Does the plugin change tags it did not create?

No. Existing manual tags are preserved and duplicates are ignored. Automatic application is disabled by default; suggestions must be confirmed, uncertain or close candidates stay review-only, and a restore action only works while books are unchanged since the last application.

What book data leaves my machine?

Metadata-only mode sends title, authors, the description without HTML, language and series, but not existing tags. Epub-excerpt mode adds the table of contents and up to eight samples within the configured character limit; the full book file is never sent, and OCR or DRM removal is unsupported.

What do the default thresholds mean for how much review I get?

Defaults are an 85% assignment threshold, an 8-point closeness margin and 80% evidence confidence, and scores must exceed 50% even with a 50% threshold. One-tag mode needs the top candidate plus no likely alternative inside the margin, while multiple-tags mode takes every category reaching its own threshold and leaves close ones optional.

How do I install it and what calibre does it need?

Download JEVBookTags.zip from GitHub Releases, use that plugin ZIP rather than a source or media archive, then calibre Preferences → Plugins → Load plugin from file and restart. It requires calibre 9.0 or newer, and the demo media shows native verification only on calibre 9.13 on macOS.

What will a whole-library run cost me?

Jev is listed at $0.042 per million input tokens with output free, and the plugin shows newly used input tokens in its results, though billing and credit balance are controlled by TypeSafe. Checked on 1 October 2026, new TypeSafe accounts do not receive free signup credits, so verify your balance before a large run.

What happens when I re-run it or need to undo an application?

Successful evaluations are cached per library, so re-running does not repeat them, and a cached response shows zero new tokens without meaning the original request was free. Changing model, input or category descriptions creates a distinct request, threshold and assignment-mode changes only recalculate, and failed rows retry on their own. Restore works only if books have not changed since the last application.

CommunityJev Tools & CLIs

JEV Book Tags

Calibre plugin that asks Jev typed questions about each book's genre and subjects, applies configurable per-category probability thresholds, preserves existing tags and leaves uncertain results for manual review. Supports single-book, selected-books and whole-library classification with caching, CSV export and restore.

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Stars: 0
Language: Python
Published by: Community
Last verified: Oct 2026

iamjonatha/jev-book-tags

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AI-assisted book tagging for calibre using TypeSafe AI JEV: single-book and batch classification, configurable categories, reviewable suggestions.

Forks: 0
Last pushed: Updated Oct 2026

Repo stats from the GitHub API, cached Oct 2026.Homepage

About this project

JEV Book Tags is a calibre plugin that uses TypeSafe AI JEV to suggest subject and genre tags for books in a calibre library. It preserves existing tags and lets you review suggestions before applying them. Free and independent: this plugin is free, open-source software (GPL-3.0-or-later). It is not affiliated with, sponsored by, or endorsed by TypeSafe AI or the calibre project. There are no referral or affiliate links. TypeSafe AI is a separate service: using its API requires your own key and may incur charges.

Quoted from the project's README. Read the full README.

Tagscommunity calibre library classification

Works forJev for Classification

Used inJev for Education

Languages: Python
Capabilities: Open sourceRequires API key

Highlights

Real 32-book demo: 31 ready and 1 flagged for review, with a 95% Programming category threshold.
Defaults are an 85% assignment threshold, an 8-point closeness margin and 80% evidence confidence.
Sends metadata only, or metadata plus up to eight EPUB samples within a configurable character cap.
Requires calibre 9.0+; native verification so far only on calibre 9.13 on macOS.

Watch out

The README states GPL-3.0-or-later, but GitHub's license field reports NOASSERTION, so no SPDX id could be verified. It sends book metadata or partial EPUB excerpts to TypeSafe's hosted API, needs your own key, and the README notes new accounts may not include free credits.

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JEV Book Tags

About this project

Highlights

Questions about this entry

Does the plugin change tags it did not create?

What book data leaves my machine?

What do the default thresholds mean for how much review I get?

How do I install it and what calibre does it need?

What will a whole-library run cost me?

What happens when I re-run it or need to undo an application?

What license is it actually under?

More Jev resources like this

From the Jev guides

From the Jev community