diff --git a/src/libs/Terra/Generated/Terra.IWorkoutsClient.WorkoutsCreateWorkout.g.cs b/src/libs/Terra/Generated/Terra.IWorkoutsClient.WorkoutsCreateWorkout.g.cs
index cb26869..eabd429 100644
--- a/src/libs/Terra/Generated/Terra.IWorkoutsClient.WorkoutsCreateWorkout.g.cs
+++ b/src/libs/Terra/Generated/Terra.IWorkoutsClient.WorkoutsCreateWorkout.g.cs
@@ -55,10 +55,10 @@ public partial interface IWorkoutsClient
         /// Estimated calories burned
         /// </param>
         /// <param name="estimatedTss">
-        /// Planned training stress score, where the provider or author supplies one. Read-only today: accepted on create but not forwarded to providers.
+        /// Planned training stress score (0-9999), where the provider or author supplies one. Forwarded to TrainingPeaks, which ignores it when any step target is not RPE and derives it from the structure instead.
         /// </param>
         /// <param name="estimatedIntensityFactor">
-        /// Planned intensity factor, where the provider or author supplies one. Read-only today: accepted on create but not forwarded to providers.
+        /// Planned intensity factor (0-5), where the provider or author supplies one. Forwarded to TrainingPeaks, which ignores it when any step target is not RPE and derives it from the structure instead.
         /// </param>
         /// <param name="workoutId">
         /// Terra identifier of the stored template. Set by Terra in responses; ignored on create.
diff --git a/src/libs/Terra/Generated/Terra.Models.PlannedWorkout.g.cs b/src/libs/Terra/Generated/Terra.Models.PlannedWorkout.g.cs
index bc86ee7..64eac5b 100644
--- a/src/libs/Terra/Generated/Terra.Models.PlannedWorkout.g.cs
+++ b/src/libs/Terra/Generated/Terra.Models.PlannedWorkout.g.cs
@@ -23,10 +23,11 @@ public sealed partial class PlannedWorkout
         public string? WorkoutId { get; set; }
 
         /// <summary>
-        /// Scheduled date (YYYY-MM-DD). Null for provider entries that are not attached to a date, such as a routine library.
+        /// Scheduled date (YYYY-MM-DD)
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("planned_date")]
-        public string? PlannedDate { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required string PlannedDate { get; set; }
 
         /// <summary>
         /// Identifier of the workout on the provider's side, in the form the provider's own API uses for it
@@ -95,6 +96,9 @@ public sealed partial class PlannedWorkout
         /// <summary>
         /// Initializes a new instance of the <see cref="PlannedWorkout" /> class.
         /// </summary>
+        /// <param name="plannedDate">
+        /// Scheduled date (YYYY-MM-DD)
+        /// </param>
         /// <param name="warnings">
         /// Adjustments made while converting between Terra's template and the provider's format. On Terra-created workouts these come from the push to the provider; on external workouts, from reading the provider's workout into a template. Empty when the conversion was exact.
         /// </param>
@@ -107,9 +111,6 @@ public sealed partial class PlannedWorkout
         /// <param name="workoutId">
         /// Identifier of the workout template this was planned from. Null for workouts created on the provider side; a non-null value means the workout is managed through Terra and can be rescheduled or deleted.
         /// </param>
-        /// <param name="plannedDate">
-        /// Scheduled date (YYYY-MM-DD). Null for provider entries that are not attached to a date, such as a routine library.
-        /// </param>
         /// <param name="providerWorkoutId">
         /// Identifier of the workout on the provider's side, in the form the provider's own API uses for it
         /// </param>
@@ -127,11 +128,11 @@ public sealed partial class PlannedWorkout
         [global::System.Diagnostics.CodeAnalysis.SetsRequiredMembers]
 #endif
         public PlannedWorkout(
+            string plannedDate,
             global::System.Collections.Generic.IList<global::Terra.CoercionWarning> warnings,
             bool isExternal,
             string? plannedWorkoutId,
             string? workoutId,
-            string? plannedDate,
             string? providerWorkoutId,
             string? createdAt,
             string? lastUpdatedAt,
@@ -140,7 +141,7 @@ public PlannedWorkout(
         {
             this.PlannedWorkoutId = plannedWorkoutId;
             this.WorkoutId = workoutId;
-            this.PlannedDate = plannedDate;
+            this.PlannedDate = plannedDate ?? throw new global::System.ArgumentNullException(nameof(plannedDate));
             this.ProviderWorkoutId = providerWorkoutId;
             this.Warnings = warnings ?? throw new global::System.ArgumentNullException(nameof(warnings));
             this.CreatedAt = createdAt;
diff --git a/src/libs/Terra/Generated/Terra.Models.PlannedWorkoutBody.g.cs b/src/libs/Terra/Generated/Terra.Models.PlannedWorkoutBody.g.cs
index 853d023..d2f2643 100644
--- a/src/libs/Terra/Generated/Terra.Models.PlannedWorkoutBody.g.cs
+++ b/src/libs/Terra/Generated/Terra.Models.PlannedWorkoutBody.g.cs
@@ -59,13 +59,13 @@ public sealed partial class PlannedWorkoutBody
         public double? EstimatedCalories { get; set; }
 
