bitmap_pos
Find positions of bits set to a specific value. Args: key: The name of the bitmap key bit: Bit value to search for (0 or 1) start: Start offset (inclusive, optional) end: End offset (inclusive, optional) count: Maximum number of positions to return (optional) Returns: List of positions or error m...
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What bitmap_pos does on AWS
AI agents call bitmap_pos to retrieve information from AWS without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why bitmap_pos is rated Low
This tool reads/queries a bitmap data structure and returns matching bit positions. It has no side effects, does not modify any data, and only retrieves information.
From the tool's definition Find positions of bits set to a specific value... Returns: List of positions or error message
Attacks that exploit this kind of access
The rule that runs bitmap_pos safely
PolicyLayer is an MCP gateway: it sits between your AI agents and AWS, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For bitmap_pos, this is the rule to start with:
bitmap_pos is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect AWS, apply this rule, and every bitmap_pos call is checked against it from then on.
Questions about bitmap_pos
Find positions of bits set to a specific value. Args: key: The name of the bitmap key bit: Bit value to search for (0 or 1) start: Start offset (inclusive, optional) end: End offset (inclusive, optional) count: Maximum number of positions to return (optional) Returns: List of positions or error message. It is categorised as a Read tool in the AWS MCP Server, which means it retrieves data without modifying state.
Register the AWS MCP server in PolicyLayer and add a rule for bitmap_pos: 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.
bitmap_pos 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_pos 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_pos. 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_pos 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.
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