create_task · Nubis MCP: Risk & Policy

WHAT IT DOES

What create_task does on Nubis

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

WHY IT NEEDS A POLICY

Why create_task needs a policy

This tool creates new data (tasks) in the workspace, which is reversible (tasks can be deleted or modified later). It does not execute code, delete data irreversibly, or move money. The severity is medium because creating many unwanted tasks could clutter the workspace and require cleanup, but the impact is limited to task management metadata within a single workspace.

From the tool's definition Tool description explicitly states 'Create a new task' and specifies optional parameters like 'parent_task_id' for subtasks and GitHub file linking. The word 'Create' is the primary indicator of a write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_task Rate-limited

create_task 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_task": {
      "limits": [
        {
          "counter": "create_task_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 Nubis, so you can run agents against it safely.

FAQ

Questions about create_task

What does the create_task tool do? +

Create a new task or subtask in the workspace. Tasks are created in inbox by default. Link to GitHub files/directories to associate code with tasks. Use parent_task_id to create subtasks under a parent task. It is categorised as a Write tool in the Nubis 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_task? +

Register the Nubis MCP server in PolicyLayer and add a rule for create_task: 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 Nubis. Nothing to install.

What risk level is create_task? +

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

Can I rate-limit create_task? +

Yes. Add a rate_limit block to the create_task 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_task completely? +

Set action: deny in the PolicyLayer policy for create_task. 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_task? +

create_task is provided by the Nubis MCP server (@lil2good/nubis-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.