Search for entities by name, type, or observations
AI agents call search_nodes to retrieve information from Knowledge Graph MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a straightforward search/query operation that has no side effects. It does not create, modify, delete, or execute external operations. The search function is informational and read-only, making it the lowest risk category.
From the tool's definition The tool description states it 'Search[es] for entities by name, type, or observations'—it retrieves or queries data without modifying, creating, or deleting any information.
Attacks that exploit this kind of access
Search for entities by name, type, or observations. It is categorised as a Read tool in the Knowledge Graph MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Knowledge Graph MCP Server MCP server in PolicyLayer and add a rule for search_nodes: 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 Knowledge Graph MCP Server. Nothing to install.
search_nodes 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_nodes 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_nodes. 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_nodes is provided by the Knowledge Graph MCP Server MCP server (yuchoe/knowledge-graph-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
search_nodes is one line of Knowledge Graph MCP Server's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
Teams ship this data inside their own products. See what a licence covers →