io.github.cameron-creations/numberbroom-mcp
Description
Verify US phone numbers: line type, carrier, and TCPA litigator status via the NumberBroom API.
What our measurements say
io.github.cameron-creations/numberbroom-mcp is a remote MCP server published at numberbroom.com. It has been probed 8 times since 9/12/2026. It answered in 8 of them (100.0%), a near-uninterrupted record. Median response time is 518 ms, a delay an agent will notice. It offers a narrow, focused set of 2 tools. On the protocol side it speaks the 2026-07-28 stateless spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Tool names explicitly convey their purpose (e.g., 'verify_phone_number', 'get_credit_balance').
- No overlap between tools; each serves a unique function.
Weaknesses
- First tool's description is cut off mid-sentence, reducing clarity.
- No explicit mention of error handling, rate limits, or API usage constraints beyond credit balance checks.
verify_phone_number— Description truncated, missing critical details about TCPA litigator status and activity score interpretation.verify_phone_number— No documentation of error scenarios (e.g., invalid phone formats, API rate limits).
Verdict
Event narrative
Risk: low
Advice
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 39ms → warm 43ms (penalty 0ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
verify_phone_numberVerify a single US phone number: carrier-level line type (mobile, landline, VoIP, disconnected), carrier name, an activity score, and whether the number is a known TCPA litigator. Does not check Do Not Call registries. Costs $0.20, charged against the caller's NumberBroom API credit balance — a number that fails to parse as a phone number is not charged. Get an API key at https://numberbroom.com/settings.
phonestringrequired
get_credit_balanceCheck the remaining pre-paid API credit balance for the connected NumberBroom account. Free to call — does not spend credits.
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Added to watch — era: Dual-era
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Add this badge to your README — it updates automatically as measurements change.
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