Developer corner¶

lightcone-cli is a thin shim over Snakemake that owns provenance. This guide covers everything below the user surface: how the execution and integrity layers work, what each engine module does, how the Claude Code plugin is structured, and how to get a working dev loop.

If you're looking for the user-facing docs, the user guide is the other half of this site.

What this covers¶

Architecture — the three subsystems (Snakefile generation, manifest layer, cluster management) and the invariants that hold them together.
CLI Reference — every lc command: flags, options, and the exact Snakemake invocation each one triggers.
Python API — the lightcone.engine.* modules: public signatures, common entry points, and module responsibilities.
Skills — what each /lc-* Claude Code skill does, including the full /lc-from-paper reproduction bundle.
HPC & SLURM — how the Dask cluster manager adapts to local, SLURM, and external schedulers.
Contributing — clone, install, run the test suite, lint, and build the docs locally.

Get started in three commands¶

Dev loop

git clone https://github.com/LightconeResearch/lightcone-cli.git
cd lightcone-cli
just install        # uv sync --all-groups
just test           # pytest

Run just with no arguments to see all available recipes.

What lightcone-cli owns¶

The codebase is intentionally small. Snakemake handles DAG construction, parallelism, cluster submission, staleness detection, locking, and log capture — we do not replicate any of that. The parts that are ours:

Snakefile generator — translates astra.yaml into .lightcone/Snakefile.
Manifest layer — writes and verifies .lightcone-manifest.json per output.
Cluster manager — picks local / SLURM / external Dask shape at runtime.
Claude Code plugin — skills, hooks, and agents bundled into the wheel.