send_free_fax

SERVERGotFreeFax SOURCEhttps://www.gotfreefax.com/mcp

Medium RISK CLASS

Category Write

Parameters 114 required

Recommended Rate-limitedsee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/com-gotfreefax-mcp/send-free-fax.md

WHAT IT DOES

What send_free_fax does on GotFreeFax

AI agents use send_free_fax to create or update resources in GotFreeFax, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your GotFreeFax environment.

Parameter	Type	Required	Description
`text`	string	—	Fax body text. Either text or files must be provided.
`files`	array	—	Up to 3 files. Each must be base64-encoded. Free faxes are limited to 3 pages total across text + files.
`subject`	string	—	Subject line (optional).
`fax_number`	string	Yes	Destination fax number (10 digits, US or Canada).
`sender_fax`	string	—	Sender's fax number (optional).
`cover_sheet`	boolean	—	Include cover sheet (default true).
`sender_name`	string	Yes	Sender's name (required).
`sender_email`	string	Yes	Sender's email address. A confirmation link will be sent here; the fax does NOT actually send until the user clicks that link.
`receiver_name`	string	Yes	Receiver's name (required).
`sender_company`	string	—	Sender's company (optional).
`receiver_company`	string	—	Receiver's company (optional).

Parameters from the server's own tool schema.

RISK

Why send_free_fax is rated Medium

The tool sends a fax (an external communication), which is a Write action — it creates an outbound message to a third party. It is not purely destructive or financial (no money moves for the free tier). The confirmation-link gate reduces immediate blast radius, but an AI agent could still submit fax jobs en masse or send unwanted content to arbitrary fax numbers, warranting medium severity.

From the tool's definition Send a free fax to a US or Canada number... Returns a job_id immediately, but the fax does NOT send until the sender clicks a confirmation link emailed to sender_email.

Risk signalsAccepts file system path (files[].filename) · Accepts raw HTML/template content (files[].content) · High parameter count (13 properties)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs send_free_fax safely

PolicyLayer is an MCP gateway: it sits between your AI agents and GotFreeFax, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For send_free_fax, this is the rule to start with:

send_free_fax Rate-limited

send_free_fax stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "send_free_fax": {
      "limits": [
        {
          "counter": "send_free_fax_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect GotFreeFax, apply this rule, and every send_free_fax call is checked against it from then on.

FAQ

Questions about send_free_fax

What does the send_free_fax tool do? +

Send a free fax to a US or Canada number (no account required). Limited to 3 pages total and 2 sends per email/IP per day. Returns a job_id immediately, but the fax does NOT send until the sender clicks a confirmation link emailed to sender_email. The daily-limit check happens at click time, not at submission — a submitted fax may still be rejected if the limit is hit by then; the agent can detect this by calling check_fax_status after the user reports clicking the link. If the document exceeds the free page limit, the response will suggest using purchase_credits to buy a prepaid account. It is categorised as a Write tool in the GotFreeFax MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does send_free_fax accept? +

send_free_fax accepts 11 parameters: text, files, subject, fax_number, sender_fax, cover_sheet, sender_name, sender_email, receiver_name, sender_company, receiver_company. Required: fax_number, sender_name, sender_email, receiver_name. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on send_free_fax? +

Register the GotFreeFax MCP server in PolicyLayer and add a rule for send_free_fax: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches GotFreeFax. Nothing to install.

What risk level is send_free_fax? +

send_free_fax is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit send_free_fax? +

Yes. Add a rate_limit block to the send_free_fax rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block send_free_fax completely? +

Set action: deny in the PolicyLayer policy for send_free_fax. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides send_free_fax? +

send_free_fax is provided by the GotFreeFax MCP server (https://www.gotfreefax.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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