diff --git a/worker/src/utils/isolated-volume.ts b/worker/src/utils/isolated-volume.ts
index 70c0cd26..53e35ee8 100644
--- a/worker/src/utils/isolated-volume.ts
+++ b/worker/src/utils/isolated-volume.ts
@@ -50,6 +50,19 @@ export class IsolatedContainerVolume {
     }
   }
 
+  /**
+   * Derives the deterministic volume name for a given tenant and run.
+   * Downstream components can use this to reference an existing volume
+   * created by an upstream component in the same workflow execution.
+   *
+   * @param tenantId - Tenant identifier
+   * @param runId - Unique run/execution identifier
+   * @returns The volume name (e.g., `tenant-foo-run-bar`)
+   */
+  static deriveVolumeName(tenantId: string, runId: string): string {
+    return `tenant-${tenantId}-run-${runId}`;
+  }
+
   /**
    * Creates the isolated volume and populates it with files.
    *
@@ -72,9 +85,9 @@ export class IsolatedContainerVolume {
       });
     }
 
-    // Create unique volume name with timestamp to prevent collisions
-    const timestamp = Date.now();
-    this.volumeName = `tenant-${this.tenantId}-run-${this.runId}-${timestamp}`;
+    // Create deterministic volume name from tenantId + runId
+    // runId is unique per workflow execution, so no timestamp needed
+    this.volumeName = IsolatedContainerVolume.deriveVolumeName(this.tenantId, this.runId);
 
     try {
       // Create the volume with labels for tracking