infracost_cloud_create_guardrail · Infracost MCP Server MCP

WHAT IT DOES

What infracost_cloud_create_guardrail does on Infracost MCP Server

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

WHY IT NEEDS A POLICY

Why infracost_cloud_create_guardrail needs a policy

This tool creates a new guardrail configuration (a policy object) in Infracost Cloud. Creating a new resource is a Write operation. While it can 'block PRs,' that is a downstream enforcement effect of the policy, not a direct destructive or financial action. Misuse could lead to unintended PR blocking or missed cost alerts, giving it medium severity.

From the tool's definition Create cost guardrails in Infracost Cloud that notify stakeholders or block PRs when cost thresholds are exceeded

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

infracost_cloud_create_guardrail Rate-limited

infracost_cloud_create_guardrail 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": {
    "infracost_cloud_create_guardrail": {
      "limits": [
        {
          "counter": "infracost_cloud_create_guardrail_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 Infracost MCP Server, so you can run agents against it safely.

FAQ

Questions about infracost_cloud_create_guardrail

What does the infracost_cloud_create_guardrail tool do? +

Create cost guardrails in Infracost Cloud that notify stakeholders or block PRs when cost thresholds are exceeded. Requires INFRACOST_SERVICE_TOKEN environment variable. It is categorised as a Write tool in the Infracost 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 infracost_cloud_create_guardrail? +

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

What risk level is infracost_cloud_create_guardrail? +

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

Can I rate-limit infracost_cloud_create_guardrail? +

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

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

infracost_cloud_create_guardrail is provided by the Infracost MCP Server MCP server (phildougherty/infracost_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.