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Effect Uai

Effect Uai is an open-source TypeScript project of low-level, typed streaming primitives for building AI agents with Effect. Its components normalize model-turn events and provide tools for composing agent loops, while developers retain control of application state and workflow policy.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Effect Uai — OpenViST project profile in Agent Frameworks.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use it when building a TypeScript agent application where you want reusable model and tool primitives but need to own the state and orchestration decisions.

Who it is for

  • TypeScript developers building agentic AI applications with Effect.
  • Teams that want to define their own agent state, tool handling and loop policies.

Documented uses

  • Stream a model turn and process its text, reasoning and tool events.
  • Apply application-defined approval rules to model-requested tool calls.
  • Run typed tools, append their results to state and continue a model interaction.
  • Use components for retrieval, search, reading, speech or sandbox-related workflows.
Before you choose

Requirements & limits

The repository is public and displays an MIT license. Its README labels the project experimental and warns that minor releases during 0.x may include breaking changes.

  • The project supplies primitives rather than a complete framework or agent runtime; the application owns its loop and state.
  • The README describes OpenAI Responses, Anthropic, Gemini and OpenAI-compatible gateways normalizing to a shared TurnEvent union.
  • The core package lists model, tool, retrieval-adjacent, search, browser, sandbox, speech and generation interfaces; provider-specific support should be checked against the individual package documentation.
  • The project is experimental, and 0.x minor releases may contain breaking changes.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Install effect-uai core with the OpenAI Responses provider

Add the core agent-building primitives, OpenAI Responses provider layer, and Effect runtime to a project using pnpm.

Before you start

  • A project using pnpm.

Steps

  1. Open a terminal in the project.

  2. Run pnpm add @effect-uai/core @effect-uai/responses effect.

Expected outcome

The project has the core package, the OpenAI Responses provider layer, and the Effect runtime installed for building an agent loop.

Guide limitations

  • This documents installation only; it does not cover implementing or running an agent.
  • The project is in 0.x, where minor releases may include breaking changes.
Documentation 1 ↗Documentation 2 ↗
Evidence and transparency

Sources & review

Official repository ↗Guide documentation ↗
Source record details
Source availability
Active
Sources checked
14 October 2026
Original website title
betalyra/effect-uai · Official homepage title · retained in its source language
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