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Open Source

Sley

Sley is an agent-native structural programming language for compiler-mediated, human-reviewed software change.

Built around structure-first semantics, Sley makes intent explicit, durable, and cheap to reason over across repeated agent-assisted cycles. World-first category wording is bounded by the public evidence and prior-art source packets.

What you get

Language-First Agent Workflows

Sley is built as a first-class language surface for agent-assisted engineering: explicit structure, bounded context, and machine-verifiable intent.

Token-Efficient by Design

By preserving intent in structure instead of prose, Sley reduces repeated prompt reconstruction and makes large changes more understandable to both humans and models.

Readable, Inspectable Systems

Sley surfaces explicit contracts, durable state boundaries, and verifiable execution context for safer collaboration between operators and agents.

Why Sley

Agent-native code organization for agent orchestration and planning systems.

Tool integration surfaces with verifiable execution plans and traceable side effects.

Research and production workflows that need recoverable, auditable state under review.

Current status

  • May 18 pause checkpoint keeps the local v1 gate green.
  • Selected result and deterministic authority-gate output paths now have broader Sley-owned semantic coverage.
  • Strict self-hosting and final public release promotion remain blocked claims.