diff --git a/CHANGELOG.md b/CHANGELOG.md
index 41b4bc40d..90d82309e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,15 @@
     - `v3api`: **New:** New package which can be used for communication with the postgresflex v3 API
     - `v2api`: **Deprecated:** `v2api` is deprecated, use instead `v3api`
     - `v3beta1api`: **Deprecated:** `v3beta1api` is deprecated, use instead `v3api`
+- `telemetrylink`:
+  - [v0.5.0](services/telemetrylink/CHANGELOG.md#v050)
+    - **Improvement:** Add validation for `Description` field
+    - `v1api`: **Improvement:** Add validation for `Description` field 
+- `telemetryrouter`:
+  - [v0.5.0](services/telemetryrouter/CHANGELOG.md#v050)
+    - **Improvement:** Add validation for `Description` field
+    - `v1api`: **Improvement:** Add validation for `Description` field
+
 
 ## Release (2026-07-21)
 
diff --git a/services/telemetrylink/CHANGELOG.md b/services/telemetrylink/CHANGELOG.md
index e60c6f90d..990c2e208 100644
--- a/services/telemetrylink/CHANGELOG.md
+++ b/services/telemetrylink/CHANGELOG.md
@@ -1,3 +1,7 @@
+## v0.5.0
+- **Improvement:** Add validation for `Description` field
+- `v1api`: **Improvement:** Add validation for `Description` field
+
 ## v0.4.0
 - `v1api`: **Feature:** Add support for `If-None-Match` header in `CreateOrUpdateFolderTelemetryLink`, `CreateOrUpdateOrganizationTelemetryLink` and `CreateOrUpdateProjectTelemetryLink`
 
diff --git a/services/telemetrylink/VERSION b/services/telemetrylink/VERSION
index 01e994d3d..48080b4cf 100644
--- a/services/telemetrylink/VERSION
+++ b/services/telemetrylink/VERSION
@@ -1 +1 @@
-v0.4.0
\ No newline at end of file
+v0.5.0
\ No newline at end of file
diff --git a/services/telemetrylink/oas_commit b/services/telemetrylink/oas_commit
index be073bf26..1538b64bb 100644
--- a/services/telemetrylink/oas_commit
+++ b/services/telemetrylink/oas_commit
@@ -1 +1 @@
-72230b88b02a415757a997174c27da16db266be6
+d5bd75f47f4b364fa6f71663efb4ba41ec703ac8
diff --git a/services/telemetrylink/v1api/model_create_or_update_folder_telemetry_link_payload.go b/services/telemetrylink/v1api/model_create_or_update_folder_telemetry_link_payload.go
index 435fb37f1..3cb875d27 100644
--- a/services/telemetrylink/v1api/model_create_or_update_folder_telemetry_link_payload.go
+++ b/services/telemetrylink/v1api/model_create_or_update_folder_telemetry_link_payload.go
@@ -23,7 +23,7 @@ type CreateOrUpdateFolderTelemetryLinkPayload struct {
 	// The access token.
 	AccessToken string `json:"accessToken" validate:"regexp=^[A-Za-z0-9-_=]+\\\\.[A-Za-z0-9-_=]+\\\\.?[A-Za-z0-9-_.+\\/=]*$"`
 	// The description is a longer text chosen by the user to provide more context for the resource.
-	Description *string `json:"description,omitempty"`
+	Description *string `json:"description,omitempty" validate:"regexp=^([a-zA-Z0-9][a-zA-Z0-9 \\\\-]*)?$"`
 	// The display name is a short name chosen by the user to identify the resource.
 	DisplayName string `json:"displayName" validate:"regexp=^[a-zA-Z0-9][a-zA-Z0-9 \\\\-]*$"`
 	// Indicates whether routing through the link to a telemetry-router is active.
diff --git a/services/telemetrylink/v1api/model_create_or_update_organization_telemetry_link_payload.go b/services/telemetrylink/v1api/model_create_or_update_organization_telemetry_link_payload.go
index 959f1ae7d..7a68c7195 100644
--- a/services/telemetrylink/v1api/model_create_or_update_organization_telemetry_link_payload.go
+++ b/services/telemetrylink/v1api/model_create_or_update_organization_telemetry_link_payload.go
@@ -23,7 +23,7 @@ type CreateOrUpdateOrganizationTelemetryLinkPayload struct {
 	// The access token.
