<use_case>Search for an npm package by name</use_case>
AI agents call searchNpmPackage to retrieve information from MCP Server for NPM Package Info without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a search operation to retrieve npm package metadata. It has no side effects, does not modify any data, and does not execute code or trigger external operations beyond a simple lookup query. This is a straightforward read operation with minimal security risk even if misused by an AI agent, as the worst case would be excessive API calls or information disclosure of already-public package data.
From the tool's definition Tool name 'searchNpmPackage' and description 'Search for an npm package by name' indicate a query operation that retrieves package information without modifying any data.
Documented attack patterns abuse exactly the kind of access searchNpmPackage gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Server for NPM Package Info, and nothing reaches the server without passing your rules. This is the rule we recommend for searchNpmPackage:
{
"version": "1",
"default": "deny",
"tools": {
"searchNpmPackage": {}
}
}searchNpmPackage is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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<use_case>Search for an npm package by name</use_case>. It is categorised as a Read tool in the MCP Server for NPM Package Info MCP Server, which means it retrieves data without modifying state.
Register the MCP Server for NPM Package Info MCP server in PolicyLayer and add a rule for searchNpmPackage: 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 Server for NPM Package Info. Nothing to install.
searchNpmPackage 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 searchNpmPackage 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 searchNpmPackage. 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.
searchNpmPackage is provided by the MCP Server for NPM Package Info MCP server (snyk-labs/mcp-server-npm-goof). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP Server for NPM Package Info, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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4 MCP Server for NPM Package Info tools catalogued and risk-classified — across an index of 43,000+ MCP servers.