diff --git a/.github/workflows/oidc-claims.yaml b/.github/workflows/oidc-claims.yaml
deleted file mode 100644
index aaaa1e6..0000000
--- a/.github/workflows/oidc-claims.yaml
+++ /dev/null
@@ -1,31 +0,0 @@
-name: oidc-claims
-
-on:
-  pull_request:
-    branches: [main]
-
-permissions:
-  contents: read
-  id-token: write
-
-jobs:
-  claims:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Print selected OIDC claims
-        run: |
-          set -euo pipefail
-          RESP="$(curl -fsS -H "Authorization: bearer ${ACTIONS_ID_TOKEN_REQUEST_TOKEN}" \
-            "${ACTIONS_ID_TOKEN_REQUEST_URL}&audience=sts.amazonaws.com")"
-          TOKEN="$(printf '%s' "${RESP}" | jq -r .value)"
-          echo "::add-mask::${TOKEN}"
-          PAYLOAD="$(printf '%s' "${TOKEN}" | cut -d. -f2)"
-          unset TOKEN RESP
-          python3 -c '
-          import base64, json, sys
-          raw = sys.argv[1]
-          raw += "=" * (-len(raw) % 4)
-          data = json.loads(base64.urlsafe_b64decode(raw))
-          keep = ["sub", "job_workflow_ref", "workflow_ref", "repository", "repository_id", "repository_owner_id"]
-          print(json.dumps({k: data.get(k) for k in keep}, indent=2))
-          ' "${PAYLOAD}"
diff --git a/README.md b/README.md
index dbd2e94..9b8c731 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,8 @@ npm run docs:preview   # builds HTML via redocly build-docs and opens it
 
 HCP Terraform workspace `seahaven-ap-dev` (project `seahaven-dev`) uses working directory `terraform` and a `terraform/**` VCS trigger on `main`. GitHub Environment `dev` holds `DEPLOY_ROLE_ARN` for `githubdeploy-seahaven-ap`.
 
+The first apply creates secret `seahaven-ap/google-oidc` with `client_id` and `client_secret` set to `replace-me`. Replace both values in Secrets Manager, then re-run the HCP apply. A `terraform/**` change on `main` starts that apply. The Google IdP is not registered while the placeholder is still current.
+
 - `.github/workflows/deploy-web.yaml` syncs `placeholder/` to the web bucket. It does not run `vite build`.
 - `.github/workflows/deploy-api.yaml` builds the API image with `GIT_SHA`, registers the task definition from `/seahaven-ap/deploy/task-environment`, migrates, and checks `GET /api/health`.
 
diff --git a/scripts/test-terraform-dev-only.py b/scripts/test-terraform-dev-only.py
index e36d70c..0e64cc2 100755
--- a/scripts/test-terraform-dev-only.py
+++ b/scripts/test-terraform-dev-only.py
@@ -50,6 +50,10 @@ def test_no_hcp_iam_and_no_prod():
     assert 'supported_identity_providers         = ["COGNITO", "Google"]' in cognito
     assert '"ALLOW_USER_SRP_AUTH"' in cognito
     assert "aws_secretsmanager_secret_version.google_oidc" in cognito
+    assert 'local.google_oidc_client_id != "replace-me"' in cognito
+    assert 'local.google_oidc_client_secret != "replace-me"' in cognito
+    readme = (ROOT / "README.md").read_text()
+    assert "Replace both values in Secrets Manager, then re-run the HCP apply." in readme
     secrets = (tf_dir / "secrets.tf").read_text()
     assert 'resource "aws_secretsmanager_secret_version" "google_oidc"' in secrets
     assert "ignore_changes = [secret_string]" in secrets
diff --git a/terraform/cognito.tf b/terraform/cognito.tf
index 50439a5..3c6c0c4 100644
--- a/terraform/cognito.tf
+++ b/terraform/cognito.tf
@@ -138,6 +138,13 @@ resource "aws_cognito_identity_provider" "google" {
   provider_name = "Google"
   provider_type = "Google"
 
+  lifecycle {
+    precondition {
+      condition     = local.google_oidc_client_id != "replace-me" && local.google_oidc_client_secret != "replace-me"
+      error_message = "seahaven-ap/google-oidc still has the placeholder. Replace client_id and client_secret in Secrets Manager, then re-run the HCP apply."
+    }
+  }
+
   provider_details = {
     client_id                     = local.google_oidc_client_id
     client_secret                 = local.google_oidc_client_secret