send_fax
Send a fax to a US or Canada phone number. Accepts PDF, DOC, DOCX, JPG, JPEG, TXT files (max 10) as base64-encoded content.
This record as markdown: /tools/com-gotfreefax-mcp/send-fax.md
What send_fax does on GotFreeFax
AI agents use send_fax to commit financial operations through GotFreeFax, usually the final step of a payment, billing, or trading workflow. A call moves real money.
| Parameter | Type | Required | Description |
|---|---|---|---|
files | array | Yes | Array of files to fax |
fax_number | string | Yes | Destination fax number (10 digits, US or Canada) |
notify_url | string | — | Optional URL to receive fax completion notification |
Parameters from the server's own tool schema.
Why send_fax is rated Critical
While the tool itself sends a fax, the server context makes clear this is a paid service where sending faxes consumes purchased credits. Misuse by an AI agent could result in unintended financial expenditure by consuming credits. The Financial category applies as it commits financial obligations (credit consumption) on behalf of the user.
From the tool's definition Send a fax to a US or Canada phone number... GotFreeFax server description mentions 'free or paid faxes' and sibling tool 'purchase_credits' implies sending faxes can consume paid credits
Risk signalsAccepts file system path (files[].filename) · Accepts raw HTML/template content (files[].content)
Attacks that exploit this kind of access
The rule that runs send_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_fax, this is the rule to start with:
Any call to send_fax is blocked until a human approves it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect GotFreeFax, apply this rule, and every send_fax call is checked against it from then on.
Questions about send_fax
Send a fax to a US or Canada phone number. Accepts PDF, DOC, DOCX, JPG, JPEG, TXT files (max 10) as base64-encoded content. It is categorised as a Financial tool in the GotFreeFax MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
send_fax accepts 3 parameters: files, fax_number, notify_url. Required: files, fax_number. The full parameter table on this page comes from the server's own tool schema.
Register the GotFreeFax MCP server in PolicyLayer and add a rule for send_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.
send_fax is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the send_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.
Set action: deny in the PolicyLayer policy for send_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.
send_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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