AI agents call retrieve to retrieve information from Memory-Plus without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Despite the empty description, the tool name and the server's stated purpose of enabling 'retrieval of persistent memories' clearly indicate this tool queries or fetches stored data without modification or side effects. The presence of separate 'delete' and 'update' tools on the same server confirms this is a read-only operation.
From the tool's definition Tool name 'retrieve' combined with sibling tools 'retrieve_memory', 'get_recent_memories', and 'record' indicate this is a data retrieval operation. The server description emphasizes 'retrieval...of persistent memories' as a core function.
Documented attack patterns abuse exactly the kind of access retrieve gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Memory-Plus, and nothing reaches the server without passing your rules. This is the rule we recommend for retrieve:
{
"version": "1",
"default": "deny",
"tools": {
"retrieve": {}
}
}retrieve is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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retrieve. It is categorised as a Read tool in the Memory-Plus MCP Server, which means it retrieves data without modifying state.
Register the Memory-Plus MCP server in PolicyLayer and add a rule for retrieve: 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 Memory-Plus. Nothing to install.
retrieve is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the retrieve 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 retrieve. 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.
retrieve is provided by the Memory-Plus MCP server (yuchen20/memory-plus). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 14 Memory-Plus tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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14 Memory-Plus tools catalogued and risk-classified — across an index of 42,500+ MCP servers.