start_application · Coolify MCP Tools MCP: Risk & Policy

WHAT IT DOES

What start_application does on Coolify MCP Tools

AI agents invoke start_application to trigger actions in Coolify MCP Tools. 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 start_application needs a policy

This tool initiates application execution, which is a real-world operational change. While not destructive (reversible via stop_application), it clearly executes commands/triggers external operations on managed infrastructure. The blast radius is high because unintended application startups could disrupt services, consume resources, or expose unready applications.

From the tool's definition Tool description states 'Start an application' — this triggers an external operation (application startup) whose effects depend on which application is targeted.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

start_application Rate-limited

start_application 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": {
    "start_application": {
      "limits": [
        {
          "counter": "start_application_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 Coolify MCP Tools, so you can run agents against it safely.

FAQ

Questions about start_application

What does the start_application tool do? +

Start an application. It is categorised as a Execute tool in the Coolify MCP Tools MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on start_application? +

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

What risk level is start_application? +

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

Can I rate-limit start_application? +

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

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

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