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epub-translate

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Translate EPUB (.epub) ebooks to another language by unpacking the EPUB container, extracting XHTML block-level fragments into JSONL translation units, translating them via the OpenAI Responses API (e.g. gpt-5.1 / gpt-5-mini) while preserving markup, updating language metadata, and repackaging a valid EPUB (mimetype-first and uncompressed). Use when Codex needs to translate and rebuild EPUB files.

epub-translate/SKILL.md

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Nov 11, 2026

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11
Repository last updated
Feb 15, 2026
License
MIT

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# EPUB Translate

## Workflow
1. One-time setup (writes `.skills-data/epub-translate/.env`): `scripts/epub-translate setup`
2. Extract translation units: `scripts/epub-translate extract --epub /path/book.epub`
3. Translate via OpenAI API: `scripts/epub-translate translate --job-dir <job-dir> --target-lang <bcp47> [--fraction 0.1]`
4. Apply + repack: `scripts/epub-translate apply --job-dir <job-dir> --translations <job-dir>/translations.jsonl --target-lang <bcp47> --out-epub /path/book.<bcp47>.epub`
5. Optional: validate output: `scripts/epub-translate validate --epub /path/book.<bcp47>.epub`

## Commands
- `scripts/epub-translate setup`:
  - Prompts for `OPENAI_API_KEY` (saved to `.skills-data/epub-translate/.env`).
  - Prompts for default `OPENAI_MODEL` (e.g. `gpt-5.1`, `gpt-5-mini`).
- `scripts/epub-translate extract ...`:
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