OpenUI 0.5 — Native generative UI on Xano

The wire format is the render format

The previous Anything Engine (group 1270) returned a Crayon-shaped events [{event, data}] array that the Next.js BFF (sandbox) translated into OpenUI Lang for the <Renderer/>. That adapter — 513 LOC of strLit / posArgs / contactCardExpr / same-firm dedup / stale-not-implemented interception — duplicated across every consumer.

OpenUI 0.5 (group 1276 / canonical C5i2nPpF) collapses that. Each endpoint emits a fully-formed root = Root([...]) program ready for the Renderer. Banned-phrase lint, signal-taxonomy tag enforcement, and same-firm dedup run server-side. The legacy events[] shape is still emitted by /openui05/dispatch for sandbox-BFF compatibility — drop it once consumers migrate.

Eight endpoints, one base URL

Base: https://xh2o-yths-38lt.n7c.xano.io/api:C5i2nPpF

Front door + classifier

Tool endpoints (6 implemented)

find_investors chain (deck-aware retrieval)

Interview + summary + plumbing

Positional, functional, no JSX

The OpenUI Lang tokenizer treats < as a less-than operator, not an opening tag — there is no JSX grammar. Every program is an assignment list with a mandatory root. Component names are PascalCase. Arguments are positional in the order their Zod schema keys are defined.

# Multi-card find_investors response — what the find-X endpoints emit:

v0 = ScanningCard("Scanning investor universe", "graph_rag returned 3 candidates", 11948, 3, "complete")
v1 = ContactCard("Jane Smith", "Partner", "Founders Fund", "Leads Series A in regulated medtech", "Closed two FDA-cleared imaging deals in 2025; partner Cara Liu chairs the cardiology IC. [portfolio]", "", 0.87)
v2 = ContactCard("Bob Lee", "Principal", "a16z", "Fintech operator turned investor", "a16z's last six fintech checks tracked the same Series A band as your raise. [thesis]", "", 0.74)
root = Root([v0, v1, v2])

Positional signatures (from components.tsx Zod schemas)

Verbatim outputs (May 8 2026)

1. classify — class_override skip path

curl -X POST https://xh2o-yths-38lt.n7c.xano.io/api:C5i2nPpF/openui05/classify \
  -H "Content-Type: application/json" \
  -d '{"query":"anything","class_override":"find_investors"}'

{
  "class": "find_investors",
  "count": 25,
  "confidence": 1,
  "reasoning": "class_override supplied by caller",
  "raw": "",
  "skipped_routing": true,
  "openui_lang": null
}

2. classify — ask_back path emits a clarify program

curl -X POST https://xh2o-yths-38lt.n7c.xano.io/api:C5i2nPpF/openui05/classify \
  -d '{"query":"help me find people"}'

{
  "class": "ask_back",
  "count": 0,
  "confidence": 0.2,
  "reasoning": "Query is too vague. Are you looking for investors, talent, customers, ...?",
  "openui_lang": "root = Root([clarify])\nclarify = ErrorState(\"clarify\", \"Need a bit more to go on.\", \"Query is too vague. Are you looking for investors, talent, customers, ...?\")"
}

3. find-investors — Opus 4.1 + portfolio tag

curl -X POST https://xh2o-yths-38lt.n7c.xano.io/api:C5i2nPpF/openui05/find-investors \
  -d '{"query":"Series A enterprise SaaS investors","count":3}'

{
  "ok": true,
  "graph_count": 3,
  "synth_source": "anthropic",
  "investors": [
    {
      "name": "S3 Ventures",
      "thesis_summary": "S3 Ventures is the largest venture capital firm focused on Texas...",
      "why": "S3 Ventures has deployed capital into four healthcare technology companies in recent rounds... Their co-investor network includes specialized healthcare funds like Vensana Capital and Omega Funds, suggesting comfort with complex technical sales cycles typical of enterprise SaaS. [portfolio]",
      "match_score": 0.63
    }, ...
  ],
  "lint_dropped": [],
  "openui_lang": "v0 = ScanningCard(\"Scanning investor universe\", \"graph_rag returned 3 candidates\", 11948, 3, \"complete\")\nv1 = ContactCard(\"S3 Ventures\", null, ...)\nroot = Root([v0, v1, v2, v3])"
}

4. dispatch — full end-to-end

curl -X POST https://xh2o-yths-38lt.n7c.xano.io/api:C5i2nPpF/openui05/dispatch \
  -d '{"query":"Series A medtech investors","class_override":"find_investors","requested_n":3}'

{
  "ok": true,
  "classification": {"class": "find_investors", "confidence": 1, ...},
  "events": [
    {"event": "text", "data": "Routed -> find_investors. class_override supplied by caller"},
    {"event": "tpl", "data": {"name": "scanning_card", "templateProps": {...}}},
    {"event": "tpl", "data": {"name": "contact_card", "templateProps": {...}}}, ...
  ],
  "openui_lang": "v0 = ScanningCard(...)\nv1 = ContactCard(\"MedVenture Partners\", ..., \"...backed CorVista Health through Series C... [co-investor]\", null, 0.41)\n...\nroot = Root([v0, v1, ...])",
  "latency_ms": 17234
}

