create_message · Dust MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_message does on Dust MCP Server

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

WHY IT NEEDS A POLICY

Why create_message needs a policy

This tool creates and sends a message within a Dust conversation. It writes new data (a message) to the platform. While sending messages could trigger agent responses with broader effects, the core action is a reversible write operation. Severity is medium because misuse could result in unintended messages being sent to AI assistants or within workspaces, potentially causing confusion or unintended agent actions.

From the tool's definition Tool name 'create_message' and description 'Send a message' indicate creating/sending a new message

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_message Rate-limited

create_message 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_message": {
      "limits": [
        {
          "counter": "create_message_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

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

FAQ

Questions about create_message

What does the create_message tool do? +

Send a message. It is categorised as a Write tool in the Dust 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_message? +

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

What risk level is create_message? +

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

Can I rate-limit create_message? +

Yes. Add a rate_limit block to the create_message 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_message completely? +

Set action: deny in the PolicyLayer policy for create_message. 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_message? +

create_message is provided by the Dust MCP Server MCP server (ma3u/dust-mcp-server-postman-railway). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.