Finalize inbox artifacts and error protocol

internal/cli/inbox/done.go

@@ -17,6 +17,7 @@ type completeOptions struct {
 	body        string
 	bodyFile    string
 	payloadJSON string
+	artifacts   artifactOptions
 }
 
 func newDoneCmd(root *rootOptions) *cobra.Command {
@@ -41,13 +42,17 @@ func newCompleteCmd(root *rootOptions, mode string) *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 {
@@ -63,6 +68,7 @@ func newCompleteCmd(root *rootOptions, mode string) *cobra.Command {
 				Body:        body,
 				PayloadJSON: opts.payloadJSON,
 				Failed:      mode == "fail",
+				Artifacts:   artifacts,
 			})
 			if err != nil {
 				return err
@@ -92,6 +98,7 @@ func newCompleteCmd(root *rootOptions, mode string) *cobra.Command {
 	cmd.Flags().StringVar(&opts.body, "body", "", "Completion body")
 	cmd.Flags().StringVar(&opts.bodyFile, "body-file", "", "Read completion body from file")
 	cmd.Flags().StringVar(&opts.payloadJSON, "payload-json", "", "Structured payload JSON string")
+	addArtifactFlags(cmd, &opts.artifacts)
 
 	_ = cmd.MarkFlagRequired("thread")
 	_ = cmd.MarkFlagRequired("summary")