Count the number of set bits (1) in a range.
AI agents call bitmap_count to retrieve information from AWS IoT SiteWise MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The bitmap_count tool performs a read-only mathematical operation (counting set bits) on data within a specified range. It retrieves/analyzes data without creating, modifying, deleting, or executing arbitrary operations. This is a pure read operation with minimal blast radius if misused by an AI agent.
From the tool's definition Tool description states 'Count the number of set bits (1) in a range' — this is a computational query operation with no data modification, deletion, or external side effects.
Attacks that exploit this kind of access
Count the number of set bits (1) in a range. It is categorised as a Read tool in the AWS IoT SiteWise MCP Server MCP Server, which means it retrieves data without modifying state.
Register the AWS IoT SiteWise 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 AWS IoT SiteWise MCP Server. 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 AWS IoT SiteWise MCP Server MCP server (awslabs.aws-iot-sitewise-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.