Trim stream to specified length.
AI agents call stream_trim 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.
Trimming a stream removes/deletes older messages from the stream that exceed the specified length. This is an irreversible operation — once messages are trimmed, they cannot be recovered. This qualifies as Destructive since data is permanently removed.
From the tool's definition Trim stream to specified length
Attacks that exploit this kind of access
Trim stream to specified length. 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 stream_trim: 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.
stream_trim 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 stream_trim 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 stream_trim. 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.
stream_trim 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.