diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index c7d9293d..feb17b30 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -14,7 +14,8 @@ on:
       - go.sum
 
 jobs:
-  golangci:
+  # https://github.com/golangci/golangci-lint-action/issues/23
+  lint:
     name: lint
     runs-on: ubuntu-latest
     steps:
@@ -24,7 +25,24 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v3
         with:
-          go-version: 1.21
+          go-version-file: './go.mod'
+
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3.3.0
+        with:
+          version: v1.55.2
+
+  fmt:
+    name: fmt
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v3
+
+      - name: Install Go
+        uses: actions/setup-go@v3
+        with:
+          go-version-file: './go.mod'
 
       - name: Restore Go modules cache
         uses: actions/cache@v3
@@ -49,9 +67,3 @@ jobs:
           assert-nothing-changed go fmt ./...
           assert-nothing-changed go mod tidy
           exit $STATUS
-    
-
-      - name: golangci-lint
-        uses: golangci/golangci-lint-action@v3.3.0
-        with:
-          version: v1.52.2
diff --git a/Makefile b/Makefile
index eada2738..bd7214e9 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-GOLANGCI_VERSION=v1.52.2
+GOLANGCI_VERSION=v1.55.2
 COVERAGE=coverage.out
 
 .PHONY: deps
diff --git a/pkg/tidbcloud/pingchat/models/pingchat_chat_info.go b/pkg/tidbcloud/pingchat/models/pingchat_chat_info.go
index 8083e7bc..f3b97ccc 100644
--- a/pkg/tidbcloud/pingchat/models/pingchat_chat_info.go
+++ b/pkg/tidbcloud/pingchat/models/pingchat_chat_info.go
@@ -12,6 +12,7 @@ import (
 	"github.com/go-openapi/errors"
 	"github.com/go-openapi/strfmt"
 	"github.com/go-openapi/swag"
+	"github.com/go-openapi/validate"
 )
 
 // PingchatChatInfo pingchat chat info
@@ -19,7 +20,8 @@ import (
 // swagger:model pingchat.ChatInfo
 type PingchatChatInfo struct {
 
-	// messages
+	// https://pkg.go.dev/gopkg.in/bluesuncorp/validator.v9#hdr-Dive
+	// Required: true
 	Messages []*PingchatChatMessage `json:"messages"`
 }
 
@@ -38,8 +40,9 @@ func (m *PingchatChatInfo) Validate(formats strfmt.Registry) error {
 }
 
 func (m *PingchatChatInfo) validateMessages(formats strfmt.Registry) error {
-	if swag.IsZero(m.Messages) { // not required
-		return nil
+
+	if err := validate.Required("messages", "body", m.Messages); err != nil {
+		return err
 	}
 
 	for i := 0; i < len(m.Messages); i++ {
diff --git a/pkg/tidbcloud/pingchat/models/pingchat_chat_message.go b/pkg/tidbcloud/pingchat/models/pingchat_chat_message.go
index b8f95884..28acf2df 100644
--- a/pkg/tidbcloud/pingchat/models/pingchat_chat_message.go
+++ b/pkg/tidbcloud/pingchat/models/pingchat_chat_message.go
@@ -20,11 +20,11 @@ import (
 // swagger:model pingchat.ChatMessage
 type PingchatChatMessage struct {
 
-	// content
+	// Dialogue content
 	// Required: true
 	Content *string `json:"content"`
 
-	// role
+	// User's input as "user", AI assistant's reply as "assistant"
 	// Required: true
 	// Enum: [user assistant]
 	Role *string `json:"role"`
diff --git a/pkg/tidbcloud/pingchat/models/pingchat_chat_response.go b/pkg/tidbcloud/pingchat/models/pingchat_chat_response.go
index fb888358..7eac357e 100644
--- a/pkg/tidbcloud/pingchat/models/pingchat_chat_response.go
+++ b/pkg/tidbcloud/pingchat/models/pingchat_chat_response.go
@@ -22,7 +22,7 @@ type PingchatChatResponse struct {
 	// content
 	Content string `json:"content,omitempty"`
 
-	// links
+	// Reference Document Links
 	Links []*PingchatLink `json:"links"`
 }