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sepia ships a de-AI writing skill targeting four different coding harnesses at once
Nanako0129/sepia appeared 2026-08-28 and reached 814 stars in two days. It is a de-AI writing skill packaged for Claude Code, Codex, Grok Build and Antigravity, framed as narrative-architecture repair rather than word-level substitution, aimed at fiction and long-form prose. Two things are notable for builders: the anti-slop skill category is now large enough to sustain multiple competing implementations, and the cross-harness packaging suggests skill authors have stopped treating Claude Code as the only target.
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