Skill Creator
This is the meta-skill for building skills themselves. It teaches you how to structure modular extensions for Codex, balancing specificity with context efficiency. The core insight is treating the context window as shared resource: keep metadata lean (name and description trigger the skill), put workflows in SKILL.md (under 500 lines), and split heavy documentation into reference files that load on demand. It pushes you toward scripts for repetitive tasks and high specificity for fragile operations, but looser instructions when multiple approaches work. If you're creating skills or wondering why yours aren't triggering correctly, this explains the three-tier loading system and what belongs where.
- skills.sh installs
- 1.1K
- GitHub stars
- 476
- last updated
- Aug 21, 2026
Install
$ npx -y skills add aiskillstore/marketplace --skill skill-creator --agent claude-codeInstalls into .claude/skills of the current project.
Files
Skill Creator
Create skills that give Codex useful, non-obvious guidance without constraining unrelated work.
Core Principles
Assume Codex is already capable. Include only information that changes its decisions or improves its work. Remove generic advice, repeated instructions, speculative edge cases, and examples that do not materially clarify the task.
Preserve user intent and scope. A skill should support the requested task, not replace the user's chosen product, expand the assignment, modify unrelated configuration, or imply permission for additional external actions. Do not turn a particular example, past failure, or personal preference into a universal requirement.
Approval to complete a task does not expand its scope or execution permissions. For retrying or externally mutating workflows, define a stopping condition proportional to the risk.
Match specificity to the risk. Give the model room to choose an appropriate approach when multiple approaches are reasonable. Use detailed steps, deterministic scripts, or absolute language only when correctness, safety, permissions, or a genuinely fragile workflow requires them.
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- Repository
- github.com/aiskillstore/marketplace
- Categories
- Documentation, Skill Development
- First seen
- May 16, 2026
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