bitmap_set · Amazon MQ MCP Server MCP: Risk & Policy

WHAT IT DOES

What bitmap_set does on Amazon MQ MCP Server

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

WHY IT NEEDS A POLICY

Why bitmap_set needs a policy

The tool performs a write operation that modifies data at a specified offset. While the operation itself is reversible (a bit can be set back to its original value), it directly alters state. The severity is medium rather than high because the impact is limited to a single bit modification without apparent destructive consequences, though misuse could corrupt broker configuration or state data in Amazon MQ.

From the tool's definition Tool description: 'Set the bit at offset to value.' This operation modifies data by changing a specific bit in a bitmap structure.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bitmap_set Rate-limited

bitmap_set 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": {
    "bitmap_set": {
      "limits": [
        {
          "counter": "bitmap_set_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 Amazon MQ MCP Server, so you can run agents against it safely.

FAQ

Questions about bitmap_set

What does the bitmap_set tool do? +

Set the bit at offset to value. It is categorised as a Write tool in the Amazon MQ 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 bitmap_set? +

Register the Amazon MQ MCP Server MCP server in PolicyLayer and add a rule for bitmap_set: 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 Amazon MQ MCP Server. Nothing to install.

What risk level is bitmap_set? +

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

Can I rate-limit bitmap_set? +

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

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

bitmap_set is provided by the Amazon MQ MCP Server MCP server (awslabs.amazon-mq-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.