
    Use it when, skip it if, stats for Open Code Review

    Why you'd want it

    Open Code Review is a CLI that reads Git diffs and sends changed files to a configurable LLM through an agent that can read full files and search the codebase. Deterministic code, not the model, handles file selection, bundling of related files into sub-agent review units, and matching review rules to each file. Besides diff review, ocr scan reviews whole files, and delegation mode lets your own coding agent do the review so no OCR API key is needed. The docs list CI integrations for GitHub Actions, GitLab CI, GitFlic CI and Gerrit, and plugins for Claude Code, Codex, Cursor, Kimi Code and OpenCode.

    Best for

    • Reviewing pull requests in CI
    • Rule-driven review of large changesets
    • Giving a coding agent a review command

    Use it when

    You want a code review step that runs from the command line or CI and keeps file selection and rule matching in fixed code instead of in a prompt.

    Skip it if

    You need high recall; the README says its recall is lower than general-purpose agents, a deliberate trade-off for precision. It needs Git 2.41 or newer and, outside delegation mode, an LLM provider with an API key you enter, and it sends changed files to that endpoint. The README links an OpenTelemetry telemetry page, so read it before using the tool on private code. The repo is about five months old and ships releases every few days.

    Stats

    New and rising score
    58 of 100
    Stars per day, last 3 days
    90.2
    Release
    v1.13.1,
    License
    Apache-2.0
    Pricing
    Open source
    Works with
    Claude Code, Codex, Cursor, macOS, Linux, Windows
    Forks
    3,472
    Open issues
    323
    GitHub checked

    Full stat block for Open Code Review

For agents

The same entry, as files an agent can read without scraping this page. 

# read one entry
curl -s https://agenttooldrop.com/tools/loop-engineering.md

# list the MCP servers in the catalog
curl -s https://agenttooldrop.com/tools.json \
  | jq -r '.tools[] | select(.category=="mcp-server") | .slug'