diff --git a/.changeset/fix-batch-taskidentifier-unknown.md b/.changeset/fix-batch-taskidentifier-unknown.md
new file mode 100644
index 0000000000..e0dfc47741
--- /dev/null
+++ b/.changeset/fix-batch-taskidentifier-unknown.md
@@ -0,0 +1,15 @@
+---
+"@trigger.dev/core": patch
+"run-engine": patch
+---
+
+fix: taskIdentifier shows "unknown" in batch.triggerAndWait and batch.triggerByTaskAndWait results
+
+When using `batch.triggerAndWait()` or `batch.triggerByTaskAndWait()`, the `run.taskIdentifier` in the results was showing as "unknown" instead of the actual task identifier (e.g., "generate-audio" or "generate-scene").
+
+This fix:
+- Adds `taskIdentifier` field to the `completedByTaskRun` schema in `runEngine.ts`
+- Updates `executionSnapshotSystem.ts` to include `taskIdentifier` when fetching waitpoints by joining with the TaskRun table
+- Updates `sharedRuntimeManager.ts` to pass through `taskIdentifier` in the execution result
+
+Fixes #2942
diff --git a/internal-packages/run-engine/src/engine/systems/executionSnapshotSystem.ts b/internal-packages/run-engine/src/engine/systems/executionSnapshotSystem.ts
index a224e5a86b..94de281062 100644
--- a/internal-packages/run-engine/src/engine/systems/executionSnapshotSystem.ts
+++ b/internal-packages/run-engine/src/engine/systems/executionSnapshotSystem.ts
@@ -16,6 +16,11 @@ import { SystemResources } from "./systems.js";
 /** Chunk size for fetching waitpoints to avoid NAPI string conversion limits */
 const WAITPOINT_CHUNK_SIZE = 100;
 
+/** Waitpoint with optional completedByTaskRun info including taskIdentifier */
+type WaitpointWithTaskRun = Waitpoint & {
+  completedByTaskRun: { taskIdentifier: string } | null;
+};
+
 export type ExecutionSnapshotSystemOptions = {
   resources: SystemResources;
   heartbeatTimeouts: HeartbeatTimeouts;
@@ -57,7 +62,7 @@ function enhanceExecutionSnapshot(
  */
 function enhanceExecutionSnapshotWithWaitpoints(
   snapshot: ExecutionSnapshotWithCheckpoint,
-  waitpoints: Waitpoint[],
+  waitpoints: WaitpointWithTaskRun[] | Waitpoint[],
   completedWaitpointOrder: string[]
 ): EnhancedExecutionSnapshot {
   return {
@@ -78,6 +83,11 @@ function enhanceExecutionSnapshotWithWaitpoints(
         indexes.push(undefined);
       }
 
+      // Extract taskIdentifier from completedByTaskRun if available
+      const taskIdentifier = 'completedByTaskRun' in w && w.completedByTaskRun
+        ? w.completedByTaskRun.taskIdentifier
+        : undefined;
+
       return indexes.map((index) => {
         return {
           id: w.id,
@@ -89,22 +99,23 @@ function enhanceExecutionSnapshotWithWaitpoints(
             w.userProvidedIdempotencyKey && !w.inactiveIdempotencyKey ? w.idempotencyKey : undefined,
           completedByTaskRun: w.completedByTaskRunId
             ? {
-                id: w.completedByTaskRunId,
-                friendlyId: RunId.toFriendlyId(w.completedByTaskRunId),
-                batch: snapshot.batchId
-                  ? {
-                      id: snapshot.batchId,
-                      friendlyId: BatchId.toFriendlyId(snapshot.batchId),
-                    }
-                  : undefined,
-              }
+              id: w.completedByTaskRunId,
+              friendlyId: RunId.toFriendlyId(w.completedByTaskRunId),
+              taskIdentifier,
+              batch: snapshot.batchId
+                ? {
+                  id: snapshot.batchId,
+                  friendlyId: BatchId.toFriendlyId(snapshot.batchId),
+                }
+                : undefined,
+            }
             : undefined,
           completedAfter: w.completedAfter ?? undefined,
           completedByBatch: w.completedByBatchId
             ? {
-                id: w.completedByBatchId,
-                friendlyId: BatchId.toFriendlyId(w.completedByBatchId),
-              }
+              id: w.completedByBatchId,
+              friendlyId: BatchId.toFriendlyId(w.completedByBatchId),
+            }
             : undefined,
           output: w.output ?? undefined,
           outputType: w.outputType,
@@ -137,14 +148,19 @@ async function getSnapshotWaitpointIds(
 async function fetchWaitpointsInChunks(
   prisma: PrismaClientOrTransaction,
   waitpointIds: string[]
-): Promise<Waitpoint[]> {
+): Promise<WaitpointWithTaskRun[]> {
   if (waitpointIds.length === 0) return [];
 
