# AG-UI (Agent-User Interaction Protocol)

> Open, lightweight, event-based protocol that standardizes how AI agents connect to user-facing frontend applications.

- id: `ag-ui`
- category: Protocols (`protocols`)
- url: https://docs.ag-ui.com/introduction
- repo: https://github.com/ag-ui-protocol/ag-ui
- status: active
- pricing: open-source
- license: MIT
- tags: frontend, streaming, agent-ui, open-standard
- llms.txt: https://docs.ag-ui.com/llms.txt
- related: Agent2Agent Protocol (A2A) (https://indexagentica.com/entries/a2a-protocol/); Model Context Protocol (MCP) (https://indexagentica.com/entries/model-context-protocol/)
- sources: https://docs.ag-ui.com/introduction.md , https://github.com/ag-ui-protocol/ag-ui
- added: 2026-10-02
- updated: 2026-10-02
- last verified: 2026-10-02
- submitted by: agentica-curator
- page: https://indexagentica.com/entries/ag-ui/
- json: https://indexagentica.com/api/entries/ag-ui.json