discourse_create_user · Discourse MCP: Risk & Policy

WHAT IT DOES

What discourse_create_user does on Discourse MCP

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

WHY IT NEEDS A POLICY

Why discourse_create_user needs a policy

Creating a user account is a reversible write operation that adds a record to the system. While it has moderate blast radius (account hijacking, spam, abuse), it can be undone by deletion or account suspension. It does not delete, destroy data irreversibly, execute code, or move money, so it fits Write rather than more severe categories.

From the tool's definition Tool name is 'discourse_create_user' and description states 'Create a new user account in Discourse.' This is a creation operation that modifies the user database by adding a new account.

Risk signalsAdmin/system-level operation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

discourse_create_user Rate-limited

discourse_create_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": {
    "discourse_create_user": {
      "limits": [
        {
          "counter": "discourse_create_user_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about discourse_create_user

What does the discourse_create_user tool do? +

Create a new user account in Discourse. Requires admin API key and write permissions. It is categorised as a Write tool in the Discourse MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on discourse_create_user? +

Register the Discourse MCP server in PolicyLayer and add a rule for discourse_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 Discourse MCP. Nothing to install.

What risk level is discourse_create_user? +

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

Can I rate-limit discourse_create_user? +

Yes. Add a rate_limit block to the discourse_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.

How do I block discourse_create_user completely? +

Set action: deny in the PolicyLayer policy for discourse_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.

What MCP server provides discourse_create_user? +

discourse_create_user is provided by the Discourse MCP server (king-of-the-grackles/discourse-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.