ETAS: An Effect-Typed Language for Agent Systems
ETAS is a programming language for agent systems that treats model-backed agents, tool calls, prompts, typed memory, human approvals, policies, and execution traces as semantic program elements rather than library conventions. It separates deterministic computation from agentic nondeterminism and externally visible actions while preserving a direct programming style. We present the core design of ETAS. Its static semantics assigns ordinary types through spec conformance and tracks each computation with two behavioral indices: an escaping effect row and a persistent abstraction of the typed action trace it may request. Specs form a terminating compile-time constraint calculus: type specs p...
| Authors | Huiri Tan, Yikun Wang, Puyang Zhang et al. |
|---|---|
| Primary category | cs.PL |
| Published | 20 July 2026 |
| Last updated at source | 20 July 2026 |
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