Release 2026-07-22

Amazon.Lambda.Core (3.2.0)

• Graduate ILambdaContext.Serializer from experimental to stable. The AWSLAMBDA001 experimental diagnostic is removed; the managed runtime now populates the serializer in both the executable and class-library programming models.

Amazon.Lambda.Templates (8.1.2)

• Update the durable function blueprints (DurableFunction and serverless.DurableFunction) to reference the GA 1.0.0 Amazon.Lambda.DurableExecution and Amazon.Lambda.DurableExecution.Testing packages instead of the preview versions.

Amazon.Lambda.PowerShellHost (4.0.1)

• Update System.Security.Cryptography.Xml dependency to 8.0.4 for .NET 8 and 10.0.10 for .NET 10
• Update System.Security.Cryptography.Xml dependency to address known vulnerabilities (net8.0: 8.0.3 to 9.0.18, net10.0: 10.0.7 to 10.0.10)

Amazon.Lambda.TestUtilities (4.2.0)

• Graduate TestLambdaContext.Serializer from experimental to stable, mirroring the graduation of ILambdaContext.Serializer. The AWSLAMBDA001 experimental diagnostic is removed.

Amazon.Lambda.DurableExecution (1.0.0)

• General availability release. Amazon.Lambda.DurableExecution is now GA and stable at 1.0.0; the SDK is no longer preview.

Amazon.Lambda.DurableExecution.Testing (1.0.0)

• General availability release. Amazon.Lambda.DurableExecution.Testing is now GA and stable at 1.0.0; the package is no longer preview.

Release 2026-07-14

Amazon.Lambda.DurableExecution (0.3.2-preview)

• Fix two durable Map/Parallel conformance issues found via cross-SDK testing. (1) Per-item map iteration child contexts now use the SubType "MapIteration" (was "MapItem"), matching the JS/Python/Java SDKs. (2) Persist each unit's result/error inline on the parent Parallel/Map SUCCEED payload for Nested nesting (previously only Flat), so a batch that completes and then suspends (e.g. a wait after the map) reconstructs its per-item results correctly on replay — the service collapses completed per-unit child contexts out of the resumed state, so the inline copy is the authoritative source. Large aggregate results still overflow to the ReplayChildren path. Preview.

Release 2026-07-13

Amazon.Lambda.DurableExecution (0.3.1-preview)

• Fix durable execution conformance issues found via cross-SDK testing. WaitForCondition now re-emits a fresh START on each poll iteration (READY/PENDING replays), matching the Python/JS/Java SDKs and the spec; only a STARTED-status replay skips it. Preview.

Release 2026-07-10

Amazon.Lambda.DurableExecution (0.3.0-preview)

• Add virtual-context support to standalone RunInChildContextAsync via ChildContextConfig.NestingType. Setting NestingType.Flat runs the child in a virtual context that emits no CONTEXT checkpoint of its own (mirroring MapConfig/ParallelConfig), enabling manual fan-out with Task.WhenAll while reducing checkpoint volume.
• Align ParallelAsync/MapAsync failure semantics with the JS/Python SDKs (breaking, preview). ParallelAsync and MapAsync no longer throw on failure — they always return an IBatchResult; inspect CompletionReason/HasFailure or call ThrowIfError(). The ParallelException and MapException types are removed. MapConfig.CompletionConfig now defaults to AllSuccessful() (fail-fast), matching ParallelConfig. An empty CompletionConfig() is now fail-fast (any failure resolves FailureToleranceExceeded); use CompletionConfig.AllCompleted() to run every unit regardless of failures. MapConfig is now generic (MapConfig) so ItemNamer is typed Func<TItem, int, string> instead of Func<object, int, string>. Preview.

Amazon.Lambda.Annotations (2.3.0)

• Add diagnostic AWSLambda0145 (Warning) for durable execution functions. When a [DurableExecution] function registers the source-generator serializer (SourceGeneratorLambdaJsonSerializer), the durable invocation envelope types DurableExecutionInvocationInput and DurableExecutionInvocationOutput must be registered on the JsonSerializerContext with [JsonSerializable]. The generator now warns at build time when either is missing, instead of the function failing at invocation time. Preview.

Amazon.Lambda.Templates (8.1.1)

• Set AutoPublishAlias to 'live' on the function in the serverless.DurableFunction blueprint (vs2026). SAM now publishes a new function version and points the 'live' alias at it on every deploy, so the durable function can be invoked immediately after deployment instead of failing with a no-published-version error. Preview.

