Penguin SDK

by Prism-Shadow

Penguin SDK 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 SDK

Copy Penguin SDK 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-sdk ~/.claude/skills/penguin-sdk

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

What Penguin SDK does

Penguin SDK is a TypeScript SDK for building self-contained AI apps with agents, sessions, and streaming thinking/tool messages. It includes a complete RAG recipe that ingests documents into a knowledge base and answers with citations behind a web UI.

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

Documentation

README

Excerpt

Penguin Harness SDK

@prismshadow/penguin-core is the TypeScript SDK this agent itself runs on. Use it to build your own AI apps:

An Agent loads its state (prompts, tools, skills) from <root>/<project_id>/agents/<agent_id>/. Creating an Agent whose directory is empty initializes it with defaults.
A Session is one conversation of an Agent inside a Workspace directory.
session.run() executes one task and streams every step (thinking, text, tool calls) as OmniMessages.

To have an agent perform a task, use the run_subagent tool — the SDK is for building applications, not for invoking agents.

Before you start

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

Frequently asked about Penguin SDK

What else does Prism-Shadow publish alongside Penguin SDK?
Penguin SDK 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 SDK 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 SDK compare to other AI Engineering skills?
Penguin SDK ranks #994 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 SDK against them. Open each page to compare what they document and how they install.