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Hmac

An MCP tool from the Text Toolkit server, hosted on mcp.hjlabs.in.

Compute an HMAC signature of a message with a secret key, using SHA-1, SHA-256, SHA-384 or SHA-512. Use to sign or verify webhooks and API requests.

Name on the gateway: text__hmac · read-only.

Parameters

NameTypeDescription
message requiredstringThe message to sign.
key requiredstringThe secret key (text).
algorithmsha1 | sha256 | sha384 | sha512Hash function. Default "sha256".
encodinghex | base64Output encoding. Default "hex".

How to call it

Through the Smart Gateway, any client can run it by name with call_tool, or let the gateway find it with search_tools:

call_tool arguments
{
  "name": "text__hmac",
  "arguments": {
    "message": "…",
    "key": "…"
  }
}

Or connect the Text Toolkit server directly, which lists 43 tools including this one:

Run in your terminal
claude mcp add --transport http hj-text https://mcp.hjlabs.in/mcp/text \
  --header "Authorization: Bearer YOUR_API_KEY"

Try asking

Use the hmac tool with message set to ….

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