diff --git a/docs/operator-apps.md b/docs/operator-apps.md
index 9e0911b..5a5dd8f 100644
--- a/docs/operator-apps.md
+++ b/docs/operator-apps.md
@@ -82,10 +82,19 @@ An operator view is declared inside workflow metadata:
 }
 ```
 
-Supported widgets are `image`, `status`, `metrics`, `fields`, and `actions`.
-Image, status, and metric widgets read live node output ports. Field widgets
-update declared node parameters. Actions can update parameters, cook a declared
-node output, or call a node's existing direct-control endpoint.
+Supported widgets are `image`, `viewer`, `status`, `metrics`, `fields`, and
+`actions`. Image, viewer, status, and metric widgets read live node output
+ports. A `viewer` embeds an HTTP(S) URL produced by a trusted workflow node and
+is intended for managed simulation, robot-scene, and other interactive browser
+surfaces. Field widgets update declared node parameters. Actions can update
+parameters, cook a declared node output, or call a node's existing
+direct-control endpoint.
+
+Use `input: "file_path"` for a path that must exist on the App host. It keeps
+the path editable and adds a **Browse…** button backed by Blacknode's filesystem
+browser. Declare `extensions` to filter selectable files, and optionally set
+`picker_title` and `button_label`. This is appropriate for robot descriptions,
+scenes, datasets, checkpoints, and other host-side artifacts.
 
 Sections render in the central workspace by default. Set a section's optional
 `region` to `parameters` to place its fields and actions in the right-side
diff --git a/docs/packages.md b/docs/packages.md
index c4b5742..4ce5c89 100644
--- a/docs/packages.md
+++ b/docs/packages.md
@@ -316,7 +316,7 @@ blacknode-ros2/
         __init__.py
         publish.py
   templates/               # optional workflow JSONs for the Templates tab
-  tests/                   # optional pytest suite, run with the core suite
+  tests/                   # optional package-specific test suite
   requirements.txt         # optional pip dependencies
   README.md
 ```
@@ -604,10 +604,11 @@ Category colors come from a module-level `BLACKNODE_CATEGORIES = {"ROS 2":
 
 ## Tests
 
-Running `pytest` from the Blacknode repo root collects `tests/` **and**
-`packages/*/tests/` — every installed package is tested together with the
-core. Keep package test filenames unique across packages (prefix them with
-the package name, e.g. `test_ros2_topics.py`) so module names don't collide.
+Running `pytest` from the Blacknode repo root collects the core `tests/` suite.
+Extension packages are independently versioned repositories and may require
+their own optional dependencies, environment setup, hardware, or managed
+services. Run a package's test command from that package worktree as documented
+in its `AGENTS.md`.
 
 Package tests can import the core (`blacknode.node`, test helpers) and the
 package's own modules via the stable alias:
diff --git a/editor/src/components/LocalFilePicker.tsx b/editor/src/components/LocalFilePicker.tsx
index c9902e2..bc9b748 100644
--- a/editor/src/components/LocalFilePicker.tsx
+++ b/editor/src/components/LocalFilePicker.tsx
@@ -76,7 +76,7 @@ export default function LocalFilePicker({
         <header>
           <div>
             <strong id="bn-local-file-picker-title">{title}</strong>
-            <span>Select a local {extensions.join(', ')} scene</span>
+            <span>Select a local {extensions.join(', ')} file</span>
           </div>
           <button type="button" onClick={onCancel} aria-label="Close file browser">×</button>
         </header>
@@ -118,7 +118,7 @@ export default function LocalFilePicker({
           {loading && <div className="bn-local-file-picker-message">Opening folder…</div>}
           {!loading && error && <div className="bn-local-file-picker-message is-error">{error}</div>}
           {!loading && !error && listing?.entries.length === 0 && (
-            <div className="bn-local-file-picker-message">No matching scene files or folders here.</div>
+            <div className="bn-local-file-picker-message">No matching files or folders here.</div>
           )}
           {!loading && !error && listing?.entries.map(entry => (
             <button
diff --git a/editor/src/components/WorkflowOperatorView.tsx b/editor/src/components/WorkflowOperatorView.tsx
index 87afc68..a40fd1c 100644
--- a/editor/src/components/WorkflowOperatorView.tsx
+++ b/editor/src/components/WorkflowOperatorView.tsx
@@ -10,6 +10,7 @@ import {
 } from 'react'
 
 import { useStore } from '../store'
+import LocalFilePicker from './LocalFilePicker'
 import type {
   OperatorActionItem,
   OperatorFieldItem,
@@ -134,6 +135,37 @@ function OperatorImage({ widget, nodes }: {
   )
 }
 
