Handle skill tool details and skip synthetic timeline events

packages/server/src/shared/messages.ts

@@ -210,6 +210,11 @@ const ToolCallDetailPayloadSchema: z.ZodType<ToolCallDetail> = z.discriminatedUn
       })
     ),
   }),
+  z.object({
+    type: z.literal('plain_text'),
+    label: z.string().optional(),
+    text: z.string().optional(),
+  }),
   z.object({
     type: z.literal('unknown'),
     input: UnknownValueSchema,

packages/server/src/shared/tool-call-display.ts

@@ -91,6 +91,9 @@ export function buildToolCallDisplayModel(input: ToolCallDisplayInput): ToolCall
       displayName = readString(input.detail.subAgentType) ?? "Task";
       summary = readString(input.detail.description);
       break;
+    case "plain_text":
+      summary = input.detail.label;
+      break;
     case "unknown":
       break;
   }