Pop value(s) from left of list.
AI agents call list_pop_left to permanently remove resources in Amazon MQ MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
A 'pop' operation removes elements from a data structure, which is typically a destructive, irreversible operation. However, the description is minimal and the tool name/description is inconsistent with the server's stated purpose (Amazon MQ broker management), which lowers confidence.
From the tool's definition 'Pop value(s) from left of list' — popping removes/consumes data from the list irreversibly
Attacks that exploit this kind of access
Pop value(s) from left of list. It is categorised as a Destructive tool in the Amazon MQ MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Amazon MQ MCP Server MCP server in PolicyLayer and add a rule for list_pop_left: 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 Amazon MQ MCP Server. Nothing to install.
list_pop_left 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 list_pop_left 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 list_pop_left. 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.
list_pop_left is provided by the Amazon MQ MCP Server MCP server (awslabs.amazon-mq-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.