bitmap_count

THE RISK

Low Risk

Why bitmap_count needs a policy

This tool retrieves and analyzes data (counting set bits) without any side effects, creation, modification, or deletion of data. It is a pure computational query with no state changes or external action triggers. Despite being on an AWS ECS server, this particular tool is a simple bitwise utility function classified as Read category with low severity risk.

From the tool's definition Tool name 'bitmap_count' and description 'Count the number of set bits (1) in a range' indicate a read-only operation that performs a computation on data without modifying, deleting, or executing external operations.

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

POLICY

How to control bitmap_count

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

policy.json

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

bitmap_count 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 Amazon ECS MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

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_count

What does the bitmap_count tool do? +

Count the number of set bits (1) in a range. It is categorised as a Read tool in the Amazon ECS MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on bitmap_count? +

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

What risk level is bitmap_count? +

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

Can I rate-limit bitmap_count? +

Yes. Add a rate_limit block to the bitmap_count 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_count completely? +

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

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

Enforce policy on every Amazon ECS MCP Server tool call.

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

CHECK YOUR STACK →