greet_user · AgentCore MCP Server MCP: Risk & Policy

WHAT IT DOES

What greet_user does on AgentCore MCP Server

AI agents use greet_user to create or update resources in AgentCore MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your AgentCore MCP Server environment.

WHY IT NEEDS A POLICY

Why greet_user needs a policy

An AI agent can call greet_user faster than any human can review — one bad instruction and it creates or modifies resources in AgentCore MCP Server by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

greet_user Rate-limited

greet_user stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "greet_user": {
      "limits": [
        {
          "counter": "greet_user_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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 greet_user

What does the greet_user tool do? +

Greet a user by name. It is categorised as a Write tool in the AgentCore MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on greet_user? +

Register the AgentCore MCP Server MCP server in PolicyLayer and add a rule for greet_user: 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 greet_user? +

greet_user is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit greet_user? +

Yes. Add a rate_limit block to the greet_user 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 greet_user completely? +

Set action: deny in the PolicyLayer policy for greet_user. 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 greet_user? +

greet_user 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.