Lukas Moschitz bf2de51705 fix(showcase): wire langgraph-fastapi demos to dedicated graphs (drop sample_agent fallbacks) ...

Live QA surfaced demos that behaved wrong on fastapi because they fell back to
the generic sample_agent (or were unregistered) instead of the dedicated graph
LGP uses. aimock D6 masked these (fixtures script the tool calls), so they were
green in the grid but broken against a real model. Audit of fastapi's
agentNames fallthrough vs LGP's neutralAssistantCells found exactly these:

- gen-ui-tool-based: port gen_ui_tool_based graph (tools=[], frontend supplies
  render_bar/pie_chart via useComponent). Was sample_agent, whose query_data
  tool + prompt made the model loop on data queries instead of rendering.
- shared-state-streaming: port shared_state_streaming graph (StateStreaming
  middleware + write_document tool + document state). Was sample_agent, which
  never emits state.document, so it only wrote to chat. Remove from
  not_supported_features (now works, D6 green).
- agentic-chat: port agentic_chat graph (tools=[]). Was sample_agent (7+ tools).
- threadid-frontend-tool-roundtrip: wire to frontend_tools (was unregistered).
- reasoning-custom: align reasoning_agent config to LGP (gpt-5.4 / effort
  medium / summary detailed; were gpt-5-mini / low / auto).

Register the 3 new graphs in langgraph.json; remove the 3 names from the
sample_agent fallthrough loop in route.ts. D6 green x2 for reasoning-display,
gen-ui-custom, shared-state-streaming, agentic-chat; agent-config +
tool-rendering-reasoning-chain re-verified (no regression).

2026-07-27 16:24:50 +02:00

2.1 KiB

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