env_vars · Coolify MCP: Risk & Policy

WHAT IT DOES

What env_vars does on Coolify

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

WHY IT NEEDS A POLICY

Why env_vars needs a policy

Environment variables often contain sensitive data (API keys, passwords, database credentials, secrets). Modifying them can alter application behavior, integrate new services, or expose/restrict access.

From the tool's definition Tool name 'env_vars' with description 'Manage env vars for app, service, or database' indicates creation or modification of environment variables. The verb 'Manage' encompasses write operations on configuration data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

env_vars Rate-limited

env_vars 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": {
    "env_vars": {
      "limits": [
        {
          "counter": "env_vars_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 Coolify, so you can run agents against it safely.

FAQ

Questions about env_vars

What does the env_vars tool do? +

Manage env vars for app, service, or database. It is categorised as a Write tool in the Coolify MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on env_vars? +

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

What risk level is env_vars? +

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

Can I rate-limit env_vars? +

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

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

env_vars is provided by the Coolify MCP server (jurislm/coolify-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.