fx :Tiny, open, native coding agent.
- ID
- 16098
- Status
- summarized
- Published
- 19 Aug 2026, 6:00 AM
- Fetched
- 21 Aug 2026, 6:04 AM
- Provider
- Hacker News
- Category
- dev-community
- Original URL
- https://fx.sh/
- Source URL
- https://hnrss.org/best
Summary
- Score
- 6.5
- Created
- 21 Aug 2026, 6:04 AM
- Tags
- Audience
- developersvibe_codersai_agent_users
What happened
fx is a new, experimental open-source coding agent harness and CLI written in Zig, featuring a tiny 6.39MiB binary size and 10µs cold start time. It is designed for minimalism, embeddability, and model-agnostic use (local or cloud), offering a shell-like UI rather than a heavy terminal IDE.
Why it matters
Builders looking to embed coding agents into larger systems or run them in resource-constrained sandboxes can evaluate fx's minimal memory footprint and WebAssembly support. Its model-agnostic design means you can swap underlying LLMs without changing the harness.
Discussion angle
Comparing the performance and embeddability of a 6MB Zig-based coding agent against heavier Python/Node-based alternatives for automated pipelines.