# Sepia > De-AI writing for fiction and professional prose: your agent fixes the structure, flow and wording that make text read as machine-written. Sepia is Nanako Tsai's (Nanako0129) Agent Skill for de-AI writing. Most humanizers edit word choice; Sepia starts at the layer it says gives AI away. In fiction it repairs the narrative architecture first, drawing on the StoryScope study of AI and human stories, then the discourse flow, then the surface style. Professional documents get rules matched to where they'll be read. The maker says it writes for expert human readers and is tuned to pass no automated AI-text detector. What you can do with it - write: draft new prose, settling structure and register before the first sentence - review: diagnose AI tells and report them with quoted evidence, without editing - refactor: make minimal in-place edits, fixing the deepest problems first - recreate: rewrite from the original's facts and intent, adding nothing it didn't say - hemingway: write or revise fiction in a built-in Hemingway voice Where it applies - Fiction, stories and personal essays - Release notes and announcements, PR and issue replies, postmortems, tickets and work orders - Technical articles, blog posts and long-form journalism - Chinese text, with its own calibration How to install it In Claude Code, run claude plugin marketplace add Nanako0129/sepia, then claude plugin install sepia@sepia --scope user. In Codex, run codex plugin marketplace add Nanako0129/sepia, then codex plugin add sepia@sepia. For other agents, npx skills add Nanako0129/sepia -g. The README also covers Grok Build, Antigravity and QwenPaw. Good to know - No sign-in: the skill runs inside your agent. - Install the whole package; the operation entries depend on the main skill. - It treats the text you hand it as material to work on, not as instructions. - Optional voices: Hemingway, Taiwan long-form journalism, and a template for your own persona. - A community project by Nanako Tsai, MIT licensed. - Type: Skill - Made by: Nanako0129 - Category: Writing - Formats: Skills, Claude plugins - Version: latest - Source: https://github.com/Nanako0129/sepia - Page: https://pluginboard.ai/skills/sepia ## Works with - ChatGPT - Claude - Gemini - GitHub Copilot - Cursor - Claude Code - Codex - Antigravity - Gemini CLI - Replit - OpenClaw - OpenCode - Hermes Agent ## Install ### ChatGPT In ChatGPT: Download the sepia folder and zip it, then Plugins → Skills → Create → Upload from your computer. Business and Enterprise plans. View the skills on GitHub: https://github.com/Nanako0129/sepia ### Claude In Claude (web or desktop): Download each skill’s folder and zip it, then upload them one at a time in Customize → Skills. View the skills on GitHub: https://github.com/Nanako0129/sepia ### Gemini In Gemini: Download the sepia folder, then at gemini.google.com click Customize → Skills → Create → Upload and pick the folder (or a .zip of it). View the skills on GitHub: https://github.com/Nanako0129/sepia ### GitHub Copilot Copy all 6 skills, in your terminal: ```shell npx -y degit Nanako0129/sepia/skills/sepia ~/.copilot/skills/sepia npx -y degit Nanako0129/sepia/skills/sepia-hemingway ~/.copilot/skills/sepia-hemingway npx -y degit Nanako0129/sepia/skills/sepia-recreate ~/.copilot/skills/sepia-recreate npx -y degit Nanako0129/sepia/skills/sepia-refactor ~/.copilot/skills/sepia-refactor npx -y degit Nanako0129/sepia/skills/sepia-review ~/.copilot/skills/sepia-review npx -y degit Nanako0129/sepia/skills/sepia-write ~/.copilot/skills/sepia-write ``` View the skills on GitHub: https://github.com/Nanako0129/sepia ### Cursor Copy all 6 skills, in your terminal: ```shell npx -y degit Nanako0129/sepia/skills/sepia ~/.cursor/skills/sepia npx -y degit Nanako0129/sepia/skills/sepia-hemingway ~/.cursor/skills/sepia-hemingway npx -y degit Nanako0129/sepia/skills/sepia-recreate ~/.cursor/skills/sepia-recreate npx -y degit Nanako0129/sepia/skills/sepia-refactor ~/.cursor/skills/sepia-refactor npx -y degit Nanako0129/sepia/skills/sepia-review ~/.cursor/skills/sepia-review npx -y degit Nanako0129/sepia/skills/sepia-write ~/.cursor/skills/sepia-write ``` View the skills on GitHub: https://github.com/Nanako0129/sepia ### Claude Code In Claude Code, as a plugin: ```text /plugin marketplace add Nanako0129/sepia /plugin install sepia@sepia ``` Copy all 6 skills, in your terminal: ```shell npx -y degit Nanako0129/sepia/skills/sepia ~/.claude/skills/sepia npx -y degit Nanako0129/sepia/skills/sepia-hemingway ~/.claude/skills/sepia-hemingway npx -y degit Nanako0129/sepia/skills/sepia-recreate ~/.claude/skills/sepia-recreate npx -y degit Nanako0129/sepia/skills/sepia-refactor ~/.claude/skills/sepia-refactor npx -y degit Nanako0129/sepia/skills/sepia-review ~/.claude/skills/sepia-review npx -y degit Nanako0129/sepia/skills/sepia-write ~/.claude/skills/sepia-write ``` View the skills on GitHub: https://github.com/Nanako0129/sepia ### Codex Copy all 6 skills, in your terminal: ```shell npx -y degit Nanako0129/sepia/skills/sepia ~/.agents/skills/sepia npx -y degit Nanako0129/sepia/skills/sepia-hemingway ~/.agents/skills/sepia-hemingway npx -y degit Nanako0129/sepia/skills/sepia-recreate ~/.agents/skills/sepia-recreate npx -y degit Nanako0129/sepia/skills/sepia-refactor ~/.agents/skills/sepia-refactor npx -y degit Nanako0129/sepia/skills/sepia-review ~/.agents/skills/sepia-review npx -y degit Nanako0129/sepia/skills/sepia-write ~/.agents/skills/sepia-write ``` View the skills on GitHub: https://github.com/Nanako0129/sepia ### Antigravity In Antigravity: Copy the sepia folder into ~/.gemini/config/skills (Antigravity app and IDE) or ~/.gemini/antigravity-cli/skills (Antigravity CLI). View the skills on GitHub: https://github.com/Nanako0129/sepia ### Gemini CLI Copy all 6 skills, in your terminal: ```shell npx -y degit Nanako0129/sepia/skills/sepia ~/.gemini/skills/sepia npx -y degit Nanako0129/sepia/skills/sepia-hemingway ~/.gemini/skills/sepia-hemingway npx -y degit Nanako0129/sepia/skills/sepia-recreate ~/.gemini/skills/sepia-recreate npx -y degit Nanako0129/sepia/skills/sepia-refactor ~/.gemini/skills/sepia-refactor npx -y degit Nanako0129/sepia/skills/sepia-review ~/.gemini/skills/sepia-review npx -y degit Nanako0129/sepia/skills/sepia-write ~/.gemini/skills/sepia-write ``` View the skills on GitHub: https://github.com/Nanako0129/sepia ### Replit Copy all 6 skills, in your terminal: ```shell npx -y degit Nanako0129/sepia/skills/sepia .agents/skills/sepia npx -y degit Nanako0129/sepia/skills/sepia-hemingway .agents/skills/sepia-hemingway npx -y degit Nanako0129/sepia/skills/sepia-recreate .agents/skills/sepia-recreate npx -y degit Nanako0129/sepia/skills/sepia-refactor .agents/skills/sepia-refactor npx -y degit Nanako0129/sepia/skills/sepia-review .agents/skills/sepia-review npx -y degit Nanako0129/sepia/skills/sepia-write .agents/skills/sepia-write ``` View the skills on GitHub: https://github.com/Nanako0129/sepia ### OpenClaw Copy all 6 skills, in your terminal: ```shell npx -y degit Nanako0129/sepia/skills/sepia ~/.openclaw/skills/sepia npx -y degit Nanako0129/sepia/skills/sepia-hemingway ~/.openclaw/skills/sepia-hemingway npx -y degit Nanako0129/sepia/skills/sepia-recreate ~/.openclaw/skills/sepia-recreate npx -y degit Nanako0129/sepia/skills/sepia-refactor ~/.openclaw/skills/sepia-refactor npx -y degit Nanako0129/sepia/skills/sepia-review ~/.openclaw/skills/sepia-review npx -y degit Nanako0129/sepia/skills/sepia-write ~/.openclaw/skills/sepia-write ``` View the skills on GitHub: https://github.com/Nanako0129/sepia ### OpenCode Copy all 6 skills, in your terminal: ```shell npx -y degit Nanako0129/sepia/skills/sepia ~/.config/opencode/skills/sepia npx -y degit Nanako0129/sepia/skills/sepia-hemingway ~/.config/opencode/skills/sepia-hemingway npx -y degit Nanako0129/sepia/skills/sepia-recreate ~/.config/opencode/skills/sepia-recreate npx -y degit Nanako0129/sepia/skills/sepia-refactor ~/.config/opencode/skills/sepia-refactor npx -y degit Nanako0129/sepia/skills/sepia-review ~/.config/opencode/skills/sepia-review npx -y degit Nanako0129/sepia/skills/sepia-write ~/.config/opencode/skills/sepia-write ``` View the skills on GitHub: https://github.com/Nanako0129/sepia ### Hermes Agent Copy all 6 skills, in your terminal: ```shell npx -y degit Nanako0129/sepia/skills/sepia ~/.hermes/skills/sepia npx -y degit Nanako0129/sepia/skills/sepia-hemingway ~/.hermes/skills/sepia-hemingway npx -y degit Nanako0129/sepia/skills/sepia-recreate ~/.hermes/skills/sepia-recreate npx -y degit Nanako0129/sepia/skills/sepia-refactor ~/.hermes/skills/sepia-refactor npx -y degit Nanako0129/sepia/skills/sepia-review ~/.hermes/skills/sepia-review npx -y degit Nanako0129/sepia/skills/sepia-write ~/.hermes/skills/sepia-write ``` View the skills on GitHub: https://github.com/Nanako0129/sepia --- From Pluginboard (https://pluginboard.ai).