cache_decr | PolicyLayer

WHAT IT DOES

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

AI agents use cache_decr 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 cache_decr needs a policy

Decrementing a counter modifies existing data in the cache (a reversible write operation). It changes a numeric value but does not irreversibly delete data. Misuse could corrupt application state or counters, hence medium severity.

From the tool's definition Decrement a counter in the cache

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

cache_decr Rate-limited

cache_decr 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": {
    "cache_decr": {
      "limits": [
        {
          "counter": "cache_decr_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 cache_decr

What does the cache_decr tool do? +

Decrement a counter in the cache. 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 cache_decr? +

Register the AWS Labs Amazon Q Business anonymous mode MCP Server MCP server in PolicyLayer and add a rule for cache_decr: 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 cache_decr? +

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

Can I rate-limit cache_decr? +

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

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

cache_decr 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.