Sley 1.x Legacy / Apache-2.0
Sley 1.x Legacy
The complete human-readable line: self-hosted, open source, with published release evidence. Sley 1.2.1 is the final 1.x release; new work happens in Sley 2, the machine-native language and system for AI agents.
Sley 1.x · complete · Apache-2.0
Sley 1.x is complete, and it stays open
The human-readable architecture is finished, and v1.2.1 is its final release, for Linux x86_64. The self-hosted 1.x compiler owns its parser, checker, lint, runtime, bootstrap and reports, all written in Sley.
Sley 1.x was agent-native from the start, with structural inspection (AST, graph slices, queries), planned edits, deterministic receipts and authority gates. Sley 2 builds on that workflow. Both lines are Apache-2.0; Sley 2 lives at sley-lang/sley.
Release evidence
Sley 1.2 by the numbers
Recorded on v1.2.0 (2026-08-27) and carried into the final v1.2.1 release.
- 38 release targets · 99 report schemas · 187 contract fixtures · 72 corpus cases · 264 integration checks · 11 release-packet checks · 4 public-release checks
- The self-hosted compiler passes the full verification suite and ships with a local CLI
- Sensitive host actions pass through deterministic authority gates
38 / 38release targets
99report schemas
187 / 187contract fixtures
264 / 264integration checks
When to use Sley 1.x Legacy
- You already run Sley 1.x programs
- You want structural workflows over human-readable source
- You want to study, experiment with, or fork the self-hosted 1.x compiler
When to use Sley 2
- New work where AI agents change code through typed state and validated transactions
- Projects that need explicit policy, capability tokens and native branches with receipts
- Sley 2.1.8 (Apache-2.0) ships a machine-first
sley CLI and a self-hosted toolchain
sley-lang/sley · Quickstart · Docs · How it works · FAQ · Sley Arena
Evidence
How to cite Sley 1.x
Cite Sley 1.x with its public evidence packet, claim manifest, prior-art source pack and language specification.
Legacy questions
Common questions about Sley 1.x
Is Sley 1.x still available?
Yes. Sley 1.x lives at GreyforgeLabs/sley-legacy under Apache-2.0; v1.2.1 is its final release, for Linux x86_64. Existing users, researchers and forks are welcome.
Is Sley 1.x compatible with Sley 2?
No. Sley 2 is a clean break, rebuilt from the ground up for machines. Sley 1.x programs stay on the 1.x line. The Chronicle explains why.
Why Sley 2: the Chronicle
Sley