json_arrtrim | PolicyLayer

WHAT IT DOES

What json_arrtrim does on AWS Labs Amazon Q Business anonymous mode MCP Server

AI agents use json_arrtrim to create or update resources in AWS Labs Amazon Q Business anonymous mode MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your AWS Labs Amazon Q Business anonymous mode MCP Server environment.

WHY IT NEEDS A POLICY

Why json_arrtrim needs a policy

Trimming an array modifies the data by removing elements outside the specified range. This is a reversible write/modification operation on data at a given path, not a full destructive delete but a partial in-place modification. Severity is medium as it can result in data loss if misused but is scoped to a specific array path.

From the tool's definition Trim array at path to include only elements within range

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

json_arrtrim Rate-limited

json_arrtrim 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_arrtrim": {
      "limits": [
        {
          "counter": "json_arrtrim_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 AWS Labs Amazon Q Business anonymous mode MCP Server, so you can run agents against it safely.

FAQ

Questions about json_arrtrim

What does the json_arrtrim tool do? +

Trim array at path to include only elements within range. It is categorised as a Write tool in the AWS Labs Amazon Q Business anonymous mode 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_arrtrim? +

Register the AWS Labs Amazon Q Business anonymous mode MCP Server MCP server in PolicyLayer and add a rule for json_arrtrim: 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 Labs Amazon Q Business anonymous mode MCP Server. Nothing to install.

What risk level is json_arrtrim? +

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

Can I rate-limit json_arrtrim? +

Yes. Add a rate_limit block to the json_arrtrim 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_arrtrim completely? +

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

json_arrtrim is provided by the AWS Labs Amazon Q Business anonymous mode MCP Server MCP server (awslabs.amazon-qbusiness-anonymous-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.