Jiti – Grow a running Lisp application by talking to it

Jiti is a cooperative kernel that lets developers grow and interact with a live Common Lisp application through a chat-style interface. Users can ask for functions to be added, compose them, run expressions and inspect source; accepted definitions become ordinary Lisp functions stored in a persistent workspace and available to later requests without model inference. The system runs a persistent SBCL worker per managed world, a controller mediates validated tool calls from a model, and a world adapter declares what state and resources are managed. Installation uses Nix and devenv; examples include defining simple string utilities, composing them into named functions, and re-entering a workspace to recover accepted code and data. Manual Lisp interaction works without model credentials.

Execution and development are transactional and guarded: every attempt checkpoints before compile/eval, and preview operations return results then restore the checkpoint. Two primary tools - develop_form (add/redefine/remove) and execute_form - share an evaluator and transaction engine; caller-supplied checks express goals and safety invariants and must pass for changes to be accepted. The worker preserves live stacks and paused restarts so controller-driven repairs can be applied within the running dynamic extent. Accepted changes become immutable revisions with diagnostics, rollback and recovery semantics. The terminal exposes commands (/functions, /develop, /execute, /preview, /rollback, /abort, /context, /model, etc.), configurable tool limits and model integration via OpenAI-compatible endpoints.