 	AccessToken string `json:"accessToken" validate:"regexp=^[A-Za-z0-9-_=]+\\\\.[A-Za-z0-9-_=]+\\\\.?[A-Za-z0-9-_.+\\/=]*$"`
 	// The description is a longer text chosen by the user to provide more context for the resource.
-	Description *string `json:"description,omitempty"`
+	Description *string `json:"description,omitempty" validate:"regexp=^([a-zA-Z0-9][a-zA-Z0-9 \\\\-]*)?$"`
 	// The display name is a short name chosen by the user to identify the resource.
 	DisplayName string `json:"displayName" validate:"regexp=^[a-zA-Z0-9][a-zA-Z0-9 \\\\-]*$"`
 	// Indicates whether routing through the link to a telemetry-router is active.
diff --git a/services/telemetrylink/v1api/model_create_or_update_project_telemetry_link_payload.go b/services/telemetrylink/v1api/model_create_or_update_project_telemetry_link_payload.go
index f127ddc02..953f6e21b 100644
--- a/services/telemetrylink/v1api/model_create_or_update_project_telemetry_link_payload.go
+++ b/services/telemetrylink/v1api/model_create_or_update_project_telemetry_link_payload.go
@@ -23,7 +23,7 @@ type CreateOrUpdateProjectTelemetryLinkPayload struct {
 	// The access token.
 	AccessToken string `json:"accessToken" validate:"regexp=^[A-Za-z0-9-_=]+\\\\.[A-Za-z0-9-_=]+\\\\.?[A-Za-z0-9-_.+\\/=]*$"`
 	// The description is a longer text chosen by the user to provide more context for the resource.
-	Description *string `json:"description,omitempty"`
+	Description *string `json:"description,omitempty" validate:"regexp=^([a-zA-Z0-9][a-zA-Z0-9 \\\\-]*)?$"`
 	// The display name is a short name chosen by the user to identify the resource.
 	DisplayName string `json:"displayName" validate:"regexp=^[a-zA-Z0-9][a-zA-Z0-9 \\\\-]*$"`
 	// Indicates whether routing through the link to a telemetry-router is active.
diff --git a/services/telemetrylink/v1api/model_partial_update_folder_telemetry_link_payload.go b/services/telemetrylink/v1api/model_partial_update_folder_telemetry_link_payload.go
index de22f0665..d9a43239e 100644
--- a/services/telemetrylink/v1api/model_partial_update_folder_telemetry_link_payload.go
+++ b/services/telemetrylink/v1api/model_partial_update_folder_telemetry_link_payload.go
@@ -22,7 +22,7 @@ type PartialUpdateFolderTelemetryLinkPayload struct {
 	// The access token.
 	AccessToken *string `json:"accessToken,omitempty" validate:"regexp=^[A-Za-z0-9-_=]+\\\\.[A-Za-z0-9-_=]+\\\\.?[A-Za-z0-9-_.+\\/=]*$"`
 	// The description is a longer text chosen by the user to provide more context for the resource.
-	Description *string `json:"description,omitempty"`
+	Description *string `json:"description,omitempty" validate:"regexp=^([a-zA-Z0-9][a-zA-Z0-9 \\\\-]*)?$"`
 	// The display name is a short name chosen by the user to identify the resource.
 	DisplayName *string `json:"displayName,omitempty" validate:"regexp=^[a-zA-Z0-9][a-zA-Z0-9 \\\\-]*$"`
 	// Indicates whether routing through the link to a telemetry-router is active.
diff --git a/services/telemetrylink/v1api/model_partial_update_organization_telemetry_link_payload.go b/services/telemetrylink/v1api/model_partial_update_organization_telemetry_link_payload.go
index 3f4580bec..6e3f0a5fd 100644
--- a/services/telemetrylink/v1api/model_partial_update_organization_telemetry_link_payload.go
+++ b/services/telemetrylink/v1api/model_partial_update_organization_telemetry_link_payload.go
@@ -22,7 +22,7 @@ type PartialUpdateOrganizationTelemetryLinkPayload struct {
 	// The access token.
 	AccessToken *string `json:"accessToken,omitempty" validate:"regexp=^[A-Za-z0-9-_=]+\\\\.[A-Za-z0-9-_=]+\\\\.?[A-Za-z0-9-_.+\\/=]*$"`
 	// The description is a longer text chosen by the user to provide more context for the resource.
-	Description *string `json:"description,omitempty"`
+	Description *string `json:"description,omitempty" validate:"regexp=^([a-zA-Z0-9][a-zA-Z0-9 \\\\-]*)?$"`
 	// The display name is a short name chosen by the user to identify the resource.
