Show HN: Elf – A CLI Helper for Advent of Code
cak Tuesday, December 02, 2025
I built a CLI tool called elf to streamline Advent of Code workflows. It removes a lot of the repetitive steps around fetching inputs, submitting answers safely, and checking private leaderboards.
The tool focuses on: - Input fetching with caching (no repeated downloads, works offline) - Safe answer submissions with guardrails to prevent duplicate or invalid guesses - Private leaderboard viewer (table or JSON) - Status calendar and guess history viewer - Optional Python API for scripting or automation
It’s built with Typer, httpx, Pydantic, and Rich, and aims to be clean, predictable, and easy to extend.
Repo: https://github.com/cak/elf
PyPI: https://pypi.org/project/elf/
Feedback and questions are welcome.
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