update_environment_variable · Coolify MCP Server MCP

WHAT IT DOES

What update_environment_variable does on Coolify MCP Server

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

WHY IT NEEDS A POLICY

Why update_environment_variable needs a policy

This tool modifies (rather than deletes) existing configuration state reversibly. It is Write category rather than Destructive since updates can typically be reverted. Severity is high because environment variables often contain sensitive credentials, database connection strings, API keys, and other configuration that controls application behavior and security posture; misuse could compromise application…

From the tool's definition Tool name 'update_environment_variable' and description 'Update an existing environment variable' indicate modification of configuration data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_environment_variable Rate-limited

update_environment_variable 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": {
    "update_environment_variable": {
      "limits": [
        {
          "counter": "update_environment_variable_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 MCP Server, so you can run agents against it safely.

FAQ

Questions about update_environment_variable

What does the update_environment_variable tool do? +

Update an existing environment variable. It is categorised as a Write tool in the Coolify 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 update_environment_variable? +

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

What risk level is update_environment_variable? +

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

Can I rate-limit update_environment_variable? +

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

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

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