add_numbers · AgentCore MCP Server MCP: Risk & Policy

WHAT IT DOES

What add_numbers does on AgentCore MCP Server

AI agents invoke add_numbers to trigger actions in AgentCore MCP Server. 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 IT NEEDS A POLICY

Why add_numbers needs a policy

This tool performs arithmetic computation. It doesn't purely retrieve stored data (Read), nor does it write/modify persistent state. It executes a calculation. However, it is a pure mathematical function with no side effects, making it very low risk. Confidence is moderate because the description is minimal and doesn't clarify whether this triggers any external operation or is purely in-memory computation.

From the tool's definition 'Add two numbers together' — performs a computation/operation on inputs

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_numbers Rate-limited

add_numbers 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "add_numbers": {
      "limits": [
        {
          "counter": "add_numbers_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches AgentCore MCP Server, so you can run agents against it safely.

FAQ

Questions about add_numbers

What does the add_numbers tool do? +

Add two numbers together. It is categorised as a Execute tool in the AgentCore MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on add_numbers? +

Register the AgentCore MCP Server MCP server in PolicyLayer and add a rule for add_numbers: 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 AgentCore MCP Server. Nothing to install.

What risk level is add_numbers? +

add_numbers is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit add_numbers? +

Yes. Add a rate_limit block to the add_numbers 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.

How do I block add_numbers completely? +

Set action: deny in the PolicyLayer policy for add_numbers. 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.

What MCP server provides add_numbers? +

add_numbers is provided by the AgentCore MCP Server MCP server (steveradich/template-aws-agentcore-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.