NPI Who
io.github.npiwho/npiwhonpiwhostreamable-httpv1.0.0Scanned
US health care providers by NPI, name or phone, with payments, Medicare, OIG and facility data.
6 tools: 2 change things and 4 only read.
- Reads private data · 1
- Reads text others write · 0
- Can send data out · 0
- No findings
Anlyon alternative
2 of these tools change something. Run those as governed actions.
Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.
Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.
Import an OpenAPI spec →Tools
Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.
6 tools
Changes things 2Claude Code: ask
data_sourcesWhich public files this data comes from, their snapshot dates, and what they do not cover.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it Which public files this data comes from, their snapshot dates, and what they do not cover.
nearby_providersThe providers with the same specialty nearest a given provider (by NPI) or a ZIP code and specialty, by distance between ZIP code centres.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it The providers with the same specialty nearest a given provider (by NPI) or a ZIP code and specialty, by distance between ZIP code centres. Up to 12.
Only reads 4Show 4 read-only tools
list_facilitiesMedicare-certified home health agencies, hospices, hospitals, nursing homes, or HRSA health centers (FQHCs) in a state, optionally one city.No findings
Why it is in this group
- The name "list_facilities" says "list": a word for reading.
Description, as the server wrote it Medicare-certified home health agencies, hospices, hospitals, nursing homes, or HRSA health centers (FQHCs) in a state, optionally one city. Up to 50 rows with page urls; the full list and a CSV are at the state page url.
lookup_phoneProviders whose registry practice phone, or a phone they published on a claimed page, is this number.No findings
Why it is in this group
- The name "lookup_phone" says "lookup": a word for reading.
Description, as the server wrote it Providers whose registry practice phone, or a phone they published on a claimed page, is this number. Any US format. Providers who asked for their phone to be withheld are not returned.
lookup_providerOne provider by NPI: the registry record, and what the public files have on them (Open Payments total, Medicare billing, OIG exclusion, Medicare clinician record, facility enrollme…Reads private dataNo findings
Why it is in this group
- The name "lookup_provider" says "lookup": a word for reading.
What it can reach
- private-dataThe description's first sentence says "file": it reads files.
Description, as the server wrote it One provider by NPI: the registry record, and what the public files have on them (Open Payments total, Medicare billing, OIG exclusion, Medicare clinician record, facility enrollments, claimed-page details) with the page section where each is. The result's url is the page to cite and to send readers to for the detail.
search_providersFind individual providers or organizations by name, optionally within a state.No findings
Why it is in this group
- The name "search_providers" says "search": a word for reading.
Description, as the server wrote it Find individual providers or organizations by name, optionally within a state. Returns up to 20 matches, best first, each with its page url. Use lookup_provider on a result for the full record.
This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.
Exfil surface
Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.
No private-data, untrusted-input, outbound path in this server alone: no tool is tagged untrusted-input or outbound.
- Reads private data1
- Reads files, mail, messages, databases, secrets, calendars or repositories.
- Reads text others write0
- Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
- Can send data out0
- Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.
Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.
Findings
Matches of fixed checks, with the text they matched.
No check matched anything in these tool definitions. That is not a safety guarantee.
History
Changes to its tool definitions and to its remote endpoint, newest first.
No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.
Install
Pinned to version 1.0.0. Values in angle brackets are yours to fill in.
claude mcp add --transport http npiwho https://npiwho.com/mcpclaude mcp add --transport http npiwho https://npiwho.com/mcpRun in a terminal.
Claude Code permissions
Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.
{
"permissions": {
"allow": [
"mcp__npiwho__lookup_provider",
"mcp__npiwho__search_providers",
"mcp__npiwho__lookup_phone",
"mcp__npiwho__list_facilities"
],
"ask": [
"mcp__npiwho__nearby_providers",
"mcp__npiwho__data_sources"
],
"deny": []
}
}Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as npiwho. Review it before you use it.
Capability tags behind 1 rule
- mcp__npiwho__lookup_provider private-data
Pin
Keep the decision: fail CI when the tools change, follow every change, or show a badge.
Pin in CI
Fail a build when the tools you reviewed are not the tools the server serves today.
curl -s "https://anlyon.dev/api/v1/servers/io.github.npiwho/npiwho/verify?hash=699d2e26e6f2b4483013f13c9fb497fe722ad30fad623dcb897ae39adb2c9868" | jq -e '.changed == false'Pinned hash 699d2e26e6f2, from Oct 25, 2026, 13:18 UTC.
Watch
Get told when its tools change: a new tool, a new description, a new class.
https://anlyon.dev/servers/io.github.npiwho/npiwho/changes.xmlAn Atom feed. Works in any feed reader or Slack's RSS app.
Badge
[](https://anlyon.dev/servers/io.github.npiwho/npiwho)Source: MCP Registry · repository. Synced Oct 25, 2026, 13:17 UTC.