Search your personal memory (journal, decisions, facts, gratitudes) using semantic similarity. Returns the most relevant entries with type, date, and excerpt.
AI agents call search_memory to retrieve information from Personal Brain without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries personal data without side effects. It has no ability to create, modify, delete, or execute operations. The worst-case misuse is over-exposure of sensitive personal information already in the database, but the tool itself cannot amplify harm beyond read access. Severity is low because the blast radius is limited to information disclosure of data the user voluntarily stored.
From the tool's definition Tool performs semantic search and returns matching entries with metadata (type, date, excerpt). Description explicitly states it 'Search[es] your personal memory' and 'Returns the most relevant entries' — pure retrieval with no modification, deletion, or…
Attacks that exploit this kind of access
Search your personal memory (journal, decisions, facts, gratitudes) using semantic similarity. Returns the most relevant entries with type, date, and excerpt. It is categorised as a Read tool in the Personal Brain MCP Server, which means it retrieves data without modifying state.
Register the Personal Brain MCP server in PolicyLayer and add a rule for search_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 Personal Brain. Nothing to install.
search_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 search_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 search_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.
search_memory is provided by the Personal Brain MCP server (phantomts/personal-brain-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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