create_mattermost_direct_channel · Mattermost MCP Server MCP

WHAT IT DOES

What create_mattermost_direct_channel does on Mattermost MCP Server

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

WHY IT NEEDS A POLICY

Why create_mattermost_direct_channel needs a policy

Creating a direct channel is a reversible Write operation that modifies workspace state by establishing a new communication channel between users. While not destructive, it creates a persistent artifact. Severity is medium because an AI agent creating unwanted direct channels could enable spam, social engineering, or harassment, though the effect is limited in scope compared to broader workspace disruption.

From the tool's definition Tool name 'create_mattermost_direct_channel' indicates creation of a direct messaging channel. Server description states it 'enables interaction with Mattermost workspaces to manage channels, messages, threads, and user profiles' and provides tools for…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_mattermost_direct_channel Rate-limited

create_mattermost_direct_channel 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_mattermost_direct_channel": {
      "limits": [
        {
          "counter": "create_mattermost_direct_channel_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 Mattermost MCP Server, so you can run agents against it safely.

FAQ

Questions about create_mattermost_direct_channel

What does the create_mattermost_direct_channel tool do? +

create_mattermost_direct_channel. It is categorised as a Write tool in the Mattermost MCP Server 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_mattermost_direct_channel? +

Register the Mattermost MCP Server MCP server in PolicyLayer and add a rule for create_mattermost_direct_channel: 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 Mattermost MCP Server. Nothing to install.

What risk level is create_mattermost_direct_channel? +

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

Can I rate-limit create_mattermost_direct_channel? +

Yes. Add a rate_limit block to the create_mattermost_direct_channel 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_mattermost_direct_channel completely? +

Set action: deny in the PolicyLayer policy for create_mattermost_direct_channel. 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_mattermost_direct_channel? +

create_mattermost_direct_channel is provided by the Mattermost MCP Server MCP server (vnikhilbuddhavarapu/mattermost-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.