Agent skills for the mechanics of agents themselves: how they are packaged, installed, kept from leaving stray processes behind, and how they design the tests that tell them whether their work holds.
A pinion is a bird's outer wing, the feathers that drive its flight, and also the small gear that drives a machine. These skills cover the agent's own working parts, not the task it is working on: turning a repository into installable plugins, waiting on long-running work without hanging or missing a crash, and designing tests, software or statistical, that can fail. Pinion is part of the Cracking Shells family of repositories, alongside Nest, the org's plugin marketplace.
| Skill | What it does |
|---|---|
designing-tests |
Designs tests before they are written, in both senses: software tests, each given a role (guard, confirm or probe) and a scope so the suite stays small and every test can fail; and statistical tests, designed with the experiment that feeds them, from hypotheses and test choice to sample size, a data contract and figures that show the result whether good or bad. |
spawning-agent-plugins |
Turns a repository's skills, MCP server or hooks into plugins that Claude Code, Codex and Agent Plugins 1.0 clients can install from GitHub, generated from one spec and checked for drift that no loader reports. |
waiting-on-processes |
Writes waits and watches in Claude Code that end by themselves and catch failures, for servers, builds, test runs, cluster jobs, CI checks and log lines, with a scheduled sweep that stops stray processes. |
spawning-agent-plugins is listed in the Nest marketplace; that entry still installs from cracking-shells-playbook, where the skill was first released, until Pinion publishes its own plugins.
To install a skill from this repository now, copy its directory into your skills folder:
git clone https://github.com/CrackingShells/Pinion.git
cp -R Pinion/skills/<skill-name> ~/.claude/skills/Copy into .claude/skills/ inside a repository instead to make the skill available in that project only. Restart Claude Code for the new skill to load.
spawning-agent-plugins moved here from cracking-shells-playbook with its history and release tags.
Questions and suggestions go to the issue tracker.
AGPL-3.0. See LICENSE.