bitmap_get

THE RISK

Low Risk

Why bitmap_get needs a policy

The tool performs a read-only query on a bitmap data structure, retrieving a single bit value at a specified offset. There is no modification, deletion, execution, or financial impact. The operation is a simple data retrieval with minimal blast radius.

From the tool's definition Tool description states 'Get the bit value at offset' with args for key and offset, and Returns 'Bit value or error message'. This is a retrieval operation with no side effects.

Documented attack patterns abuse exactly the kind of access bitmap_get gives an agent:

POLICY

How to control bitmap_get

PolicyLayer is an MCP gateway — it sits between your AI agents and AWS, and nothing reaches the server without passing your rules. This is the rule we recommend for bitmap_get:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "bitmap_get": {}
  }
}

bitmap_get is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register AWS — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

Roll out MCP under one policy → Per-person scoped tokens, one central policy, and full audit across every server your team connects.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about bitmap_get

What does the bitmap_get tool do? +

Get the bit value at offset. Args: key: The name of the bitmap key offset: The bit offset (0-based) Returns: Bit value or error message. It is categorised as a Read tool in the AWS MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on bitmap_get? +

Register the AWS MCP server in PolicyLayer and add a rule for bitmap_get: 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 bitmap_get? +

bitmap_get is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit bitmap_get? +

Yes. Add a rate_limit block to the bitmap_get 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_get completely? +

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

bitmap_get 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.

Enforce policy on every AWS tool call.

Start from AWS, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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