diff --git a/examples/bare/e2e/api-arguments.test.ts b/examples/bare/e2e/api-arguments.test.ts
index 17a5e019..3d04cc84 100644
--- a/examples/bare/e2e/api-arguments.test.ts
+++ b/examples/bare/e2e/api-arguments.test.ts
@@ -118,11 +118,11 @@ describeDevice(`overloads and arguments on ${TARGET_NAME}`, () => {
 
     /**
      * The implementation plan (docs/design/plans/2026-09-16-implementation-plan.md,
-     * Phase 1 Red) says a blank token rejects with `E_TOKEN`. `assertUsableToken`
-     * (packages/react-native/src/index.ts) throws a plain Error with no `code`.
-     * Wrapper divergence, to fix (sdk-issues-filed.md "to fix").
+     * Phase 1 Red) says a blank token rejects with `E_TOKEN`, the code the
+     * native modules use. `assertUsableToken` (packages/react-native/src/index.ts)
+     * runs first and carries the same code and message (W2).
      */
-    it.failing('[API-01c] the rejection carries code E_TOKEN', () => {
+    it('[API-01c] the rejection carries code E_TOKEN', () => {
       for (const key of ['blank', 'spaces', 'number']) {
         expect(jsonAfter<Settled>(rejected.text, key).error?.code).toBe('E_TOKEN');
       }
diff --git a/examples/bare/e2e/console-levels.test.ts b/examples/bare/e2e/console-levels.test.ts
index bddc0d72..6958147b 100644
--- a/examples/bare/e2e/console-levels.test.ts
+++ b/examples/bare/e2e/console-levels.test.ts
@@ -78,15 +78,12 @@ describeDevice(`console levels and the native-only log stream on ${TARGET_NAME}`
   });
 
   /**
-   * iOS (XS and simulator, beta5, Debug, 2026-10-07): the line lands three
-   * times -- the bridge's Custom (98) line at Warning (2), and twice more as
-   * source 2 at level 4, RN's own stderr/os_log output of the RCTLog, which
-   * the SDK captures -- and the log filter runs three times (counts.rct 3).
-   * BGSRNConsoleCapture.mm forwards a native RCTLog line without arming the
-   * echo drop it arms for console.* lines. A wrapper bug (G16), to fix:
-   * sdk-issues-filed.md W1. Android: once.
+   * iOS used to record this line three times (the bridge's Custom line plus
+   * two stderr echoes: RN's own delivery and LogBox's JS relog of the
+   * warning) and filter it three times (W1). BGSRNConsoleCapture.mm now arms
+   * the echo drop for a native line and its relog. Android: logcat, once.
    */
-  (ON_IOS ? it.failing : it)('[FLOW-13] a native RCTLog warning with no console call lands once and is filtered once', () => {
+  it('[FLOW-13] a native RCTLog warning with no console call lands once and is filtered once', () => {
     expect(linesOf('rct')).toHaveLength(1);
     expect(counts.rct).toBe(1);
   });
diff --git a/packages/react-native/ios/BGSRNConsoleCapture.h b/packages/react-native/ios/BGSRNConsoleCapture.h
index 5dc32423..1202eb94 100644
--- a/packages/react-native/ios/BGSRNConsoleCapture.h
+++ b/packages/react-native/ios/BGSRNConsoleCapture.h
@@ -16,6 +16,12 @@ NS_ASSUME_NONNULL_BEGIN
  * that echo. Keeping the channel line ends the equal-text claim. A later
  * Custom line of the same text is kept, including `Bugsee.log` and a native
  * `RCTLog` forwarded as Custom.
+ *
+ * A native line arms the same echo drop before the rest of the log function
+ * chain runs, so an app that mirrors RCTLog to stderr does not record it a
+ * second time. In a Debug build RN re-logs a native warning from JS (LogBox);
+ * that JavaScript delivery arms one more drop, for its own echo. The line is
+ * recorded and filtered once.
  */
 void BGSRNInstallConsoleCapture(void);
 
diff --git a/packages/react-native/ios/BGSRNConsoleCapture.mm b/packages/react-native/ios/BGSRNConsoleCapture.mm
index 1b988157..d6172fa3 100644
--- a/packages/react-native/ios/BGSRNConsoleCapture.mm
+++ b/packages/react-native/ios/BGSRNConsoleCapture.mm
@@ -43,29 +43,6 @@ static BOOL BGSRNConsoleCaptureEnabled(void) {
   return [value boolValue];
 }
 
