Oh Fax

Outbound US/CA fax for agents: quote PDF, pay via MPP, get delivery receipt.

Should I use this

Quality & Safety

A
Description quality
93%
Schema completeness
90%
Naming quality
95%
Poisoning risk
100%
Permission match
100%
Protocol compliance
100%

Findings (1)

  • LOWTool 'get_fax_receipt' description lacks action verbin get_fax_receipt

Based on automated analysis of tool definitions and protocol compliance.

Context Cost

~557Tokens (tool definitions)
~615 BTypical response size
Minimal attention impact (0.44% of 128k context)

This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.

Install

One-Click Install

Add this to your `claude_desktop_config.json` file:

{
  "mcpServers": {
    "ohfax": {
      "url": "https://app.ohfax.com/mcp"
    }
  }
}

Remote endpoints

https://app.ohfax.com/mcpstreamable-http

What it can do

Tool inventory

Tools (4)

🟢 Read-only🟡 Write🔴 Delete⚪ Unknown
🟢quote_fax(to, document_url, document_base64)

Price a fax before committing to anything. Validates the destination and the document, counts pages, and returns an exact total plus a payment link. Free, and sends nothing. Always call this before send_fax.

Input Schema

{
  "type": "object",
  "properties": {
    "to": {
      "type": "string",
      "description": "Destination fax number. US and Canada only."
    },
    "document_url": {
      "description": "Publicly reachable URL of a PDF.",
      "type": "string"
    },
    "document_base64": {
      "description": "Base64-encoded PDF, as an alternative to document_url.",
      "type": "string"
    }
  },
  "required": [
    "to"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🔴send_fax(quote_id)

Returns the authorization instructions for sending a previously quoted fax. THIS ACTION COSTS MONEY AND CANNOT BE UNDONE: paying the returned link transmits a real document to a real fax machine. This tool itself does not charge you — it returns the exact price and a payment link, and the fax is only sent once you deliberately pay that link. Confirm the cost is acceptable before paying.

Input Schema

{
  "type": "object",
  "properties": {
    "quote_id": {
      "type": "string",
      "description": "A quote_id from quote_fax."
    }
  },
  "required": [
    "quote_id"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢get_fax_status(fax_id)

Current delivery state of a fax: awaiting_payment, paid, submitted, sending, delivered, or failed. Failed faxes include a reason you can act on.

Input Schema

{
  "type": "object",
  "properties": {
    "fax_id": {
      "type": "string"
    }
  },
  "required": [
    "fax_id"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢get_fax_receipt(fax_id)

Verifiable delivery receipt for a completed fax. Available once the fax has reached a final state. Use this to prove the workflow finished.

Input Schema

{
  "type": "object",
  "properties": {
    "fax_id": {
      "type": "string"
    }
  },
  "required": [
    "fax_id"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Recommended Prompts

retrieve_data
Get details about [item] from Oh Fax
Expected tools: get_fax_status
fetch_info
Fetch [information type] using Oh Fax
Expected tools: get_fax_status

Community

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Evidence

Recent observations

verifiedversion not recorded4 tools
verifiedversion not recorded4 tools