orion_create_subscription · Fiware Orion MCP: Risk & Policy

WHAT IT DOES

What orion_create_subscription does on Fiware Orion

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

WHY IT NEEDS A POLICY

Why orion_create_subscription needs a policy

This tool creates a new subscription, which is a reversible write operation—subscriptions can be modified or deleted later. It does not delete data or execute arbitrary code, so it is not Destructive or Execute. The severity is medium because misconfigured subscriptions could trigger unintended notification storms or expose sensitive context data through callbacks, but the effect is bounded and reversible.

From the tool's definition Tool name 'orion_create_subscription' indicates creation of a new subscription resource. Within FIWARE Orion Context Broker, subscriptions define notifications and triggers for context changes; creating one adds a persistent configuration that modifies broker…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

orion_create_subscription Rate-limited

orion_create_subscription 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": {
    "orion_create_subscription": {
      "limits": [
        {
          "counter": "orion_create_subscription_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 Fiware Orion, so you can run agents against it safely.

FAQ

Questions about orion_create_subscription

What does the orion_create_subscription tool do? +

orion_create_subscription. It is categorised as a Write tool in the Fiware Orion MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on orion_create_subscription? +

Register the Fiware Orion MCP server in PolicyLayer and add a rule for orion_create_subscription: 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 Fiware Orion. Nothing to install.

What risk level is orion_create_subscription? +

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

Can I rate-limit orion_create_subscription? +

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

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

orion_create_subscription is provided by the Fiware Orion MCP server (k2iser/fiware-orion-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.