Search personal knowledge base by meaning. Returns memories ranked by semantic similarity to the query.
AI agents call search_brain to retrieve information from Open Brain MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs read-only semantic search over stored memories. It retrieves and ranks existing data by similarity without creating, modifying, or deleting any information. The operation has no side effects beyond returning query results. This is a classic Read operation with minimal risk even if misused by an agent—it cannot harm data integrity or cause financial/destructive consequences.
From the tool's definition Tool description states it 'Search[es] personal knowledge base by meaning' and 'Returns memories ranked by semantic similarity to the query.' The verb is search/retrieve with no modification or deletion capability mentioned.
Attacks that exploit this kind of access
Search personal knowledge base by meaning. Returns memories ranked by semantic similarity to the query. It is categorised as a Read tool in the Open Brain MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Open Brain MCP Server MCP server in PolicyLayer and add a rule for search_brain: 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 Open Brain MCP Server. Nothing to install.
search_brain 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_brain 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_brain. 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_brain is provided by the Open Brain MCP Server MCP server (subwizzll/mcp-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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