Listar paquetes instalados
AI agents call npm_list to retrieve information from NPM MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves and displays information about installed packages in the project. It performs no side effects, creates no data, executes no scripts, modifies no files, and deletes nothing. This is a pure query operation with minimal risk even if misused by an AI agent—the worst outcome would be exposing dependency information.
From the tool's definition Tool description 'Listar paquetes instalados' (List installed packages) and name 'npm_list' indicate a read-only operation that queries and reports the current state of dependencies.
Attacks that exploit this kind of access
Listar paquetes instalados. It is categorised as a Read tool in the NPM MCP Server MCP Server, which means it retrieves data without modifying state.
Register the NPM MCP Server MCP server in PolicyLayer and add a rule for npm_list: 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 NPM MCP Server. Nothing to install.
npm_list 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 npm_list 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 npm_list. 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.
npm_list is provided by the NPM MCP Server MCP server (kpangaa/npm-mcp-server). 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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