diff --git a/shortcuts/whiteboard/whiteboard_query.go b/shortcuts/whiteboard/whiteboard_query.go
index e650ecb45..4b9520564 100644
--- a/shortcuts/whiteboard/whiteboard_query.go
+++ b/shortcuts/whiteboard/whiteboard_query.go
@@ -167,7 +167,8 @@ type exportResp struct {
 	} `json:"data"`
 }
 
-// exportWhiteboardSvg exports a whiteboard as SVG and writes it to stdout or a file.
+// exportWhiteboardSvg exports a whiteboard as SVG and writes the result to stdout or a file.
+// It requests the SVG export for the given whiteboard token and saves the decoded content when an output path is provided.
 func exportWhiteboardSvg(runtime *common.RuntimeContext, wbToken, outDir string) error {
 	reqBody := exportReq{ExportType: "svg"}
 	req := &larkcore.ApiReq{
@@ -238,6 +239,10 @@ func exportWhiteboardSvg(runtime *common.RuntimeContext, wbToken, outDir string)
 	return nil
 }
 
+// exportWhiteboardPreview downloads a whiteboard preview image and saves it as a PNG file.
+//
+// It reports the saved file path and image size on success.
+// Returns an error if the API request fails, the response is rejected, or the file cannot be saved.
 func exportWhiteboardPreview(ctx context.Context, runtime *common.RuntimeContext, wbToken, outDir string) error {
 	req := &larkcore.ApiReq{
 		HttpMethod: http.MethodGet,
@@ -439,6 +444,9 @@ func exportWhiteboardRaw(runtime *common.RuntimeContext, wbToken, outDir string)
 	return nil
 }
 
+// saveOutputFile writes exported content to a file or directory and returns the final path and written size.
+// If outPath is a directory, it creates a file named whiteboard_<token><ext>. If outPath is a file path,
+// it adjusts the file extension to ext, validates the path, and respects the overwrite flag.
 func saveOutputFile(outPath, ext, token string, runtime *common.RuntimeContext, data io.Reader) (string, int64, error) {
 	// Step 1: Get final output path
 	info, err := runtime.FileIO().Stat(outPath)
diff --git a/shortcuts/whiteboard/whiteboard_update.go b/shortcuts/whiteboard/whiteboard_update.go
index 2afcf752b..fa5eefb9d 100644
--- a/shortcuts/whiteboard/whiteboard_update.go
+++ b/shortcuts/whiteboard/whiteboard_update.go
@@ -44,6 +44,11 @@ var wbUpdateFlags = []common.Flag{
 	{Name: "input_format", Desc: "format of input data: raw | plantuml | mermaid | svg. Default is raw.", Required: false},
 }
 
+// wbUpdateValidate validates the whiteboard update command arguments.
+//
+// It checks the whiteboard token and idempotent token for dangerous control
+// characters, enforces a minimum length for a non-empty idempotent token, and
+// ensures the input format is one of raw, plantuml, mermaid, or svg.
 func wbUpdateValidate(ctx context.Context, runtime *common.RuntimeContext) error {
 	// 检查 token 是否包含控制字符（空字符串下自动跳过了）
 	if err := common.RejectDangerousCharsTyped("--whiteboard-token", runtime.Str("whiteboard-token")); err != nil {
@@ -74,6 +79,8 @@ func getFormat(runtime *common.RuntimeContext) string {
 	return format
 }
 
+// wbUpdateDryRun describes the HTTP request used to update a whiteboard.
+// It returns a failure description when source is missing or cannot be parsed.
 func wbUpdateDryRun(ctx context.Context, runtime *common.RuntimeContext) *common.DryRunAPI {
 	// 读取输入内容
 	input := runtime.Str("source")
@@ -112,6 +119,10 @@ func wbUpdateDryRun(ctx context.Context, runtime *common.RuntimeContext) *common
 	return desc
 }
 
+// wbUpdateExecute updates a whiteboard from the supplied source input.
+// It requires --source and dispatches to the raw node update path for raw input
+// or the diagram import path for PlantUML, Mermaid, and SVG input.
+// It returns an error if the source is missing or the input format is unsupported.
 func wbUpdateExecute(ctx context.Context, runtime *common.RuntimeContext) error {
 	token := runtime.Str("whiteboard-token")
 	overwrite := runtime.Bool("overwrite")