publish_vehicle · StockSpark MCP Server MCP: Risk & Policy

WHAT IT DOES

What publish_vehicle does on StockSpark MCP Server

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

WHY IT NEEDS A POLICY

Why publish_vehicle needs a policy

Publishing a vehicle listing creates new data on external portals and modifies the vehicle's visibility/status. This is a reversible Write operation (listings can be unpublished or delisted), not a read operation, not an execute operation triggering arbitrary code, and not destructive or financial.

From the tool's definition Tool name 'publish_vehicle' and description 'Publish vehicle to specified portals (MyPortal and/or automobile.it)' indicate creation/modification of published listings on external platforms.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

publish_vehicle Rate-limited

publish_vehicle 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": {
    "publish_vehicle": {
      "limits": [
        {
          "counter": "publish_vehicle_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 StockSpark MCP Server, so you can run agents against it safely.

FAQ

Questions about publish_vehicle

What does the publish_vehicle tool do? +

Publish vehicle to specified portals (MyPortal and/or automobile.it). It is categorised as a Write tool in the StockSpark MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on publish_vehicle? +

Register the StockSpark MCP Server MCP server in PolicyLayer and add a rule for publish_vehicle: 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 StockSpark MCP Server. Nothing to install.

What risk level is publish_vehicle? +

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

Can I rate-limit publish_vehicle? +

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

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

publish_vehicle is provided by the StockSpark MCP Server MCP server (loukach/stockspark-mcp-poc). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.