Get range of members by lexicographical order. Args: key: The name of the key min_lex: Minimum value (inclusive) max_lex: Maximum value (inclusive) reverse: Return results in reverse order offset: Number of members to skip count: Maximum number of members to return Returns: List of members or err...
AI agents call sorted_set_range_by_lex to retrieve information from AWS without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves a range of members from a sorted set based on lexicographical ordering. It only reads data with no side effects, supporting pagination and ordering parameters but making no modifications.
From the tool's definition Get range of members by lexicographical order
Documented attack patterns abuse exactly the kind of access sorted_set_range_by_lex gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and AWS, and nothing reaches the server without passing your rules. This is the rule we recommend for sorted_set_range_by_lex:
{
"version": "1",
"default": "deny",
"tools": {
"sorted_set_range_by_lex": {}
}
}sorted_set_range_by_lex is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get range of members by lexicographical order. Args: key: The name of the key min_lex: Minimum value (inclusive) max_lex: Maximum value (inclusive) reverse: Return results in reverse order offset: Number of members to skip count: Maximum number of members to return Returns: List of members 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 sorted_set_range_by_lex: 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.
sorted_set_range_by_lex 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 sorted_set_range_by_lex 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 sorted_set_range_by_lex. 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.
sorted_set_range_by_lex 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.
Start from AWS, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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300 AWS tools catalogued and risk-classified — across an index of 43,000+ MCP servers.