Sepia (de-AI writing)
Writing skill that removes the tells of AI-written text: fixes story structure in fiction and applies fitting rules for release notes, PR replies and other work writing.
Test results
Run with our skill harness: the skill alone in a throwaway project, invoked by name, and the real output file checked. Skills are tested in Claude Code and Cursor only so far.
| Client | Result | Last passed | What we checked |
|---|---|---|---|
| Claude Code 2.1.296 (Claude Code) | Passed Tested 2026-10-26 | 2026-10-26 | facts missing=[]; AI tells left=[]; text='Version 4.2 ships on March 3, 2027, cuts load time by 40 percent, and fixes ticket TP-B7F595.\n' |
| Cursor 2026.10.22-27dcf5f | Passed Tested 2026-10-26 | 2026-10-26 | facts missing=[]; AI tells left=[]; text='Version 4.2 ships on March 3, 2027, cuts load time by 40 percent, and fixes ticket TP-FD4A0C.\n' |
Skill version: github.com/Nanako0129/sepia @ fb06be76 (2026-10-15).
Get it
The skill’s files and install instructions are in its repository: github.com/Nanako0129/sepia.