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Nanako0129/sepia

A portable Agent Skill that removes AI-writing tells from prose, repairing narrative structure in fiction and applying venue-specific rules to professional documents.

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What is it?

sepia is a de-AI writing skill for agents that support the Agent Skills standard. It targets the structural features that make AI-generated fiction recognizable, such as explained themes, tidy single-track plots, and resolved endings, and repairs them before adjusting word choice. For professional documents like release notes, PR replies, postmortems, tickets, and technical articles, it applies a shared checklist plus a thin rule file for each document type.

The skill offers four operations: write, review (diagnose only), refactor (minimal edits), and recreate (full rewrite). Claude Code, Codex, Grok Build, Antigravity, and QwenPaw get native plugin packaging with direct commands, while the Skills CLI installs it on other supported agents. Chinese text loads a separate calibration reference covering Chinese corpora and Taiwan writing conventions.

The project also includes an experimental interface for stacking voice or style skills on top of sepia, along with built-in Hemingway and Taiwan long-form journalism profiles. Its rules are grounded in cited studies collected under the research directory.

Key features

  • 01Repairs narrative architecture in fiction before word-level edits
  • 02Provides venue-specific rules for release notes, PR replies, postmortems, tickets, and technical articles
  • 03Offers write, review, refactor, and recreate operations
  • 04Installs via the Skills CLI on 77+ agents or as native plugins for five platforms
  • 05Includes Chinese-specific calibration for sentence rhythm and conventions

Use cases

  • Revising a draft of short fiction so it reads less like AI output
  • Reviewing a technical postmortem or release note for generic AI phrasing
  • Cleaning up PR replies and tickets before publishing them to a team
  • Adding a de-AI review step to a Claude Code or Codex workflow

Quick start

  1. 1

    Install for any agent via Skills CLI (user scope)

    npx skills add Nanako0129/sepia -g
  2. 2

    Update sepia later

    npx skills update sepia -g

Things to know

  • The README describes it as a skill for agents, not a standalone program, so it needs an agent host to run.
  • Standalone wrapper installation is unsupported; install the complete plugin package.
  • The voice-skills interface rests on a single blind review experiment, described by the author as a worked example rather than measured evidence.

Topics

#agent-skills#ai-writing#prompt-engineering#writing-tools#fiction#llm#antigravity#claude-code#codex#developer-tools

FAQ

What is sepia?
A portable Agent Skill that removes AI-writing tells from prose, repairing narrative structure in fiction and applying venue-specific rules to professional documents. sepia is a de-AI writing skill for agents that support the Agent Skills standard. It targets the structural features that make AI-generated fiction recognizable, such as explained themes, tidy single-track plots, and resolved endings, and repairs them before adjusting word choice. For professional documents like release notes, PR replies, postmortems, tickets, and technical articles, it applies a shared checklist plus a thin rule file for each document type.
Is sepia free to use? What license does it have?
sepia is open source under the MIT license. Check the license terms before using it in commercial products.
Is sepia still maintained?
Actively maintained. The last commit to sepia was on Oct 15, 2026.
What can I use sepia for?
Revising a draft of short fiction so it reads less like AI output Reviewing a technical postmortem or release note for generic AI phrasing Cleaning up PR replies and tickets before publishing them to a team Adding a de-AI review step to a Claude Code or Codex workflow
How do I install sepia?
Install for any agent via Skills CLI (user scope): npx skills add Nanako0129/sepia -g Update sepia later: npx skills update sepia -g
Where can I get sepia?
The source code and installation instructions are on GitHub: https://github.com/Nanako0129/sepia

Summary generated by AI from the project's README. GitHub stats refresh daily.

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