-static void BGSRNOnRCTLog(RCTLogLevel level, RCTLogSource source, NSString *message) {
-  // JavaScript source is the console echo. The JS patch forwards that call
-  // in dev and in release; recording it here would run the filter twice.
-  // Release builds often never produce this source for console.*, and
-  // dropping the patch instead of this echo would drop those logs.
-  if (source == RCTLogSourceJavaScript) {
-    return;
-  }
-  if (message.length == 0) {
-    return;
-  }
-  NSMutableDictionary *locals = NSThread.currentThread.threadDictionary;
-  if (locals[BGSRNConsoleCaptureKey] != nil) {
-    return;
-  }
-  locals[BGSRNConsoleCaptureKey] = @YES;
-  if (BGSRNConsoleCaptureEnabled()) {
-    [BGSRNWrapperChannelHolder.shared logMessage:message
-                                           level:BGSRNWireLevelForRCTLogLevel(level)];
-  }
-  [locals removeObjectForKey:BGSRNConsoleCaptureKey];
-}
-
 static const NSTimeInterval BGSRNEchoWindowSeconds = 2.0;
 static const NSUInteger BGSRNEchoNoteCap = 32;
 
@@ -238,15 +215,130 @@ BOOL BGSRNDropConsoleEcho(NSString *line, NSInteger source) {
   }
 }
 
+/// Native warnings React Native re-logs from JS. In a Debug build
+/// `_RCTLogNativeInternal` also calls `RCTLog.logIfNoNativeHook`, and
+/// LogBox's warning handler passes a `warn` to the `console.warn` it saved
+/// before any patch. That reaches RCTLog a second time, as
+/// `RCTLogSourceJavaScript`, with the same text. This hook does not record
+/// it, but whatever the log function chain writes for it (an app's stderr
+/// mirror, an NSLog) is a second echo of the line already recorded. Each
+/// entry arms one more echo drop when that delivery arrives. Under the echo
+/// lock.
+static NSMutableArray<BGSRNEchoNote *> *BGSRNRelogNotes;
+
+static void BGSRNExpectJsRelog(NSString *message) {
+  @synchronized(BGSRNEchoLock()) {
+    const NSTimeInterval now = [NSDate date].timeIntervalSince1970;
+    if (BGSRNRelogNotes == nil) {
+      BGSRNRelogNotes = [NSMutableArray array];
+    }
+    BGSRNEchoNote *note = [BGSRNEchoNote new];
+    note.text = message;
+    note.expires = now + BGSRNEchoWindowSeconds;
+    [BGSRNRelogNotes addObject:note];
+    while (BGSRNRelogNotes.count > BGSRNEchoNoteCap) {
+      [BGSRNRelogNotes removeObjectAtIndex:0];
+    }
+  }
+}
+
+/// YES once per expected relog of `message`, within the echo window.
+static BOOL BGSRNClaimJsRelog(NSString *message) {
+  @synchronized(BGSRNEchoLock()) {
+    const NSTimeInterval now = [NSDate date].timeIntervalSince1970;
+    for (NSInteger index = (NSInteger)BGSRNRelogNotes.count - 1; index >= 0; index--) {
+      if (BGSRNRelogNotes[(NSUInteger)index].expires <= now) {
+        [BGSRNRelogNotes removeObjectAtIndex:(NSUInteger)index];
+      }
+    }
+    for (NSUInteger index = 0; index < BGSRNRelogNotes.count; index++) {
+      if ([BGSRNRelogNotes[index].text isEqualToString:message]) {
+        [BGSRNRelogNotes removeObjectAtIndex:index];
+        return YES;
+      }
+    }
+    return NO;
+  }
+}
+
+/**
+ * Runs before the rest of the log function chain, so every echo drop is
+ * armed before anything in that chain can write the line where the SDK
+ * captures it. Returns YES when this line is to be recorded on the channel
+ * after the chain has run.
+ *
+ * JavaScript source is the console echo. The JS patch forwards that call in
+ * dev and in release; recording it here would run the filter twice. Release
+ * builds often never produce this source for console.*, and dropping the
+ * patch instead of this echo would drop those logs. A JavaScript delivery
+ * that is the relog of a native warning arms one more echo drop.
+ *
+ * A native line is recorded here, once, and its echo drop is armed the way
+ * the JS patch arms one for a console call: a stderr stamp and one raw
+ * stdout or stderr line of that text.
+ */
+static BOOL BGSRNBeginRCTLog(RCTLogLevel level, RCTLogSource source, NSString *message) {
+  if (message.length == 0) {
+    return NO;
+  }
+  if (source == RCTLogSourceJavaScript) {
+    if (BGSRNClaimJsRelog(message)) {
+      BGSRNNoteConsoleEcho(message);
+    }
+    return NO;
+  }
+  if (NSThread.currentThread.threadDictionary[BGSRNConsoleCaptureKey] != nil) {
+    return NO;
+  }
+  if (!BGSRNConsoleCaptureEnabled()) {
+    return NO;
+  }
+  BGSRNNoteConsoleEcho(message);
+#if RCT_DEBUG
+  if (level == RCTLogLevelWarning) {
+    BGSRNExpectJsRelog(message);
+  }
+#endif
+  return YES;
+}
+
+/// Records a native line on the channel, as Custom. The filter runs inside
+/// this call on this thread: that is the channel line, which is kept.
+static void BGSRNForwardRCTLog(RCTLogLevel level, NSString *message) {
+  NSMutableDictionary *locals = NSThread.currentThread.threadDictionary;
+  locals[BGSRNConsoleCaptureKey] = @YES;
+  BGSRNBeginChannelLine(message);
+  @try {
+    [BGSRNWrapperChannelHolder.shared logMessage:message
+                                           level:BGSRNWireLevelForRCTLogLevel(level)];
+  } @finally {
+    BGSRNEndChannelLine(message);
+    [locals removeObjectForKey:BGSRNConsoleCaptureKey];
+  }
+}
+
+/**
+ * Wraps the current log function rather than appending to it
+ * (`RCTAddLogFunction` runs the existing function first): the echo drop of a
+ * line must be armed before the existing function writes that line to
+ * stderr, or the SDK could capture and filter the echo first.
+ */
 void BGSRNInstallConsoleCapture(void) {
   static dispatch_once_t onceToken;
   dispatch_once(&onceToken, ^{
-    RCTAddLogFunction(^(RCTLogLevel level,
+    RCTLogFunction existing = RCTGetLogFunction();
+    RCTSetLogFunction(^(RCTLogLevel level,
                         RCTLogSource source,
-                        __unused NSString *fileName,
-                        __unused NSNumber *lineNumber,
+                        NSString *fileName,
+                        NSNumber *lineNumber,
                         NSString *message) {
-      BGSRNOnRCTLog(level, source, message);
+      const BOOL forward = BGSRNBeginRCTLog(level, source, message);
+      if (existing != nil) {
+        existing(level, source, fileName, lineNumber, message);
+      }
+      if (forward) {
+        BGSRNForwardRCTLog(level, message);
+      }
     });
   });
 }
diff --git a/packages/react-native/src/__tests__/lifecycle.test.ts b/packages/react-native/src/__tests__/lifecycle.test.ts
index fc60ef3a..ff909191 100644
--- a/packages/react-native/src/__tests__/lifecycle.test.ts
+++ b/packages/react-native/src/__tests__/lifecycle.test.ts
@@ -62,6 +62,22 @@ describe('launch', () => {
     expect(native.launch).not.toHaveBeenCalled();
   });
 