 	DisplayName *string `json:"displayName,omitempty" validate:"regexp=^[a-zA-Z0-9][a-zA-Z0-9 \\\\-]*$"`
 	// Indicates whether routing through the link to a telemetry-router is active.
diff --git a/services/telemetrylink/v1api/model_partial_update_project_telemetry_link_payload.go b/services/telemetrylink/v1api/model_partial_update_project_telemetry_link_payload.go
index 849cca9dc..19a9f043d 100644
--- a/services/telemetrylink/v1api/model_partial_update_project_telemetry_link_payload.go
+++ b/services/telemetrylink/v1api/model_partial_update_project_telemetry_link_payload.go
@@ -22,7 +22,7 @@ type PartialUpdateProjectTelemetryLinkPayload struct {
 	// The access token.
 	AccessToken *string `json:"accessToken,omitempty" validate:"regexp=^[A-Za-z0-9-_=]+\\\\.[A-Za-z0-9-_=]+\\\\.?[A-Za-z0-9-_.+\\/=]*$"`
 	// The description is a longer text chosen by the user to provide more context for the resource.
-	Description *string `json:"description,omitempty"`
+	Description *string `json:"description,omitempty" validate:"regexp=^([a-zA-Z0-9][a-zA-Z0-9 \\\\-]*)?$"`
 	// The display name is a short name chosen by the user to identify the resource.
 	DisplayName *string `json:"displayName,omitempty" validate:"regexp=^[a-zA-Z0-9][a-zA-Z0-9 \\\\-]*$"`
 	// Indicates whether routing through the link to a telemetry-router is active.
diff --git a/services/telemetrylink/v1api/model_telemetry_link_request.go b/services/telemetrylink/v1api/model_telemetry_link_request.go
index e4aa15b4e..b80421eab 100644
--- a/services/telemetrylink/v1api/model_telemetry_link_request.go
+++ b/services/telemetrylink/v1api/model_telemetry_link_request.go
@@ -22,7 +22,7 @@ type TelemetryLinkRequest struct {
 	// The access token.
 	AccessToken *string `json:"accessToken,omitempty" validate:"regexp=^[A-Za-z0-9-_=]+\\\\.[A-Za-z0-9-_=]+\\\\.?[A-Za-z0-9-_.+\\/=]*$"`
 	// The description is a longer text chosen by the user to provide more context for the resource.
-	Description *string `json:"description,omitempty"`
+	Description *string `json:"description,omitempty" validate:"regexp=^([a-zA-Z0-9][a-zA-Z0-9 \\\\-]*)?$"`
 	// The display name is a short name chosen by the user to identify the resource.
 	DisplayName *string `json:"displayName,omitempty" validate:"regexp=^[a-zA-Z0-9][a-zA-Z0-9 \\\\-]*$"`
 	// Indicates whether routing through the link to a telemetry-router is active.
diff --git a/services/telemetryrouter/CHANGELOG.md b/services/telemetryrouter/CHANGELOG.md
index 6c818d543..1f4d21058 100644
--- a/services/telemetryrouter/CHANGELOG.md
+++ b/services/telemetryrouter/CHANGELOG.md
@@ -1,3 +1,7 @@
+## v0.5.0
+- **Improvement:** Add validation for `Description` field
+- `v1api`: **Improvement:** Add validation for `Description` field 
+
 ## v0.4.0
 - **New**: v1api API version for STACKIT Telemetry Router
 
diff --git a/services/telemetryrouter/VERSION b/services/telemetryrouter/VERSION
index 01e994d3d..48080b4cf 100644
--- a/services/telemetryrouter/VERSION
+++ b/services/telemetryrouter/VERSION
@@ -1 +1 @@
-v0.4.0
\ No newline at end of file
+v0.5.0
\ No newline at end of file
diff --git a/services/telemetryrouter/oas_commit b/services/telemetryrouter/oas_commit
index 5c05d0ead..9df10dbb7 100644
--- a/services/telemetryrouter/oas_commit
+++ b/services/telemetryrouter/oas_commit
@@ -1 +1 @@
-58dbd39e05f1ddc2d44b191eb3476225130c4ded
+704bc151ecb2fa86e14ed14e7066163b24c08138
diff --git a/services/telemetryrouter/v1api/model_create_destination_payload.go b/services/telemetryrouter/v1api/model_create_destination_payload.go
index 4a82b7a13..ecc8f4c27 100644
--- a/services/telemetryrouter/v1api/model_create_destination_payload.go
+++ b/services/telemetryrouter/v1api/model_create_destination_payload.go
@@ -22,7 +22,7 @@ var _ MappedNullable = &CreateDestinationPayload{}
 type CreateDestinationPayload struct {
 	Config DestinationConfig `json:"config"`
 	// The description is a longer text chosen by the user to provide more context for the resource.
