nexus_create_task · NexusToken MCP: Risk & Policy

WHAT IT DOES

What nexus_create_task does on NexusToken

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

WHY IT NEEDS A POLICY

Why nexus_create_task needs a policy

This tool creates/delegates a new task on the NexusToken network, which is a Write operation (creating a new resource). It does not appear to execute arbitrary code, delete data, or move money. Severity is medium because submitting tasks to an external network could have unintended side effects or resource costs, but the action itself is reversible or at least not inherently destructive.

From the tool's definition Delegate a JSON extraction task to the NexusToken network

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

nexus_create_task Rate-limited

nexus_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": {
    "nexus_create_task": {
      "limits": [
        {
          "counter": "nexus_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 NexusToken, so you can run agents against it safely.

FAQ

Questions about nexus_create_task

What does the nexus_create_task tool do? +

Delegate a JSON extraction task to the NexusToken network. It is categorised as a Write tool in the NexusToken MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on nexus_create_task? +

Register the NexusToken MCP server in PolicyLayer and add a rule for nexus_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 NexusToken. Nothing to install.

What risk level is nexus_create_task? +

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

Can I rate-limit nexus_create_task? +

Yes. Add a rate_limit block to the nexus_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 nexus_create_task completely? +

Set action: deny in the PolicyLayer policy for nexus_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 nexus_create_task? +

nexus_create_task is provided by the NexusToken MCP server (bobuilds/nexustoken-sdk). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.