diff --git a/sdk/src/query-runtime-bridge.test.ts b/sdk/src/query-runtime-bridge.test.ts
index 903ec3f2b..cb9233c90 100644
--- a/sdk/src/query-runtime-bridge.test.ts
+++ b/sdk/src/query-runtime-bridge.test.ts
@@ -117,6 +117,7 @@ describe('QueryRuntimeBridge observability', () => {
         type: 'query_hotpath_dispatch',
         command: 'commit',
         dispatchMode: 'subprocess',
+        reason: 'native_disabled',
         outcome: 'success',
       }),
     );
@@ -141,6 +142,7 @@ describe('QueryRuntimeBridge observability', () => {
         type: 'query_hotpath_dispatch',
         command: 'commit',
         dispatchMode: 'subprocess',
+        reason: 'policy_blocked',
         outcome: 'error',
       }),
     );
diff --git a/sdk/src/query-runtime-bridge.ts b/sdk/src/query-runtime-bridge.ts
index ea2611bde..f37bca580 100644
--- a/sdk/src/query-runtime-bridge.ts
+++ b/sdk/src/query-runtime-bridge.ts
@@ -35,6 +35,7 @@ export interface RuntimeBridgeHotpathEvent {
   legacyCommand: string;
   mode: TransportMode;
   dispatchMode: 'native_hotpath' | 'subprocess';
+  reason?: 'native_disabled' | 'policy_blocked';
   durationMs: number;
   outcome: 'success' | 'error';
   errorKind?: 'timeout' | 'failure';
@@ -168,6 +169,7 @@ export class QueryRuntimeBridge {
         legacyCommand,
         mode,
         dispatchMode: 'subprocess',
+        reason: 'policy_blocked',
         durationMs: Date.now() - startedAt,
         outcome: 'error',
         errorKind: 'failure',
@@ -189,6 +191,7 @@ export class QueryRuntimeBridge {
         legacyCommand,
         mode,
         dispatchMode: useNative ? 'native_hotpath' : 'subprocess',
+        reason: useNative ? undefined : 'native_disabled',
         durationMs: Date.now() - startedAt,
         outcome: 'success',
       });
@@ -201,6 +204,7 @@ export class QueryRuntimeBridge {
         legacyCommand,
         mode,
         dispatchMode: useNative ? 'native_hotpath' : 'subprocess',
+        reason: useNative ? undefined : 'native_disabled',
         durationMs: Date.now() - startedAt,
         outcome: 'error',
         errorKind: kind,