Recast

Recast is an experimental Smalltalk application that repairs its own code at runtime using an LLM.

Recast is an experimental Smalltalk application that connects a language model to a running application's exception path. When a failure occurs, it captures the stack, method source, receiver state, and tests, sending them to a model to propose a repair. A separate Pharo virtual machine verifies the candidate patch by running the test suite before the live image replaces the method without a restart. The system is designed for developers exploring self-maintaining software loops in Smalltalk environments. It includes a command-line interface for manual interventions, incident inspection, and journaling.

Recast at a glance

Best for: Software engineer
Runs on: CLI, self-hosted, open source
Pricing: Free
Released: October 2026
Category: AI coding tool
Website: github.com/rot13maxi/recast

Key features

Captures exception stack and receiver state
Verifies patches in a separate Pharo VM
Applies method replacements without restarting
Provides a command-line interface for management
Supports offline fake LLM for testing
Journals successful definition edits

Use it for

Repairing failing Smalltalk methods automatically
Testing self-healing software loops with an LLM
Verifying code patches in an isolated shadow VM
Managing live code updates via a command-line tool

Alternatives to Recast

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