feat(agent): OpenUI bindings — library/fragment builders, toUIOutput, getUiStream() (DEV-773) by LukasParke · Pull Request #92 · OpenRouterTeam/typescript-agent

LukasParke · 2026-07-31T21:05:35Z

Summary

The Agent-SDK half of the OpenUI backport from Noetic (DEV-773, part of the DEV-765 umbrella; spec: DEV-764 RFC).

Deliberately thin per the spec: the API owns parsing/prompting/validation; the SDK ships builders, the tool render surface, and stream access.

New `src/lib/openui/` module

defineComponent / createLibrary — component vocabulary from Zod prop schemas; prop declaration order is normative (positional args in OpenUI Lang map by order)
fragment(library) + uiRef/uiState/uiBuiltin — typed constructors for tool-authored UI; literal props validated at construction time
openui(library) — produces the wire-shaped {id:'openui', library, dialect} plugin preference (Zod → JSON Schema); plugins already type-flows through CallModelInput, so no callModel signature change
translateUiEvent + UI stream event model

`tool()` render surface

Optional toUIOutput sibling of toModelOutput on regular/generator/HITL tools
Successful executions broadcast a tool.ui_fragment stream event (render-only — never sent to the model; throwing toUIOutput degrades to no-fragment)

`ModelResult.getUiStream()`

Streams UI events across all turns: tool-authored fragments + the API's response.openui.statement/fragment/document wire events
Wire events not yet in the SDK's stream-event union arrive via its forward-compat Unknown catch-all; translation reads the raw payload, so the stream works before and after the SDK regen (DEV-772)
Implements both the no-tools fast path (with hooks-session finalization) and the multi-turn broadcaster path

Deferred (documented in the ticket)

uiSubmitted()/uiInteracted()/uiToAssistant() stop predicates — need interaction events that only exist once Phase-3 surface state (DEV-774) lands
Items-stream surfacing of UI events; fragments on the auto-approve/pending-state paths

Test plan

28 new tests (openui.test.ts, openui-stream.test.ts): serialization, library ordering/validation, fragment builder, plugin wire shape, event translation (incl. Unknown encoding), getUiStream fast path, broadcastUiFragment success/skip/throw paths
Full suite: 774/774 passing (62 files), typecheck + biome clean

🤖 Generated with Claude Code

API example

import {
  callModel,
  createLibrary,
  defineComponent,
  fragment,
  openui,
  tool,
} from '@openrouter/agent';
import { z } from 'zod/v4';

const library = createLibrary([
  defineComponent({
    name: 'Text',
    props: z.object({ value: z.string() }),
  }),
]);

const ui = fragment(library);
const greeting = tool({
  name: 'greeting',
  inputSchema: z.object({ name: z.string() }),
  execute: ({ name }) => ({ message: `Hello, ${name}!` }),
  toUiOutput: ({ output }) => ui.Text(output.message),
});

const result = callModel(client, {
  model: 'anthropic/claude-sonnet-4.5',
  input: 'Greet Luke',
  tools: [greeting],
  plugins: [openui(library)],
});

for await (const event of result.getUiStream()) {
  if (event.type === 'fragment') {
    console.log(event.source);
  }
}

…r (DEV-773) The SDK half of the OpenUI backport from Noetic (DEV-765). Adds packages/agent/src/lib/openui/: defineComponent/createLibrary (Zod props with normative declaration order), the typed fragment() builder with uiRef/uiState/uiBuiltin, OpenUI Lang expression serialization, and the openui(library) helper producing the wire-shaped plugin preference (Zod -> JSON Schema). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

…Stream() (DEV-773) Tools can now author OpenUI render fragments: an optional toUIOutput sibling of toModelOutput on every executable tool shape. Fragments are broadcast as tool.ui_fragment stream events after successful execution (render-only, never sent to the model; a throwing toUIOutput degrades to no-fragment). getUiStream() on ModelResult surfaces UI events across all turns: tool-authored fragments plus the API's response.openui.* wire events (statement/fragment/document) from the openui plugin. Wire events not yet in the SDK's stream-event union arrive via its forward-compat Unknown catch-all, so translation reads the raw payload — the stream works both before and after the SDK regen (DEV-772). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

