fx opens native coding-agent harness

fx is most interesting as infrastructure for building coding agents, not as another end-user assistant. Its small native footprint could make experimentation and embedded deployments significantly easier.

• –Zig enables fast startup and low runtime overhead
• –Harness-first design gives researchers control over models, tools, and execution loops
• –Embedding support could enable agents inside IDEs, developer tools, and automated workflows
• –Open sourcing the project lets the community inspect and extend Vercel’s internal approach
• –Its long-term value will depend on ecosystem maturity, documentation, and compatibility with existing agent protocols