Greyforge Labs releases Sley, an agent-native structural programming language with deterministic execution and auditable code modifications.

Sley is a programming language designed for AI agents that uses a compiler (Loom) to read human-reviewable source code, expose typed abstract syntax trees (ASTs), check task and effect semantics, and accept verified grafts (modifications) instead of blind text edits.

The language includes 19 implemented command-line tools (parse, format, check, run, ast, graph, query, lint, doctor, plan, fix, verify, deploy, trace, seal, zjx, graft, new) and supports module imports, task/type/effect declarations, explicit capability gates for effects, and deterministic host seeding for databases, secrets, deployments, spending, network calls, shell commands, and model calls without live external access.

Project scaffolding templates are available for hello, library, CLI, service, data pipeline, deploy, spend gate, agent, agent task pack, and multi-module agent projects through `sley new` with non-destructive generation.