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What you can do with Sepia

sepia is a portable Agent Skill that de-AI-fies writing, repairing narrative structure in fiction and applying venue-matched rules to professional documents.

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Nanako0129/sepia on GitHub

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What do you want to do?

5 use cases

  • Repair a story draft's narrative structure in Claude Code

    Diagnose and minimally fix AI tells in a story's architecture before touching word choice.

    View prompt
    Using the sepia repo, run its review operation on <chapter file path> and then its refactor operation with minimal edits. Expected output: a list of structural diagnoses followed by an edited copy of the file. Verify that no narrator states the theme outright and that the plot's causal chain is still intact.

  • Check release notes and PR replies against venue rules

    Review a professional draft against the rules for its document type before publishing.

    View prompt
    Using the sepia repo, run its review operation on <draft file path> as release notes. Expected output: a diagnosis that names each venue mismatch with its line. Verify that every number in the diagnosis matches the source notes.

  • Draft a blameless postmortem with the Codex plugin

    Write a postmortem that names mechanisms, timestamps, and owned action items.

    View prompt
    Using the sepia repo, run its write operation to draft a postmortem from <timeline notes file>. Expected output: a postmortem with timestamps, dead ends, and owned action items. Verify that every timestamp matches the timeline notes.

  • Rebuild a rough draft from its facts and intent

    Rewrite a flat draft from its source facts and stated purpose instead of editing it.

    View prompt
    Using the sepia repo, run its recreate operation on <facts and intent file>. Expected output: a full rewrite that keeps only the facts and intent from the source. Verify that every number and name in the rewrite appears in the source file.

  • Write or revise fiction with the Hemingway voice profile

    Apply the built-in Hemingway voice to a story with an opt-in direct entry.

    View prompt
    Using the sepia repo, run its hemingway operation on <scene file path>. Expected output: the scene with the Hemingway voice applied and a review of the profile's known costs. Verify that the story's facts and character names are unchanged.

How to use Sepia

  1. Check you have what it needs: An Agent Skills-compatible agent, or Claude Code or Codex for the native plugin packaging; The complete sepia plugin package installed, since the README says standalone wrapper installation is unsupported; A draft file or pasted text to review.
  2. Open Nanako0129/sepia on GitHub and read the README and license.
  3. Install the complete Sepia plugin package for Claude Code, not the bare skill file.
  4. Use the install route described under Install in the README to add the plugin. (inferred, check the README)
  5. Run /sepia-review on the chapter to get a diagnosis without any edits.
  6. Run /sepia-refactor on the same chapter to make minimal in-place edits.

These steps come from our top use case, Repair a story draft's narrative structure in Claude Code, which also has a copy-paste agent prompt.

Sepia alternatives · Best AI repos for Content

About this repo

  • Who it is forFiction writers, technical writers, and maintainers who draft release notes, PR replies, postmortems, or tickets with an AI agent and want the output to read less like AI.
  • Why it is hot
  • LanguagePython
  • Sourcegithub.com/Nanako0129/sepia · Back to Hot repos

Requirements

  • An Agent Skills-compatible agent, or Claude Code or Codex for the native plugin packaging
  • The complete sepia plugin package installed, since the README says standalone wrapper installation is unsupported
  • A draft file or pasted text to review
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Questions about Sepia

What is Sepia?

sepia is a portable Agent Skill that de-AI-fies writing, repairing narrative structure in fiction and applying venue-matched rules to professional documents. It is an open-source project on GitHub: https://github.com/Nanako0129/sepia.

Who is Sepia for?

Fiction writers, technical writers, and maintainers who draft release notes, PR replies, postmortems, or tickets with an AI agent and want the output to read less like AI.

What can I do with Sepia?

5 use cases so far, for example: Repair a story draft's narrative structure in Claude Code; Check release notes and PR replies against venue rules; Draft a blameless postmortem with the Codex plugin. Each has steps and a copy-paste agent prompt.

What do I need to run Sepia?

An Agent Skills-compatible agent, or Claude Code or Codex for the native plugin packaging; The complete sepia plugin package installed, since the README says standalone wrapper installation is unsupported; A draft file or pasted text to review.

What are alternatives to Sepia?

Other hot AI repos in Content: Voice Studio, Anatomy, Comfy UI, Hyperframes, Earshot.

Is Sepia safe to run?

Deduped does not own, audit or vouch for it. Read the README and license, run it on your own systems first and review every command before you run it.