AI agents call memory_delete_event to permanently remove resources in AWS AppSync MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
The 'delete' verb indicates an irreversible operation that removes data from memory/state. This falls under the Destructive category as deletions cannot be undone. Given it is part of an AWS AppSync server managing events, unauthorized deletion could cause significant data loss.
From the tool's definition Tool name 'memory_delete_event' contains 'delete' which indicates irreversible removal of data. Description is empty, but the verb 'delete' is explicit in the tool name.
Documented attack patterns abuse exactly the kind of access memory_delete_event gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and AWS AppSync MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for memory_delete_event:
{
"version": "1",
"default": "deny",
"hide": [
"memory_delete_event"
]
}memory_delete_event disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
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memory_delete_event. It is categorised as a Destructive tool in the AWS AppSync MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the AWS AppSync MCP Server MCP server in PolicyLayer and add a rule for memory_delete_event: 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 AppSync MCP Server. Nothing to install.
memory_delete_event is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the memory_delete_event 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 memory_delete_event. 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.
memory_delete_event is provided by the AWS AppSync MCP Server MCP server (awslabs.aws-appsync-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from AWS AppSync MCP Server, 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.
805 AWS AppSync MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.