What are the most significant advantages of adding documentation while distributing custom actions?

Documentation helps action consumers understand both what an action does and how to invoke it correctly. GitHub specifically recommends creating a README.md when publishing or sharing an action. Recommended content includes a detailed description of the action, required and optional inputs and outputs, secrets and environment variables used by the action, and an example showing how the action is referenced from a workflow. Therefore, documentation directly provides users with the action ' s description and practical usage examples. It does not automatically generate a README in the consuming repository or workflow, and documentation itself does not enable YAML autocomplete. Those capabilities are unrelated to ordinary action documentation. Clear documentation is especially important for reusable actions because consumers must understand expected inputs, outputs, permissions, and version references without inspecting the implementation source code.

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