AI agents call retrieve_memory 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.
The tool retrieves or queries memory data with no side effects. While the description is empty, the clear naming pattern ('retrieve_memory') and context from sibling tools (record, update, delete for write/destructive operations; retrieve/get_recent_memories for read operations) establish this as a Read operation. Severity is low because data retrieval poses minimal risk even if misused by an AI agent.
From the tool's definition Tool name 'retrieve_memory' and parent server function (RAG memory store for MCP agents that enables retrieval of persistent memories).
Documented attack patterns abuse exactly the kind of access retrieve_memory 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_memory:
{
"version": "1",
"default": "deny",
"tools": {
"retrieve_memory": {}
}
}retrieve_memory is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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retrieve_memory. 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_memory: 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_memory 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_memory 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_memory. 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_memory 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.