string_set_range

Overwrite part of string. Args: key: The name of the key offset: Position to start overwriting value: String to write 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/string-set-range.md

WHAT IT DOES

What string_set_range does on AWS

AI agents use string_set_range 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 string_set_range is rated Medium

This tool writes or modifies data in a reversible manner. While 'overwrite' could seem destructive, it is modifying a string value rather than deleting the entire key or data structure. The operation is reversible through subsequent writes. However, without knowing the blast radius (whether this affects critical AWS configuration, secrets, or application data), severity is set to medium.

From the tool's definition Tool description states 'Overwrite part of string' with parameters for key, offset, and value. The operation modifies existing data (overwrite) but does not delete or irreversibly destroy it.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

string_set_range Rate-limited

string_set_range 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": {
    "string_set_range": {
      "limits": [
        {
          "counter": "string_set_range_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 string_set_range call is checked against it from then on.

FAQ

Questions about string_set_range

What does the string_set_range tool do? +

Overwrite part of string. Args: key: The name of the key offset: Position to start overwriting value: String to write 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 string_set_range? +

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

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

Can I rate-limit string_set_range? +

Yes. Add a rate_limit block to the string_set_range 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 string_set_range completely? +

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

string_set_range 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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