Identify and remove low-value memories to optimize storage and improve retrieval relevance.
AI agents call prune_memories to permanently remove resources in ThoughtMCP — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool performs an irreversible deletion operation on stored data (memories). Although the deletion targets 'low-value' items (implying some filtering logic), the tool fundamentally removes data that cannot be undone. This places it in the Destructive category rather than Write, as Write operations are reversible.
From the tool's definition The tool description states it will 'remove low-value memories,' and the name 'prune_memories' explicitly indicates deletion of memory entries.
Attacks that exploit this kind of access
Identify and remove low-value memories to optimize storage and improve retrieval relevance. It is categorised as a Destructive tool in the ThoughtMCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Thought MCP server in PolicyLayer and add a rule for prune_memories: 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 ThoughtMCP. Nothing to install.
prune_memories 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 prune_memories 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 prune_memories. 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.
prune_memories is provided by the Thought MCP server (keyurgolani/thoughtmcp). 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.
Teams ship this data inside their own products. See what a licence covers →