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lukasmoschitz
eca1d741c8
## Summary
Aligns the **langgraph-fastapi** showcase integration to the north-star
**langgraph-python** (OSS-582 — "Align LangGraph (FastAPI) Showcase
demos and code"). Moves the integration onto the product-centric demo
set: backend agent graphs, runtime wiring, frontend chrome, the
demo-browser overview (`manifest.yaml`), and aimock fixtures.
Linear: OSS-582.
## What changed
**Backend agents (`src/agents/src/`)**
- Ported the missing dedicated graphs: `agentic_chat`, `gen_ui_agent`,
`gen_ui_tool_based`, `shared_state_streaming`.
- v2 `create_agent` ports + config alignment for `agent_config_agent`,
`headless_complete`, `reasoning_agent`, `tool_rendering_agent`,
`tool_rendering_reasoning_chain_agent`, `a2ui_dynamic`.
**Runtime wiring**
- `route.ts`: wired the canonical demos to their dedicated graphs and
removed them from the generic `sample_agent` fallthrough loop (this is
what made several demos behave correctly against a real LLM — see
below); added `recursion_limit`.
- `langgraph.json`: registered the 3 new graphs.
- Renamed the dedicated API routes
`copilotkit-byoc-{hashbrown,json-render}` →
`copilotkit-declarative-{hashbrown,json-render}`.
**Overview / content**
- `manifest.yaml`: demos + features aligned to LGP (names, descriptions,
tags, order, canonical ids; deprecated aliases migrated; phantom
`hitl-in-chat-booking` removed; `shared-state-streaming` un-quarantined
now that it works). Integration identity (name/slug/logo) preserved. The
demo-browser overview is now card-for-card identical to
langgraph-python.
- Restored two missing `@region` markers (factory-automation snippet
extraction).
**Frontend chrome**
- `globals.css`, `layout.tsx`, `middleware.ts` (was missing),
`declarative-gen-ui/*` + `sales-context.ts`, `beautiful-chat`;
`Dockerfile` now copies `manifest.yaml` (fixed an RSC crash on every
`/demos/*`).
**aimock fixtures (`aimock/d4|d6/langgraph-fastapi/`)**
- D6 fixture fixes for the previously-red cells (stale `turnIndex`
gates, cross-file substring shadowing, missing `chunkSize`, prompt
narrowing).
**Showcase tooling / docs**
- Fixed harness services racing on a shared image tag
(`docker-compose.local.yml`).
- `GOTCHAS.md` #8: documents that aimock D6 can be green while a demo is
broken against a real LLM (fixtures replay scripted tool calls
regardless of which graph ran), plus how to catch it.
- `PARITY_NOTES.md`: sanctioned divergences (a2ui-recovery per-slug
prompt isolation; declarative-json-render scoped-test divergence).
## Verification
- **D6 sweep: 38 green / 1 red.** The single red is **a2ui-recovery**,
which reproduces **identically on the north star** (shared Python
`ag_ui_langgraph` recovery loop; mastra's TS impl is green). It is not a
fastapi defect and is tracked as a separate PR against the north star.
Documented in `PARITY_NOTES.md`.
- `validate-manifests` (manifest → registry, all 20 integrations) —
green.
- `validate-routes --all` (runtime-route wiring) — green.
- Build + TypeScript typecheck (`next build` via the Docker image build)
— green.
- `@region` audit — all region pairs balanced and LGP-consistent (0
orphans/typos/mismatches).
- Live manual QA against real OpenAI (`:3102` vs `:3100`) confirmed the
key demos (reasoning-custom, shared-state-streaming, gen-ui-tool-based,
agentic-chat).
## Notable finding
Several demos were D6-green but broke against a real model because they
fell back to the generic `sample_agent` instead of their dedicated graph
— the aimock fixture masked the wiring bug by replaying scripted tool
calls. This PR fixes the wiring and documents the gap (GOTCHAS #8).
D6-green is necessary but not sufficient for graph/tool-dependent demos;
a real-LLM click-through is required.
## Deferred / follow-ups
- **a2ui-recovery** — shared north-star defect in the Python
`ag_ui_langgraph` recovery loop; separate PR against the north star.
- **d5-byoc probe** — always sends the hashbrown pill even on the
json-render page (fleet-wide harness limitation); tracked as a
follow-up. The gating `byoc` grid cell is green.
## Scope note
Only `langgraph-fastapi` integration code, its aimock fixtures, and
showcase tooling/docs changed. **langgraph-python (the north star) was
not touched.**