Forall – An AI coding agent that generates machine-checkable proofs

In plain words

Forall is an open-source AI coding agent that generates code alongside machine-checkable proofs to verify correctness. It targets developers and researchers interested in formal verification, particularly those working with Lean, Dafny, or exploring AI-assisted programming. The tool currently supports verification in three languages and aims to combine automated code generation with formal proof capabilities.

written from the facts on this page · September 2026

From the sources

Forall (∀) is a coding agent from Astrio that helps developers build correct software by generating spec-driven code alongside machine-checkable proofs. - astrio-labs/forall

Review has always been the bottleneck in software. It is now the failure point, because code is produced faster than anyone can check it. Tests sample a handful of inputs. Types constrain shape. Neither tells you whether the code does what it was supposed to do. Formal verification answers that question, as far as your specification states it, and it never failed on capability. Provers have been checking real programs for years. What kept them out of ordinary engineering was adoption cost. Writing the specifications, contracts and invariants a prover needs was more tedious than writing the code itself. That is precisely the work language models are now good at. The barrier was labour, and…from github.com

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