diff --git a/sdk/src/gsd-transport.ts b/sdk/src/gsd-transport.ts
index 3857d2886..eecea7238 100644
--- a/sdk/src/gsd-transport.ts
+++ b/sdk/src/gsd-transport.ts
@@ -55,7 +55,7 @@ export class GSDTransport {
     } else {
       const reason = this.subprocessReason(request, policy);
       onDecision?.({ dispatchMode: 'subprocess', reason });
-      if (!policy.allowFallbackToSubprocess) {
+      if (!policy.allowFallbackToSubprocess && reason === 'native_unregistered') {
         throw GSDToolsError.failure(
           `Subprocess fallback disabled: command '${request.registryCommand}' cannot run without native dispatch`,
           request.legacyCommand,
diff --git a/sdk/src/index.ts b/sdk/src/index.ts
index d9e8f811a..5e83fc430 100644
--- a/sdk/src/index.ts
+++ b/sdk/src/index.ts
@@ -50,6 +50,8 @@ export class GSD {
   private readonly defaultMaxTurns: number;
   private readonly autoMode: boolean;
   private readonly workstream?: string;
+  private readonly strictSdk?: boolean;
+  private readonly allowFallbackToSubprocess?: boolean;
   readonly eventStream: GSDEventStream;
 
   constructor(options: GSDOptions) {
@@ -62,6 +64,8 @@ export class GSD {
     this.defaultMaxTurns = options.maxTurns ?? 50;
     this.autoMode = options.autoMode ?? false;
     this.workstream = options.workstream;
+    this.strictSdk = options.strictSdk;
+    this.allowFallbackToSubprocess = options.allowFallbackToSubprocess;
     this.eventStream = new GSDEventStream();
   }
 
@@ -128,6 +132,16 @@ export class GSD {
       workstream: this.workstream,
       eventStream: this.eventStream,
       sessionId: this.sessionId,
+      strictSdk: this.strictSdk,
+      allowFallbackToSubprocess: this.allowFallbackToSubprocess,
+      onDispatchEvent: (event) => {
+        this.eventStream.emitEvent({
+          type: GSDEventType.StreamEvent,
+          timestamp: new Date().toISOString(),
+          sessionId: this.sessionId ?? '',
+          event,
+        });
+      },
     });
   }
 
diff --git a/sdk/src/runtime-bridge-options.test.ts b/sdk/src/runtime-bridge-options.test.ts
new file mode 100644
index 000000000..443aaae0f
--- /dev/null
+++ b/sdk/src/runtime-bridge-options.test.ts
@@ -0,0 +1,33 @@
+import { describe, it, expect } from 'vitest';
+import { GSD } from './index.js';
+import { GSDEventType, type GSDEvent } from './types.js';
+
+describe('GSD runtime bridge options', () => {
+  it('strictSdk option is honored by createTools dispatch seam', async () => {
+    const gsd = new GSD({
+      projectDir: process.cwd(),
+      strictSdk: true,
+      allowFallbackToSubprocess: true,
+      sessionId: 'test-session',
+    });
+
+    const events: GSDEvent[] = [];
+    gsd.onEvent((event) => events.push(event));
+
+    await expect(gsd.createTools().exec('nonexistent-command', [])).rejects.toThrow(
+      "Strict SDK mode: command 'nonexistent-command' has no native adapter",
+    );
+
+    const streamEvent = events.find((event) => event.type === GSDEventType.StreamEvent);
+    expect(streamEvent).toBeDefined();
+    expect(streamEvent).toMatchObject({
+      type: GSDEventType.StreamEvent,
+      sessionId: 'test-session',
+      event: {
+        type: 'query_dispatch',
+        command: 'nonexistent-command',
+        outcome: 'error',
+      },
+    });
+  });
+});
diff --git a/sdk/src/types.ts b/sdk/src/types.ts
index b57b07363..f0958e648 100644
--- a/sdk/src/types.ts
+++ b/sdk/src/types.ts
@@ -203,6 +203,10 @@ export interface GSDOptions {
    * Optional session correlation id for query mutation events when using {@link GSD.createTools}.
    */
   sessionId?: string;
+  /** Strict SDK runtime bridge mode: fail fast when a query command has no native adapter. */
+  strictSdk?: boolean;
+  /** Explicit subprocess fallback policy for the runtime bridge. Default false. */
+  allowFallbackToSubprocess?: boolean;
   /** Model to use for execution sessions. */
   model?: string;
   /** Maximum budget per plan execution in USD. Default: 5.0. */