+  // The native modules reject a blank token with E_TOKEN (implementation plan,
+  // Task 1.3). The JS check runs first on both platforms, so it must carry
+  // the same code and message, or a caller matching on `.code` sees nothing.
+  it.each(['', '   ', undefined, null, 42])(
+    'rejects the unusable token %p with code E_TOKEN and the native message',
+    async (token) => {
+      const rejection = Bugsee.launch(token as unknown as string);
+      await expect(rejection).rejects.toBeInstanceOf(Error);
+      await expect(rejection).rejects.toMatchObject({
+        code: 'E_TOKEN',
+        message: 'Bugsee.launch requires a non-empty app token',
+      });
+      expect(native.launch).not.toHaveBeenCalled();
+    },
+  );
+
   it('surfaces a native rejection to the caller', async () => {
     native.launch.mockRejectedValue(new Error('boom'));
     await expect(Bugsee.launch('tok')).rejects.toThrow('boom');
diff --git a/packages/react-native/src/index.ts b/packages/react-native/src/index.ts
index 05b2fac9..2ad80c43 100644
--- a/packages/react-native/src/index.ts
+++ b/packages/react-native/src/index.ts
@@ -861,9 +861,16 @@ function optionalReportText(
   return value;
 }
 
+/**
+ * Rejects a blank or non-string token before the bridge, with the code and
+ * message the native modules use for the same refusal (`E_TOKEN`), so a
+ * caller matching on `.code` sees one answer whichever side raised it.
+ */
 function assertUsableToken(token: string): void {
   if (typeof token !== 'string' || token.trim().length === 0) {
-    throw new Error('Bugsee.launch requires a non-empty app token');
+    throw Object.assign(new Error('Bugsee.launch requires a non-empty app token'), {
+      code: 'E_TOKEN',
+    });
   }
 }