create_chat_user · Sendbird MCP: Risk & Policy

WHAT IT DOES

What create_chat_user does on Sendbird

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

WHY IT NEEDS A POLICY

Why create_chat_user needs a policy

This tool creates new data (user account and access token) in a reversible manner. It does not delete, destroy, or execute arbitrary code. While it has security implications (issuing auth tokens), the action is Write-category as it creates new entities.

From the tool's definition Tool description states it will 'Provision a new chat user ID and profile' and 'Returns the user_id and an access_token', indicating creation of new user records and authentication credentials.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_chat_user Rate-limited

create_chat_user 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": {
    "create_chat_user": {
      "limits": [
        {
          "counter": "create_chat_user_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Sendbird, so you can run agents against it safely.

FAQ

Questions about create_chat_user

What does the create_chat_user tool do? +

Provision a new chat user ID and profile in the Sendbird application. Returns the user_id and an access_token for client SDK auth. It is categorised as a Write tool in the Sendbird MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_chat_user? +

Register the Sendbird MCP server in PolicyLayer and add a rule for create_chat_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 Sendbird. Nothing to install.

What risk level is create_chat_user? +

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

Can I rate-limit create_chat_user? +

Yes. Add a rate_limit block to the create_chat_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.

How do I block create_chat_user completely? +

Set action: deny in the PolicyLayer policy for create_chat_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.

What MCP server provides create_chat_user? +

create_chat_user is provided by the Sendbird MCP server (nobanks/sendbird-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.