Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add sandraschi/calibremcp --skill library_healthgit clone --depth 1 https://github.com/sandraschi/calibremcpWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/sandraschi/calibremcp/library_health)<a href="https://agentmods.dev/skills/sandraschi/calibremcp/library_health"><img src="https://agentmods.dev/badge/skills/sandraschi/calibremcp/library_health/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/sandraschi/calibremcp/library_health"><img src="https://agentmods.dev/badge/skills/sandraschi/calibremcp/library_health.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00000 | $0.00545 |
| Opus 5 | $0.00000 | $0.00272 |
| Sonnet 5 | $0.00000 | $0.00109 |
| Haiku 4.5 | $0.00000 | $0.00055 |
Grade A, and why
library_health scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
1 near-identical copy found in the catalogue:
- library_health — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 37 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Library Health
Description: Analyze Calibre library health: duplicate detection, missing metadata, orphaned records, format coverage, tag consistency, cover completeness, and integrity validation.
Trigger Phrases
- "Check my library for issues"
- "Find duplicate books"
- "What books are missing covers?"
- "Validate my library integrity"
- "Clean up my metadata"
- "Show me library health report"
- "Find books with missing authors or tags"
Tools
manage_analysis(operation="duplicates")— Detect duplicate entries by title similarity + author match. Returns grouped duplicate candidates with merge suggestions.manage_analysis(operation="health")— Full library health report: total books, missing metadata count, format distribution, cover coverage, tag frequency.manage_library_operations(operation="integrity_check")— Database integrity scan: checks calibre database for orphaned records, broken format links, missing files.manage_metadata(operation="show", book_id=...)— Inspect individual book metadata for quality assessment.manage_tags(operation="list")— List all tags in use. Shows frequency; reveals typos and inconsistent capitalization.manage_metadata(operation="update", book_id=..., field=..., value=...)— Fix individual metadata issues.- Bulk metadata tools — Apply fixes across multiple books at once.
Workflow
- Duplicate sweep: Run
manage_analysis(operation="duplicates")first. Review grouped candidates. Merge or delete duplicates. - Health report: Run
manage_analysis(operation="health")for an overview. Note missing covers, authors, or tags. - Tag hygiene: Run
manage_tags(operation="list"). Look for variants: "sci-fi" vs "scifi" vs "science-fiction". Normalize via bulk metadata update. - Format audit: Health report shows format distribution (epub, mobi, pdf, azw3). Identify books missing your preferred format. Use Calibre conversion tools to fill gaps.
- Cover recovery: Books missing covers: use
manage_metadata(operation="download_cover", book_id=...)for each, or batch via agentic workflow. - Integrity validation: Run
manage_library_operations(operation="integrity_check"). Fix any broken format links or dangling orphans.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 37 lines · 0 tokens per session scan A 47659062d5ac
library_health is a skill published in the GitHub repository sandraschi/calibremcp (42 stars, last pushed yesterday), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 545 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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