Sepia
An agent skill that takes the AI tone out of writing, for Claude Code, Codex and more
About Sepia
Sepia is a de-AI writing skill for any Agent Skills-compatible agent, with native plugins for Claude Code, Codex, Grok Build and Antigravity. It applies rules matched to where the text is going for professional prose, and narrative repair for fiction.
It is based on the StoryScope paper (arXiv:2604.03136). Useful for anything you publish under your own name: docs, launch posts, newsletters.
Install in Claude Code: /plugin marketplace add Nanako0129/sepia
MIT licensed. View on GitHub.
The facts
- Type
- Github
- Tags
- AIContent
- Listed
- September 21, 2026
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