Shelfclub
REMOTE · MCP.SHELFCLUB.APP
Search a catalog of 1.7 million books and find books by mood, vibe, pace or genre. Read-only.
Available components
Last scanned (13 hours ago)
Scores higher than 66% of remote servers
Reachable. Last reached 18 Oct 2026.
Category Entertainment and Games
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security74
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability73
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 863 tokens (~143/item across 6 items; 6 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management27
- Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage98
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 93% of tool parameters carry a description.Partial
- Structured output schemas are declared (100% of tools); any adoption earns full credit.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 6 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 17 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.
- 15 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.
- 14 Oct 26 0
- Tool “find_books_by_mood” rewrote its description, which is the text the model reads security
- Tool “get_author” rewrote its description, which is the text the model reads security
- Tool “get_book” rewrote its description, which is the text the model reads security
- Tool “get_similar_books” rewrote its description, which is the text the model reads security
- Tool “get_trending_books” rewrote its description, which is the text the model reads security
- Tool “search_books” rewrote its description, which is the text the model reads security
- “get_author” reworded the description of “id” cosmetic
- “get_book” reworded the description of “id” cosmetic
- “get_similar_books” reworded the description of “id” cosmetic
- 12 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.
- 11 Oct 26 0
- Tool “find_books_by_mood” rewrote its description, which is the text the model reads security
- Tool “get_author” rewrote its description, which is the text the model reads security
- Tool “get_book” rewrote its description, which is the text the model reads security
- Tool “get_similar_books” rewrote its description, which is the text the model reads security
- Tool “get_trending_books” rewrote its description, which is the text the model reads security
- Tool “search_books” rewrote its description, which is the text the model reads security
- Schema quality: 127 → 143 ▼ functional
- Stability: unverified → 0.03 ▲ functional
- 10 Oct 26 71
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 18 Oct 2026 · Probed https://mcp.shelfclub.app/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=mcp.shelfclub.app | CN=YR1,O=Let's Encrypt,C=US | 9 Oct 2026 | 7 Jan 2027 | RSA 2048 | SHA256-RSA | 5ec2f14491dc24e587ce7c7e587776d11c1 |
| SANs: mcp.shelfclub.app | ||||||
| CN=YR1,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | a20253f15f2691c05dc1ce13b9bcca4e |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of mcp.shelfclub.app. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| app. | present | 23684 | 8 | Verified |
| shelfclub.app. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://mcp.shelfclub.app/mcp | Verified | 200 | |
| http (plaintext) | http://mcp.shelfclub.app/mcp | HTTPS enforced | 301 | https://mcp.shelfclub.app/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
find_books_by_mood Find books by mood ~195
Find books in the ShelfClub catalog by mood, vibe, pace and genre tags. At least one tag is needed. Books that carry every requested tag are listed first, most read first; when there are fewer of those than asked for, books that carry some of the tags follow, and `matchAll` says how many of the books returned carry every tag. Each book is returned with its own tags. Returns up to 10 books, each with its ShelfClub id, authors, description, reader rating, series and shelfclub.app link. The tags are machine-generated, or voted for by at least three readers of the book.
| Name | Type | Req | Description |
|---|---|---|---|
| genres | array | – | – |
| limit | integer | – | How many books to return. |
| moods | array | – | How the book feels to read. |
| pace | string | – | How quickly the story moves. |
| vibes | array | – | The kind of reading experience. |
| Name | Type | Req | Description |
|---|---|---|---|
| books | array | – | – |
| hasMore | boolean | – | Whether more books carry these tags than were returned. |
| matchAll | integer | – | How many of `books`, counted from the first, carry every tag asked for. The books after them carry some of the tags. |
| retryAfterSeconds | integer | – | With "try_again_later", when known: how long to wait. |
| status | string | yes | "try_again_later": the service was busy and looked nothing up, so the other fields are absent. |
| tagProvenance | string | – | Where the moods, vibes, pace and genres come from. |
No examples provided.
get_author Get author ~160
Look up an author in the ShelfClub catalog by ShelfClub author id, which get_book returns for the authors of a book. Returns the author's name, biography, birth and death dates and shelfclub.app link. With `include_books`, also returns up to 10 of their books, the most recently published first, each with its ShelfClub id, description, reader rating, series, shelfclub.app link, and mood, vibe, pace and genre tags (machine-generated, or voted for by at least three readers of the book).
