AI agents call add to retrieve information from Node without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a stateless mathematical operation (addition) and returns a value. It does not read from or write to any external system, execute code in a privileged context, or cause any side effects. It is effectively a pure function, which maps closest to the Read category (query/compute with no side effects).
From the tool's definition "Adds two numbers together and returns the result" — pure arithmetic computation with no side effects, no data mutation, no external writes.
Attacks that exploit this kind of access
Adds two numbers together and returns the result. It is categorised as a Read tool in the Node MCP Server, which means it retrieves data without modifying state.
Register the Node MCP server in PolicyLayer and add a rule for add: 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 Node. Nothing to install.
add 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 add 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 add. 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.
add is provided by the Node MCP server (styles102/node-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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