ValidKit - Validation and Formatting Tools

Deterministic validation and formatting tools for agents over MCP.

CommunityOnlineNo sign-inGlobalFreeCan modify data

What it can do

  • Validate Card: Validate a payment card number: Luhn checksum plus brand detection (visa, mastercard, amex, discover, diners, jcb, unionpay, maestro). Returns a masked last-4 form. Deterministic, no ne
  • Validate Iban: Validate an IBAN with mod-97 checksum and per-country length rules. Returns country, length, and a space-grouped formatted form.
  • Validate Email: Check email address syntax (RFC-pragmatic) and split it into local and domain parts. Deterministic syntax check only - no MX/network lookup.

What data it sees

Do you need an account

No: the server works without sign-in

Deterministic validation and formatting tools for agents over MCP. Validate and normalize emails, URLs, phone numbers, credit cards, IBANs, postal codes and other structured input. Pure computation: no AI, no API keys, no outbound calls, and the same input always returns the same verdict.

How to connect

How to connect ValidKit - Validation and Formatting Tools to Claude

The server address to paste into Claude settings:

https://validkit-api--ghdejr11.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect ValidKit - Validation and Formatting Tools to ChatGPT

The server address to paste into ChatGPT settings:

https://validkit-api--ghdejr11.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect ValidKit - Validation and Formatting Tools to Cursor

The server address to paste into Cursor settings:

https://validkit-api--ghdejr11.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (5)

Raw names from tools/list. Only developers need these.

validate_cardValidate a payment card number: Luhn checksum plus brand detection (visa, mastercard, amex, discover, diners, jcb, unionpay, maestro). Returns a masked last-4 form. Deterministic, no network, no card data stored.
validate_ibanValidate an IBAN with mod-97 checksum and per-country length rules. Returns country, length, and a space-grouped formatted form.
validate_emailCheck email address syntax (RFC-pragmatic) and split it into local and domain parts. Deterministic syntax check only - no MX/network lookup.
slugifyConvert any string into a clean URL slug: unicode-normalized, lowercased, non-alphanumerics collapsed to a separator (default "-").
convert_caseConvert text between identifier cases: camel, pascal, snake, kebab, constant, title, sentence. Omit target to get all forms at once.