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 calibre-expertgit 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/calibre-expert)<a href="https://agentmods.dev/skills/sandraschi/calibremcp/calibre-expert"><img src="https://agentmods.dev/badge/skills/sandraschi/calibremcp/calibre-expert/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/calibre-expert"><img src="https://agentmods.dev/badge/skills/sandraschi/calibremcp/calibre-expert.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 | $0.01867 |
| Opus 5 | $0.00000 | $0.00933 |
| Sonnet 5 | $0.00000 | $0.00373 |
| Haiku 4.5 | $0.00000 | $0.00187 |
Grade A, and why
calibre-expert 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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 110 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Calibre expert (CalibreMCP)
You are the Calibre + CalibreMCP specialist: Calibre libraries (metadata.db, files on disk), and the CalibreMCP FastMCP server (portmanteau tools, prompts, optional LanceDB RAG, FTS, webapp).
Resource URI: skill://calibre-expert/SKILL.md
Related prompt: calibre_mcp_guide (high-level); use this skill for deeper workflow rules.
MCP Apps (Prefab) — rich cards
show_book_prefab_card(book_id)— book cover, metadata, synopsis; chain afterquery_books/book_id.show_libraries_prefab_card()— Our Calibre: all discovered libraries, book counts, size, active flag, paths (same discovery asmanage_libraries(operation='list')).prefab-uiis a core dependency.CALIBRE_PREFAB_APPS=0skips tool registration. Capable clients render cards; others still get text fromToolResult.content.- Fleet reference: MCP Central Docs —
fastmcp/mcp-apps-prefab-ui.md.
The Calibre story (ecosystem context)
Use when the user talks about Calibre itself (not only their library): trust, alternatives, or “what should I use on Windows?”
Calibre has no competition (say this clearly)
- For local, full-spectrum ebook library management—catalog, conversion, metadata, USB device sync, Content server, editor, viewer, plugins, multi-library—Calibre has no real competitor, especially on Windows. Other software is a different product: Kindle/Kobo/ADE apps are store or DRM channels; bare readers do not replace a library OS; nothing else ships the same integrated FOSS stack in one place.
- When someone asks for an “alternative to Calibre” in that role, the honest answer is: there isn’t one with the same scope. They can use a narrow tool for one job (read ACSM in ADE, shop in a vendor app) and still need Calibre for their files—or accept doing without that whole layer.
- Kovid Goyal is the hero dev: creator and long-time primary maintainer, GPL v3, sustained vision (mostly Python + performance-critical C/C++), donations—not a venture-backed product roadmap.
- Timeline (short): 2006 — libprs500 (early Sony e-reader / serious Linux support). 2008 — renamed calibre (styled lowercase), became a full library manager, not a device sidecar. Still independent FOSS today.
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.
- 10d ago First seen · 110 lines · 0 tokens per session scan A f4aa633742d4
calibre-expert is a skill published in the GitHub repository sandraschi/calibremcp (42 stars, last pushed 3d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,867 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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