AI agents call n8n_list_users to retrieve information from Mcp N8n without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves/queries user information without modifying, deleting, or executing anything. It is a Read operation. Severity is medium rather than low because exposing the full user list could enable account enumeration, reconnaissance for privilege escalation, or targeting attacks, though the 'admin only' restriction suggests built-in access control.
From the tool's definition Tool name is 'n8n_list_users' and description states 'List all users (admin only)' — the verb 'list' indicates a retrieval operation with no side effects. The data retrieved (user list) is sensitive in a workflow automation context.
Risk signalsBulk/mass operation — affects multiple targets · Admin/system-level operation
Attacks that exploit this kind of access
List all users (admin only). It is categorised as a Read tool in the Mcp N8n MCP Server, which means it retrieves data without modifying state.
Register the Mcp N8n MCP server in PolicyLayer and add a rule for n8n_list_users: 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 Mcp N8n. Nothing to install.
n8n_list_users 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 n8n_list_users 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 n8n_list_users. 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.
n8n_list_users is provided by the Mcp N8n MCP server (lyzetam/mcp-n8n). 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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