New private package @openrouter/openui-playground: a local webapp for testing, benching, and evaluating OpenUI generative-UI support. - Progressive renderer over the demo component library (Stack/Card/ Heading/Text/Stat/Badge/Table/Input/Select/Button/Progress) — UI materializes statement-by-statement mid-stream - Two modes with identical event shapes: emulate (local library prompt + reference streaming parser over the text stream — works today) and native (openui() plugin + getUiStream() — flips on when DEV-771/772 land), so the paths can be A/B'd from the history table - Bench stats per run: TTFB, first-statement latency, total time, statement/diagnostic counts, token usage, cost; session history for comparing models and prompts - Reference incremental OpenUI Lang parser (the same logic DEV-770 ports into openrouter-web) with 11 conformance tests - Plain node:http + static client; no build step Verified end-to-end against live models: single-card and 12-statement dashboard prompts parse clean (0 diagnostics) and render progressively. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

serializeExpr emitted object keys raw, so a key with spaces, quotes, punctuation, or a leading digit produced source the parser rejects. Keys come from arbitrary tool-authored objects via toExpr, so they cannot be assumed to be identifiers. The grammar already accepts a quoted key (parseObject branches on '"'), so quoting the rest round-trips. String(NaN)/String(Infinity) also emitted bare identifiers, which parse back as refs to undefined names. JSON resolves the same hole as null; do that rather than emit source that cannot round-trip. fix(playground): describe enum props by their values, not "string" describeSchema returned on json.type before checking json.enum, but an enum serializes as {type: 'string', enum: [...]} — so every enum prop was described to the model as a plain string and it never saw which values are legal for Badge.tone, Stack.direction, Button.variant. docs(changeset): add the required minor changeset for the OpenUI exports ~30 new exports plus ModelResult.getUiStream and the toUIOutput tool option had no changeset, which the public-api-examples skill requires. The example is compile-checked against the real signatures.

The gate's no_god_files rule is fan-out > 15, not file size: model-result.ts sat at exactly 15 outbound edges and this PR's ./openui/ui-stream.js import made it 16. Verified by removing that one import — the violation disappears. Re-exported UiStreamEvent and translateUiEvent from stream-transformers.js, which model-result.ts already depends on and which owns every other wire-event translation the loop performs, so no new edge is added. Complex functions were 9 -> 13, all four new here. Each is split along a seam it already had: - translateUiEvent: one function per wire event type (cc=18 -> under) - scanStatements: string-literal and bracket-depth state machines extracted - generate: the native path's per-variant event mapping extracted - renderCall: form controls and Table extracted to renderControl/renderTable Verified with sentrux 0.5.7, the version CI pins: God files 0 -> 0, complex functions back to 9 (the 9 remaining are all pre-existing on main and untouched), gate reports 'No degradation detected'. Behavior unchanged — full suite green, typecheck and lint clean.

The table of what each stream emits is the reference consumers use to pick one; getUiStream was absent.

…escript-agent-openui-module-libraryfragment-builders

synapse-github-agent · 2026-08-03T23:29:11Z

cortex review — `6898806`

✅ Security · ⚠️ Experience (DX · UX · A11y) — incomplete · ⚠️ Performance — incomplete

Experience (DX · UX · A11y)

⚠️ Review incomplete for this category (failed — Invalid final response: empty or invalid output) — findings may be missing.

Performance

⚠️ Review incomplete for this category (failed — Invalid final response: empty or invalid output) — findings may be missing.

✔ 4 resolved since last push

uiRef / uiState / uiBuiltin names are serialized into OpenUI Lang source with no identifier validation. The serializer deliberately hardens every other value channel — strings go through JSON.stringify, non-identifier object keys are quoted, non-finite numbers become null (packages/agent/src/lib/openui/document.ts:64-113) — but ref/state/builtin names are emitted verbatim (case 'ref': return expr.name). A toUIOutput implementation that derives a ref from its input (which is model-controlled tool arguments) lets a malicious/injected model break out of the literal quoting and inject arbitrary expressions into the fragment, e.g. uiRef('x), @Run(dangerous_mutation'), which downstream renderers parse as extra action steps in what the client treats as trusted tool-authored UI. Validate names against /^[A-Za-z_][A-Za-z0-9_]*$/ at construction time. (packages/agent/src/lib/openui/fragment.ts:69)
Model-controlled parser diagnostics are interpolated into innerHTML unescaped → DOM XSS. d.source is passed through escapeHtml, but d.message beside it is not, and diagnostic messages embed raw model text: ExprParser.parseComplete throws trailing content after expression: '${this.src.slice(this.pos)}' (packages/openui-playground/src/lang/parser.ts) with the remainder of the model's line, and unexpected character '${ch}' / expected identifier at '...' do the same. A model output line such as a = Text("x") <img src=x onerror=...> becomes a diagnostic whose message contains the tag, which is then written into the document via innerHTML. Any prompt-injected or malicious model response therefore executes script in the playground origin — the same origin that can POST /api/generate with the server's API key. Same class at packages/openui-playground/public/app.js:447, where the user-supplied h.model string is interpolated into the history table's innerHTML. Fix: run every interpolated field through escapeHtml (or build the nodes with textContent). (packages/openui-playground/public/app.js:572)
API-key-backed generation endpoint listens on all interfaces with no auth or origin check. server.listen(PORT, …) defaults to 0.0.0.0, so anyone on the same network (café/office LAN, container host) can POST /api/generate with an arbitrary prompt/system/model and spend the developer's OPENROUTER_API_KEY (packages/openui-playground/src/server.ts:29-36); there is no rate limit or body-size cap on the path either (readBody, server.ts:58-65). Bind explicitly to 127.0.0.1 for a local-only tool. (packages/openui-playground/src/server.ts:190)
Static-file guard uses a bare string prefix check, so sibling directories escape the public root. normalize(join(PUBLIC_DIR, rel)) followed by file.startsWith(PUBLIC_DIR) accepts .../openui-playground/public-anything/...: a request for /../public.bak/secret resolves outside public/ yet still passes the prefix test and is served. Compare against PUBLIC_DIR + path.sep (or use path.relative and reject results starting with ..). (packages/openui-playground/src/server.ts:94)

