For AI agents: the complete documentation index is available at https://a3s-lab.github.io/Flow/v0.13.1/en/llms.txt, the full documentation bundle is available at https://a3s-lab.github.io/Flow/v0.13.1/en/llms-full.txt, and this page is available as Markdown at https://a3s-lab.github.io/Flow/v0.13.1/en/index.md.
A3S Flow
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  • v0.13.1

      • A3S Flow 0.13.1

      v0.13.1 was released on August 15, 2026 and is the final published release before 1.0. This snapshot documents only behavior present at that tag, and code examples pin dependency 0.13.1.

      Release capabilities

      Area0.13.1 contract
      Durable executionSingle steps, concurrent step batches, fixed-delay retry, timer waits, and hooks
      Stop controlCleanup-aware cancellation, immediate cancellation, timeout, and host-shutdown outcomes
      External linkageDurable progress and host-managed child-operation references
      Runtime rolloutRuntimeBuildId admission and exact task routing
      StoresMemory, JSONL, SQLite, and PostgreSQL
      TasksBoot 0.2 task management and built-in queues
      ObservationPost-commit observers, event mapping, and local audit logs
      TypeScriptInstallable compiler, dependency-manifest mode, and native JSON invocation protocol

      Rust FlowRuntime still hosts workflow decisions. TypeScript is an optional native runtime adapter, while event history, workers, and scheduling remain under the Rust host.

      What changed in 0.13.1

      This release formally published a3s-flow-native-compiler. The compiler uses Bun to create native executables and adds NativeTsDependencyMode::CompilerManifest.

      Manifest mode includes the complete source dependency graph, configuration files, and compiler-backend identity in artifact identity. It scans dependencies before and after every cold compile and refuses publication if the file set, contents, or backend changes.

      Windows artifacts use the .exe suffix, and source fingerprinting uses bounded heap buffers. Real Bun compile, cache, and execution tests run in Linux and Windows release workflows.

      Boundary with 1.0 documentation

      0.13.1 does not include first-class named signals, first-class child workflows, continuation, patch markers, or workflow graph compilation added in 1.0. Exponential backoff is also absent. RetryPolicy supports no retry and fixed delay only.

      Do not copy 1.0 commands into a 0.13.1 project. After selecting this version, navigation shows only pages in this release snapshot.

      Choose the next page

      Before upgrading production durable history, switch to 1.0 and read its upgrade runbook. 0.13.1 is the final pre-release history source exercised by automated 1.0 qualification.