feat(frontend): agent chat streaming slice + RAG example demo

[mmabrouk]

What this is

This ports the AgentChatSlice frontend and the RAG_QA_chatbot example from fe-feat/agent-streaming-slice onto the restructured agent branches. It adds the slice (web/oss/src/components/AgentChatSlice), the agent-chat page route (oss + ee), the three npm deps it needs (ai, @ai-sdk/react, @ant-design/x-markdown), the NEXT_PUBLIC_AGENT_CHAT_* env flags, and the example backend.

Note to Arda

Your branch carried the whole agent feature, not just the frontend. While you were building the chat slice, the agent backend was restructured into a stack of focused functional PRs (#4771 to #4777). So the backend, docs, and playground controls on your branch are now an older, pre-refactor copy of work those PRs supersede. To avoid regressing them, this PR takes only the parts that are genuinely yours and new: the frontend slice and the example. Nothing else from your branch is included.

What moved, so you can re-point any imports:

• The harness/runtime that lived in services/oss/src/harness/* is now in the SDK at sdks/python/agenta/sdk/agents/ (ports + adapters). See feat(sdk): agent runtime behind backend/harness ports #4771.
• services/agent/src/tools/client.ts is now callback.ts. See feat(agent): runner wire contract and tool execution #4773.
• services/oss/src/agent/tools.py is now a tools/ package. See feat(agent): agent workflow service and tool-resolution API #4772.
• The agent-workflows docs were reorganized. Current state is in docs/design/agent-workflows/ground-truth.md; the old POCs moved under trash/. See docs(agent): agent-workflows design and ground truth #4777.

The slice's wire contract (transport.ts against the /messages Vercel stream) lines up with the backend in #4772 (the agent service) and #4771 (the SDK messages adapter), so it should run against the current backend unchanged.

How to run

• pnpm install in web/ for the new deps.
• Set NEXT_PUBLIC_AGENT_CHAT_API to your agent /messages endpoint.
• Open the agent-chat page.

Stacking and review notes

• This is stacked on feat(frontend): agent config playground controls #4775 (the agent config playground UI). The backend it talks to is feat(sdk): agent runtime behind backend/harness ports #4771 and feat(agent): agent workflow service and tool-resolution API #4772.
• The ported files were committed as-is from your branch, so the lint/format hook was bypassed. A pnpm lint-fix pass is expected before merge.

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Project	Deployment	Actions	Updated (UTC)
agenta-documentation	Ready	Preview, Comment	Jun 19, 2026 8:02pm

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Updated at 2026-06-19T20:11:15.354Z