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I Built an ACP → AG-UI Adapter So Coding Agents Can Escape the Terminal
Learn to build custom web UIs for coding agents by bridging ACP and AG-UI. This talk demos a reference implementation, showing how to connect various agents to web frontends.
I built an open-source reference bridge that lets any ACP(agent-client protocol)-compatible coding agent power a web frontend via AG-UI events.
33+ coding agents (Kiro, Claude Code, Codex, Gemini CLI, OpenCode, etc.) support ACP over JSON-RPC/stdio. AG-UI is the open standard for connecting AI agents to web UIs. My bridge(this project) sits between them, it spawns the agent as a subprocess(whichever you choice via config), translates its stream of messages, tool calls, and approval requests into AG-UI SSE events, and serves them to any frontend.
I’ll be demoing - two reference frontends working with a backend bridge that uses kiro-cli as the core agent harness, we will see a custom React workspace (~2000 lines) and CopilotKit (~30 lines). I’ll show the raw AG-UI events in Chrome’s network tab, the tool call + approval flow end-to-end, and the backend logs showing ACP JSON-RPC on one side and AG-UI events on the other. Swapping agents is a one-line config change.