This record as markdown: /tools/io-github-dave-london-npm/nvm.md
What nvm does on Npm
AI agents invoke nvm to trigger actions in Npm. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.
Why nvm is rated High
Managing Node.js versions via nvm involves executing shell-level operations such as installing new Node.js versions, switching the active runtime, and modifying environment configuration. This constitutes external process execution and system-level changes. Misuse could install malicious or incompatible Node.js versions affecting all downstream operations, hence high severity.
From the tool's definition 'Manages Node.js versions via nvm' - nvm is a version manager that installs, switches, and configures Node.js runtime environments
Attacks that exploit this kind of access
The rule that runs nvm safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Npm, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For nvm, this is the rule to start with:
nvm stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Npm, apply this rule, and every nvm call is checked against it from then on.
Questions about nvm
Manages Node.js versions via nvm. It is categorised as a Execute tool in the Npm MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Npm MCP server in PolicyLayer and add a rule for nvm: 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. Nothing to install.
nvm is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the nvm 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 nvm. 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.
nvm is provided by the Npm MCP server (Dave-London/Pare). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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