vercel.promote · MCP Fullstack MCP: Risk & Policy

WHAT IT DOES

What vercel.promote does on MCP Fullstack

AI agents invoke vercel.promote to trigger actions in MCP Fullstack. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why vercel.promote needs a policy

Promoting a deployment to production triggers an external operation that changes which version is live in a production environment. This is an Execute-level action with high blast radius — a wrong promotion could expose broken code or take down a live service. It is not Destructive (no data is deleted) and not Financial, but it does trigger a significant external state change in the production environment.

From the tool's definition Promote deployment to production

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vercel.promote Rate-limited

vercel.promote stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "vercel.promote": {
      "limits": [
        {
          "counter": "vercel.promote_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MCP Fullstack, so you can run agents against it safely.

FAQ

Questions about vercel.promote

What does the vercel.promote tool do? +

Promote deployment to production. It is categorised as a Execute tool in the MCP Fullstack MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on vercel.promote? +

Register the MCP Fullstack MCP server in PolicyLayer and add a rule for vercel.promote: 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 MCP Fullstack. Nothing to install.

What risk level is vercel.promote? +

vercel.promote is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit vercel.promote? +

Yes. Add a rate_limit block to the vercel.promote 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 vercel.promote completely? +

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

vercel.promote is provided by the MCP Fullstack MCP server (jacobfv/mcp-fullstack). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.