Init – a Rust agent harness that recompiles and hot-swaps its own core mid-task

The harness is everything around the model: its prompts, tools and loop. INIT rewrites its own, tests each change and swaps it in, mid-conversation. A Root it can never touch can undo any change.

Diagram. One cell is one real file of INIT v0.3.3: 7 prompt and skill files, 5 tool files and 124 compiled-core files. The kernel is drawn as a texture, not counted. Gate and swap times are measured, and the rollback is a real signed record (2026-10-21, seq 88 to 90). Motion, and all of step 5, are illustrative.

One cell per real file at v0.3.3, the last measured release. Coloured: files INIT changed itself.

The model may rewrite almost all of itself. One thing it can never touch: the Root, which holds the keys, the record and the undo.