create_action · Exponential MCP: Risk & Policy

WHAT IT DOES

What create_action does on Exponential MCP

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

WHY IT NEEDS A POLICY

Why create_action needs a policy

This tool creates new task/action records in the Exponential workspace. Creation is a Write operation as it modifies data in a reversible manner (created actions can be edited or deleted). The severity is low because creating tasks has minimal blast radius—it doesn't execute external code, delete data, move money, or cause irreversible harm.

From the tool's definition Tool name 'create_action' and description states 'Create a new action/task' - this is a create operation that adds new data reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_action Rate-limited

create_action 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_action": {
      "limits": [
        {
          "counter": "create_action_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 Exponential MCP, so you can run agents against it safely.

FAQ

Questions about create_action

What does the create_action tool do? +

Create a new action/task. Supports natural language with dates and project names. It is categorised as a Write tool in the Exponential MCP 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_action? +

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

What risk level is create_action? +

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

Can I rate-limit create_action? +

Yes. Add a rate_limit block to the create_action 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_action completely? +

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

create_action is provided by the Exponential MCP server (positonic/exponential-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.