Steps

Add the Infracost GitHub Actions step using `uses: infracost/actions/setup@v3` to install the CLI, authenticating with `INFRACOST_API_KEY` stored as a GitHub Actions secret.
Run `infracost breakdown --path . --format json --out-file /tmp/infracost-base.json` on the base branch, and the same command on the PR branch, saving to separate JSON files.
Run `infracost diff --path . --compare-to /tmp/infracost-base.json --format json --out-file /tmp/infracost-diff.json` to compute the cost delta.
Post the diff as a PR comment with `infracost comment github --path /tmp/infracost-diff.json --repo $GITHUB_REPOSITORY --pull-request $PR_NUMBER --github-token $GITHUB_TOKEN`.
Alternatively, install the Infracost GitHub App for a simpler setup that requires no manual Actions configuration and handles the comment lifecycle automatically.
Use `infracost comment --behavior update` to update the existing comment on re-runs rather than posting duplicate comments.

Known gotchas

Infracost requires `terraform init` to have been run (or at least a `.terraform.lock.hcl` present) before `infracost breakdown` can resolve module dependencies and provider schemas.
Cost estimates are based on Infracost's cloud pricing database, which may not reflect negotiated enterprise discount rates or reserved instance pricing; treat estimates as list-price approximations.
The Infracost GitHub App requires installation at the organization level; if the org restricts third-party app installs, use the Actions-based integration with an API key instead.

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Add Infracost to a GitHub Actions CI pipeline to post cloud cost estimates on pull requests

Steps

Known gotchas

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