AI agents call bitmap_count to retrieve information from Awslabs Amazon Sns Sqs without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs a read-only count operation on a bitmap range. It retrieves information (the count of set bits) without creating, modifying, deleting, or executing external operations. The severity is low because even if misused, it only returns a count value with no side effects or blast radius.
From the tool's definition Tool name is 'bitmap_count' and description states 'Count the number of set bits (1) in a range.' This is a pure computation/query operation that counts bits without modifying any data.
Documented attack patterns abuse exactly the kind of access bitmap_count gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Awslabs Amazon Sns Sqs, and nothing reaches the server without passing your rules. This is the rule we recommend for bitmap_count:
{
"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.
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Count the number of set bits (1) in a range. It is categorised as a Read tool in the Awslabs Amazon Sns Sqs MCP Server, which means it retrieves data without modifying state.
Register the Awslabs Amazon Sns Sqs 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 Awslabs Amazon Sns Sqs. Nothing to install.
bitmap_count is a Read tool with low risk. Read-only tools are generally safe to allow by default.
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.
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.
bitmap_count is provided by the Awslabs Amazon Sns Sqs MCP server (awslabs.amazon-sns-sqs-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Awslabs Amazon Sns Sqs, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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