-	Description *string `json:"description,omitempty"`
+	Description *string `json:"description,omitempty" validate:"regexp=^([a-zA-Z0-9][a-zA-Z0-9 \\\\-]*)?$"`
 	// The display name is a short name chosen by the user to identify the resource.
 	DisplayName          string `json:"displayName" validate:"regexp=^[a-zA-Z0-9][a-zA-Z0-9 \\\\-]*$"`
 	AdditionalProperties map[string]interface{}
diff --git a/services/telemetryrouter/v1api/model_create_telemetry_router_payload.go b/services/telemetryrouter/v1api/model_create_telemetry_router_payload.go
index cfd8bc801..f40faf7ab 100644
--- a/services/telemetryrouter/v1api/model_create_telemetry_router_payload.go
+++ b/services/telemetryrouter/v1api/model_create_telemetry_router_payload.go
@@ -21,7 +21,7 @@ var _ MappedNullable = &CreateTelemetryRouterPayload{}
 // CreateTelemetryRouterPayload struct for CreateTelemetryRouterPayload
 type CreateTelemetryRouterPayload struct {
 	// The description is a longer text chosen by the user to provide more context for the resource.
-	Description *string `json:"description,omitempty"`
+	Description *string `json:"description,omitempty" validate:"regexp=^([a-zA-Z0-9][a-zA-Z0-9 \\\\-]*)?$"`
 	// The display name is a short name chosen by the user to identify the resource.
 	DisplayName          string        `json:"displayName" validate:"regexp=^[a-zA-Z0-9][a-zA-Z0-9 \\\\-]*$"`
 	Filter               *ConfigFilter `json:"filter,omitempty"`
diff --git a/services/telemetryrouter/v1api/model_update_destination_payload.go b/services/telemetryrouter/v1api/model_update_destination_payload.go
index d251fc35c..dbe2bb106 100644
--- a/services/telemetryrouter/v1api/model_update_destination_payload.go
+++ b/services/telemetryrouter/v1api/model_update_destination_payload.go
@@ -21,7 +21,7 @@ var _ MappedNullable = &UpdateDestinationPayload{}
 type UpdateDestinationPayload struct {
 	Config *DestinationConfig `json:"config,omitempty"`
 	// The description is a longer text chosen by the user to provide more context for the resource.
-	Description *string `json:"description,omitempty"`
+	Description *string `json:"description,omitempty" validate:"regexp=^([a-zA-Z0-9][a-zA-Z0-9 \\\\-]*)?$"`
 	// The display name is a short name chosen by the user to identify the resource.
 	DisplayName          *string `json:"displayName,omitempty" validate:"regexp=^[a-zA-Z0-9][a-zA-Z0-9 \\\\-]*$"`
 	AdditionalProperties map[string]interface{}
diff --git a/services/telemetryrouter/v1api/model_update_telemetry_router_payload.go b/services/telemetryrouter/v1api/model_update_telemetry_router_payload.go
index 3769d482d..4ed1bc54b 100644
--- a/services/telemetryrouter/v1api/model_update_telemetry_router_payload.go
+++ b/services/telemetryrouter/v1api/model_update_telemetry_router_payload.go
@@ -20,7 +20,7 @@ var _ MappedNullable = &UpdateTelemetryRouterPayload{}
 // UpdateTelemetryRouterPayload struct for UpdateTelemetryRouterPayload
 type UpdateTelemetryRouterPayload struct {
 	// The description is a longer text chosen by the user to provide more context for the resource.
-	Description *string `json:"description,omitempty"`
+	Description *string `json:"description,omitempty" validate:"regexp=^([a-zA-Z0-9][a-zA-Z0-9 \\\\-]*)?$"`
 	// The display name is a short name chosen by the user to identify the resource.
 	DisplayName          *string       `json:"displayName,omitempty" validate:"regexp=^[a-zA-Z0-9][a-zA-Z0-9 \\\\-]*$"`
 	Filter               *ConfigFilter `json:"filter,omitempty"`