plan_deployment · Terragrunt GCP Tool MCP: Risk & Policy

WHAT IT DOES

What plan_deployment does on Terragrunt GCP Tool MCP

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

WHY IT NEEDS A POLICY

Why plan_deployment needs a policy

An AI agent can call plan_deployment faster than any human can review — one bad instruction and it creates or modifies resources in Terragrunt GCP Tool MCP by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

plan_deployment Rate-limited

plan_deployment 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": {
    "plan_deployment": {
      "limits": [
        {
          "counter": "plan_deployment_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 Terragrunt GCP Tool MCP, so you can run agents against it safely.

FAQ

Questions about plan_deployment

What does the plan_deployment tool do? +

Generate deployment plan for changes (deprecated, use plan_resource_deployment). It is categorised as a Write tool in the Terragrunt GCP Tool MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on plan_deployment? +

Register the Terragrunt GCP Tool MCP server in PolicyLayer and add a rule for plan_deployment: 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 Terragrunt GCP Tool MCP. Nothing to install.

What risk level is plan_deployment? +

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

Can I rate-limit plan_deployment? +

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

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

plan_deployment is provided by the Terragrunt GCP Tool MCP server (spolspol/terragrunt-gcp-tool-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.