whereismyai
Sepia
Sepia is an Agent Skill that repairs narrative architecture and prose to remove AI writing patterns.
Sepia is a portable Agent Skill designed to detect and repair AI-generated writing tells at the structural level. Instead of editing mere word choice and syntax, it addresses narrative architecture in fiction and applies venue-matched rules to professional documents like release notes, PR replies, postmortems, tickets, and technical articles. The tool executes a three-pass protocol covering narrative architecture, discourse flow, and surface style. It supports multiple operations including write, review, refactor, recreate, and hemingway. The skill installs via the Skills CLI and includes native plugins for Claude Code, Codex, Grok Build, Antigravity, and QwenPaw.
Sepia at a glance
- Best for: Writer, Marketer
- Runs on: CLI, open source
- Pricing: Free
- Released: August 2026
- Category: AI writing tool
- Website: github.com/Nanako0129/sepia
Key features
- Repairs narrative architecture in fiction
- Matches professional documents to specific venue rules
- Performs three-pass writing and revision protocols
- Provides write, review, refactor, and recreate operations
- Supports stacking voice and style skills
- Installs via the Skills CLI with one command
Use it for
- Eliminate structural AI tells from fiction and stories
- Draft and revise professional release notes and postmortems
- Clean up AI-generated PR replies and support tickets
- Apply specialized voice profiles like Hemingway or journalism styles
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