diff --git a/packages/eve-browser-lowering/dist/index.d.ts b/packages/eve-browser-lowering/dist/index.d.ts
index 51d9a3d..c86b57a 100644
--- a/packages/eve-browser-lowering/dist/index.d.ts
+++ b/packages/eve-browser-lowering/dist/index.d.ts
@@ -158,6 +158,7 @@ export declare class EveBrowserProviderHost {
     private submit;
     private consumeCommandResult;
     private presentCommandStatus;
+    private loweringOptions;
 }
 export interface EveEmbeddedDocumentRequest {
     documentId: string;
diff --git a/packages/eve-browser-lowering/dist/index.js b/packages/eve-browser-lowering/dist/index.js
index 7d9b624..ee41823 100644
--- a/packages/eve-browser-lowering/dist/index.js
+++ b/packages/eve-browser-lowering/dist/index.js
@@ -111,19 +111,7 @@ export class EveBrowserProviderHost {
             if (version === this.lastSurfaceVersion)
                 return;
             this.lastSurfaceVersion = version;
-            renderEveSurface(surface, this.host, {
-                activeSurfaceId: this.selected.surfaceId,
-                assetUrlResolver: this.transport.resolveAssetUrl,
-                body: this.options.body,
-                clientId: this.options.clientId || "eve-browser",
-                commandSink: intent => this.submit(intent),
-                documentResolver: this.transport.resolveDocument,
-                provider: this.provider,
-                pluginAdapters: this.pluginAdapters,
-                source: this.options.source,
-                statusElement: this.options.statusElement,
-                draftStore: this.draftStore,
-            });
+            renderEveSurface(surface, this.host, this.loweringOptions());
         }
         catch (error) {
             if (this.options.statusElement) {
@@ -171,15 +159,24 @@ export class EveBrowserProviderHost {
         region.replaceChildren(el("p", "eve-command-result-message", message));
         const projection = transient;
         if (projection?.surface?.root) {
-            region.append(renderEveComponent(projection.surface.root, {
-                activeSurfaceId: projection.surface.id || this.selected?.surfaceId,
-                clientId: this.options.clientId,
-                draftStore: this.draftStore,
-                pluginAdapters: this.pluginAdapters,
-                provider: this.provider,
-            }));
+            region.append(renderEveComponent(projection.surface.root, scopeEveBrowserOptions(projection, this.loweringOptions())));
         }
     }
+    loweringOptions() {
+        return {
+            activeSurfaceId: this.selected?.surfaceId,
+            assetUrlResolver: this.transport.resolveAssetUrl,
+            body: this.options.body,
+            clientId: this.options.clientId || "eve-browser",
+            commandSink: intent => this.submit(intent),
+            documentResolver: this.transport.resolveDocument,
+            provider: this.provider,
+            pluginAdapters: this.pluginAdapters,
+            source: this.options.source,
+            statusElement: this.options.statusElement,
+            draftStore: this.draftStore,
+        };
+    }
 }
 function requireCommandCapability(surface) {
     if (!surface.worldInteraction?.commandBoundary || !surface.worldInteraction.receiptSchema) {
diff --git a/packages/eve-browser-lowering/docs/host-authority.md b/packages/eve-browser-lowering/docs/host-authority.md
index 2a8a6bb..7acbb41 100644
--- a/packages/eve-browser-lowering/docs/host-authority.md
+++ b/packages/eve-browser-lowering/docs/host-authority.md
@@ -28,6 +28,9 @@ Derived state:
 - local drafts and the latest command-result region are renderer-owned
   transients; refresh may replace the surface projection but may not erase a
   receipt before the player can perceive it;
+- a provider-owned transient projection inherits the selected logical
+  surface's advertised command boundary while retaining its own command
+  descriptors and component context;
 - loaded font stylesheets are a document resource cache, not active-surface
   state.
 
@@ -42,6 +45,8 @@ Shared paths:
 
 - initial render, embedded render, plugin render, binding updates, command
   creation, and asset resolution all receive the same host-scoped context;
+- retained and command-result projections use the same host transport options;
+  a transient presentation surface ID never becomes command-routing authority;
 - initial binding hydration and live binding watches use the same component
   projection replacement primitive.