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | The ShelfClub id of the author, from the `authorLinks` of a get_book result. |
| include_books | boolean | – | Also return up to 10 of the author's books. |
| Name | Type | Req | Description |
|---|---|---|---|
| author | object | – | – |
| books | array | – | With `include_books`: the most recently published first. |
| booksTotal | number | – | With `include_books`: how many of their books the catalog has. |
| retryAfterSeconds | integer | – | With "try_again_later", when known: how long to wait. |
| status | string | yes | "try_again_later": the service was busy and looked nothing up, so the other fields are absent. |
| tagProvenance | string | – | Where the moods, vibes, pace and genres come from. |
No examples provided.
get_book Get book details ~178
Look up one book in the ShelfClub catalog, by its ShelfClub id or by ISBN. Returns its description, authors, reader rating, series, an edition (ISBN, page count, publisher, publication date, language), its shelfclub.app link, and its mood, vibe, pace and genre tags (machine-generated, or voted for by at least three readers of the book). A lookup by id also returns the ShelfClub author id of each author that has an author record, and which of the moods, vibes and pace readers of the book voted for, with how many did.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | – | The ShelfClub id of the book, as the other tools return it. Give this or `isbn`, not both. |
| isbn | string | – | An ISBN-10 or ISBN-13, with or without hyphens. |
| Name | Type | Req | Description |
|---|---|---|---|
| book | object | – | – |
| retryAfterSeconds | integer | – | With "try_again_later", when known: how long to wait. |
| status | string | yes | "try_again_later": the service was busy and looked nothing up, so the other fields are absent. |
| tagProvenance | string | – | Where the moods, vibes, pace and genres come from. |
No examples provided.
get_similar_books Get similar books ~128
List the books in the ShelfClub catalog whose mood, vibe, pace and genre tags overlap most with those of a given book. The tags are machine-generated, or voted for by at least three readers of the book, and a book that has none has no similar books. Returns up to 10 books, each with its ShelfClub id, authors, description, reader rating, series, tags and shelfclub.app link.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | The ShelfClub id of the book, as the other tools return it. |
| limit | integer | – | How many books to return. |
| Name | Type | Req | Description |
|---|---|---|---|
| books | array | – | – |
| retryAfterSeconds | integer | – | With "try_again_later", when known: how long to wait. |
| status | string | yes | "try_again_later": the service was busy and looked nothing up, so the other fields are absent. |
| tagProvenance | string | – | Where the moods, vibes, pace and genres come from. |
No examples provided.
get_trending_books Get trending books ~100
List the books trending on ShelfClub: the books its readers have been shelving come first, then the catalog's most widely read books. Returns up to 10 books, each with its ShelfClub id, authors, description, reader rating, series, shelfclub.app link, and mood, vibe and pace tags (machine-generated, or voted for by at least three readers of the book).
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | How many books to return. |
| Name | Type | Req | Description |
|---|---|---|---|
| books | array | – | – |
| retryAfterSeconds | integer | – | With "try_again_later", when known: how long to wait. |
| status | string | yes | "try_again_later": the service was busy and looked nothing up, so the other fields are absent. |
| tagProvenance | string | – | Where the moods, vibes, pace and genres come from. |
No examples provided.
search_books Search books ~102
Search the ShelfClub book catalog by title or author name. Returns up to 10 books, each with its ShelfClub id, authors, description, reader rating, series, shelfclub.app link, and mood, vibe, pace and genre tags (machine-generated, or voted for by at least three readers of the book).
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | How many books to return. |
| query | string | yes | A book title, an author name, or both. |
| Name | Type | Req | Description |
|---|---|---|---|
| books | array | – | – |
| exactMatch | boolean | – | False when nothing matched the query as written and `books` holds the closest titles instead. |
| retryAfterSeconds | integer | – | With "try_again_later", when known: how long to wait. |
| status | string | yes | "try_again_later": the service was busy and looked nothing up, so the other fields are absent. |
| tagProvenance | string | – | Where the moods, vibes, pace and genres come from. |
| total | number | – | How many books in the catalog match, of which `books` is the first few. |
No examples provided.
How do I install the Shelfclub MCP server?
Shelfclub is a hosted endpoint at https://mcp.shelfclub.app/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · mcp.shelfclub.app
claude mcp add --transport http app-shelfclub-books 'https://mcp.shelfclub.app/mcp'
What is the Shelfclub MCP server?
Shelfclub is an MCP server listed in the public MCP registry as app.shelfclub/books. Search a catalog of 1.7 million books and find books by mood, vibe, pace or genre. Read-only. This page covers its hosted endpoint (https://mcp.shelfclub.app/mcp).
Is the Shelfclub MCP server safe to use?
Shelfclub scores 74 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the Shelfclub MCP server expose?
Shelfclub exposes 6 tools: search_books, find_books_by_mood, get_book, get_similar_books, get_trending_books, get_author. Their descriptions and schemas cost roughly 863 tokens of context every time the server is loaded.
Does the Shelfclub MCP server require authentication?
No. We connected to Shelfclub without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Shelfclub MCP server still maintained?
Shelfclub is still listed as active in the MCP registry. We last reached this channel on 18 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.