+function viewerUrl(value: unknown): string {
+  const candidates: unknown[] = [value]
+  if (value && typeof value === 'object') {
+    const record = value as Record<string, unknown>
+    candidates.push(record.viewer_url, record.url)
+  }
+  for (const candidate of candidates) {
+    if (typeof candidate !== 'string') continue
+    const trimmed = candidate.trim()
+    if (/^(https?:\/\/|\/(?!\/))/i.test(trimmed)) return trimmed
+  }
+  return ''
+}
+
+function OperatorViewer({ widget, nodes }: {
+  widget: Extract<OperatorWidget, { type: 'viewer' }>
+  nodes: ReturnType<typeof useStore.getState>['nodes']
+}) {
+  const url = viewerUrl(valueFor(widget.source, nodes))
+  return (
+    <article className="bn-operator-card bn-operator-viewer-card">
+      <header><strong>{widget.title}</strong><span className={url ? 'is-live' : ''}>{url ? 'LIVE' : 'WAITING'}</span></header>
+      <div className="bn-operator-viewer-frame">
+        {url
+          ? <iframe src={url} title={widget.title} allow="clipboard-read; clipboard-write; fullscreen" referrerPolicy="no-referrer" />
+          : <div className="bn-operator-image-empty"><i aria-hidden="true" />{widget.empty ?? 'Start the workflow to open this viewer.'}</div>}
+      </div>
+    </article>
+  )
+}
+
 function statusLabel(item: OperatorStatusItem, value: unknown): string {
   if (value === true) return item.true_label ?? 'Ready'
   if (value === false) return item.false_label ?? 'Not ready'
@@ -204,6 +236,7 @@ function OperatorField({ item }: { item: OperatorFieldItem }) {
   const updateParam = useStore(state => state.updateParam)
   const storedValue = node?.data.params?.[item.param]
   const [draft, setDraft] = useState(String(storedValue ?? ''))
+  const [filePickerOpen, setFilePickerOpen] = useState(false)
 
   useEffect(() => setDraft(String(storedValue ?? '')), [storedValue])
 
@@ -253,6 +286,16 @@ function OperatorField({ item }: { item: OperatorFieldItem }) {
     }
   }
 
+  const selectFilePath = async (path: string) => {
+    setDraft(path)
+    setFilePickerOpen(false)
+    try {
+      await updateTargets(path)
+    } catch (error) {
+      notice('error', `Could not update ${item.label}`, error instanceof Error ? error.message : String(error))
+    }
+  }
+
   const swapValues = async () => {
     if (item.confirm && !window.confirm(item.confirm)) return
     const pairs = item.swap_pairs ?? []
@@ -301,6 +344,42 @@ function OperatorField({ item }: { item: OperatorFieldItem }) {
     )
   }
 
+  if (item.input === 'file_path') {
+    return (
+      <div className="bn-operator-file-path-field">
+        <label>
+          <span>{item.label}</span>
+          <div className="bn-operator-file-path-control">
+            <input
+              type="text"
+              value={draft}
+              placeholder={item.placeholder}
+              onChange={event => setDraft(event.target.value)}
+              onBlur={() => void commit()}
+              onKeyDown={event => {
+                if (event.key !== 'Enter') return
+                event.preventDefault()
+                event.currentTarget.blur()
+              }}
+            />
+            <button type="button" onClick={() => setFilePickerOpen(true)}>
+              {item.button_label ?? 'Browse…'}
+            </button>
+          </div>
+        </label>
+        {filePickerOpen && (
+          <LocalFilePicker
+            title={item.picker_title ?? `Choose ${item.label}`}
+            initialPath={draft}
+            extensions={item.extensions ?? []}
+            onSelect={path => void selectFilePath(path)}
+            onCancel={() => setFilePickerOpen(false)}
+          />
+        )}
+      </div>
+    )
+  }
+
   const common = {
     value: draft,
     placeholder: item.placeholder,
@@ -425,6 +504,7 @@ function OperatorWidgetView({ widget, nodes, busyId, bindings, onRun }: {
   onRun: (item: OperatorActionItem) => void
 }) {
   if (widget.type === 'image') return <OperatorImage widget={widget} nodes={nodes} />
+  if (widget.type === 'viewer') return <OperatorViewer widget={widget} nodes={nodes} />
   if (widget.type === 'status') return <OperatorStatus widget={widget} nodes={nodes} />
   if (widget.type === 'metrics') return <OperatorMetrics widget={widget} nodes={nodes} />
   if (widget.type === 'fields') return <OperatorFields widget={widget} />
diff --git a/editor/src/index.css b/editor/src/index.css
index 9c684ee..5827e6b 100644
--- a/editor/src/index.css
+++ b/editor/src/index.css
@@ -6990,7 +6990,8 @@ button.bn-device-fact {
   text-transform: uppercase;
 }
 
