unassign_resource · Omniplan MCP: Risk & Policy

WHAT IT DOES

What unassign_resource does on Omniplan

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

WHY IT NEEDS A POLICY

Why unassign_resource needs a policy

Unassigning a resource from a task modifies project data by removing an assignment relationship. This is a reversible write operation — the resource can be reassigned. It does not delete the resource or task itself, so it does not qualify as Destructive.

From the tool's definition Remove a resource assignment from a task

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

unassign_resource Rate-limited

unassign_resource 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": {
    "unassign_resource": {
      "limits": [
        {
          "counter": "unassign_resource_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 Omniplan, so you can run agents against it safely.

FAQ

Questions about unassign_resource

What does the unassign_resource tool do? +

Remove a resource assignment from a task. It is categorised as a Write tool in the Omniplan MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on unassign_resource? +

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

What risk level is unassign_resource? +

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

Can I rate-limit unassign_resource? +

Yes. Add a rate_limit block to the unassign_resource 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 unassign_resource completely? +

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

unassign_resource is provided by the Omniplan MCP server (johntrandall/omniplan-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.