Get statistics about the personal knowledge base: total memories, embedding coverage, breakdown by source.
AI agents call brain_stats 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 retrieves aggregate statistics from the knowledge base without creating, modifying, deleting, or executing any operations. It is purely informational and presents no risk of unintended consequences if called by an AI agent. The low severity reflects minimal blast radius—worst case is exposure of metadata counts about the user's knowledge base.
From the tool's definition Tool description states 'Get statistics about the personal knowledge base: total memories, embedding coverage, breakdown by source.' The verb 'Get' and focus on retrieving statistics indicate a read-only operation with no data modification or side effects.
Attacks that exploit this kind of access
Get statistics about the personal knowledge base: total memories, embedding coverage, breakdown by source. 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 brain_stats: 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.
brain_stats 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 brain_stats 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 brain_stats. 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.
brain_stats 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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