AI agents call add to retrieve information from MCP Guide without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a pure arithmetic addition operation and returns the result. It has no side effects, does not modify any data, and cannot cause harm. It is essentially a read/compute operation with minimal risk.
From the tool's definition Сложить два числа и вернуть результат — 'add two numbers and return the result'
Documented attack patterns abuse exactly the kind of access add gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Guide, and nothing reaches the server without passing your rules. This is the rule we recommend for add:
{
"version": "1",
"default": "deny",
"tools": {
"add": {}
}
}add is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Сложить два числа и вернуть результат. It is categorised as a Read tool in the MCP Guide MCP Server, which means it retrieves data without modifying state.
Register the MCP Guide 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 MCP Guide. 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 MCP Guide MCP server (switchblxdee/mcp_guide). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP Guide, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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4 MCP Guide tools catalogued and risk-classified — across an index of 43,000+ MCP servers.