Release 2026-07-02 #2

Amazon.Lambda.Templates (8.1.0)

• Add lambda.DurableFunction and serverless.DurableFunction blueprints (vs2026) for Lambda durable execution workflows. lambda.DurableFunction uses the class-library static-wrapper model (DurableFunction.WrapAsync) and deploys via dotnet lambda deploy-function; serverless.DurableFunction uses the annotations model ([LambdaFunction] + [DurableExecution]) and deploys via CloudFormation (serverless.template). Both target the managed dotnet10 runtime and ship a sample ProcessOrder workflow plus a local test project driven by Amazon.Lambda.DurableExecution.Testing. Preview.

Release 2026-07-02

Amazon.Lambda.DurableExecution (0.2.0-preview)

• Add Roslyn analyzers (DE001-DE004) that catch common durable-execution authoring mistakes at build time, bundled in the package so they activate automatically for consumers. DE001 (Warning) flags non-deterministic APIs (DateTime.Now, Guid.NewGuid(), Random, Stopwatch, Environment.TickCount, crypto RNG) used in workflow code outside a step. DE002 (Warning) flags a durable operation invoked inside a step body via the captured outer IDurableContext. DE003 (Warning) flags mutation of a captured outer-scope variable inside a durable-operation delegate. DE004 (Info) suggests ParallelAsync/MapAsync over Task.WhenAll/Task.WhenAny for durable tasks. DE001 and DE004 include code fixes. Preview.

Amazon.Lambda.Annotations (2.2.0)

• Breaking Change: Make ExecutionTimeout a required constructor argument on [DurableExecution]. The Lambda service rejects a durable function whose DurableConfig has no ExecutionTimeout, so the source generator now always emits it and never produces an empty DurableConfig block that would fail deployment. RetentionPeriodInDays remains an optional named property.

Amazon.Lambda.DurableExecution.Testing (0.1.0-preview)

• Add Amazon.Lambda.DurableExecution.Testing package
• Fix local test runner spinning on real timers/retry backoffs when SkipTime is disabled by delaying until the next scheduled resume time, and throw an actionable error when WaitForResultAsync is called without a prior StartAsync

Release 2026-06-26

Amazon.Lambda.DurableExecution (0.1.2-preview)

• Add internal IDurableServiceClient abstraction over the durable execution service RPCs so the testing package can inject an in-memory implementation; route DurableFunction.WrapAsync overloads through it.

Release 2026-06-25

Amazon.Lambda.Annotations (2.1.0)

• Add [DurableExecution] attribute and source generator support for durable execution functions. A method annotated with [LambdaFunction] and [DurableExecution] generates a handler wrapper that delegates to Amazon.Lambda.DurableExecution.DurableFunction.WrapAsync, and emits a DurableConfig block plus the lambda:CheckpointDurableExecution / lambda:GetDurableExecutionState IAM permissions in the generated CloudFormation/SAM template. Supports both the executable and class-library programming models on the managed runtime. Validates Zip packaging, the (TInput, IDurableContext) -> Task/Task signature, and the RetentionPeriodInDays / ExecutionTimeout bounds (AWSLambda0141-AWSLambda0144). Preview.

Release 2026-06-22 #3

Amazon.Lambda.DurableExecution (0.1.1-preview)

• Identify durable-execution requests with an user-agent component so the service can track .NET SDK usage at runtime, matching the sibling Python/Java/JS SDKs.

Amazon.Lambda.Core (3.1.1)

• Fix type load issue due to Lambda Response Streaming. #2430

Amazon.Lambda.RuntimeSupport (2.1.2)

• Fix type load issue due to Lambda Response Streaming. #2430

Release 2026-06-22

Amazon.Lambda.DurableExecution (0.1.0-preview)

• Implement NestingType.Flat for ParallelAsync and MapAsync (previously threw NotSupportedException). Under Flat, each branch/item runs in a virtual context that emits no per-branch CONTEXT checkpoint; per-branch results and errors are recorded inline on the parent operation's payload, reducing checkpoint volume. Operations inside a flat branch (steps, waits) still checkpoint, re-parented to the parallel/map operation. NestingType.Nested remains the default.
• Handle large results (over the 256 KB per-operation checkpoint limit) for , , and . When a Flat concurrent operation's summary or a child context's result exceeds the limit, the inline result is stripped from the checkpoint and the operation is flagged with ; on a later replay the unit/child bodies are re-executed to recover the stripped values without re-checkpointing the already-terminal parent. Plain and results are unaffected, matching the Python/Java/JS SDKs.
• Enforce the request byte limit: the batcher pre-flushes before an operation update would push a batch over the byte (or count) cap, and sends an oversized update on its own.