Langroid showcase — parity notes

Tracks demos from the canonical showcase/integrations/langgraph-python/manifest.yaml that are either deliberately skipped or deferred for the Langroid integration.

Canonical list: 36 demos (excluding cli-start).

Ported

Wave 1 (initial scaffold)

• agentic-chat
• hitl-in-chat (route: /demos/hitl)
• tool-rendering
• gen-ui-tool-based
• gen-ui-agent
• shared-state-read-write
• shared-state-streaming
• subagents

Wave 2 (chat chrome + reasoning)

• chat-customization-css
• prebuilt-sidebar
• prebuilt-popup
• chat-slots
• headless-simple
• frontend-tools
• frontend-tools-async
• hitl-in-app
• agentic-chat-reasoning
• reasoning-default-render
• readonly-state-agent-context

Wave 3 (batch B4 second pass)

• tool-rendering-default-catchall
• tool-rendering-custom-catchall
• declarative-gen-ui (A2UI dynamic schema — reuses agent's generate_a2ui tool)
• auth (dedicated /api/copilotkit-auth route with onRequest hook)
• headless-complete (frontend-only, reuses unified runtime)
• agent-config (frontend + dedicated route + backend wired end-to-end; forwardedProps.config.configurable.properties steers the agent's system prompt per run)

Wave 4 (showcase-fill-186)

• cli-start (informational manifest entry — npx copilotkit@latest init --framework langroid)
• gen-ui-tool-based (manifest entry only — frontend already shipped in Wave 1; the agent's generate_haiku frontend tool was the missing manifest link)
• hitl-in-chat (frontend-only — useHumanInTheLoop with a book_call tool defined client-side; the Langroid agent calls it via the same AG-UI runtime path as any other tool)
• hitl-in-chat-booking (alias of hitl-in-chat, identical route — mirrors the langgraph-python manifest where both demos point at the same page)

Skipped — Langroid lacks the framework primitive

• gen-ui-interrupt — uses useLangGraphInterrupt + LangGraph's interrupt() node + Command(resume=...) lifecycle. Langroid has no equivalent interrupt primitive and the current AG-UI adapter emits no interrupt events.
• interrupt-headless — same reason as gen-ui-interrupt.
• mcp-apps — the LangGraph showcase relies on the runtime mcpApps: { servers: [...] } middleware to inject MCP-server-backed tools into the agent at request time. Langroid's custom AG-UI adapter goes directly to the OpenAI Chat Completions API with a static tool list built from ALL_TOOLS, so the runtime-level tool injection never reaches the LLM. Porting requires a Langroid-aware AG-UI adapter that consumes the runtime-injected tool descriptors per turn.

Deferred — portable in principle, requires additional agent or runtime work

Each of these is achievable but needs a dedicated Langroid agent tool / module that we did not take on in this pass. They are tracked so a follow-up can pick them up without re-litigating scope.

• tool-rendering-reasoning-chain — needs the Langroid AG-UI adapter to emit reasoning events; the current adapter only emits text + tool deltas.
• a2ui-fixed-schema — needs a dedicated agent that loads JSON schemas at startup and exposes a display_flight-shaped tool backed by the same A2UI middleware path.
• byoc-json-render — needs a Langroid agent that streams structured JSON matching the @json-render/react Zod catalog, plus a dedicated BYOC runtime route.
• byoc-hashbrown — needs a Langroid agent that streams structured output matching the hashbrown schema, plus a dedicated BYOC runtime route.
• beautiful-chat — polished starter chat. Large frontend (example-layout, example-canvas, generative-ui charts, hooks). Requires combining openGenerativeUI + a2ui on one dedicated runtime route.
• multimodal — needs a Langroid agent configured with a vision-capable LLM and a dedicated runtime that accepts CopilotChat attachments (images + PDFs).
• voice — needs the @copilotkit/voice plumbing plus a dedicated voice runtime route and sample audio assets.
• open-gen-ui — needs a Langroid agent that emits a generateSandboxedUi tool call; the runtime openGenerativeUI middleware converts that stream into activity events.
• open-gen-ui-advanced — same agent surface as open-gen-ui plus host-side sandboxFunctions wiring on the frontend.
• mcp-apps — Langroid does ship an MCP client surface, but the canonical demo is tightly coupled to the LangGraph activity-message emission path. A Langroid port needs a custom AG-UI adapter path that emits the MCP-apps activity events.

Known limitations

(none currently tracked — previous agent-config backend gap was closed by propagating upstream PR #4271's forwardedProps repack + backend system- prompt wiring.)