assign_resource · Omniplan MCP: Risk & Policy

WHAT IT DOES

What assign_resource does on Omniplan

AI agents use assign_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 assign_resource needs a policy

Based on naming convention and server context, 'assign_resource' most likely creates or modifies resource assignments within a project (reversible operation). This is a Write action—it changes project state but does not irreversibly delete data or execute arbitrary code. Severity is medium because misuse could disrupt project planning and resource allocation, but changes can typically be undone.

From the tool's definition Tool name 'assign_resource' in an OmniPlan project management context. No description provided. Context sibling tools include create_resource, delete_resource, create_task, add_dependency, suggesting CRUD operations on project entities.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

assign_resource Rate-limited

assign_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": {
    "assign_resource": {
      "limits": [
        {
          "counter": "assign_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 assign_resource

What does the assign_resource tool do? +

assign_resource. 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 assign_resource? +

Register the Omniplan MCP server in PolicyLayer and add a rule for assign_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 assign_resource? +

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

Can I rate-limit assign_resource? +

Yes. Add a rate_limit block to the assign_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 assign_resource completely? +

Set action: deny in the PolicyLayer policy for assign_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 assign_resource? +

assign_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.