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Sign a message

An MCP tool from the Vercel API server, hosted on mcp.hjlabs.in.

Sign a message Sign a raw message with a KMS issuer's active signing key. Authenticate the request with a Vercel OIDC token in the Authorization: Bearer header; the issuer's policies decide which workloads are… [POST /v1/kms/issuers/{issuerId}/sign/message]

Name on the gateway: vercel_api__sign_kms_message · may change things.

Parameters

NameTypeDescription
issuerId requiredstringThe ID of the issuer.
message requiredstringBase64-encoded message to be signed.

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": "vercel_api__sign_kms_message",
  "arguments": {
    "issuerId": "…",
    "message": "…"
  }
}

Or connect the Vercel API server directly, which lists 472 tools including this one:

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

Try asking

Use the sign a message tool with issuerId set to ….

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