Возвращает список категорий доступных узлов n8n.
AI agents call list_node_categories to retrieve information from n8n MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns metadata about available node categories in n8n. It performs no creation, modification, deletion, or execution of workflows or other resources. It is a purely informational read operation with minimal blast radius if misused by an AI agent.
From the tool's definition Tool name 'list_node_categories' and description 'Возвращает список категорий доступных узлов n8n' (Returns a list of available n8n node categories) indicate a retrieval operation with no side effects.
Attacks that exploit this kind of access
Возвращает список категорий доступных узлов n8n. It is categorised as a Read tool in the n8n MCP Server MCP Server, which means it retrieves data without modifying state.
Register the n8n MCP Server MCP server in PolicyLayer and add a rule for list_node_categories: 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 n8n MCP Server. Nothing to install.
list_node_categories 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 list_node_categories 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 list_node_categories. 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.
list_node_categories is provided by the n8n MCP Server MCP server (ospray-creator/n8n-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
list_node_categories is one line of n8n 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.
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