add reasoning_delta event

Author: charleslien

common/src/types/print-mode.ts

@@ -88,6 +88,16 @@ export type PrintModeSubagentFinish = z.infer<
   typeof printModeSubagentFinishSchema
 >
 
+export const printModeReasoningDeltaSchema = z.object({
+  type: z.literal('reasoning_delta'),
+  text: z.string(),
+  ancestorRunIds: z.string().array(),
+  runId: z.string(),
+})
+export type PrintModeReasoningDelta = z.infer<
+  typeof printModeReasoningDeltaSchema
+>
+
 export const printModeEventSchema = z.discriminatedUnion('type', [
   printModeDownloadStatusSchema,
   printModeErrorSchema,
@@ -99,6 +109,8 @@ export const printModeEventSchema = z.discriminatedUnion('type', [
   printModeTextSchema,
   printModeToolCallSchema,
   printModeToolResultSchema,
+
+  printModeReasoningDeltaSchema,
 ])
 
 export type PrintModeEvent = z.infer<typeof printModeEventSchema>

npm-app/src/client.ts

@@ -1154,7 +1154,11 @@ export class Client {
         } else {
           printModeLog(chunk)
           printSubagentHeader(chunk)
-          if (chunk.type === 'reasoning' && chunk.text) {
+          if (
+            (chunk.type === 'reasoning' && chunk.text) ||
+            (chunk.type === 'reasoning_delta' &&
+              chunk.ancestorRunIds.length === 0)
+          ) {
             if (!this.streamStarted) {
               this.streamStarted = true
               onStreamStart()