json_nummultby · AWS API MCP Server MCP: Risk & Policy

WHAT IT DOES

What json_nummultby does on AWS API MCP Server

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

WHY IT NEEDS A POLICY

Why json_nummultby needs a policy

This tool modifies a numeric value at a specified path by multiplying it, which is a reversible data modification operation. It changes existing data in place but does not delete it, making it a Write operation. Severity is medium as misuse could corrupt numeric data in AWS resources.

From the tool's definition Multiply the number at path by value

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

json_nummultby Rate-limited

json_nummultby 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": {
    "json_nummultby": {
      "limits": [
        {
          "counter": "json_nummultby_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

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

FAQ

Questions about json_nummultby

What does the json_nummultby tool do? +

Multiply the number at path by value. It is categorised as a Write tool in the AWS API 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 json_nummultby? +

Register the AWS API MCP Server MCP server in PolicyLayer and add a rule for json_nummultby: 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 AWS API MCP Server. Nothing to install.

What risk level is json_nummultby? +

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

Can I rate-limit json_nummultby? +

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

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

json_nummultby is provided by the AWS API MCP Server MCP server (awslabs.aws-api-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.