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ProntoFax MCP server

Which MCP servers are ProntoFax's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-11-04

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Whose server it is
  • Registry namecom.prontofax/prontofaxverified in the MCP registry

The registry name sits under prontofax.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-11-04
  • Stateanswerschecked 2026-11-04
  • Tools2
  • Server calls itselfprontofax
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-11-04 the server answered initialize and tools/list without a sign-in. First answer in 258 ms.

Should an agent connect itNot proven either way yet
  • Whether its tools do the product's job has not been judged yet.
  • Checked on 1 of the 7 days it takes to judge reliability.

Once connected

  • Keep approval on for send_fax: they delete, send or pay without saying so.
  • send_fax change data without a sign-in: anyone with the address can call them.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 1, the first on 2026-11-04
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 1 so far
  • Answeredmeasuring1 of the 7 daily checks it takes to print a share
  • Median first answer801 ms
  • Space in an agent's context≈ 662 tokensthe definitions of all its tools (2), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results0 of 2 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

Worth a look

  • Tools that delete, send or pay, marked as not destructive: send_fax
  • Tools that change data, on a server that answers without a sign-in: send_fax

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers2 tools · read 2026-11-04
  • lookup_fax_number

    Find the fax number for a US state or federal agency, with the official source it was read from and when it was last verified. Covers Social Security field offices across 56 states and territories (search by city or state), MassHealth…

  • send_fax

    Start a fax to a US fax number. Opens a form in this chat where the user adds pages from their phone camera or a PDF, adds an optional cover page, and pays. The fax costs $2.99 flat for up to 25 pages and is charged only when delivery is…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "prontofax": {
      "type": "http",
      "url": "https://mcp.prontofax.com/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http prontofax https://mcp.prontofax.com/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://mcp.prontofax.com/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.