rk-skills: An Open-Source Library of Fable Loop Skills for Claude Code

A developer who has been coding with AI since Sonnet 3 open-sourced his full library of custom loop skills built for Fable 5, and this video walks through the highlights. The library is called rk-skills. It packages autonomous workflows, called loops, that take a task from a GitHub issue all the way to a reviewed PR without a human in between. The creator counts roughly 18 skills in the repo and says they work in Claude Code, Cursor, and Codex.

The pitch is simple: instead of prompting Claude Code step by step, you install a skill that chains the steps for you. File an issue, validate it, plan it with a Fable 5 subagent, build it, and push it through PR review, all from one command.

Creator introducing the video with the on-screen title "Super Claude Code Loop Skills"

The Loop Skills

The video screen-records the actual SKILL.md files on GitHub. The first one shown is fable-new-issue-loop. Its doc reads: "Chain fable-new-issue → validate-issue-loop into one auto[mated] loop [that] drives it to a reviewed PR without a human in between." The skill file itself is small, 52 lines at 4.3 KB, and it enforces discipline up front: "Do not skip filing a complete issue," because every downstream step depends on a fully specified issue rather than jumping straight into the PR.

GitHub view of the fable-new-issue-loop SKILL.md showing the chain from issue creation to reviewed PR

Next is fable-validate-loop. Per its doc, it chains fable-validate into a conditional issue update, then implements the plan and drives the PR through review. The doc warns "Do not skip or reorder the chain" because validation gates the plan, and every other step of each skill still runs. The creator describes it as using Fable to validate the GitHub issue, then building the whole thing using fableplan and Opus.

The fable-validate-loop skill documentation describing the validate, update, implement, review chain

Planning with a Fable 5 Subagent

The third skill highlighted is fableplan. Its description: delegate planning to a Fable 5 Plan subagent, then build from its plan in the main agent. The subagent produces an implementation plan, relays it back, and if a GitHub issue is referenced, posts the plan as a comment on that issue. It triggers on phrases like "with fable" or "fableplan adding X to Y", and accepts a task in prose or a GitHub issue reference as input.

The fableplan skill page showing it delegates planning to a Fable 5 Plan subagent

The Full Library and Install

A quick scroll through the repo's skills folder shows the breadth: create-release, fable-new-issue-loop, fable-new-issue, fable-validate-loop, fable-validate, fableplan, fix-pr-review-loop, fix-pr-review, new-issue-loop, new-issue, sync-docs-release, sync-docs, and validate variants. Many skills come in paired form, a single-shot version and a loop version that runs the chain end to end.

Repo folder listing showing the skill directories including fix-pr-review-loop, new-issue-loop, and sync-docs

Installation is one command, shown on screen as an overlay:

npx rk-skills

Everything is open source, and the creator says the repo link is in his bio.

Key Takeaways

rk-skills is an open-source library of about 18 Claude Code skills built around Fable 5, with loop variants that chain issue creation, validation, planning, building, and PR review into one autonomous run.
The loops are strict by design: file a complete issue first and never skip or reorder the chain, because each step gates the next.
fableplan delegates planning to a Fable 5 Plan subagent, then the main agent builds from that plan, posting the plan to the referenced GitHub issue.
Install is a single command, npx rk-skills, and the skills also work in Cursor and Codex.

Resources

rk-skills repo (shown on GitHub in the video; link in @rich_kuo1's bio), installable via npx rk-skills