-  const allWaitpoints: Waitpoint[] = [];
+  const allWaitpoints: WaitpointWithTaskRun[] = [];
   for (let i = 0; i < waitpointIds.length; i += WAITPOINT_CHUNK_SIZE) {
     const chunk = waitpointIds.slice(i, i + WAITPOINT_CHUNK_SIZE);
     const waitpoints = await prisma.waitpoint.findMany({
       where: { id: { in: chunk } },
+      include: {
+        completedByTaskRun: {
+          select: { taskIdentifier: true },
+        },
+      },
     });
     allWaitpoints.push(...waitpoints);
   }
@@ -233,19 +249,19 @@ export function executionDataFromSnapshot(snapshot: EnhancedExecutionSnapshot):
     },
     batch: snapshot.batchId
       ? {
-          id: snapshot.batchId,
-          friendlyId: BatchId.toFriendlyId(snapshot.batchId),
-        }
+        id: snapshot.batchId,
+        friendlyId: BatchId.toFriendlyId(snapshot.batchId),
+      }
       : undefined,
     checkpoint: snapshot.checkpoint
       ? {
-          id: snapshot.checkpoint.id,
-          friendlyId: snapshot.checkpoint.friendlyId,
-          type: snapshot.checkpoint.type,
-          location: snapshot.checkpoint.location,
-          imageRef: snapshot.checkpoint.imageRef,
-          reason: snapshot.checkpoint.reason ?? undefined,
-        }
+        id: snapshot.checkpoint.id,
+        friendlyId: snapshot.checkpoint.friendlyId,
+        type: snapshot.checkpoint.type,
+        location: snapshot.checkpoint.location,
+        imageRef: snapshot.checkpoint.imageRef,
+        reason: snapshot.checkpoint.reason ?? undefined,
+      }
       : undefined,
     completedWaitpoints: snapshot.completedWaitpoints,
   };
diff --git a/packages/core/src/v3/runtime/sharedRuntimeManager.ts b/packages/core/src/v3/runtime/sharedRuntimeManager.ts
index 09c718c1f6..f9b1cbf164 100644
--- a/packages/core/src/v3/runtime/sharedRuntimeManager.ts
+++ b/packages/core/src/v3/runtime/sharedRuntimeManager.ts
@@ -293,17 +293,19 @@ export class SharedRuntimeManager implements RuntimeManager {
       return {
         ok: false,
         id: waitpoint.completedByTaskRun.friendlyId,
+        taskIdentifier: waitpoint.completedByTaskRun.taskIdentifier,
         error: waitpoint.output
           ? JSON.parse(waitpoint.output)
           : {
-              type: "STRING_ERROR",
-              message: "Missing error output",
-            },
+            type: "STRING_ERROR",
+            message: "Missing error output",
+          },
       } satisfies TaskRunFailedExecutionResult;
     } else {
       return {
         ok: true,
         id: waitpoint.completedByTaskRun.friendlyId,
+        taskIdentifier: waitpoint.completedByTaskRun.taskIdentifier,
         output: waitpoint.output,
         outputType: waitpoint.outputType ?? "application/json",
       } satisfies TaskRunSuccessfulExecutionResult;
diff --git a/packages/core/src/v3/schemas/runEngine.ts b/packages/core/src/v3/schemas/runEngine.ts
index e4057e7ca6..1697b94781 100644
--- a/packages/core/src/v3/schemas/runEngine.ts
+++ b/packages/core/src/v3/schemas/runEngine.ts
@@ -81,6 +81,8 @@ export const CompletedWaitpoint = z.object({
     .object({
       id: z.string(),
       friendlyId: z.string(),
+      /** The task identifier of the completing run */
+      taskIdentifier: z.string().optional(),
       /** If the run has an associated batch */
       batch: z
         .object({