キーワードで過去の記憶を検索する。
AI agents call recall_memory to retrieve information from Memory Engine without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool searches or queries stored memory data based on keywords, returning results without creating, modifying, deleting, or executing external operations. It is a read-only retrieval function. The low severity reflects minimal blast radius—an agent querying memories cannot directly harm external systems, though the information retrieved could inform downstream decisions.
From the tool's definition Tool name 'recall_memory' and description 'キーワードで過去の記憶を検索する' (search past memories by keyword) indicate a retrieval/query operation. The Japanese description explicitly describes searching/retrieving stored memories without modification.
Attacks that exploit this kind of access
キーワードで過去の記憶を検索する。. It is categorised as a Read tool in the Memory Engine MCP Server, which means it retrieves data without modifying state.
Register the Memory Engine MCP server in PolicyLayer and add a rule for recall_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 Engine. Nothing to install.
recall_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 recall_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 recall_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.
recall_memory is provided by the Memory Engine MCP server (kagioneko/memory-engine-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
recall_memory is one line of Memory Engine's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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