PromptFax

REMOTE · PROMPTFAX.APP · SCANNED AUG 3

Send a one-off fax from inside ChatGPT or Claude. Pay-per-use, $2-$4.50 per delivered fax.

Available components

+18 this week 78 78 Trust /100

Trust breakdown (6 categories)

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score →

Endpoint Security91

The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
Authorisation is enforced on tool calls, advertised via RFC 9728 protected-resource metadata. Discovery is public, which costs nothing: no tool can be invoked without a token. View diagnostics → Pass
HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
DNSSEC is configured correctly; the domain's records validate against the full chain to the root. View diagnostics → Pass
The authorisation server offers only Dynamic Client Registration (RFC 7591), which MCP 2026-07-28 deprecated in favour of Client ID Metadata Documents. View diagnostics → Partial

Transport & Reachability100

Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass

Schema Quality & AI Usability62

AI-judged instruction clarity (good).Pass
Context-footprint check failed: tool/resource definitions use about 1376 tokens (~172/item across 8 items; 8 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
Usage-examples check failed: none of the tools include examples. See how to fix → Fail

Stability & Change Management27

Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial

Tool Coverage100

100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
100% of tool parameters carry a description.Pass
Structured output schemas are declared (100% of tools); any adoption earns full credit.Pass

Capabilities100

Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass

Install

Add this component to your MCP client. Where a client-specific snippet is available, pick your client below and copy it straight into your config; otherwise use the connection detail shown.

remote · promptfax.app

Claude Codex opencode OpenClaw Hermes Other

# add to Claude Code

claude mcp add --transport http app-promptfax-promptfax https://promptfax.app/mcp

# ~/.codex/config.toml

[mcp_servers.app-promptfax-promptfax]
url = "https://promptfax.app/mcp"

// opencode.json

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "app-promptfax-promptfax": {
      "type": "remote",
      "url": "https://promptfax.app/mcp",
      "enabled": true
    }
  }
}

# add to OpenClaw

openclaw mcp add app-promptfax-promptfax --url https://promptfax.app/mcp --transport streamable-http

# ~/.hermes/config.yaml

mcp_servers:
  app-promptfax-promptfax:
    url: "https://promptfax.app/mcp"

// mcp.json

{
  "mcpServers": {
    "app-promptfax-promptfax": {
      "type": "http",
      "url": "https://promptfax.app/mcp"
    }
  }
}

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

Changelog

Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.

3 Aug 26 +1

No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.
1 Aug 26 +43
- Authorization: unverified → pass ▲ security
- MCP protocol: unverified → pass ▲ functional
- Stability: unverified → 0.20 ▲ functional
- Tool coverage: unverified → 100 ▲ functional
31 Jul 26 −37
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
30 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
29 Jul 26 +1

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.
28 Jul 26 +10
- Transport: fail → pass ▲ security
27 Jul 26 −9
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
26 Jul 26 69

First indexed and scored.

Show 5 earlier entries Hide earlier entries

Diagnostics

Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.

Captured 3 Aug 2026 · Probed https://promptfax.app/mcp

TLS valid

Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .

Subject	Issuer	Valid from	Valid until	Key	Signature	Serial
CN=promptfax.app	CN=WR3,O=Google Trust Services,C=US	17 Jul 2026	15 Oct 2026	RSA 2048	SHA256-RSA	1c10db236fe8b0b5101c633c674e8063
SANs: promptfax.app
CN=WR3,O=Google Trust Services,C=US (CA)	CN=GTS Root R1,O=Google Trust Services LLC,C=US	13 Dec 2023	20 Feb 2029	RSA 2048	SHA256-RSA	7ff005a91568d63abc22861684aa4b5a
CN=GTS Root R1,O=Google Trust Services LLC,C=US (CA)	CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE	19 Jun 2020	28 Jan 2028	RSA 4096	SHA256-RSA	77bd0d6cdb36f91aea210fc4f058d30d

DNSSEC secure

Validation of promptfax.app. — Secure

Zone	DS	Keys	Algorithms	Outcome
.	trust_anchor	20326, 38696	8, 8	Verified
app.	present	23684	8	Verified
promptfax.app.	present	2371	13	Verified
promptfax.app.				Verified address RRset verified with the apex keys

Authentication Enforced and verified

The endpoint asked for a token and published valid RFC 9728 metadata describing how to get one.

Result	Enforced and verified
Enforced	On tool calls
HTTP status	200

WWW-Authenticate challenge Bearer realm="promptfax-mcp", resource_metadata="https://promptfax.app/.well-known/oauth-protected-resource/mcp"

Bearer realm="promptfax-mcp", resource_metadata="https://promptfax.app/.well-known/oauth-protected-resource/mcp"

Protected resource metadata

Document	https://promptfax.app/.well-known/oauth-protected-resource/mcp
Retrieved	Yes
Resource	https://promptfax.app/mcp
Authorisation server	https://promptfax.app/

Transports 2 probes

Transport	URL	Outcome	Status	Location
streamable-http	https://promptfax.app/mcp	Verified	200
http (plaintext)	http://promptfax.app/mcp	HTTPS enforced	301	https://promptfax.app:443/mcp

MCP tools — 8 exposed · ~1,376 tokens

The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability.

Tool Tokens

attach_document Attach fax document ~144

Fallback/non-widget tool for binding a PromptFax document or one or more HTTPS PDF URLs into the current MCP session before requesting a quote. In ChatGPT widget sessions, prefer the widget's file controls after start_session instead of calling this tool unless the widget is unavailable or the user explicitly asks for fallback behavior.

Input Output Examples

Name	Type	Req	Description
documentId	string	—	PromptFax document identifier created by a prior upload or hosted session.
fileUrls	array	—	One or more HTTPS URLs for PDF or image documents that PromptFax should attach to the fax workflow.
sessionId	string	yes	PromptFax MCP session identifier returned by start_session. Use this to continue a session-backed fax workflow.