Pyplines Python Library

The Pyplines Python library provides the Action author SDK and invocation shim. The separate pyplines-builder application builds images and Distributions.

from pyplines import Context, Input, Output


class GreetingInput(Input):
    name: str


class GreetingOutput(Output):
    message: str


def handler(i: GreetingInput, ctx: Context) -> GreetingOutput:
    ctx.log.info("Building greeting", name=i.name)
    return GreetingOutput(message=f"Hello, {i.name}!")

Action projects use a standard Python build backend such as setuptools and declare exactly one handler entry point in [project.entry-points."pyplines.action"]. pyplines-builder installs the package and this SDK inside the target image, validates the handler, and embeds its input/output schemas. The former Action Package build backend has been retired to legacy/action-builder/sdk-package. See example/v1alpha1/distributions/hello-world for the current authoring shape.

The public author API is:

from pyplines import ArtifactRef, Context, Error, Input, Output

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Publisher: publish-release.yml on pyplines/pyplines

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Statement:
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- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: pyplines-2026.9.4a2.tar.gz
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Source repository:
- Permalink: pyplines/pyplines@fb911df6a35a0198357fa8e2584e9b4a417d2000
- Branch / Tag: refs/tags/v2026.9.4a2
- Owner: https://github.com/pyplines
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