Observed Signal · Apr 26, 2026 · Technical Release · Source: DEV Community · Impact: 2/5 · Sentiment: Neutral
Create EventBridge Scheduler with ActionAfterCompletion
The article demonstrates how to create an AWS EventBridge Scheduler schedule that uses the ActionAfterCompletion property (for example, DELETE) via a CloudFormation custom resource. Because AWS::Scheduler::Schedule in CloudFormation does not currently support ActionAfterCompletion, the author implements a custom resource backed by an AWS Lambda function (deployed with AWS SAM) that calls the EventBridge Scheduler API through boto3. The post includes a full sample Lambda (Python with pydantic validation and HTTP response helper), a sample CloudFormation template showing ActionAfterCompletion: DELETE and a link to a GitHub repository with code and SAM template. Notes cover CloudFormation drift implications and recommend treating ResourceNotFoundException as success on deletion.
Provides a practical workaround for a CloudFormation limitation by using a Lambda-backed custom resource to enable EventBridge Scheduler's ActionAfterCompletion; useful for cloud-infrastructure automation but not industry-shifting.
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Key Takeaways & Evidence Grounding
- AWS::Scheduler::Schedule CloudFormation resource does not natively support the ActionAfterCompletion property.
- The author implements a CloudFormation custom resource (AWS::CloudFormation::CustomResource) backed by an AWS Lambda function to create schedules with ActionAfterCompletion.
- Sample Lambda code (Python) uses boto3 and pydantic for request handling and is published in a GitHub repository: https://github.com/H0ukiStar/sample-aws-cfn-schedule-with-action-after-completion.
- A sample CloudFormation template demonstrates creating a scheduled at(...) expression with ActionAfterCompletion: DELETE and recommends replacing ServiceToken and target ARNs with real values.
- When ActionAfterCompletion is DELETE the schedule is removed after execution and CloudFormation will not show drift; custom resource deletion should handle ResourceNotFoundException as success.
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