         /// <summary>
-        /// Planned training stress score, where the provider or author supplies one. Read-only today: accepted on create but not forwarded to providers.
+        /// Planned training stress score (0-9999), where the provider or author supplies one. Forwarded to TrainingPeaks, which ignores it when any step target is not RPE and derives it from the structure instead.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("estimated_tss")]
         public double? EstimatedTss { get; set; }
 
         /// <summary>
-        /// Planned intensity factor, where the provider or author supplies one. Read-only today: accepted on create but not forwarded to providers.
+        /// Planned intensity factor (0-5), where the provider or author supplies one. Forwarded to TrainingPeaks, which ignores it when any step target is not RPE and derives it from the structure instead.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("estimated_intensity_factor")]
         public double? EstimatedIntensityFactor { get; set; }
@@ -117,10 +117,10 @@ public sealed partial class PlannedWorkoutBody
         /// Estimated calories burned
         /// </param>
         /// <param name="estimatedTss">
-        /// Planned training stress score, where the provider or author supplies one. Read-only today: accepted on create but not forwarded to providers.
+        /// Planned training stress score (0-9999), where the provider or author supplies one. Forwarded to TrainingPeaks, which ignores it when any step target is not RPE and derives it from the structure instead.
         /// </param>
         /// <param name="estimatedIntensityFactor">
-        /// Planned intensity factor, where the provider or author supplies one. Read-only today: accepted on create but not forwarded to providers.
+        /// Planned intensity factor (0-5), where the provider or author supplies one. Forwarded to TrainingPeaks, which ignores it when any step target is not RPE and derives it from the structure instead.
         /// </param>
         /// <param name="workoutId">
         /// Terra identifier of the stored template. Set by Terra in responses; ignored on create.
diff --git a/src/libs/Terra/Generated/Terra.Models.WorkoutTemplate.g.cs b/src/libs/Terra/Generated/Terra.Models.WorkoutTemplate.g.cs
index bd65c5b..965802d 100644
--- a/src/libs/Terra/Generated/Terra.Models.WorkoutTemplate.g.cs
+++ b/src/libs/Terra/Generated/Terra.Models.WorkoutTemplate.g.cs
@@ -59,13 +59,13 @@ public sealed partial class WorkoutTemplate
         public double? EstimatedCalories { get; set; }
 
         /// <summary>
-        /// Planned training stress score, where the provider or author supplies one. Read-only today: accepted on create but not forwarded to providers.
+        /// Planned training stress score (0-9999), where the provider or author supplies one. Forwarded to TrainingPeaks, which ignores it when any step target is not RPE and derives it from the structure instead.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("estimated_tss")]
         public double? EstimatedTss { get; set; }
 
