This record as markdown: /tools/io-github-dave-london-npm/bundle-install.md
What bundle-install does on Npm
AI agents invoke bundle-install 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 bundle-install is rated High
Installing dependencies via a package manager executes code and system-level operations, downloads arbitrary third-party packages, and modifies the local environment. This goes beyond a simple write — it triggers execution of install scripts and external processes. The description is truncated but the tool name and partial description clearly indicate running 'bundle install'.
From the tool's definition 'Installs Gemfile dependencies' — runs a package manager command (bundle install) that executes external processes and downloads/installs third-party code onto the system
Attacks that exploit this kind of access
The rule that runs bundle-install 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 bundle-install, this is the rule to start with:
bundle-install 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 bundle-install call is checked against it from then on.
Questions about bundle-install
Installs Gemfile dependencies using. 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 bundle-install: 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.
bundle-install 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 bundle-install 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 bundle-install. 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.
bundle-install 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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