The Open Workflow Specification is an open-source, vendor-neutral way to describe workflows as ordered tasks in a declarative document. It defines workflow metadata, task composition, and mechanisms for shaping data; a runtime or SDK is responsible for executing or supporting those definitions. The specification describes capabilities, but support can differ between implementations.
What is the Open Workflow Specification?
Open Workflow Specification (OWS) is a DSL and related tooling for defining service-orchestration workflows. Its project describes a community-driven ecosystem within the Cloud Native Computing Foundation (CNCF), including the DSL, SDKs, runtimes, conformance tools, and documentation. The project says it was approved as a CNCF Cloud Native Sandbox-level project on July 14, 2020; that is a historical status fact, not evidence of current adoption or production readiness. Project overview
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A workflow is a blueprint made up of tasks. Unless a construct or runtime behavior says otherwise, the declared task sequence supplies the order of execution. The concepts documentation summarizes it as “A workflow defined using the Open Workflow Specification is a sequence of specific tasks that are executed in a defined order.” Workflow concepts
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The DSL Reference identifies document and do as required top-level fields. The document metadata identifies the DSL version, namespace, workflow name, and semantic version. Other top-level sections are optional and can configure inputs, reusable components, timeouts, outputs, schedules, and expression evaluation. DSL Reference
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This small YAML outline illustrates the shape, not a complete executable workflow. Check the current schema and the target runtime before using it:
document:
dsl: '1.0.3'
namespace: example
name: sample
version: '1.0.0'
do:
- firstTask:
set:
value: exampleThe published schema identifies itself as the Open Workflow DSL schema and is versioned 1.0.3. Open Workflow DSL schema
How are tasks and control flow represented?
The reference describes task forms for calling services or functions, composing tasks sequentially or concurrently, handling events, running processes or scripts, setting values, switching between branches, handling errors, and waiting. HTTP and OpenAPI call forms and other integration call types also appear in the schema and reference. DSL Reference Schema
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Script tasks and language versions
At the time the reference was accessed on October 7, 2026, it listed JavaScript ES2024 and Python 3.13.x for script tasks and cautioned that supported versions can evolve. The reference recommends container processes when a different language version is needed. These are specification-page statements, not a guarantee that a particular runtime bundles either interpreter. DSL Reference
How does data move through a workflow?
The concepts documentation describes data handling at several points in an execution:
- Workflow input: raw input can be validated and transformed before tasks begin.
- Task input: an individual task can validate or transform the data supplied to it.
- Task output: task results can be transformed and validated, then exported into workflow context.
- Next task: the transformed output from one task becomes input to the next task.
- Workflow output: the final result can be transformed before it is returned or stored.
These are mechanisms documented by the DSL. Whether and how they work in practice depends on the runtime implementation and version. Workflow concepts
What tooling and implementation status are listed?
The project overview lists a Visual Studio Code extension and a Go SDK. The Go SDK repository’s status table reports JSON/YAML parsing, programmatic workflow building, and schema validation as implemented; integrity validation and SVG workflow diagram generation are not implemented in that table. The repository describes its specification implementation as partial. These statements apply to that SDK’s listed status, not to every OWS runtime or tool. Project overview and tooling
The project also lists a conformance test kit, runtimes, and other ecosystem components. Their presence in the ecosystem does not by itself establish that a particular implementation passes a given conformance level or supports every DSL feature; verify its own documentation and version.
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Go SDK v4 migration
The Go SDK 4.0.0 release announcement gives the module path github.com/open-workflow-specification/sdk-go/v4 and says error type URIs now use the open-workflow-specification.org domain. A v3-to-v4 migration therefore requires updating imports and any old error type URI references. Confirm current release guidance before upgrading, since release details can change. Go SDK 4.0.0 release announcement
When should a team consider OWS?
OWS is worth evaluating when a team wants a declarative workflow description with task ordering, composition, data transformation, and a range of orchestration constructs. Its vendor-neutral format may be useful when comparing workflow definitions across systems, but portability depends on implementations agreeing on the DSL version and supported behavior—not merely on both accepting a YAML or JSON document.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsBefore choosing a runtime or building a migration plan, compare the specific implementations on:
- Which DSL versions and task constructs they implement, and whether conformance is documented.
- How they handle calls and integrations, including the service descriptions your workflow needs.
- Which data validation, transformation, context, and expression features are available.
- What tooling exists for authoring, parsing, schema validation, diagramming, and testing.
- How runtime, SDK, and DSL version changes affect existing workflow documents.
The sources establish OWS capabilities and selected tooling status, but do not establish a verified head-to-head comparison, broad adoption, or superiority over another workflow standard or product.
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