Show HN: Lunar, a coding harness extensible with Lua

Posted by gszr on Friday August 21, 2026 @07:07AM
from the show-hn dept.

https://github.com/gszr/lunar

Hi all! Sharing a small pet project my agents and I have been working on:

Lunar, a coding harness configurable and extensible via Lua scripts.

I'm already using Lunar to develop Lunar :) Give it a try!

Soon you will be able to extend it using Lua hooks.

( 5 comments | 5 points | on HN )

Re:Show HN: Lunar, a coding harness extensible with Lua by vickyatwork01 on Friday August 21, 2026 @07:43AM (#49386654)

Hey, this looks great. Looking forward to other endpoint support !!

[ Parent | on HN ]

Re:Show HN: Lunar, a coding harness extensible with Lua by gszr on Friday August 21, 2026 @07:45AM (#49386675)

Thank you! I will be working on that next :)

[ Parent | on HN ]

Re:Show HN: Lunar, a coding harness extensible with Lua by yoganandb on Friday August 21, 2026 @01:32PM (#49391379)

A very useful project. ~Yoganand

[ Parent | on HN ]

Re:Show HN: Lunar, a coding harness extensible with Lua by guip13 on Friday August 21, 2026 @02:11PM (#49391874)

Very neat.

In the Runta example, wouldn't read/write/edit also need to target the runtime filesystem? Otherwise the model could edit one tree and run against another.

Also, bash is currently described to the model as running in the current working directory, which would no longer necessarily be true. Is the intent for a tool slot to own its schema/description as well as its implementation?

[ Parent | on HN ]

Re:Show HN: Lunar, a coding harness extensible with Lua by gszr on Saturday August 22, 2026 @06:07AM (#49398226)

This is a great comment. Yes, for remote execution the tools need to be adjusted as well. That example is not great. I will be working on this over the next few days.

[ Parent | on HN ]