The lint pass that prompts can't be trusted to enforce

Sandbox case 13 (Sequoia regression) and the deck-context "Orbiter.io" leak both proved that prompt-only enforcement of voice rules is unreliable under recency load. OpenUI 0.5 runs a deterministic post-synthesis lint pass per find-X endpoint:

• Banned-phrase regex. A WHY paragraph containing any of ride shotgun, tee up, lock the [deal/round/intro/seat/engagement], playbook, nine-figure, multi-hundred-million, before someone else, worth a [N]-min call, let's get on a call, I'd love to introduce you, no-brainer, synergy, win-win, great question, happy to help, or Orbiter.io is dropped from the response.
• Signal taxonomy tag check. find-investors WHYs MUST end with one of [portfolio] / [co-investor] / [board] / [thesis]. Missing tag = card dropped. The frontend renders the tag as a separate chip below the WHY paragraph (Portfolio match · Co-investor · Board overlap · Thesis match).
• Same-firm dedup. Multiple cards with identical company values collapse to a single card with the highest match_score as primary; the others append as a "+ N other (Name Role)" byline.
• No placeholder data. If both Anthropic and OpenRouter fail to synthesize a WHY, the card is omitted — never a "Verification pending" stub. Mark's rule from May 7: scaffold ≠ deliverable.
• Stale not_implemented interception. Dispatch's else branch surfaces a NoMatchesCard explaining the class is being scoped — replaces internal "X classes pending" plumbing strings with user-facing copy.

The full lint pass + dedup + Lang assembly runs in three Xano api.lambda blocks chained inside each find-X endpoint. ~30ms total cost over a ~22s synthesis call.

Haiku 4.5 for routing, Opus 4.1 for find_investors WHYs

Per prompts/_shared/model-selection.md:

• Haiku 4.5 — classify, interview, build-summary, thesis-extract. Cheap, fast, good enough.
• Opus 4.1 — find_investors WHY synthesis only. The factual rigor needed to write defensible portfolio-match paragraphs (with bracket tag enforcement) justifies the cost.
• OpenRouter Llama 3.3 70B (Fireworks → Together preferred providers, allow_fallbacks: true) — resilience tier. Fires automatically when Anthropic returns non-200 or empty content.

The classifier and interviewer NEVER block dispatch on fallback failure — they degrade to ask_back with a clarify card. find-X endpoints drop cards rather than ship degraded WHYs.

Three lines, one Renderer

// src/features/anything-engine/openui/anything-engine-canvas-openui.tsx
import { Renderer } from "@openuidev/react-lang";
import { openui05DispatchFn } from "../server/openui05-dispatch-fn";
import { anythingEngineLibrary } from "./components";

const result = await openui05DispatchFn({
  data: { query, requested_n: 20, thread_id: SESSION_THREAD_ID },
});

return <Renderer response={result.openui_lang} library={anythingEngineLibrary} />;

The previous crayon-to-openlang.ts adapter (320 LOC) is deleted. The canvas no longer touches events[] at all — server is the source of truth for the rendered shape.

Verified live in the network-tab Anything Engine canvas (/network?active-view=anything-engine): clicking the Find investors tile fires openui05DispatchFn, which calls /openui05/dispatch. The response's openui_lang string feeds straight into <Renderer/>. ContactCards render with Portfolio match tag chips, italic thesis summary bylines, and indigo match score pills. End-to-end latency: ~22s for find_investors at count=3.

The honest gap list

• The 9 not-yet-wired classes (find_deal_flow, make_purchase, purchase_real_estate, find_cofounder, find_collaborators, find_acquisition, find_speakers, find_job, get_advice) currently fall through to the dispatch else branch and surface a NoMatchesCard explaining scoping is in progress. Mark's interview prompts exist for 8 of 9 — purchase_real_estate still needs an interview.md.
• The /openui05/dispatch tool_calls[] handler currently logs update_pitch_profile calls with status deferred_to_fn_12918. The actual write+re-embed is wired through Xano fn 12918 in the next iteration.
• The pitch-profile chain (/anything-engine/pitch-profile, /prefilter, /final-trim from group 1270) is not yet ported to OpenUI 0.5 native. The new find-investors works in fallback-only mode (no chain). For full deck-aware retrieval, the legacy 1270 endpoints still fire when suggestion_request_id is set.
• 15 of 18 polish-bar templates from polish-bar-inventory.md (outcome_card, leverage_loop_card, meeting_prep_card, meeting_goal_card, memory_card, serendipity_card, button_group, submit_button, error_card, question_card, question_card_enhanced, quick_result_card, loading_indicator, interview_card, dispatch_confirmation) are not yet registered in the OpenUI 0.5 component library. Wrappers are scoped — they import the existing copilot Crayon templates and translate positional args → props.
• AlloyDB ScaNN migration is still gated on Mark's instance — find-investors runs against FalkorDB today.