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Numbers Online — phone intelligence MCP server

online · 100% uptime
by numbers.online·online.numbers/numbers-online·v1.0.0
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Read-only phone intelligence for AI voice agents — line type, risk, DNC, signed receipts.

B79/100grade B
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Numbers Online — phone intelligence tools (4)

write = sends, deletes, buys or posts
  • caller_riskFree

    Return a labeled, low-confidence risk read for an inbound caller: a spam signal (0–100, higher = riskier), verstat passthrough, and a first-party do-not-contact (DNC) signal — without a name dip. A supplementary input to the agent's own policy, never a verdict on whether to accept or reject the call. Supply the call's STIR/SHAKEN verstat to fold it into the signal — a failed validation raises the risk.

  • dnc_checkFree

    Return a first-party do-not-contact signal (suppress / no_match / unknown) for a number, sourced ONLY from suppression preferences registered and verified by the number's own owner inside Numbers Online — never a copy of any government or licensed do-not-call registry. "suppress" = the owner asked not to be contacted on this channel; "no_match" = no suppression preference on record (absence of suppress is not consent); "unknown" = the number could not be evaluated. Comes with a signed receipt recording the status "as of T". Advisory input to the agent's own process — it does not assert that a call is lawful.

  • line_typeFree

    Return only the deterministic fields for a number — validity, line type (mobile / fixed line / VoIP / …), range carrier, country, and formatting. No paid dip; a free, fast classification a voice agent can call before deciding to enrich.

  • phone_lookupFree

    Return a supplementary, low-confidence intelligence bundle for a phone number: validity, formatting, line type, range carrier, country, caller name (CNAM, where available), STIR/SHAKEN verstat (supply the call's verstat to fold it into the spam signal), a labeled spam signal, and a first-party do-not-contact (DNC) signal — a suppression preference registered by the number's own owner, never a copy of any government registry. Advisory only — the agent keeps every routing and dialing decision.

Public scan report

scanner v0.1.9 · 2026-09-26 · same rubric, same numbers if you re-run it

no findings
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 1050ms20/20
  • Tool poisoning4 tool descriptions checked15/15
  • Auth qualityopen endpoint, read-only tools10/15
  • Maintenancelast push 102 days ago8/15
  • Maintainer identitynamespace and repository owner differ; website matches verified namespace6/10
Overall 79/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Numbers Online — phone intelligence compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
79/100
higher than 58% of 48,255 servers
Tools
4
the typical server has 7
Tools that change things
0%
typical: 0%. Fewer write tools means less an agent can break
Uptime
100%
of our recent checks; the typical remote server answers 100%
Response time
76 ms
faster than 88% of 30,031 servers

What its tools let an agent do: 4 read

Install Numbers Online — phone intelligence in Claude Code, Cursor or VS Code

claude mcp add --transport http numbers-online https://numbers.online/api/v1/mcp
Add to Cursor

What the publisher says

From the Numbers Online — phone intelligence repository's README, as published. We do not edit it. Read it on GitHub

Numbers Online — phone-intelligence MCP server

A hosted, read-only Model Context Protocol server that gives an AI voice agent phone intelligence in a single call: who is this inbound caller, and is this outbound number one to think twice about dialing — before it burns agent minutes.

  • Endpoint: POST https://numbers.online/api/v1/mcp (Streamable HTTP, JSON-RPC 2.0)
  • Transport: remote / hosted — nothing to install or run. Point your agent at the URL.
  • Auth: Authorization: Bearer for tool calls; discovery is public.
  • Docs: https://numbers.online/docs/integrations · Site: https://numbers.online

Positioning. Every output is an advisory, low-confidence supplementary signal.

The calling agent keeps every routing and dialing decision and remains responsible for

compliance. Nothing here asserts that a call is lawful, unlawful, "safe", or "spam".

Tools

Four read-only tools (all annotated readOnlyHint, idempotentHint). Discover them live with tools/list (no auth required).

About the DNC signal

The DNC signal is first-party, consent-first: it reflects a do-not-contact preference registered and verified by the number's own owner inside Numbers Online. It is not a copy, mirror, or replica of any government or licensed do-not-call registry. The values:

  • SUPPRESS — the owner registered a do-not-contact preference for this channel.
  • NOMATCH — no suppression preference on record (absence of suppression is not** consent).
  • UNKNOWN — the number couldn't be evaluated.

Treat it as a supplementary input to your own TCPA process, never a verdict that a call is lawful. (Reassigned-number status is inherently a carrier/FCC dataset and is intentionally not offered as a first-party signal — there's no reassigned_check tool.)

Connect

Any MCP client (Claude Desktop, Claude Code, IDEs)

Add a remote server pointing at the endpoint. Example mcp.json fragment:

{
  "mcpServers": {
    "numbers-online": {
      "type": "streamable-http",
      "url": "https://numbers.online/api/v1/mcp",
      "headers": { "Authorization": "Bearer YOUR_API_KEY" }
    }
  }
}

A key needs the mcp use case. initialize, ping, and tools/list work without auth (capability discovery); tools/call is fail-closed and requires the key.

Vapi

Register Numbers Online as an MCP tool — the transport literal is shttp (see integrations/mcp/vapi-mcp-tool.json). A Vapi custom-function-tool alternative lives at integrations/vapi/numbers-online-tool.json.

Retell

Point your agent's call_inbound webhook at the drop-in config in integrations/retell/inbound-webhook.json. It always returns HTTP 200 within Retell's budget (fail-open) so a slow lookup never keeps the caller ringing.

Full walkthrough: docs/ai-voice-agents.md.

Quick smoke test

# discover tools (no auth)
curl -s https://numbers.online/api/v1/mcp \
  -H 'content-type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Numbers Online — phone intelligence: common questions

Is Numbers Online — phone intelligence MCP server safe?
Mostly: it is graded B (79/100). Read the Numbers Online — phone intelligence safety report
How do I install Numbers Online — phone intelligence?
It runs remotely at numbers.online. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Numbers Online — phone intelligence need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Numbers Online — phone intelligence maintained?
The last commit was 141 days ago (2026-06-16). The latest release is v1.0.0.
Is Numbers Online — phone intelligence up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
What can I use instead of Numbers Online — phone intelligence?
Servers from other publishers that do the same job: Nautilus Compass Memory MCP server.
How does Numbers Online — phone intelligence compare with other MCP servers?
safety score 79/100 (higher than 58% of 48,255 servers); tools 4 (the typical server has 7); tools that change things 0% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

Alternatives to Numbers Online — phone intelligence

Same job from other publishers: the closest match first, then the best rated.

  • Nautilus Compass Memory
    Local-first long-term memory for AI agents, with byte-recomputable signed verification receipts.
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