-.bn-operator-image-card > header {
+.bn-operator-image-card > header,
+.bn-operator-viewer-card > header {
   display: flex;
   min-height: 36px;
   align-items: center;
@@ -6999,18 +7000,21 @@ button.bn-device-fact {
   border-bottom: 1px solid var(--line);
 }
 
-.bn-operator-image-card > header strong {
+.bn-operator-image-card > header strong,
+.bn-operator-viewer-card > header strong {
   font-size: 13px;
 }
 
-.bn-operator-image-card > header span {
+.bn-operator-image-card > header span,
+.bn-operator-viewer-card > header span {
   color: var(--tx3);
   font-size: 11px;
   font-weight: 800;
   letter-spacing: .1em;
 }
 
-.bn-operator-image-card > header span.is-live {
+.bn-operator-image-card > header span.is-live,
+.bn-operator-viewer-card > header span.is-live {
   color: var(--ok);
 }
 
@@ -7036,6 +7040,22 @@ button.bn-device-fact {
   object-fit: contain;
 }
 
+.bn-operator-viewer-frame {
+  display: grid;
+  min-height: 420px;
+  height: min(68vh, 760px);
+  overflow: hidden;
+  background: #05080d;
+  place-items: center;
+}
+
+.bn-operator-viewer-frame iframe {
+  width: 100%;
+  height: 100%;
+  border: 0;
+  background: #05080d;
+}
+
 .bn-operator-image-card.is-dashboard .bn-operator-image-frame img {
   display: block;
   height: auto;
@@ -7140,6 +7160,28 @@ button.bn-device-fact {
   gap: 4px;
 }
 
+.bn-operator-file-path-field {
+  min-width: 0;
+  grid-column: 1 / -1;
+}
+
+.bn-operator-file-path-control {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) auto;
+  gap: 6px;
+}
+
+.bn-operator-file-path-control button {
+  min-height: 36px;
+  padding: 7px 12px;
+  border: 1px solid var(--bn-operator-accent);
+  border-radius: 7px;
+  background: color-mix(in srgb, var(--bn-operator-accent) 10%, var(--lift));
+  color: var(--tx1);
+  cursor: pointer;
+  font: 700 12px var(--font-ui);
+}
+
 .bn-operator-swap-field {
   display: flex;
   min-width: 0;
diff --git a/editor/src/operatorView.ts b/editor/src/operatorView.ts
index 7eef5cc..6cf4fd1 100644
--- a/editor/src/operatorView.ts
+++ b/editor/src/operatorView.ts
@@ -29,9 +29,11 @@ export interface OperatorFieldItem {
   node_id: string
   param: string
   label: string
-  input?: 'text' | 'number' | 'textarea' | 'calibration_file' | 'swap'
+  input?: 'text' | 'number' | 'textarea' | 'file_path' | 'calibration_file' | 'swap'
   placeholder?: string
   button_label?: string
+  picker_title?: string
+  extensions?: string[]
   confirm?: string
   min?: number
   max?: number
@@ -81,6 +83,13 @@ export type OperatorWidget =
       empty?: string
       aspect?: 'video' | 'dashboard'
     }
+  | {
+      type: 'viewer'
+      id: string
+      title: string
+      source: OperatorValueSource
+      empty?: string
+    }
   | { type: 'status'; id: string; title?: string; items: OperatorStatusItem[] }
   | { type: 'metrics'; id: string; title?: string; items: OperatorMetricItem[] }
   | { type: 'fields'; id: string; title?: string; items: OperatorFieldItem[] }
@@ -133,7 +142,11 @@ export function isWorkflowOperatorView(value: unknown): value is WorkflowOperato
       && typeof item.node_id === 'string'
       && typeof item.param === 'string'
       && typeof item.label === 'string'
-      && (item.input === undefined || ['text', 'number', 'textarea', 'calibration_file', 'swap'].includes(String(item.input)))
+      && (item.input === undefined || ['text', 'number', 'textarea', 'file_path', 'calibration_file', 'swap'].includes(String(item.input)))
+      && (item.extensions === undefined || (
+        Array.isArray(item.extensions)
+        && item.extensions.every(extension => typeof extension === 'string')
+      ))
       && (item.apply_to === undefined || (
         Array.isArray(item.apply_to)
         && item.apply_to.every(target => isRecord(target) && typeof target.node_id === 'string' && typeof target.param === 'string')
diff --git a/pyproject.toml b/pyproject.toml
index 5517f78..056c074 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -54,11 +54,9 @@ where = ["python"]
 [tool.pytest.ini_options]
 # Collect only the real suite. Without this, a bare `pytest` (as CI runs) also
 # globs stray `*_test.py` dev scripts under scripts/, whose top-level code can
-# abort collection. The glob picks up the test suite of every extension
-# package cloned into packages/, so `pytest` from the repo root tests core and
-# installed packages together. Package test filenames must be unique across
-# packages (prefix them with the package name).
-testpaths = ["tests", "packages/*/tests"]
+# abort collection. Extension packages are independent repositories with their
+# own environments and test commands; run each package suite from its worktree.
+testpaths = ["tests"]
 
