Search session notes with filters and relevance ranking.
AI agents call search_notes to retrieve information from Second 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 and searches existing data without creating, modifying, or deleting anything. It has no side effects beyond returning information to the user. The blast radius of misuse is minimal — an agent could retrieve notes it shouldn't access, but this is primarily an information disclosure risk rather than a destructive or system-altering one. Classified as Read with low severity.
From the tool's definition Tool performs search and filtering operations on notes. The description explicitly states "Search session notes with filters and relevance ranking" — a query and retrieval operation with no modification or deletion of data.
Attacks that exploit this kind of access
Search session notes with filters and relevance ranking. It is categorised as a Read tool in the Second Brain MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Second Brain MCP Server MCP server in PolicyLayer and add a rule for search_notes: 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 Second Brain MCP Server. Nothing to install.
search_notes 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_notes 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_notes. 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_notes is provided by the Second Brain MCP Server MCP server (vocoufi/second-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.
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