AI agents call get_health_status to retrieve information from Npm Dev without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves health/status information about the MCP server—a read-only operation with no side effects. It does not create, modify, delete, execute code, or move money. The low severity reflects minimal risk even if misused by an agent, as it only returns diagnostic information.
From the tool's definition Tool name 'get_health_status' and description 'MCPサーバーのヘルス状態を取得' (Get MCP server health status) indicate a query operation that retrieves status information without modifying or executing anything.
Attacks that exploit this kind of access
MCPサーバーのヘルス状態を取得. It is categorised as a Read tool in the Npm Dev MCP Server, which means it retrieves data without modifying state.
Register the Npm Dev MCP server in PolicyLayer and add a rule for get_health_status: 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 Dev. Nothing to install.
get_health_status 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_health_status 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_health_status. 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_health_status is provided by the Npm Dev MCP server (masamunet/npm-dev-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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