Roll back a synthesis run, reversing all applied proposals.
AI agents call memory_synthesis_rollback to permanently remove resources in Mementos — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Rolling back a synthesis run and reversing all applied proposals is an irreversible destructive action — it undoes previously committed changes to the memory system. While 'rollback' might sound reversible, it permanently discards the synthesis results and cannot be re-applied without re-running the synthesis.
From the tool's definition 'Roll back a synthesis run, reversing all applied proposals'
Attacks that exploit this kind of access
Roll back a synthesis run, reversing all applied proposals. It is categorised as a Destructive tool in the Mementos MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Mementos MCP server in PolicyLayer and add a rule for memory_synthesis_rollback: 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 Mementos. Nothing to install.
memory_synthesis_rollback 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_synthesis_rollback 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_synthesis_rollback. 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_synthesis_rollback is provided by the Mementos MCP server (@hasna/mementos). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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