_{Automatic first-pass review · updated in place on every push}

Two findings from cortex's review pass. XSS: the diagnostics panel escaped `source` but interpolated `message` and `line` raw into innerHTML. Every field there is model-controlled — `ParseFailure.message` is built from the offending source line, and in native mode diagnostics arrive verbatim off the wire — so a model could inject markup by emitting a crafted statement. All three fields are now escaped. A11y: rendered Input/Select carried no accessible name, so a screen reader announced an unlabelled field. Both signatures already have a `name` prop that was going unused for labelling; it now sets aria-label (and the real `name` attribute), falling back to the placeholder for Input.

synapse-github-agent

cortex panel verdict: comment — details in the consolidated review comment.

- escape diagnostic messages and history model names before innerHTML (XSS) - bind playground server to 127.0.0.1 (API-key-backed endpoint) - require trailing separator in static-file public-root prefix check - validate uiRef/uiState/uiBuiltin names as identifiers at construction - aria-label form controls from their name prop; progressbar ARIA + text % - aria-live status/diagnostics regions; error frames no longer overwritten by the green 'done' status - rename toUIOutput -> toUiOutput (match Ui casing convention pre-release) - warn (tool name + call id) when toUiOutput throws instead of catch {} - collect toUiOutput broadcasts and await as one batch off the follow-up critical path - sticky regexes + charCode skipWs in the playground parser (was O(n^2)) - memoize openui(library) wire shape per library (WeakMap) - drop the playground's no-op build script / outDir

…yfragment-builders' of https://github.com/OpenRouterTeam/typescript-agent into lukeparke/dev-773-typescript-agent-openui-module-libraryfragment-builders-2 # Conflicts: # packages/openui-playground/public/app.js

synapse-github-agent

cortex panel verdict: approve — details in the consolidated review comment.

…dule-libraryfragment-builders

synapse-github-agent · 2026-08-04T02:31:02Z

⚠️ cortex keep-fresh: could not auto-merge packages/agent/src/index.ts (resolver produced a line not present on any side: --- context after this hunk ---). Manual update needed; label cortex-merge-conflict added.

synapse-github-agent · 2026-08-04T02:32:45Z

⚠️ cortex keep-fresh: could not auto-merge packages/agent/src/lib/tool.ts (resolver produced a line not present on any side: Assistant). Manual update needed; label cortex-merge-conflict added.

synapse-github-agent · 2026-08-04T02:33:16Z

⚠️ cortex keep-fresh: could not auto-merge packages/agent/src/index.ts (resolver produced a line not present on any side: --- context after this hunk ---). Manual update needed; label cortex-merge-conflict added.

synapse-github-agent · 2026-08-04T02:45:35Z

⚠️ cortex keep-fresh: could not auto-merge packages/agent/src/lib/model-result.ts (resolver produced a line not present on any side: C: Analyze the semantics of both sides and combine them.). Manual update needed; label cortex-merge-conflict added.

synapse-github-agent · 2026-08-04T02:48:27Z

⚠️ cortex keep-fresh: could not auto-merge packages/agent/src/index.ts (resolver produced a line not present on any side: --- context after this hunk ---). Manual update needed; label cortex-merge-conflict added.

