The Complete Production SOP: How to Deploy and Run Infracost Cloud Cost Estimates in Pull Requests in Autonomous AI Agents

---
name: "infracost-cloud-cost-estimates"
description: "Estimate cloud cost impact of Terraform pull requests directly in GitHub/GitLab comments."
metadata:
  author: "Infracost"
  version: "1.0.0"
  runtime_compatibility:
    - "codex"
    - "claude-code"
    - "cursor"
    - "windsurf"
triggers:
  - "estimate terraform cost infracost"
  - "infracost pull request comment"
  - "finops cloud budget"
permissions:
  fs_read: true
  fs_write: "workspace"
  shell_exec: true
  net_access: true
---

# Infracost Cloud Cost Estimates SOP
1. Ensure INFRACOST_API_KEY is present in environment.
2. Generate target plan: `terraform plan -out=tfplan.binary && terraform show -json tfplan.binary > plan.json`.
3. Run baseline comparison: `infracost diff --path plan.json --compare-to baseline.json --format json --out-file infracost-diff.json`.
4. Format markdown summary for PR commentary: `infracost output --path infracost-diff.json --format github-comment`.

name: Infracost PR Cost Assessment
on: [pull_request]
jobs:
  infracost:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: hashicorp/setup-terraform@v3
      - uses: infracost/actions/setup@v3
        with:
          api-key: ${{ secrets.INFRACOST_API_KEY }}
      - name: Generate Infracost Diff
        run: |
          terraform init
          terraform plan -out=tfplan.binary
          terraform show -json tfplan.binary > plan.json
          infracost diff --path plan.json --format=json --out-file=/tmp/infracost.json
      - name: Post Infracost Comment
        run: |
          infracost comment github --path=/tmp/infracost.json \
            --repo=$GITHUB_REPOSITORY \
            --github-token=${{ secrets.GITHUB_TOKEN }} \
            --pull-request=${{ github.event.pull_request.number }} \
            --behavior=update

#!/usr/bin/env bash
set -euo pipefail

# Generate current baseline from main branch
git fetch origin main
git checkout origin/main
terraform init
terraform plan -out=baseline.binary
terraform show -json baseline.binary > baseline.json

# Switch back and generate diff
git checkout -
terraform plan -out=branch.binary
terraform show -json branch.binary > plan.json
infracost diff --path plan.json --compare-to baseline.json