========
Concepts
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.. meta::
   :description: The ideas behind Lakehouse Plumber — how it compiles pipelines, the action model, dependency inference, substitution, the reuse ladder, and the agent-facing skill.

The guides show you *how*; these pages explain *why*. Read them when you want the
mental model behind Lakehouse Plumber — the reasoning that makes the rest of the
documentation click into place.

.. toctree::
   :maxdepth: 1

   How LHP works <how-lhp-works>
   The action model <the-action-model>
   Flowgroups & dependencies <flowgroups-and-dependencies>
   Substitution & environments <substitution-and-envs>
   Choosing a reuse tool <presets-templates-blueprints>
   Coding agents & the skill <coding-agents-and-the-skill>