update_client

Update an existing client's traffic limit, expiry, or enabled state. Only the fields you pass are changed; everything else on the client is preserved.

SERVER3xui SOURCE3xui-mcp

Medium RISK CLASS

Category Write

Parameters 72 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/3xui-mcp/update-client.md

WHAT IT DOES

What update_client does on 3xui

AI agents use update_client to create or update resources in 3xui, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your 3xui environment.

Parameter	Type	Required	Description
`enable`	boolean	—	Enable or disable the client
`limitIp`	integer	—	New max simultaneous IPs (0 = unlimited)
`totalGB`	number	—	New data limit in GB (0 = unlimited)
`clientId`	string	Yes	Client UUID (VLESS/VMess) or password (Trojan/Shadowsocks) — see get_client
`inboundId`	integer	Yes	Numeric ID of the inbound the client belongs to
`expiryDays`	integer	—	Alternative to expiryTime: set expiry to N days from now
`expiryTime`	integer	—	New expiry as a Unix ms timestamp (0 = never)

Parameters from the server's own tool schema.

RISK

Why update_client is rated Medium

An AI agent can call update_client faster than any human can review: one bad instruction and it creates or modifies resources in 3xui by the hundred, each call as confident as the last.

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs update_client safely

PolicyLayer is an MCP gateway: it sits between your AI agents and 3xui, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For update_client, this is the rule to start with:

update_client Rate-limited

update_client stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "update_client": {
      "limits": [
        {
          "counter": "update_client_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect 3xui, apply this rule, and every update_client call is checked against it from then on.

FAQ

Questions about update_client

What does the update_client tool do? +

Update an existing client's traffic limit, expiry, or enabled state. Only the fields you pass are changed; everything else on the client is preserved. It is categorised as a Write tool in the 3xui MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does update_client accept? +

update_client accepts 7 parameters: enable, limitIp, totalGB, clientId, inboundId, expiryDays, expiryTime. Required: clientId, inboundId. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on update_client? +

Register the 3xui MCP server in PolicyLayer and add a rule for update_client: 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 3xui. Nothing to install.

What risk level is update_client? +

update_client is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit update_client? +

Yes. Add a rate_limit block to the update_client 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.

How do I block update_client completely? +

Set action: deny in the PolicyLayer policy for update_client. 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.

What MCP server provides update_client? +

update_client is provided by the 3xui MCP server (3xui-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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