Search through stored memories using semantic similarity
AI agents call memory_search to retrieve information from MCP Memory Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves stored memory data based on semantic similarity. It exhibits classic Read characteristics: it fetches or queries data without side effects. There is no capability to modify, delete, or execute operations. The blast radius of misuse is minimal — an agent could retrieve sensitive conversation history, but cannot alter or destroy it.
From the tool's definition Tool performs 'Search through stored memories using semantic similarity' — a retrieval-only operation with no modification, deletion, or execution of external commands.
Attacks that exploit this kind of access
Search through stored memories using semantic similarity. It is categorised as a Read tool in the MCP Memory Server MCP Server, which means it retrieves data without modifying state.
Register the MCP Memory Server MCP server in PolicyLayer and add a rule for memory_search: 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 MCP Memory Server. Nothing to install.
memory_search 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 memory_search 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 memory_search. 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.
memory_search is provided by the MCP Memory Server MCP server (plumycat/mcp-memory-server). 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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