US healthcare provider lookup in the CMS NPPES registry (~9.6M providers). Give an exact 10-digit NPI, or search by provider last name (+ first name), or organization name, optionally narrowed by state and taxonomy/specialty. Returns NPI, entity type (individual/organization), status, name/creden...
AI agents call medical.npi to retrieve information from Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries a public healthcare provider registry and returns informational results. It retrieves data without side effects, reversible actions, code execution, destructive operations, or financial obligations. The description explicitly states it is 'free, public-domain (CMS)' data.
From the tool's definition Tool provides lookup and retrieval of public CMS NPPES registry data. Actions are: 'lookup', 'search', 'returns' information. No modification, deletion, execution, or financial transaction capability described.
Attacks that exploit this kind of access
US healthcare provider lookup in the CMS NPPES registry (~9.6M providers). Give an exact 10-digit NPI, or search by provider last name (+ first name), or organization name, optionally narrowed by state and taxonomy/specialty. Returns NPI, entity type (individual/organization), status, name/credential or org name, taxonomies (code + description + state license), and practice address with phone. Free, public-domain (CMS). It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
Register the MCP server in PolicyLayer and add a rule for medical.npi: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Mcp. Nothing to install.
medical.npi is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the medical.npi rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for medical.npi. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
medical.npi is provided by the MCP server (@2sio/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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