Add member-score pairs to sorted set. Args: key: The name of the key mapping: Dictionary of member-score pairs Returns: Success message or error message
AI agents use sorted_set_add 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.
This tool adds or modifies entries in a sorted set, which is a data modification operation. It qualifies as Write because it creates or modifies data reversibly—members can be removed, updated, or the set cleared later. The severity is medium because misuse by an AI agent could pollute or alter data structures, but the impact is limited to a single key and is reversible.
From the tool's definition Tool name 'sorted_set_add' and description 'Add member-score pairs to sorted set' clearly indicate creation/modification of data in a sorted set data structure. The operation is reversible (members can be removed or updated).
Documented attack patterns abuse exactly the kind of access sorted_set_add 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_add:
{
"version": "1",
"default": "deny",
"tools": {
"sorted_set_add": {
"limits": [
{
"counter": "sorted_set_add_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}sorted_set_add 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.
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Add member-score pairs to sorted set. Args: key: The name of the key mapping: Dictionary of member-score pairs 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.
Register the AWS MCP server in PolicyLayer and add a rule for sorted_set_add: 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_add is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the sorted_set_add 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_add. 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_add 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.
Free to start. No card required.
300 AWS tools catalogued and risk-classified — across an index of 43,000+ MCP servers.