# Sepia (agent skill)

> Sepia is an agent skill (a SKILL.md file) from Nanako0129/sepia. Make AI-generated writing read as human-written, in fiction and in professional prose. It works with Claude Code, Codex, Cursor, GitHub Copilot and OpenCode and has 3,004 GitHub stars across a repository of 2 listed skills.

Make AI-generated writing read as human-written, in fiction and in professional prose. Repairs the narrative architecture of fiction and stories (based on StoryScope, arXiv:2604.03136); routes professional text through domain rules for release notes, announcements, PR and issue replies, code-review comments, incident postmortems, tickets, work orders, technical articles, blog posts, and long-form journalism.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/Nanako0129/sepia |
| Skill path | skills/sepia/SKILL.md |
| Skill name | sepia |
| GitHub stars | 3,004 |
| Installs on skills.sh | 4 |
| License | MIT |
| Skills in repo | 2 |
| Plugin marketplace | sepia |
| Official | no |
| Works with | Claude Code, Codex, Cursor, GitHub Copilot, OpenCode |
| Category | Docs & writing |
| Last commit | Oct 6, 2026 |

## When it triggers

- Use when asked to humanize, de-AI, unslop, or strip AI flavor from any text; when writing or revising any of these document types; or whenever output must not read as machine-written.

## Add this skill

### Claude Code

```sh
/plugin marketplace add Nanako0129/sepia
/plugin install sepia@sepia
```

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

### ChatGPT / Codex

```sh
git clone --depth 1 https://github.com/Nanako0129/sepia.git
cp -r sepia/skills/sepia .agents/skills/sepia   # repo; ~/.agents/skills for all projects
```

### Cursor

```sh
git clone --depth 1 https://github.com/Nanako0129/sepia.git
cp -r sepia/skills/sepia .cursor/skills/sepia   # project; ~/.cursor/skills for all projects
```

Sources (checked 2026-10-07): https://code.claude.com/docs/en/skills, https://support.claude.com/en/articles/12512180-using-skills-in-claude, https://learn.chatgpt.com/docs/build-skills, https://cursor.com/docs/context/skills

skills.sh listing: https://www.skills.sh/Nanako0129/sepia/sepia

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