Pipeline templates currently cannot contain chained Pipeline stages. This prevents organizations from composing governed, reusable “golden” pipeline templates with independently owned build, deployment, verification, and testing pipelines. This is an unexpected gap between two core Harness capabilities. Pipeline templates are intended to provide standardization and reuse, while pipeline chaining is the native mechanism for composing workflows and passing outputs between them. The documentation also creates a reasonable expectation that this should work: template best practices state that pipeline templates support all stage types, and the dedicated pipeline-chaining documentation does not identify pipeline templates as a limitation. Without this support, platform teams must either: Embed every optional or team-specific workflow into an increasingly large golden template. Duplicate pipeline logic as stage or step templates. Copy and detach pipelines from their governing template. Trigger other pipelines through API or webhook workarounds, losing native input/output mapping, execution-graph visibility, status propagation, retry behavior, and governance. Common use cases include: Passing an image digest produced by a build pipeline into a reusable deployment pipeline. Running a service-owned regression, smoke, or post-deployment test pipeline after a standardized deployment. Deploying an ephemeral service and optional mocks before running external browser or integration tests. Composing provisioning, database migration, security, performance, chaos, promotion, or cleanup pipelines around a standard release process. Allowing platform and application teams to own and version their parts of a delivery workflow independently. Requested behavior: Allow a pipeline template to define a type: Pipeline stage with the same capabilities available in a non-templated parent pipeline, including: Selection of a concrete child pipeline. Runtime input and output mapping. Consumption of child outputs by subsequent stages. Conditions, failure strategies, and looping strategies. Existing RBAC and inline/remote SCM behavior. Referencing child pipelines that are themselves backed by pipeline templates. Templates do not need to become directly executable objects. It is sufficient for concrete parent and child pipelines instantiated from templates to participate in chaining. For an initial implementation, the existing restriction on recursive or nested pipeline chaining could remain. The essential requirement is support for a single-level chained pipeline stage within a pipeline template. This would allow organizations to keep golden templates small, governed, and reusable while giving individual teams a clean extension mechanism for specialized workflows.