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 · Data access / search

BumbleBox

Search and triage all your mailboxes; draft replies and campaigns; send only as you allow.

Checks passed
15 / 22

1 failed · 6 not measured

Median response
272 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
17

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?
310
Publisher identityCan the publisher be traced to its source?
501

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 253 ms.

  • Pass
    Valid handshake

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

  • Pass
    Lists tools

    tools/list returned 17 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 272 ms over 2 samples in 7 days. The bar is 1000 ms. Need at least 5 samples.

  • Not measured
    Consistent (p95)

    95th percentile 288 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.

  • Fail
    Parameters documented

    16 of 32 parameters have a description (50%). 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 2026-10-22T15:55:00.506548Z, within 180 days.

  • Pass
    Open-source licence

    GitHub reports an OSI licence.

Start using BumbleBox

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 bumblebox https://api.bumblebox.ai/api/mcp

Capabilities

Tools 17

archive_email

Moves one inbox email to its mailbox's archive folder, on the mail server too. Undone by restore_to_inbox. Nothing is deleted.

Discovered
create_campaign_draft

Writes one draft inside an existing campaign, to one recipient (added to the campaign list if new), from the campaign's sender. Nothing is sent: the draft waits for the user to validate the campaign send in BumbleBox.

Discovered
draft_reply

Saves the text as the reply draft of a received email, from the address the email was written to (a brand address or the mailbox). needsIdentity: that address cannot send until the user verifies it in BumbleBox. Nothing is sent: the draft waits in BumbleBox (Pilotage › prepared replies) until the user reviews it and clicks Send. Saving again replaces the previous draft of the same email.

Discovered
get_email

One email in full: sender, recipients, date, subject, plain-text body, attachment names, folder and BumbleBox classification.

Discovered
list_calendar_events

Events of the connected Google calendars between two dates (default: the next 7 days, at most 62 days).

Discovered
list_campaign_drafts

The drafts of one campaign that wait for the user to validate them in BumbleBox (recipient, subject, plain-text body, sender), newest first, with the true totals.

Discovered
list_folders

The folders of each connected mailbox, as last synced. Trash, spam, sent and drafts are left out.

Discovered
list_missions

The user's prospection campaigns (missions), most recently active first, with the number of drafts waiting, emails sent and prospects who replied.

Discovered
list_replies_to_validate

Replies received on campaigns that still need the user: prepared reply drafts waiting for validation, and replies with no answer yet (with the stored AI triage: kind, summary, whether a human is needed).

Discovered
list_to_answer

Received emails BumbleBox classified as needing a reply and still in the inbox, newest first.

Discovered
move_email

Moves one inbox email to an existing folder of the same mailbox (see list_folders), on the mail server too. No folder is created. Undone by restore_to_inbox.

Discovered
restore_to_inbox

Moves an archived, filed or trashed email back to the inbox, on the mail server too.

Discovered
search_contacts

Contacts BumbleBox knows from the mail history (name, address, organization domain, exchange counts, last exchanges, VIP mark, note), matched on name, address or domain.

Discovered
search_emails

Searches every connected mailbox (sender, subject, preview), newest first. Operators: from:, subject:, before:YYYY-MM-DD, after:YYYY-MM-DD, in:sent (only what the user sent, from any mailbox or alias); the rest is free text. Deleted emails are not returned.

Discovered
send_reply

Replies to the sender of one received email, and only to them (no Cc, no Bcc, no attachment), from the address the email was written to. What happens next is the level the user set in BumbleBox for this kind of reply: a draft, a reply waiting for one tap (the default), or a reply that leaves after a delay the user can cancel. Anything that commits the user (amounts, bank details, acceptance, contracts, dates, links) always waits for the user, and so does a reply from an address the user has not verified (needsIdentity). The result says which one applied.

Discovered
trash_email

Moves one inbox email to its mailbox's trash when BumbleBox certifies it as noise (spam, newsletter, promotion, with a unanimous safety vote and no known contact or action word). Any other email is not moved: it becomes a proposal the user confirms in one tap in BumbleBox. Never a permanent deletion; undone by restore_to_inbox.

Discovered
update_campaign_draft

Changes the subject, body or recipient of a draft that is still a draft. Nothing is sent, and a draft the user already validated cannot be changed.

Discovered

Recent measurements

Probe history

View status
Latest stored probes. Raw probe rows are kept for 14 days.
CheckedResultResponseTools
Connected253 ms17
Connected290 ms17