<use_case>Read a file from disk</use_case>
AI agents call ReadFile 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 retrieves file contents without modifying, deleting, or executing anything. It is a straightforward read operation. Severity is low because reading local files poses minimal risk unless the AI agent accesses sensitive credentials or private data, but that is a configuration/authorization issue rather than an inherent property of the tool itself.
From the tool's definition Tool name 'ReadFile' and description 'Read a file from disk' clearly indicate a retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access ReadFile 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 ReadFile:
{
"version": "1",
"default": "deny",
"tools": {
"ReadFile": {}
}
}ReadFile 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>Read a file from disk</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 ReadFile: 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.
ReadFile 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 ReadFile 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 ReadFile. 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.
ReadFile 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.