Elimina físicamente todas las memorias cuya fecha de expiración (expires_at) ya ha pasado.
AI agents call purge_expired to permanently remove resources in Engram — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool permanently and irreversibly deletes data (expired memories) from the SQLite database. Even though the deletion targets only expired records (a logical constraint), the operation itself is destructive because: (1) it removes data that cannot be recovered without external backups, (2) it operates at scale ('todas las memorias' = all memories matching the condition), and (3) purge operations are inherently…
From the tool's definition 'Elimina físicamente todas las memorias' (Physically eliminates all memories) — the verb 'elimina' (eliminates/deletes) combined with 'físicamente' (physically) and the scope 'todas' (all) matching a condition indicates irreversible deletion.
Attacks that exploit this kind of access
Elimina físicamente todas las memorias cuya fecha de expiración (expires_at) ya ha pasado. It is categorised as a Destructive tool in the Engram MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Engram MCP server in PolicyLayer and add a rule for purge_expired: 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 Engram. Nothing to install.
purge_expired 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 purge_expired 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 purge_expired. 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.
purge_expired is provided by the Engram MCP server (jacksini/engram-mcp). 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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