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feat(frontend): agent generation in the playground + observability - #4810
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Ports the AgentChatSlice frontend (ai-sdk useChat over the agent /messages stream) and the RAG_QA_chatbot example onto the current functional agent branches. See the PR description for the note to Arda.
The agent-chat slice transport relied on the server defaulting to a stream. The real /messages endpoint only streams when the client sends Accept: text/event-stream; otherwise it returns a batch JSON body, which useChat cannot render. Send the SSE Accept header so streamed assistant replies show up.
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Frontend layer for agent workflows, stacked on the agent chat slice (#4780). Playground: - AgentChatPanel as the third generation arm; buildAgentRequest + per-entity isAgentMode; multi-session tabs, attachments, conversation rewind; streaming over the v6 /messages contract (SSE). - Rendering: markdown (tables, headings, code highlight, LaTeX), collapsible thinking, tool cards, streamed usage/cost, failed-run error surfaced from the trace. - Session history picker; open-a-session-from-observability deep link. Observability: - Sessions table renders cell data (page-store context) + real height + id truncation. - Agent reply shown in Last output, session-drawer conversation, and Traces Outputs (read the nested agent span, not the root's streamed-generator repr). - Open-in-Playground replays an agent run from its root span (agent chat, not completion). Agent config controls are taken verbatim from #4775; AgentConfigControl additionally wires gatewayTools (Composio) into the tool picker (2-line delta on top of #4775).
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What
Frontend layer for agent generation in the playground + the agent observability fixes.
Stacks on the agent chat slice (#4780):
fe-feat/agent-chat-ui-slice→feat/agent-playground-ui(#4775) →big-agents(#4791) →main.FE-only diff (54 files, all
web/).Playground
AgentChatPanelas the third generation arm;buildAgentRequest+ per-entityisAgentMode; multi-session tabs, attachments, conversation rewind; streaming over the v6/messagescontract (SSE).Observability
agentspan instead of the root span's streamed-generator repr.Agent config controls
Taken verbatim from #4775 (
AgentConfigControl,McpServerItemControl,SchemaPropertyRenderer,SchemaControls/index.ts,CreateApp*,iconHelpers,appUtils) — byte-identical, so they drop out of the diff once the stack is wired. The only delta is a 2-line gateway-tools wiring onAgentConfigControl(passesgatewayToolsto the tool picker so Composio tools show), on top of #4775's version.Not in this PR
fix/agent-session-id-tracing. (Two optional small SDK fixes — generator-repr guard, v6 finish-part — exist on the working branch if wanted.)Parked follow-up
"Open in Playground" from an agent trace opens an empty agent config — needs a committed agent revision with refs on its spans (or a builtin agent schema). Tracked in
docs/design/agent-workflows/.