custom-blocks

## What this skill is for A `ModularPipelineBlocks` subclass is a unit of pipeline logic — input/output spec plus a `__call__` — that slots into diffusers' modular pipeline composition. Once you have one defined locally, you almost always want to publish it as a small Hub repo so others can `from_pretrained` it. `diffusers-cli custom_blocks` automates the packaging step: it parses your Python file, instantiates the chosen block class, and writes a `save_pretrained`-style directory in your cwd that's ready to push to the Hub. Use this skill when: - The user is writing a custom modular block and asks "how do I publish this?" or "package this for the Hub". - The user has a `block.py` (or similar) file with one or more `ModularPipelineBlocks` subclasses. - You're scaffolding a new modular pipeline repo and need the on-disk layout that `ModularPipelineBlocks.from_pretrained` expects. Don't use this skill for: running an existing modular pipeline (`diffusers-cli run`), introspecting one (`diffusers-cli schema`), or writing the block class itself — this skill packages an *already-written* block. ## The end-to-end workflow ``` [you: write block.py] → diffusers-cli custom_blocks → [packaged dir in cwd] ↓ hf upload <repo> . ↓ consumers: ModularPipeline.from_pretrained(<repo>, trust_rem...