Pu.sh ships 400-line coding harness

The interesting part here is not feature parity with bigger agent CLIs; it is the proof that the core loop can be brutally small if you accept hard tradeoffs. That makes Pu.sh a sharp reference implementation for portability, even if it is not the daily-driver answer for most teams.

• –The portability story is real: no Node, no Python, no Docker, just a script you can drop onto almost any Unix-like box
• –Exact-text editing plus minimal tools keeps the harness understandable, but also limits UX polish and extensibility
• –OpenAI Responses API reasoning-item carryover is a notable technical detail for people building their own agent loops
• –The explicit gaps matter: no TUI, no streaming, no OAuth, and no native Windows support
• –The 90 behavioral tests make this more than a stunt; it looks like an intentionally small but tested harness, not just a demo