synapse-github-agent · 2026-08-04T03:00:32Z

⚠️ cortex keep-fresh: could not auto-merge packages/agent/src/lib/model-result.ts (resolver produced a line not present on any side:
). Manual update needed; label cortex-merge-conflict added.

synapse-github-agent · 2026-08-04T03:07:52Z

⚠️ cortex keep-fresh: could not auto-merge packages/agent/src/lib/model-result.ts (resolver produced a line not present on any side:
). Manual update needed; label cortex-merge-conflict added.

synapse-github-agent · 2026-08-04T03:10:16Z

⚠️ cortex keep-fresh: could not auto-merge packages/agent/src/lib/model-result.ts (resolver produced a line not present on any side:
). Manual update needed; label cortex-merge-conflict added.

synapse-github-agent · 2026-08-04T03:11:05Z

⚠️ cortex keep-fresh: could not auto-merge packages/agent/src/lib/model-result.ts (resolver produced a line not present on any side:
). Manual update needed; label cortex-merge-conflict added.

synapse-github-agent · 2026-08-04T03:28:07Z

⚠️ cortex keep-fresh: could not auto-merge packages/agent/src/lib/tool.ts (resolver produced a line not present on any side: --- context after this hunk ---). Manual update needed; label cortex-merge-conflict added.

synapse-github-agent · 2026-08-04T14:52:07Z

⚠️ cortex keep-fresh: could not auto-merge packages/agent/src/lib/model-result.ts (resolver produced a line not present on any side: 答案需要合并两侧：OURS 添加了 broadcastUiFragment 方法，THEIRS 添加了 handleAsyncInvocation 等一系列方法). Manual update needed; label cortex-merge-conflict added.

synapse-github-agent · 2026-08-04T14:52:08Z

⚠️ cortex keep-fresh: could not auto-merge packages/agent/src/lib/tool.ts (resolver produced a line not present on any side: Assistant... need to interleave alphabetically: ToUiOutputFunction, then Unified). Manual update needed; label cortex-merge-conflict added.

synapse-github-agent · 2026-08-04T16:53:58Z

⚠️ cortex keep-fresh: could not auto-merge packages/agent/src/index.ts (resolver produced a line not present on any side: ToolTaskHandle,). Manual update needed; label cortex-merge-conflict added.

synapse-github-agent · 2026-08-04T16:59:40Z

⚠️ cortex keep-fresh: could not auto-merge packages/agent/src/index.ts (resolver produced a line not present on any side: Ours and theirs are independent additions; interleave alphabetically: ToolTaskHa). Manual update needed; label cortex-merge-conflict added.

synapse-github-agent · 2026-08-04T17:03:13Z

⚠️ cortex keep-fresh: could not auto-merge packages/agent/src/index.ts (resolver produced a line not present on any side: ToolTaskHandle,). Manual update needed; label cortex-merge-conflict added.

synapse-github-agent · 2026-08-04T17:07:43Z

⚠️ cortex keep-fresh: could not auto-merge packages/agent/src/index.ts (resolver produced a line not present on any side: ToolTaskHandle,). Manual update needed; label cortex-merge-conflict added.

synapse-github-agent · 2026-08-04T17:08:28Z

⚠️ cortex keep-fresh: could not auto-merge packages/agent/src/index.ts (resolver produced a line not present on any side: ToolTaskHandle,). Manual update needed; label cortex-merge-conflict added.

synapse-github-agent · 2026-08-04T17:36:54Z

⚠️ cortex keep-fresh: could not auto-merge packages/agent/src/index.ts (resolver produced a line not present on any side: ToolTaskHandle,). Manual update needed; label cortex-merge-conflict added.

# Conflicts: # packages/agent/README.md # packages/agent/src/index.ts # packages/agent/src/lib/model-result.ts # packages/agent/src/lib/tool-types.ts # packages/agent/src/lib/tool.ts # pnpm-lock.yaml

devin-ai-integration · 2026-08-03T19:05:11Z

+      let base = evalExpr(expr.base, depth + 1);
+      for (const key of expr.path) {
+        base = base !== null ? base[key] : null;
+      }
+      return base;


🟡 Playground stops rendering and shows an error when generated UI reads a nested field that is missing

A nested field lookup keeps drilling into a value that turned out to be missing (base[key] at packages/openui-playground/public/app.js:95) instead of stopping, so a generated screen that reads a two-level field the data does not have aborts the whole run with an error.

Impact: A perfectly valid model response (e.g. the data.rows.title form the playground's own prompt teaches) can kill the live render and leave the page stuck on an error message.

