create_addon · Schematic MCP: Risk & Policy

WHAT IT DOES

What create_addon does on Schematic

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

WHY IT NEEDS A POLICY

Why create_addon needs a policy

This tool creates new add-on records, which is a reversible write operation. It modifies system state by adding new data but does not delete, execute arbitrary code, or move money. Severity is medium because misuse could create unwanted billing records, but the operation is reversible and doesn't directly impact financial transactions or destroy data.

From the tool's definition Tool name 'create_addon' and description 'Create a new add-on' indicate data creation operation. Context of sibling tools (create_company, create_plan, create_plan_with_billing) confirms this is a write operation in a billing/subscription management system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_addon Rate-limited

create_addon 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_addon": {
      "limits": [
        {
          "counter": "create_addon_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 Schematic, so you can run agents against it safely.

FAQ

Questions about create_addon

What does the create_addon tool do? +

Create a new add-on. It is categorised as a Write tool in the Schematic 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_addon? +

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

What risk level is create_addon? +

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

Can I rate-limit create_addon? +

Yes. Add a rate_limit block to the create_addon 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_addon completely? +

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

create_addon is provided by the Schematic MCP server (@schematichq/schematic-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.