 # When the Rust core ships (roadmap milestone 2), restore the maturin backend:
 #   [build-system]
diff --git a/python/blacknode/package_index.py b/python/blacknode/package_index.py
index 5610dce..1476461 100644
--- a/python/blacknode/package_index.py
+++ b/python/blacknode/package_index.py
@@ -1107,6 +1107,7 @@
                     "default": True,
                     "node_types": [
                         "NewtonJointCommand",
+                        "NewtonScene",
                         "NewtonSimulation",
                         "NewtonUSDScene",
                         "NewtonViewerConfig",
@@ -1166,6 +1167,7 @@
                 "NewtonJointCommand",
                 "NewtonReplayBridge",
                 "NewtonROSBridge",
+                "NewtonScene",
                 "NewtonSimulation",
                 "NewtonUSDScene",
                 "NewtonViewerConfig",
diff --git a/tests/test_editor_operator_view.py b/tests/test_editor_operator_view.py
index fa90ce6..bb5cff9 100644
--- a/tests/test_editor_operator_view.py
+++ b/tests/test_editor_operator_view.py
@@ -19,8 +19,11 @@ def test_operator_view_contract_is_declarative_and_versioned():
     assert "region?: 'main' | 'parameters'" in contract
     assert "export type OperatorWidget" in contract
     assert "type: 'image'" in contract
+    assert "type: 'viewer'" in contract
     assert "type: 'fields'" in contract
     assert "type: 'actions'" in contract
+    assert "'file_path'" in contract
+    assert "extensions?: string[]" in contract
     assert "isWorkflowOperatorView" in contract
 
 
@@ -64,6 +67,36 @@ def test_editor_hides_builder_chrome_but_keeps_edit_workflow_escape_hatch():
     assert "Support the robot" in view
     assert ".bn-operator-view {" in styles
     assert ".bn-operator-image-frame" in styles
+    assert ".bn-operator-viewer-frame" in styles
+
+
+def test_operator_view_embeds_declared_interactive_viewer_urls():
+    view = (
+        ROOT / "editor" / "src" / "components" / "WorkflowOperatorView.tsx"
+    ).read_text(encoding="utf-8")
+    styles = (ROOT / "editor" / "src" / "index.css").read_text(encoding="utf-8")
+
+    assert "function OperatorViewer" in view
+    assert "if (widget.type === 'viewer')" in view
+    assert "if (/^(https?:\\/\\/|\\/(?!\\/))/i.test(trimmed))" in view
+    assert 'allow="clipboard-read; clipboard-write; fullscreen"' in view
+    assert 'referrerPolicy="no-referrer"' in view
+    assert ".bn-operator-viewer-frame iframe" in styles
+
+
+def test_operator_fields_can_browse_host_files():
+    contract = (ROOT / "editor" / "src" / "operatorView.ts").read_text(encoding="utf-8")
+    view = (
+        ROOT / "editor" / "src" / "components" / "WorkflowOperatorView.tsx"
+    ).read_text(encoding="utf-8")
+    styles = (ROOT / "editor" / "src" / "index.css").read_text(encoding="utf-8")
+
+    assert "picker_title?: string" in contract
+    assert "extensions?: string[]" in contract
+    assert "<LocalFilePicker" in view
+    assert "item.extensions ?? []" in view
+    assert "await updateTargets(path)" in view
+    assert ".bn-operator-file-path-control" in styles
 
 
 def test_operator_panels_use_consistent_compact_spacing_and_cyan_highlights():