bitmap_set

Set the bit at offset to value. Args: key: The name of the bitmap key offset: The bit offset (0-based) value: The bit value (0 or 1) Returns: Success message or error message

SERVERAWS SOURCE@awslabs/mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity verified Pull the record →

This record as markdown: /tools/aws/bitmap-set.md

WHAT IT DOES

What bitmap_set does on AWS

AI agents use bitmap_set to create or update resources in AWS, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your AWS environment.

RISK

Why bitmap_set is rated Medium

This tool modifies data (sets a bit to 0 or 1) in a reversible manner—the bit can be flipped back to its previous state. It does not delete data irreversibly, execute arbitrary code, move money, or query for reads only. The blast radius is limited to the specific bitmap key and bit offset provided. Categorized as Write rather than Read (which would be bitmap_get) or Execute (no code execution or external triggers).

From the tool's definition Tool description explicitly states it "Set[s] the bit at offset to value," modifying data by changing a bit in a bitmap key. The return type indicates success or error, confirming a state-changing operation.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs bitmap_set 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_set, this is the rule to start with:

bitmap_set Rate-limited

bitmap_set stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "bitmap_set": {
      "limits": [
        {
          "counter": "bitmap_set_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect AWS, apply this rule, and every bitmap_set call is checked against it from then on.

FAQ

Questions about bitmap_set

What does the bitmap_set tool do? +

Set the bit at offset to value. Args: key: The name of the bitmap key offset: The bit offset (0-based) value: The bit value (0 or 1) Returns: Success message or error message. It is categorised as a Write tool in the AWS MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on bitmap_set? +

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

bitmap_set is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit bitmap_set? +

Yes. Add a rate_limit block to the bitmap_set 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_set completely? +

Set action: deny in the PolicyLayer policy for bitmap_set. 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_set? +

bitmap_set 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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