Get bundle size information from bundlephobia
AI agents call get_package_size to retrieve information from NPM Context Agent MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries external service (bundlephobia) to fetch read-only metrics about npm package bundle sizes. It has no side effects, cannot modify data, execute code, or trigger external operations. Consistent with sibling tools (get_package_info, get_package_versions, get_readme_data) that all perform information retrieval.
From the tool's definition Tool retrieves bundle size information from bundlephobia; no modification, deletion, or execution capabilities. The verb 'get' and context of 'information' indicate data retrieval only.
Attacks that exploit this kind of access
Get bundle size information from bundlephobia. It is categorised as a Read tool in the NPM Context Agent MCP MCP Server, which means it retrieves data without modifying state.
Register the NPM Context Agent MCP server in PolicyLayer and add a rule for get_package_size: 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 Context Agent MCP. Nothing to install.
get_package_size 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 get_package_size 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 get_package_size. 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.
get_package_size is provided by the NPM Context Agent MCP server (juansebastiangb/npm-context-agent-mcp). 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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