Code Harness

Code Harness is a Quality skill for Claude Code, published by jeremylongshore in claude-code-plugins-plus-skills.

2.6K stars384 forkson jeremylongshore/claude-code-plugins-plus-skillsAdded 2026/08/12Repository updated 2026/08/12

agent-skillsaiai-agentsanthropicautomationclaude-codeclaude-code-pluginsdeveloper-toolsdevopsllmmarketplacemcpplugin-marketplaceplugin-systemsaasskills

Install in seconds

Install Code Harness

Copy Code Harness 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/jeremylongshore/claude-code-plugins-plus-skills/tree/main/plugins/community/ejentum-code ~/.claude/skills/ejentum-code

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/jeremylongshore/claude-code-plugins-plus-skills.git

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

In this catalog

Source file: plugins/community/ejentum-code/SKILL.md in jeremylongshore/claude-code-plugins-plus-skills
Installs to: ~/.claude/skills/ejentum-code
Collection: One of 53 skills cataloged from this repository
Category: Quality — 1354 skills

What Code Harness does

Code Harness calls an engineering scaffold before generating, refactoring, reviewing, or debugging code. Use it to catch broken assumptions, behavior changes, and contract violations when working on implementations or architecture.

Code Harness is cataloged under Quality on DirSkills. Code Harness comes from a repository tagged agent-skills, ai, ai-agents, anthropic and automation.

Documentation

README

Excerpt

Code Harness

When this skill triggers, call the code tool from the ejentum MCP server. Pass a 1-2 sentence framing of WHAT you are coding or reviewing as the query argument. Include the failure risk to avoid where possible.

Good query: review a Python refactor that converts raise UserNotFound to silent default return; tests still pass Bad query: look at this code

The tool returns a structured scaffold containing:

[CODE FAILURE]: engineering failure pattern to avoid
[ENGINEERING PROCEDURE]: steps to follow
[REASONING TOPOLOGY]: decision flow
[CORRECT PATTERN]: shape correct code should take
[VERIFICATION]: self-check
Amplify: and Suppress: signals

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

Frequently asked about Code Harness

What else does jeremylongshore publish alongside Code Harness?
Code Harness is one of 53 skills that DirSkills catalogs from jeremylongshore/claude-code-plugins-plus-skills, the repository it ships in. Its siblings there include Agency OS, Anti-Deception and Audit. Each one is a separate skill with its own page in this directory, installs the same way Code Harness does, and is maintained by jeremylongshore in that same repository. The rest of the collection is listed on the jeremylongshore/claude-code-plugins-plus-skills page.
How does Code Harness compare to other Quality skills?
Code Harness ranks #494 by stars among the 1354 Quality skills in this catalog. The most-starred ones next to it are Benchmark, Benchmark Optimization Loop and API Design Patterns. 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 Code Harness against them. Open each page to compare what they document and how they install.