json_nummultby

Multiply the number at path by value. Args: key: The name of the key path: The path in the JSON document value: The multiplier value (integer or float) Returns: New value or error message

SERVERAWS SOURCE@awslabs/mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity verified Pull the record →

This record as markdown: /tools/aws/json-nummultby.md

WHAT IT DOES

What json_nummultby does on AWS

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

RISK

Why json_nummultby is rated Medium

This tool modifies existing numeric data in a JSON document by multiplying it by a given value. It is a reversible in-place update (Write), but misuse could corrupt important data at scale — especially in an AWS context where it could affect configuration or financial figures stored in JSON.

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

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs json_nummultby safely

PolicyLayer is an MCP gateway: it sits between your AI agents and AWS, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For json_nummultby, this is the rule to start with:

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"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect AWS, apply this rule, and every json_nummultby call is checked against it from then on.

FAQ

Questions about json_nummultby

What does the json_nummultby tool do? +

Multiply the number at path by value. Args: key: The name of the key path: The path in the JSON document value: The multiplier value (integer or float) Returns: New value or error message. It is categorised as a Write tool in the AWS 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 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. 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 MCP server (@awslabs/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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