ISBN Validator Skill

What this skill does

Let your agent verify book ISBNs. Call it as an MCP tool to validate ISBN-10 and ISBN-13 checksums and parse their parts. You switch it on with a single toggle — no SDK and no endpoint wiring — and it answers over MCP or REST using the same key as every other skill.

See it work

A real response from the ISBN Validator Skill — exactly what your agent gets back when it makes the call.

vervekit · isbnvalidatortool call

{
  "isbn": "978-0-306-40615-7"
}

result

valid: true
isbn: 978-0-306-40615-7
type: ISBN-13
normalized: 9780306406157
formatted: 978-0-306-40615-7
checksum_valid: true
prefix: 978
group: 0

+4 more fields

Run it with your own input. Live calls happen in your dashboard, on your key.

Ways to use it

Text tooling without the ML stack

Enable ISBN Validator and your app can validate isbn — translate, analyze, clean — without hosting a model or wiring a language API.

A tool your agent invokes

Over MCP, isbnvalidator is the tool your model calls to process text mid-task, on the same connection as every other skill.

Batch it from your backend

Call ISBN Validator over REST to validate isbn across a whole queue of text in your own server-side job.

Use it in your app

Once enabled, this skill is reachable two ways — pick whichever fits how you build. Both use the same key.

For AI agentsMCP

It appears to your model as a callable tool. No extra code — the agent invokes it when a task needs it.

isbnvalidator

For apps & backendsREST

Call it from your server with one request and your key. Node, Python, Go — anything that can send a GET.

GET /v1/isbnvalidator

Ask your agent

“Enable ISBN Validator and ask your agent to validate isbn.”
“Clean this text up and tell me what's in it.”

ISBN Validator Skill, answered

How to connect it over MCP or REST.

How do I add ISBN Validator to my app or agent?

Enable the ISBN Validator Skill on VerveKit, then reach it two ways with the same key: over MCP (it appears to your agent as the isbnvalidator tool) or over REST (call it from any backend). No SDK to install and no endpoint to wire.

MCP or REST — which should I use?

Both work off one key. Use MCP when an AI agent should decide when to validate isbn — the skill shows up as a callable tool. Use REST when your own server-side code should call it directly. Many apps use both.

Which agents and frameworks does it work with?

Any MCP client — Claude, Cursor, LangChain, and custom agents all speak the Model Context Protocol, so ISBN Validator appears as a standard tool with nothing skill-specific to integrate.

How many credits does a ISBN Validator call cost?

Each call costs 1 credit. Every skill rides the same key and the same connection, so enabling more skills doesn't add more integrations to manage.

Do I need to install anything?

No SDK and no endpoint wiring — enabling the skill is a toggle. You point your agent at the VerveKit MCP endpoint (or call REST) and ISBN Validator is available immediately.

Where does the data come from, and what shows on my bill?

VerveKit runs on APIVerve, our production data engine; ISBN Validator is one of 300+ skills on the same key. Invoices and card statements show APIVERVE.

Text tooling without the ML stack

A tool your agent invokes

Batch it from your backend

ISBN Validator Skill, answered

Give your software a way to act on the world.

Scaling in production?