feat(progress): humanize subagent updates

src/tool.ts

@@ -9,6 +9,7 @@ import {
   type SubagentRunResult,
   type SubagentToolDetails,
 } from "./schema.ts";
+import { createProgressFormatter } from "./progress.mjs";
 
 const MAX_PARALLEL_TASKS = 8;
 const MAX_CONCURRENCY = 4;
@@ -141,11 +142,15 @@ export function createSubagentTool(deps: {
           topLevelModel: params.model,
         });
 
+        const progressFormatter = createProgressFormatter();
+
         return deps.runSingleTask?.({
           cwd: input.cwd ?? ctx.cwd,
           onEvent(event) {
+            const text = progressFormatter.format(event);
+            if (!text) return;
             onUpdate?.({
-              content: [{ type: "text", text: `Running subagent: ${event.type}` }],
+              content: [{ type: "text", text }],
               details: makeDetails(input.mode, []),
             });
           },