Finalize inbox artifacts and error protocol

internal/cli/inbox/update.go

@@ -18,6 +18,7 @@ type updateOptions struct {
 	body        string
 	bodyFile    string
 	payloadJSON string
+	artifacts   artifactOptions
 }
 
 func newUpdateCmd(root *rootOptions) *cobra.Command {
@@ -34,13 +35,17 @@ func newUpdateCmd(root *rootOptions) *cobra.Command {
 				agent = root.agent
 			}
 			if agent == "" {
-				return fmt.Errorf("agent is required")
+				return protocol.InvalidInput("agent is required", nil)
 			}
 
 			body, err := resolveBodyValue(opts.body, opts.bodyFile)
 			if err != nil {
 				return err
 			}
+			artifacts, err := resolveArtifacts(opts.artifacts)
+			if err != nil {
+				return err
+			}
 
 			sqlDB, err := db.Open(ctx, root.dbPath)
 			if err != nil {
@@ -56,6 +61,7 @@ func newUpdateCmd(root *rootOptions) *cobra.Command {
 				Summary:     opts.summary,
 				Body:        body,
 				PayloadJSON: opts.payloadJSON,
+				Artifacts:   artifacts,
 			})
 			if err != nil {
 				return err
@@ -86,6 +92,7 @@ func newUpdateCmd(root *rootOptions) *cobra.Command {
 	cmd.Flags().StringVar(&opts.body, "body", "", "Update body")
 	cmd.Flags().StringVar(&opts.bodyFile, "body-file", "", "Read update body from file")
 	cmd.Flags().StringVar(&opts.payloadJSON, "payload-json", "", "Structured payload JSON string")
+	addArtifactFlags(cmd, &opts.artifacts)
 
 	_ = cmd.MarkFlagRequired("thread")
 	_ = cmd.MarkFlagRequired("status")