calibre-mcp (ZehuiTIAN/calibre-mcp) is an MCP server listed on the M8ven Trust Index. It scores 74 out of 100, grade C. It declares 11 tools. No publisher has claimed this listing.

Back to MCP Trust IndexM8ven
C
Emerging
74/100
8 days ago

calibre-mcp

Enables AI assistants to search, browse, import, and manage a local Calibre ebook library, including duplicate detection and an inbox-based drop folder workflow.

→ ZehuiTIAN/calibre-mcp· listed on glama

Emerging. No concerning findings. Grades remain capped until the project builds reputation through adoption. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.

How we verified

Code Verified⚡ Live Monitored: not connected

Verified is a snapshot. Live keeps it current, and builds your track record.

⚡ Connect GitHub → continuous verification on every pushwhy connect →

Who stands behind it

ZehuiTIAN

Source: Glama

Is this your MCP?

Claim it to get a verified publisher badge, a free copy of our full audit findings, and direct contact for any high-priority issues we find. Or connect your repo for our deepest verification, Live Monitored: read-only, revoke anytime. What we access →

⚡ Connect GitHub for Live Monitored

Install from

Glama

M8ven verifies MCPs across every public registry — install directly from whichever one you prefer.

// key findings
✅
No credential exfiltration, no sensitive file access, no obfuscation
Static analysis found nothing flowing your secrets to unexpected places.
✅
Open source with a license and README
Anyone can audit the code, the license is declared, and the publisher documents what it does.
🔐
You'll be asked for 1 credential: CALIBRE_OCR_API_KEY
These are read from process.env at runtime. Make sure you trust where they’ll be sent.
// environment variables
To run this server yourself, you supply these values. They go in your own MCP client configuration and stay on your machine. The secret label means the value is sensitive, not that the server mishandles it.
configXDG_CONFIG_HOME
configCALIBRE_LIBRARY_PATHThe library your Calibre GUI uses (most-used library from gui.json, else the default library)
configCALIBREDB_PATHcalibredb on PATH, then platform install locations (macOS app bundle, C:\Program Files\Calibre2\)
configPROGRAMFILES
configCALIBRE_INBOX_DIRDisabled (tool errors if used)
configCALIBREDB_TIMEOUT300
configCALIBRE_TEXT_CACHE_DIROS temp dir (not persistent across reboots)
configCALIBRE_CONVERT_TIMEOUT
configCALIBRE_OCR_PROVIDERanthropic
🔐 secretCALIBRE_OCR_API_KEY— (required for ocr_book)
configCALIBRE_OCR_MODELprovider default
configCALIBRE_OCR_BASE_URLOptional API base URL override (proxies/gateways) —
configCALIBRE_OCR_MAX_PAGES500
// quality suggestions

Tool annotations

No tools have read-only/destructive annotations

Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.

All four hints declared on every tool

11/11 tools missing one or more hints — library_info (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); search_books (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); list_books (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +8 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.

For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.

Claim the listing to review these findings one by one and send us a correction where you disagree, straight to the team. Claiming also means we tell you when the grade moves, and reach you first if we find anything urgent.

// full audit trail
The findings above are the summary. The full trail, every check we ran, each deduction, the network hosts observed and the dependency advisories, goes to verified publishers, along with an alert whenever a new one lands. Verified publishers can also review each finding and dispute it in one click. Publisher corrections have sharpened several of our checks this month, because the maintainer knows the codebase better than any scanner.
// improvement guidance — verified publishers only
We have 2 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
// embed badge in your README
[![M8ven Score](https://m8ven.ai/badge/mcp/zehuitian/calibre-mcp)](https://m8ven.ai/mcp/zehuitian/calibre-mcp)
Shows your grade and updates automatically. Prefer no grade? Append ?variant=verified to the badge URL.
commit: 0dbb4b842b0261231a3b7c5c74949afc4e9d9e61
code hash: 7ddb0e9f5f20d8055a1694102979dd5e899b1e503b461528234d2d23f9122d14
verified: 9/2/2026, 5:18:28 PM
view raw JSON →
Check MCPs from inside your assistant
Tool Check · MCP

Vetting this one by hand? Tool Check is an MCP that scores other MCPs. Add it once and ask Claude, ChatGPT, or any MCP client to grade a server, surface CVEs, check the publisher, and suggest safer alternatives — before you install.

https://m8ven.ai/api/mcp/tool-check
check_toolsearch_toolscompare_toolsrecommend_alternativescheck_publisherreport_concern
How to add it →Free · no account needed · works in any MCP client