MCP HeartbeatTHE MCP OBSERVATORY
Public workspace

Explore

Evidence for your next connection.

Independent measurements of remote MCP servers. Every observation has a timestamp.

Read-only probes

MCP server · Communication & messaging

Faxbeep

Test fax numbers for AI agents. Send a test fax or scan-to-email, then read what Faxbeep received.

Checks passed
15 / 22

0 failed · 7 not measured

Median response
730 ms

Median of successful probes over 7 days

30-day uptime
Not measured

Share of countable probes over 30 days, including daily rollups. Auth challenges are excluded.

Discovered tools
3

Tool definitions returned by this server

Independent monitoring

Health & checks

Status history

Responded

The server completed its last measured handshake. This is an observation, not a guarantee.

Last checked
Check summary by test group
Test areaPassedFailedUnmeasured
ConnectionCan a client connect and discover tools?
500
Reliability & speedDoes it respond consistently and quickly?
103
Access & authenticationWhat is required to use this server?
102
Tool qualityAre the tool definitions usable by an agent?
400
Publisher identityCan the publisher be traced to its source?
402

Unmeasured means there is not enough evidence to decide. How these checks work

Inspect individual checks 22 recorded

Core

  • Pass
    Reachable

    Latest probe returned HTTP 200 in 651 ms.

  • Pass
    Valid handshake

    protocolVersion 2025-11-25, serverInfo.name Faxbeep.

  • Pass
    Lists tools

    tools/list returned 3 tools.

  • Pass
    Current protocol

    Negotiated 2025-11-25. The bar is 2025-06-18 or newer.

  • Pass
    HTTPS

    The endpoint URL is https.

Performance

  • Not measured
    Fast (p50)

    Median latency 730 ms over 2 samples in 7 days. The bar is 1000 ms. Need at least 5 samples.

  • Not measured
    Consistent (p95)

    95th percentile 801 ms over 2 samples in 7 days. The bar is 3000 ms. Need at least 20 samples.

  • Not measured
    Reliable (uptime)

    2 of 2 attempts returned a tool list in 30 days (100%). The bar is 99%. Need at least 30 samples.

  • Pass
    Stable tool list

    No tool was removed and no required parameter was added in the last 30 days.

Access

  • Pass
    Open access

    tools/list succeeded with no credential, and the record declares none.

  • Not measured
    Standard auth

    Auth is not required, so the OAuth metadata check does not apply.

  • Not measured
    Free tier cited

    No publisher quote has been checked.

Tools

  • Pass
    Tools described

    Every tool description is at least 20 characters.

  • Pass
    Valid input schemas

    Every inputSchema is a JSON Schema object.

  • Pass
    Parameters documented

    5 of 5 parameters have a description (100%). The bar is 80%.

  • Pass
    Safety hints

    Every tool sets readOnlyHint or destructiveHint.

Publisher

  • Pass
    Verified namespace

    Listed in the Official MCP Registry.

  • Pass
    Website matches publisher

    The website host matches the reverse-domain namespace.

  • Pass
    Source repo linked

    A repository URL is on file.

  • Not measured
    Repo owner matches

    This namespace is not an io.github login, so the owner comparison does not apply.

  • Pass
    Recently updated

    Updated 2026-11-05T20:50:55.20401Z, within 180 days.

  • Not measured
    Open-source licence

    The GitHub licence lookup has not returned an OSI result yet.

Start using Faxbeep

Connect to this server

Choose your client, copy the configuration, then enable the server in your client’s MCP settings.

Run this command in your terminal, then restart Claude Code.

Claude Code

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

Capabilities

Tools 3

get_test_fax

Get one test fax by its slug (fax_ and 8 characters from 0-9 and a-f, for example fax_1a2b3c4d) or by the URL of its page on faxbeep.com (view_url, with or without a language prefix such as /de). The result is the fax object, the same as an item of list_test_faxes, and after it an image of page 1 when one can be read. A client can draw that image very small. In a chat that shows images, also show thumbnail_url as an image in your answer. Give view_url for the full page. A fax that is not found gives an error result: a new fax can take a while to appear, and a fax that is still processing is not found yet. A fax that was removed, by request or after 30 days, gives the error result "This fax was removed, or it is older than 30 days." Its files are deleted, so it cannot be read again. For a sample answer, use fax_example (a published sample fax) or fax_example_removed (the answer for a removed fax).

Discovered
get_test_numbers

Get the Faxbeep test fax numbers, the test email addresses and the limits. Call this first, before the person sends a test. Each item of "numbers" is a test fax number: "local_format" is the number to dial inside its country, "international_format" from any other country. The person sends a fax to it from a fax machine or a fax service. Each item of "email_addresses" takes an email with one PDF, TIFF or JPEG attachment, for a scan-to-email or Internet fax test. "email_addresses" is left out while the email test is off. Every test that Faxbeep receives is public on faxbeep.com for 30 days. Tell the person not to send a private document. "limits" has the limits of the email test: "email_max_message_bytes" is the size of the whole email, and email encoding adds about a third, so the attachment can be about three quarters of it. "troubleshooting_url" is the docs page with each refusal message of the email test and its fix. "now" is the server time. Use it as "since" of list_test_faxes: call this tool, or take "now" from your last result, just before the person sends the test. Do not use your own clock.

Discovered
list_test_faxes

List the test faxes that Faxbeep received and published, newest first. The list is public and holds the tests of everyone. Each item of "faxes" is a fax object: slug, source ("phone" or "email"), from (the sender, masked as on faxbeep.com, or null), received_at, page_count, file_size, pdf_url, thumbnail_url and view_url (the page of the fax on faxbeep.com). In the result, "since" is the start time that was used, and "now" is the server time. The result holds at most "limit" faxes (20 when not given), newest first, with no paging. When "faxes" has "limit" items, there can be more: narrow the list with from, page_count or a since closer to the test. Set "since" to the "now" value that get_test_numbers or list_test_faxes returned just before the person sent the test, and keep it fixed while you poll. Do not use your own clock. Do not move since to the newest received_at: a long fax can appear after a newer, shorter one. Without "since", the list covers the last 24 hours. A match by time, sender or page count narrows the candidates. It does not prove that a fax is the person's, because other people send tests at the same time. Show the person the view_url so they can check the page. In a chat that shows images, also show thumbnail_url as an image in your answer. An empty list is a normal answer while a fax is on its way. A new fax usually appears within a minute after the call ends or the email is sent; a few take longer. Wait about 30 seconds between calls, and stop after about 10 minutes. A fax is public for 30 days, then it is removed. For a sample answer, set from to FAXBEEP-EXAMPLE: the result is the sample fax fax_example, whatever since says. The sample has a fixed date in the past, older than 30 days, and it stays available.

Discovered

Recent measurements

Probe history

View status
Latest stored probes. Raw probe rows are kept for 14 days.
CheckedResultResponseTools
Connected651 ms3
Connected809 ms3