diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..1377554e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.swp
diff --git a/check_nightly_success/check-nightly-success/action.yaml b/check_nightly_success/check-nightly-success/action.yaml
new file mode 100644
index 00000000..7b7f30d3
--- /dev/null
+++ b/check_nightly_success/check-nightly-success/action.yaml
@@ -0,0 +1,30 @@
+name: check-nightly-summarize
+description: Check if the nightlies have succeeded recently.
+inputs:
+  repo:
+    description: "The repository to check"
+    required: true
+    type: string
+  repo_owner:
+    description: "The org that owns the repo (default RAPIDSAI)"
+    required: false
+    default: "rapidsai"
+    type: string
+  workflow_id:
+    description: "The workflow whose runs to check"
+    required: false
+    default: "test.yaml"
+    type: string
+  max_days_without_success:
+    description: "The number of consecutive days that may go by without a successful CI run"
+    required: false
+    default: 7
+    type: integer
+
+runs:
+  using: composite
+  steps:
+    - name: Run the Python script
+      shell: bash
+      run:
+          python shared-actions/check_nightly_success/check-nightly-success/check.py ${{ inputs.repo }} --repo-owner ${{ inputs.repo_owner }} --workflow-id ${{ inputs.workflow_id }} --max-days-without-success ${{ inputs.max_days_without_success }}
diff --git a/check_nightly_success/check-nightly-success/check.py b/check_nightly_success/check-nightly-success/check.py
new file mode 100644
index 00000000..8d4aeca0
--- /dev/null
+++ b/check_nightly_success/check-nightly-success/check.py
@@ -0,0 +1,74 @@
+import requests
+import itertools
+from datetime import datetime
+import sys
+import argparse
+import os
+
+# Constants
+GITHUB_TOKEN = os.environ["RAPIDS_GH_TOKEN"]
+GOOD_STATUSES = ("success",) # noqa
+
+
+def main(
+    repo: str,
+    repo_owner: str,
+    workflow_id: str,
+    max_days_without_success: int,
+):
+    headers = {"Authorization": f"token {GITHUB_TOKEN}"}
+    url = f"https://api.github.com/repos/{repo_owner}/{repo}/actions/workflows/{workflow_id}/runs"
+    response = requests.get(url, headers=headers)
+    response.raise_for_status()
+    runs = response.json()["workflow_runs"]
+    tz = datetime.fromisoformat(runs[0]["run_started_at"]).tzinfo
+    NOW = datetime.now(tz=tz)
+
+    branch_ok = {}
+    for branch, branch_runs in itertools.groupby(runs, key=lambda r: r["head_branch"]):
+        if branch.startswith("v"):  # Skip tags
+            continue
+
+        branch_ok[branch] = False
+        for run in sorted(branch_runs, key=lambda r: r["run_started_at"], reverse=True):
+            if (
+                NOW - datetime.fromisoformat(run["run_started_at"])
+            ).days > max_days_without_success:
+                break
+            if run["conclusion"] in GOOD_STATUSES:
+                branch_ok[branch] = True
+                break
+
+    all_success = all(branch_ok.values())
+    if not all_success:
+        print(
+            f"Branches with no successful runs of {workflow_id} in the last "
+            f"{max_days_without_success} days: "
+            f"{', '.join(k for k, v in branch_ok.items() if not v)}"
+        )
+    return not all(branch_ok.values())
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument("repo", type=str, help="Repository name")
+    parser.add_argument(
+        "--repo-owner", default="rapidsai", help="Repository organziation/owner"
+    )
+    parser.add_argument("--workflow-id", default="test.yaml", help="Workflow ID")
+    parser.add_argument(
+        "--max-days-without-success",
+        type=int,
+        default=7,
+        help="Maximum number of days without a successful run",
+    )
+    args = parser.parse_args()
+
+    sys.exit(
+        main(
+            args.repo,
+            args.repo_owner,
+            args.workflow_id,
+            args.max_days_without_success,
+        )
+    )
diff --git a/check_nightly_success/dispatch/action.yml b/check_nightly_success/dispatch/action.yml
new file mode 100644
index 00000000..61e52a51
--- /dev/null
+++ b/check_nightly_success/dispatch/action.yml
@@ -0,0 +1,39 @@
+name: dispatch-check-nightly-summarize
+description: Clone shared-actions and dispatch to the check-nightly-success action.
+inputs:
+  repo:
+    description: "The repository to check"
+    required: true
+    type: string
+  repo_owner:
+    description: "The org that owns the repo (default RAPIDSAI)"
+    required: false
+    default: "rapidsai"
+    type: string
+  workflow_id:
+    description: "The workflow whose runs to check"
+    required: false
+    default: "test.yaml"
+    type: string
+  max_days_without_success:
+    description: "The number of consecutive days that may go by without a successful CI run"
+    required: false
+    default: 7
+    type: integer
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Clone shared-actions repo
+      uses: actions/checkout@v4
+      with:
+        repository: ${{ env.SHARED_ACTIONS_REPO || 'rapidsai/shared-actions' }}
+        ref: ${{ env.SHARED_ACTIONS_REF || 'main' }}
+        path: ./shared-actions
+    - name: Run check-nightly-success
+      uses: ./shared-actions/check_nightly_success/check-nightly-success
+      with:
+        repo: ${{ inputs.repo }}
+        repo_owner: ${{ inputs.repo_owner }}
+        workflow_id: ${{ inputs.workflow_id }}
+        max_days_without_success: ${{ inputs.max_days_without_success }}