[DESTRUCTIVE] Creates a new 3CX user/extension. The Number must be unused — use find_users first to check availability. Returns the created user with its assigned Id. Requires confirmation from the user before executing.
AI agents use create_user to create or update resources in 3CX MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your 3CX MCP Server environment.
User creation is fundamentally a Write operation: it adds new data to the system in a reversible manner. The presence of a delete_user sibling tool confirms that create_user's effects can be undone. The [DESTRUCTIVE] tag appears to be a labeling error or refers to downstream consequences if a user is misconfigured, but the primary action is creating/modifying the user database.
From the tool's definition Tool description states 'Creates a new 3CX user/extension' which is a create/add operation. Despite the [DESTRUCTIVE] tag in the description, the actual operation is reversible—users can be deleted (evidenced by sibling tool delete_user).
Attacks that exploit this kind of access
[DESTRUCTIVE] Creates a new 3CX user/extension. The Number must be unused — use find_users first to check availability. Returns the created user with its assigned Id. Requires confirmation from the user before executing. It is categorised as a Write tool in the 3CX MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the 3CX MCP Server MCP server in PolicyLayer and add a rule for create_user: 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 3CX MCP Server. Nothing to install.
create_user is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_user 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 create_user. 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.
create_user is provided by the 3CX MCP Server MCP server (ssig-it/3cx-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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