 - operation capture resolves edited drafts first and otherwise uses the
@@ -63,4 +68,6 @@ Verification:
 - untouched select and numeric defaults are present in captured operations;
 - accepted and denied command results remain visible after authoritative
   refresh;
+- controls inside a transient command-result projection invoke its descriptor
+  through the selected provider surface and canonical command sink;
 - disposing or rerendering one host cannot unsubscribe the other.
diff --git a/packages/eve-browser-lowering/src/index.ts b/packages/eve-browser-lowering/src/index.ts
index efa7e8a..335e173 100644
--- a/packages/eve-browser-lowering/src/index.ts
+++ b/packages/eve-browser-lowering/src/index.ts
@@ -269,19 +269,7 @@ export class EveBrowserProviderHost {
       const version = `${surface.providerId || ""}:${surface.surface?.id || ""}:${surface.version ?? ""}`;
       if (version === this.lastSurfaceVersion) return;
       this.lastSurfaceVersion = version;
-      renderEveSurface(surface, this.host, {
-        activeSurfaceId: this.selected.surfaceId,
-        assetUrlResolver: this.transport.resolveAssetUrl,
-        body: this.options.body,
-        clientId: this.options.clientId || "eve-browser",
-        commandSink: intent => this.submit(intent),
-        documentResolver: this.transport.resolveDocument,
-        provider: this.provider,
-        pluginAdapters: this.pluginAdapters,
-        source: this.options.source,
-        statusElement: this.options.statusElement,
-        draftStore: this.draftStore,
-      });
+      renderEveSurface(surface, this.host, this.loweringOptions());
     } catch (error) {
       if (this.options.statusElement) {
         this.options.statusElement.textContent = error instanceof Error ? error.message : "Eve surface unavailable.";
@@ -334,15 +322,28 @@ export class EveBrowserProviderHost {
     region.replaceChildren(el("p", "eve-command-result-message", message));
     const projection = transient as EveSurfaceDocument | undefined;
     if (projection?.surface?.root) {
-      region.append(renderEveComponent(projection.surface.root, {
-        activeSurfaceId: projection.surface.id || this.selected?.surfaceId,
-        clientId: this.options.clientId,
-        draftStore: this.draftStore,
-        pluginAdapters: this.pluginAdapters,
-        provider: this.provider,
-      }));
+      region.append(renderEveComponent(
+        projection.surface.root,
+        scopeEveBrowserOptions(projection, this.loweringOptions()),
+      ));
     }
   }
+
+  private loweringOptions(): EveBrowserLoweringOptions {
+    return {
+      activeSurfaceId: this.selected?.surfaceId,
+      assetUrlResolver: this.transport.resolveAssetUrl,
+      body: this.options.body,
+      clientId: this.options.clientId || "eve-browser",
+      commandSink: intent => this.submit(intent),
+      documentResolver: this.transport.resolveDocument,
+      provider: this.provider,
+      pluginAdapters: this.pluginAdapters,
+      source: this.options.source,
+      statusElement: this.options.statusElement,
+      draftStore: this.draftStore,
+    };
+  }
 }
 
 function requireCommandCapability(surface: EveProviderSurfaceAdvertisement): void {
diff --git a/packages/eve-browser-lowering/test/host-isolation.test.mjs b/packages/eve-browser-lowering/test/host-isolation.test.mjs
index b759aba..efca89e 100644
--- a/packages/eve-browser-lowering/test/host-isolation.test.mjs
+++ b/packages/eve-browser-lowering/test/host-isolation.test.mjs
@@ -1,7 +1,7 @@
 import assert from "node:assert/strict";
 import test from "node:test";
 import { JSDOM } from "jsdom";
-import { EveBrowserDraftStore, renderEveSurface } from "../dist/index.js";
+import { EveBrowserDraftStore, EveBrowserProviderHost, renderEveSurface } from "../dist/index.js";
 
 function installDom() {
   const dom = new JSDOM("<!doctype html><html><head></head><body><div id='a'></div><div id='b'></div></body></html>", {