Mechanism: undefined intermediate in the member-path loop

evalExpr for kind: 'member' guards only against null: base = base !== null ? base[key] : null. The first hop frequently produces undefined — e.g. data = Query(...) makes the ref branch return the raw call expression object (packages/openui-playground/public/app.js:100), so expr['rows'] is undefined; the second hop then evaluates undefined['title'] and throws a TypeError.

The throw propagates out of renderSurface() → handleEvent() → the for loop inside run()'s try, which catches it, calls setStatus(..., true) and stops consuming the SSE stream, so all remaining statements/stats for that run are dropped. The library prompt explicitly instructs the model to use member access with paths like data.rows.title (packages/openui-playground/src/lang/prompt.ts:60), so this is easy to hit.

Suggested change

let base = evalExpr(expr.base, depth + 1);

for (const key of expr.path) {

base = base !== null ? base[key] : null;

}

return base;

let base = evalExpr(expr.base, depth + 1);

for (const key of expr.path) {

base = base === null || base === undefined ? null : base[key];

}

return base;

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devin-ai-integration · 2026-08-03T19:05:13Z

+  const rel = urlPath === '/' ? 'index.html' : urlPath.slice(1);
+  const file = normalize(join(PUBLIC_DIR, rel));
+  if (!file.startsWith(PUBLIC_DIR)) {
+    sendJson(res, 404, {
+      error: 'not found',
+    });
+    return;
+  }


🟨 Static file guard can be bypassed by a sibling directory name prefix

The static handler resolves the requested path and then only checks file.startsWith(PUBLIC_DIR) (packages/openui-playground/src/server.ts:95). Because PUBLIC_DIR has no trailing separator, a request such as /../public-notes/secret.txt resolves to <pkg>/public-notes/secret.txt, which still passes the prefix test, letting the dev server read files outside the intended public/ directory.

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LukasParke and others added 2 commits July 31, 2026 15:53

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LukasParke added 4 commits August 3, 2026 13:59

docs(agent): list getUiStream in the README stream table

e5759d3

The table of what each stream emits is the reference consumers use to pick one; getUiStream was absent.

Merge remote-tracking branch 'origin/main' into lukeparke/dev-773-typ…

4eb82c7

…escript-agent-openui-module-libraryfragment-builders

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LukasParke added the cortex-keep-updated cortex keeps this PR up to date with its base branch label Aug 3, 2026

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LukasParke added 2 commits August 3, 2026 19:07

Merge branch 'lukeparke/dev-773-typescript-agent-openui-module-librar…

6898806

…yfragment-builders' of https://github.com/OpenRouterTeam/typescript-agent into lukeparke/dev-773-typescript-agent-openui-module-libraryfragment-builders-2 # Conflicts: # packages/openui-playground/public/app.js

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Merge branch 'main' into lukeparke/dev-773-typescript-agent-openui-mo…

20ab446

…dule-libraryfragment-builders

synapse-github-agent Bot added the cortex-merge-conflict cortex could not auto-merge; manual update needed label Aug 4, 2026

LukasParke removed cortex-merge-conflict cortex could not auto-merge; manual update needed cortex-keep-updated cortex keeps this PR up to date with its base branch labels Aug 6, 2026

Merge remote-tracking branch 'origin/main' into wt/pr92

20c0e5c

# Conflicts: # packages/agent/README.md # packages/agent/src/index.ts # packages/agent/src/lib/model-result.ts # packages/agent/src/lib/tool-types.ts # packages/agent/src/lib/tool.ts # pnpm-lock.yaml

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fix(openui): address review findings

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refactor(openui): simplify native diagnostics counting

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LukasParke added 4 commits August 11, 2026 14:29

fix(agent): bound OpenUI fragment rendering

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fix(openui): finish review feedback

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fix(openui): release timed-out UI renders

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fix(openui): drain renders added before close

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fix(agent): drain UI fragments before stream completion

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LukasParke added 2 commits August 11, 2026 16:23

fix(agent): isolate UI stream lifecycle

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fix(agent): release exited UI consumers

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fix(agent): merge OpenUI event streams

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fix(agent): render deferred tool UI results

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LukasParke commented Jul 31, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Summary

New src/lib/openui/ module

tool() render surface

ModelResult.getUiStream()

Deferred (documented in the ticket)

Test plan

API example

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cortex review — 6898806

Experience (DX · UX · A11y)

Performance

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LukasParke commented Jul 31, 2026 •

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New `src/lib/openui/` module

`tool()` render surface

`ModelResult.getUiStream()`

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cortex review — `6898806`