Set an expiration time for a Redis key. Args: name: The Redis key. expire_seconds: Time in seconds after which the key should expire. Returns: A success message or an error message.
AI agents use expire 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 modifies Redis key TTL (time-to-live) metadata, which is a reversible write operation. It does not delete data immediately, but rather schedules automatic expiration. An AI misusing this could inadvertently expire critical cache entries, breaking application functionality or causing data loss after expiration.
From the tool's definition Tool sets an expiration time for a Redis key, modifying key metadata. Description states it configures expiration behavior: 'Set an expiration time for a Redis key' with arguments for the key name and expire_seconds duration.
Documented attack patterns abuse exactly the kind of access expire 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 expire:
{
"version": "1",
"default": "deny",
"tools": {
"expire": {
"limits": [
{
"counter": "expire_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}expire 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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Set an expiration time for a Redis key. Args: name: The Redis key. expire_seconds: Time in seconds after which the key should expire. Returns: A success message or an 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 expire: 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.
expire 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 expire 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 expire. 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.
expire 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.