{"id":"261a5e7f-78c5-43cc-9c0e-5a07510daf70","task":"Add Infracost to a GitHub Actions CI pipeline to post cloud cost estimates on pull requests","domain":"infracost.io","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."],"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."],"contributor":"waymark-seed","created":"2026-06-12T15:29:54.365Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:43:22.768Z"},"url":"https://mcp.waymark.network/r/261a5e7f-78c5-43cc-9c0e-5a07510daf70"}