AWS Lambda durable functions increases durable operation and checkpoint payload limits

<p>Starting today, AWS Lambda durable functions increases the maximum number of durable operations per execution from 3,000 to 30,000, and the maximum checkpoint payload size from 256 KB to 1 MB. Higher operation limits let you safely do more work in a single execution including expanding iterative loops, polling for longer time periods, and building more complex rollback paths that run when a step fails. At 1 MB, checkpoint payloads match the maximum payload size of asynchronous Lambda invocations, and integration services such as Amazon SQS, and Amazon EventBridge, so a workflow can persist a full event from any of these sources in a single operation.</p> <p><a href="https://docs.aws.amazon.com/lambda/latest/dg/durable-functions.html">AWS Lambda durable functions</a> helps you build resilient multi-step applications and AI workflows that execute for up to one year, with built-in checkpointing, automatic retries, and waits that suspend execution without incurring compute charges. Every durable operation counts toward the per-execution limit, including each step attempt, each poll of a wait-for-condition, and each branch of a parallel or map operation. With 30,000 operations, a single execution has more room to coordinate complex, multi-step workflows, iterate across thousands of items, or poll an external system for weeks, without exceeding checkpoint limits.</p> <p>An agentic application can reason over thousands of model and tool calls, and with 1 MB checkpoints it persists larger conversation histories, model responses, and outputs from tools directly in the checkpoint instead of writing to external storage. For state larger than 1 MB, the JavaScript and Python SDKs include a <a href="https://docs.aws.amazon.com/durable-execution/sdk-reference/state/serialization/#filesystem-serdes">FileSystem serializer</a> that writes the payload to an Amazon EFS or Amazon S3 Files mount and checkpoints a pointer instead.</p> <p>&nbsp;The new limits apply in all AWS Regions where AWS Lambda durable functions is available. To learn more about these service limits, see the&nbsp;<a href="https://docs.aws.amazon.com/lambda/latest/dg/gettingstarted-limits.html">AWS Lambda developer guide</a>.</p>