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 · Other

Call Desk

US and Canada calling rules: number checks, calling hours, recording consent, AI voice disclosure.

Checks passed
12 / 22

2 failed · 8 not measured

Median response
829 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
5

Tool definitions returned by this server

Independent monitoring

Health & checks

Status history

Outdated check

Last connection measurement is over 24 hours old. Current availability is unknown.

Last checked
Check summary by test group
Test areaPassedFailedUnmeasured
ConnectionCan a client connect and discover tools?
500
Reliability & speedDoes it respond consistently and quickly?
004
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?
222

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 829 ms.

  • Pass
    Valid handshake

    protocolVersion 2025-11-25, serverInfo.name Call Desk by Modern Mustard Seed.

  • Pass
    Lists tools

    tools/list returned 5 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 829 ms over 1 samples in 7 days. The bar is 1000 ms. Need at least 5 samples.

  • Not measured
    Consistent (p95)

    95th percentile 829 ms over 1 samples in 7 days. The bar is 3000 ms. Need at least 20 samples.

  • Not measured
    Reliable (uptime)

    1 of 1 attempts returned a tool list in 30 days (100%). The bar is 99%. Need at least 30 samples.

  • Not measured
    Stable tool list

    Fewer than two successful probes in 30 days, so tool-list stability is not measured.

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

    10 of 10 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.

  • Fail
    Website matches publisher

    The website host does not match the reverse-domain namespace.

  • Fail
    Source repo linked

    No 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 2026-10-11T19:11:48.464701Z, within 180 days.

  • Not measured
    Open-source licence

    No GitHub repository to ask about a licence.

Start using Call Desk

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 call-desk https://mcp.modernmustardseed.com/call-desk

Capabilities

Tools 5

ai_voice_disclosure_rules

List the laws that require a caller or conversational agent to disclose that it is AI, a bot, or an artificial or prerecorded voice, for a US state, Canadian province or phone number, or for every jurisdiction. Covers the FCC ruling that AI-generated voices are artificial voices under the TCPA (so AI voice calls need prior express consent), the federal rule that prerecorded messages identify the caller at the start, state AI and chatbot disclosure laws, and state rules on identifying automated messages. Each rule gives what must be disclosed, when, who it applies to, effective and sunset dates, whether it is in force today, the citation, a verbatim quote, the source URL and as-of date. Informational, not legal advice.

Discovered
can_i_call_now

Decide whether a call to a phone number, or to someone in a given state or province, is allowed right now or at a given time under calling-hours law: the FCC TCPA rule and FTC Telemarketing Sales Rule (8 a.m. to 9 p.m. called party's local time), every stricter state rule we verified (for example Florida, Oklahoma, Maryland, Washington and Wyoming stop at 8 p.m.; Texas Sundays start at noon; Pennsylvania bans Sundays from 2026-10-18; Kentucky starts at 10 a.m.; Maine allows automated solicitation weekdays 9 to 5 only), and in Canada the CRTC rules and British Columbia's holiday ban. Checks every time zone the number could be in, state holiday bans and future effective dates. Returns allowed or not, the reason, the window today, the next allowed time, and every rule applied with its citation, verbatim quote, source URL and as-of date. Choose call_type: sales_automated covers AI voice agents, prerecorded and autodialed sales calls. Informational, not legal advice.

Discovered
check_phone_number

Check a US, Canadian or other North American (+1) phone number before calling or texting it. Returns whether it can be a working number (N11 codes and unassigned area codes fail; 555-0100 to 0199, reserved for fiction, is flagged as fictional_range and still resolves), the E.164 form, where the area code rings (US state or territory, Canadian province, or another country on the +1 plan), whether the area code is in service, its overlays, every time zone the exchange covers with the current local time there, and a toll-fraud risk grade (block, high, medium, low) with reasons: Caribbean and Bermuda +1 codes that bill as international calls, 900 premium numbers, Pacific territory codes, non-geographic codes and the 976 exchange. Area code data from NANPA, time zones from libphonenumber; no network access. Informational, not legal advice.

Discovered
list_state_calling_rules

Show every calling rule Call Desk holds for one US state, DC, territory or Canadian province: its time zones and area codes, federal and state calling-hours rules with windows, holidays and per-day call caps, recording consent, AI disclosure and automated message rules, each with citation, quote, source URL and as-of date, plus any rule we looked for and could not verify. With no state, returns a table of every jurisdiction with hours stricter than federal, the states with no stricter rule, and the all-party recording states. Informational, not legal advice.

Discovered
recording_consent_rules

Look up whether a phone call may be recorded with one party's consent or needs every party's consent, for one or more US states, DC or Canadian provinces, by state or by the phone numbers on the call. Returns each jurisdiction's rule (one-party, all-party or mixed, such as Oregon, Connecticut, Nevada or Michigan, with the case law that decides it), the statute, a verbatim quote, the source URL and as-of date, the federal rule (18 U.S.C. 2511(2)(d)), and a bottom line for calls that cross state lines. With no input, returns the lists of all-party, mixed and one-party states. Informational, not legal advice.

Discovered

Recent measurements

Probe history

View status
Latest stored probes. Raw probe rows are kept for 14 days.
CheckedResultResponseTools
Connected829 ms5