Pu.sh – a full coding-agent harness in 400 lines of shell
I originally was just messing with pi-autoresearch. Gave it a sample task to build the most portable coding agent. First cut was 6 KB of shell. Great for one-shots, unusable interactively. I was shocked it actually worked. Started building up -- adding features — but with a self-imposed rule: no new dependencies, and sub 500 LOC. This thing had to be truly portable. Just sh, curl, awk. System primitives only. Which means I did some genuinely disgusting things in awk, including JSON parsing and the OpenAI Responses tool loop with reasoning items carried across turns. It's now ~400 lines. In…
Pu.sh – a full coding-agent harness in 400 lines of shell launched on April 30, 2026 with 92 votes, #472 of 21,248 launches that month and more than 95% of that year's launches.
In plain words
Pu.sh is a coding agent written in approximately 400 lines of shell script that works with Anthropic or OpenAI APIs. It uses only standard Unix tools (sh, curl, awk) with no external dependencies, making it highly portable. The agent includes seven tools for file and system operations, supports interactive use, checkpointing, and pipe mode. It is designed for developers who need a lightweight, self-contained coding assistant that runs on minimal infrastructure.
written from the facts on this page · September 2026
From the sources
A zero-package-dependency coding agent under 50KB. No npm. No pip. No Docker. Just sh, curl, awk, and an API key.
$ curl -sL pu.dev/pu.sh -o pu.sh && chmod +x pu.sh $ ./pu.sh no npm · no pip · no docker · no node · just sh , curl , awk , and an apifrom pu.dev
In the maker’s words, at launch
I originally was just messing with pi-autoresearch. Gave it a sample task to build the most portable coding agent. First cut was 6 KB of shell. Great for one-shots, unusable interactively. I was shocked it actually worked. Started building up -- adding features — but with a self-imposed rule: no new dependencies, and…
Pricing, as stated on its site
Free — No pricing information found on the website. Pu.sh appears to be an open-source tool (MIT license) with no pricing page or pricing model mentioned.
checked October 2026 · prices change
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