vs_generate_artifact · VibeServe MCP: Risk & Policy

WHAT IT DOES

What vs_generate_artifact does on VibeServe

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

WHY IT NEEDS A POLICY

Why vs_generate_artifact needs a policy

This tool creates new artifacts (Write category) rather than retrieving, executing, or destructing. While the server is described as generating 'production-ready UI code', this specific tool produces advisory/structured output that is non-executable, meaning it generates recommendations or templates rather than directly deploying code.

From the tool's definition 'Generate a structured advisory artifact' indicates creation of data/documents. The descriptor explicitly states the artifact is 'not executable', ruling out Execute or Destructive categories.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vs_generate_artifact Rate-limited

vs_generate_artifact 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": {
    "vs_generate_artifact": {
      "limits": [
        {
          "counter": "vs_generate_artifact_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 VibeServe, so you can run agents against it safely.

FAQ

Questions about vs_generate_artifact

What does the vs_generate_artifact tool do? +

Generate a structured advisory artifact (not executable). It is categorised as a Write tool in the VibeServe MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on vs_generate_artifact? +

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

What risk level is vs_generate_artifact? +

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

Can I rate-limit vs_generate_artifact? +

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

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

vs_generate_artifact is provided by the VibeServe MCP server (ncsound919/vibeserve). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.