@@ -433,3 +433,114 @@ test("authoritative refresh preserves the renderer-owned accessible command resu
     restoreDom();
   }
 });
+
+test("transient projection controls use the selected provider command boundary", async () => {
+  const restoreDom = installDom();
+  try {
+    const host = document.querySelector("#a");
+    const commands = [];
+    const descriptor = (command, payloadSchema) => ({
+      schema: "gamecult.eve.command.v1",
+      command,
+      payloadSchema,
+    });
+    const surfaceDocument = {
+      type: "surface-state",
+      schema: "gamecult.eve.surface.v1",
+      providerId: "ghostlight",
+      providerKind: "narrative.simulation",
+      title: "Ghostlight",
+      version: 7,
+      updatedAtUtc: "2026-08-22T00:00:00Z",
+      surface: {
+        id: "ghostlight.play",
+        styles: {},
+        root: {
+          id: "root",
+          kind: "control.button",
+          props: { label: "Assess", command: "world.assess" },
+          children: [],
+        },
+      },
+      commands: [descriptor("world.assess", "ghostlight.player_action_assess.v1")],
+    };
+    const transientProjection = {
+      type: "surface-state",
+      schema: "gamecult.eve.surface.v1",
+      providerId: "ghostlight",
+      providerKind: "narrative.simulation.command-result",
+      title: "Assessment",
+      version: 7,
+      updatedAtUtc: "2026-08-22T00:00:01Z",
+      surface: {
+        id: "ghostlight.command-result",
+        styles: {},
+        root: {
+          id: "roll",
+          kind: "control.button",
+          props: {
+            label: "Roll the d20",
+            command: "world.attempt",
+            action: { assessment_digest: "sha256:assessment" },
+          },
+          children: [],
+        },
+      },
+      commands: [descriptor("world.attempt", "ghostlight.player_action_attempt.v1")],
+    };
+    const receipt = command => ({
+      schema: "gamecult.eve.command_receipt.v1",
+      receiptId: `receipt:${command}`,
+      commandId: `command:${command}`,
+      command,
+      state: "accepted",
+      ownerRepo: "GameCult/Ghostlight",
+      authority: "WorldKernel",
+      providerId: "ghostlight",
+      surfaceId: "ghostlight.play",
+      message: "accepted",
+      diagnostics: [],
+      issuedAtUtc: "2026-08-22T00:00:02Z",
+      sourceVersion: 7,
+    });
+    const transport = {
+      providerAdvertisement: async () => ({
+        providerId: "ghostlight",
+        surfaces: [{
+          surfaceId: "ghostlight.play",
+          worldInteraction: {
+            commandBoundary: "ghostlight.eve.commands",
+            receiptSchema: "gamecult.eve.command_result.v1",
+          },
+        }],
+      }),
+      surface: async () => surfaceDocument,
+      submitCommand: async intent => {
+        commands.push(intent);
+        return {
+          schema: "gamecult.eve.command_result.v1",
+          receipt: receipt(intent.operation.operationId),
+          ...(intent.operation.operationId === "world.assess" ? { transientProjection } : {}),
+        };
+      },
+    };
+    const providerHost = new EveBrowserProviderHost(host, transport, { pollMs: 0 });
+    await providerHost.start();
+
+    host.querySelector("button").click();
+    await new Promise(resolve => setTimeout(resolve, 0));
+    const roll = host.querySelector(".eve-command-result-region button");
+    assert.equal(roll.textContent, "Roll the d20");
+    roll.click();
+    await new Promise(resolve => setTimeout(resolve, 0));
+
+    assert.deepEqual(commands.map(command => command.operation.operationId), ["world.assess", "world.attempt"]);
+    assert.equal(commands[1].surfaceId, "ghostlight.play");
+    assert.equal(commands[1].operation.schemaId, "ghostlight.player_action_attempt.v1");
+    assert.equal(commands[1].commandBoundary, "ghostlight.eve.commands");
+    assert.equal(commands[1].payload.assessment_digest, "sha256:assessment");
+    providerHost.stop();
+  } finally {
+    restoreDom();
+  }
+});