         /// <summary>
-        /// Planned intensity factor, where the provider or author supplies one. Read-only today: accepted on create but not forwarded to providers.
+        /// Planned intensity factor (0-5), where the provider or author supplies one. Forwarded to TrainingPeaks, which ignores it when any step target is not RPE and derives it from the structure instead.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("estimated_intensity_factor")]
         public double? EstimatedIntensityFactor { get; set; }
@@ -117,10 +117,10 @@ public sealed partial class WorkoutTemplate
         /// Estimated calories burned
         /// </param>
         /// <param name="estimatedTss">
-        /// Planned training stress score, where the provider or author supplies one. Read-only today: accepted on create but not forwarded to providers.
+        /// Planned training stress score (0-9999), where the provider or author supplies one. Forwarded to TrainingPeaks, which ignores it when any step target is not RPE and derives it from the structure instead.
         /// </param>
         /// <param name="estimatedIntensityFactor">
-        /// Planned intensity factor, where the provider or author supplies one. Read-only today: accepted on create but not forwarded to providers.
+        /// Planned intensity factor (0-5), where the provider or author supplies one. Forwarded to TrainingPeaks, which ignores it when any step target is not RPE and derives it from the structure instead.
         /// </param>
         /// <param name="workoutId">
         /// Terra identifier of the stored template. Set by Terra in responses; ignored on create.
diff --git a/src/libs/Terra/Generated/Terra.WorkoutsClient.WorkoutsCreateWorkout.g.cs b/src/libs/Terra/Generated/Terra.WorkoutsClient.WorkoutsCreateWorkout.g.cs
index be98911..ed08c98 100644
--- a/src/libs/Terra/Generated/Terra.WorkoutsClient.WorkoutsCreateWorkout.g.cs
+++ b/src/libs/Terra/Generated/Terra.WorkoutsClient.WorkoutsCreateWorkout.g.cs
@@ -532,10 +532,10 @@ partial void ProcessWorkoutsCreateWorkoutResponseContent(
         /// Estimated calories burned
         /// </param>
         /// <param name="estimatedTss">
-        /// Planned training stress score, where the provider or author supplies one. Read-only today: accepted on create but not forwarded to providers.
+        /// Planned training stress score (0-9999), where the provider or author supplies one. Forwarded to TrainingPeaks, which ignores it when any step target is not RPE and derives it from the structure instead.
         /// </param>
         /// <param name="estimatedIntensityFactor">
-        /// Planned intensity factor, where the provider or author supplies one. Read-only today: accepted on create but not forwarded to providers.
+        /// Planned intensity factor (0-5), where the provider or author supplies one. Forwarded to TrainingPeaks, which ignores it when any step target is not RPE and derives it from the structure instead.
         /// </param>
         /// <param name="workoutId">
         /// Terra identifier of the stored template. Set by Terra in responses; ignored on create.
diff --git a/src/libs/Terra/openapi.yaml b/src/libs/Terra/openapi.yaml
index 8216c31..d90b550 100644
--- a/src/libs/Terra/openapi.yaml
+++ b/src/libs/Terra/openapi.yaml
@@ -2,7 +2,7 @@ openapi: 3.0.3
 info:
   description: The Terra API (v2 surface, served at access.tryterra.co/api/v2).
   title: TerraAPI
-  version: 2026.09.04.2
+  version: 2026.09.08
   license:
     name: Apache-2.0
     url: https://github.com/tryterra/openapi/blob/master/LICENSE
@@ -2222,12 +2222,14 @@ components:
           anyOf:
           - type: number
           - type: 'null'
-          description: 'Planned training stress score, where the provider or author supplies one. Read-only today: accepted on create but not forwarded to providers.'
+          description: Planned training stress score (0-9999), where the provider or author supplies one. Forwarded to TrainingPeaks, which ignores it when any step target is not RPE and derives it from
+            the structure instead.
         estimated_intensity_factor:
           anyOf:
           - type: number
           - type: 'null'
-          description: 'Planned intensity factor, where the provider or author supplies one. Read-only today: accepted on create but not forwarded to providers.'
+          description: Planned intensity factor (0-5), where the provider or author supplies one. Forwarded to TrainingPeaks, which ignores it when any step target is not RPE and derives it from the structure
+            instead.
         workout_id:
           anyOf:
           - type: string
@@ -2331,12 +2333,14 @@ components:
           anyOf:
           - type: number
           - type: 'null'
-          description: 'Planned training stress score, where the provider or author supplies one. Read-only today: accepted on create but not forwarded to providers.'
+          description: Planned training stress score (0-9999), where the provider or author supplies one. Forwarded to TrainingPeaks, which ignores it when any step target is not RPE and derives it from
+            the structure instead.
         estimated_intensity_factor:
           anyOf:
           - type: number
           - type: 'null'
-          description: 'Planned intensity factor, where the provider or author supplies one. Read-only today: accepted on create but not forwarded to providers.'
+          description: Planned intensity factor (0-5), where the provider or author supplies one. Forwarded to TrainingPeaks, which ignores it when any step target is not RPE and derives it from the structure
+            instead.
         workout_id:
           anyOf:
           - type: string
@@ -9352,10 +9356,8 @@ components:
           description: Identifier of the workout template this was planned from. Null for workouts created on the provider side; a non-null value means the workout is managed through Terra and can be rescheduled
             or deleted.
         planned_date:
-          anyOf:
-          - type: string
-          - type: 'null'
-          description: Scheduled date (YYYY-MM-DD). Null for provider entries that are not attached to a date, such as a routine library.
+          type: string
+          description: Scheduled date (YYYY-MM-DD)
         provider_workout_id:
           anyOf:
           - type: string