Penguin CLI

by Prism-Shadow

Penguin CLI is an AI Engineering skill for Claude Code, published by Prism-Shadow in penguin-harness.

1.5K stars150 forkson Prism-Shadow/penguin-harnessAdded 2026/08/19+21% in starsRepository updated 2026/08/19

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Install in seconds

Install Penguin CLI

Copy Penguin CLI into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/Prism-Shadow/penguin-harness/tree/main/packages/skills/skills/penguin-cli ~/.claude/skills/penguin-cli

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/Prism-Shadow/penguin-harness.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: packages/skills/skills/penguin-cli/SKILL.md in Prism-Shadow/penguin-harness
Installs to: ~/.claude/skills/penguin-cli
Collection: One of 21 skills cataloged from this repository
Category: AI Engineering — 2451 skills

What Penguin CLI does

Penguin CLI manages model API keys, default models, and per-agent vault secrets for the Penguin harness. Use it when configuring model credentials and agent secrets.

Penguin CLI is cataloged under AI Engineering on DirSkills. Penguin CLI comes from a repository tagged agent, agentic-ai, ai, build-tool and claude-code.

Documentation

README

Excerpt

Penguin CLI

The penguin CLI manages model credentials, default models and per-agent vault secrets. Its primary job is model configuration: penguin config model add registers a model and penguin config model list shows the models currently available. Configuration goes through the CLI only — never read or hand-edit the underlying hidden files.

Before you start

If the user's message only invokes this skill (e.g. "use penguin-cli skill") without a concrete request, ask the user what they want to configure. Do not run any command until the goal is clear.

This is the opening of the README. Read the full README on GitHub.

Frequently asked about Penguin CLI

What else does Prism-Shadow publish alongside Penguin CLI?
Penguin CLI is one of 21 skills that DirSkills catalogs from Prism-Shadow/penguin-harness, the repository it ships in. Its siblings there include Agent Creation, Agent Evaluation and Agent Optimization. Each one is a separate skill with its own page in this directory, installs the same way Penguin CLI does, and is maintained by Prism-Shadow in that same repository. The rest of the collection is listed on the Prism-Shadow/penguin-harness page.
How does Penguin CLI compare to other AI Engineering skills?
Penguin CLI ranks #993 by stars among the 2451 AI Engineering skills in this catalog. The most-starred ones next to it are Architecture Decision Records, AI-First Engineering and Agentic OS. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Penguin CLI against them. Open each page to compare what they document and how they install.