vercel_delete_env_var

THE RISK

Critical Risk

Why vercel_delete_env_var needs a policy

Deleting environment variables is an irreversible action that removes configuration from a Vercel project. This cannot be undone automatically and could break application functionality if critical variables are removed. While not directly dangerous like code deletion, it meets the Destructive category criteria as it irreversibly removes data.

From the tool's definition Tool name explicitly states 'delete' and description confirms 'Delete an environment variable'. Environment variables are configuration data that cannot be trivially recovered once deleted.

Documented attack patterns abuse exactly the kind of access vercel_delete_env_var gives an agent:

POLICY

How to control vercel_delete_env_var

PolicyLayer is an MCP gateway — it sits between your AI agents and Vercel, and nothing reaches the server without passing your rules. This is the rule we recommend for vercel_delete_env_var:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "vercel_delete_env_var"
  ]
}

vercel_delete_env_var disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

Create a free account and register Vercel — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Vercel tools

Destructive vercel_cancel_deployment Cancel a deployment that is currently building Destructive vercel_delete_domain Delete a domain Write vercel_add_domain Add a new domain Write vercel_create_env_var Create a new environment variable for a project Write vercel_update_env_var Update an existing environment variable Read vercel_get_deployment Get details of a specific deployment Read vercel_get_deployment_logs Get logs for a specific deployment Read vercel_get_project Get details of a specific Vercel project

All 13 Vercel tools →

Destructive tools on other servers

Android Forensics ADB MCP Server create_full_backup 0xarchive web3_revoke_key Frida Game Hacking MCP clear_scan cPanel MCP Server clear_spam_box

Go deeper

Critical-risk tools in Vercel → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about vercel_delete_env_var

What does the vercel_delete_env_var tool do? +

Delete an environment variable. It is categorised as a Destructive tool in the Vercel MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on vercel_delete_env_var? +

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

What risk level is vercel_delete_env_var? +

vercel_delete_env_var is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit vercel_delete_env_var? +

Yes. Add a rate_limit block to the vercel_delete_env_var 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_delete_env_var completely? +

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

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

Enforce policy on every Vercel tool call.

Start from Vercel, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →