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J Space

J Space is an agent skill (a SKILL.md file) from Tiger3807861189/J-Space-Cognition-Suite. Operate a selective workspace for complex reasoning, long tasks, repository engineering, coordinated agents, and authorized security analysis. It works with Claude Code and Codex and has 3,000 GitHub stars.

github.com/Tiger3807861189/J-Space-Cognition-Suite/j-space (opens in a new tab)

View on GitHub (opens in a new tab)

Add this skill

Claude

Claude Code loads skills from ~/.claude/skills/ (all projects) or .claude/skills/ (one project):

git clone --depth 1 https://github.com/Tiger3807861189/J-Space-Cognition-Suite.git
cp -r J-Space-Cognition-Suite/j-space ~/.claude/skills/j-space   # personal, or .claude/skills in a project

In the Claude apps, zip the j-space folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

ChatGPT / Codex

Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:

git clone --depth 1 https://github.com/Tiger3807861189/J-Space-Cognition-Suite.git
cp -r J-Space-Cognition-Suite/j-space .agents/skills/j-space   # repo; ~/.agents/skills for all projects

Standalone skills also load in the ChatGPT desktop app.

Cursor

Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:

git clone --depth 1 https://github.com/Tiger3807861189/J-Space-Cognition-Suite.git
cp -r J-Space-Cognition-Suite/j-space .cursor/skills/j-space   # project; ~/.cursor/skills for all projects

Source (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)

What this skill does

Operate a selective workspace for complex reasoning, long tasks, repository engineering, coordinated agents, and authorized security analysis. Use when work requires durable state, evidence, cross-file consistency, or recovery; keep direct answers lightweight. You make the workspace useful by binding what you hold to what you do, record, and check. Read this entry before routing. Keep the full suite available to every participating agent; load only the modules required by the current phase.

When it triggers

  • Use when work requires durable state, evidence, cross-file consistency, or recovery; keep direct answers lightweight.

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FAQ

J Space FAQ

Still curious? Email info@appsgit.com.

What is the J Space skill?

J Space is an agent skill (a SKILL.md file) from Tiger3807861189/J-Space-Cognition-Suite. Operate a selective workspace for complex reasoning, long tasks, repository engineering, coordinated agents, and authorized security analysis. It works with Claude Code and Codex and has 3,000 GitHub stars. Its SKILL.md lives at github.com/Tiger3807861189/J-Space-Cognition-Suite/j-space.

How do I install the J Space skill?

Copy the j-space folder (the one containing SKILL.md) into ~/.claude/skills/ for Claude Code, .agents/skills/ for Codex or .cursor/skills/ for Cursor. The agent picks it up automatically when a task matches its description.

Is the J Space skill free?

Yes. The repository is open source under the Apache-2.0 license.

Is J Space maintained?

The repository's most recent commit was on Sep 14, 2026. Its latest release is sv1. appsgit only lists skills from repositories with a commit in the last six months.