subagents publish their model and effort as headers on every row, and the swarm shows them

The subagent daemon stamps Swarm-Model and Swarm-Effort on each row it
publishes. The list endpoint reads them off the newest row it already fetches,
so a long-running subagent keeps them past the stream's 24 hour window, and the
terminal page's menu and the agent panel's list show them beside the name.

frontend/packages/swarm-ui/src/agent/terminal/SubagentTerms.tsx

@@ -12,7 +12,7 @@ import { useEffect, useState } from "preact/hooks";
 import { ApiErrorPanel } from "@hive/shared/api-error-panel.js";
 import { Badge } from "@hive/shared/badge.js";
 import { AgentTermPreview } from "./AgentTermPreview.js";
-import { STALE_S, stillListed } from "./subagent-list.js";
+import { STALE_S, runLabel, stillListed } from "./subagent-list.js";
 import { useSubagentList } from "./useSubagentList.js";
 import { RelativeTime } from "../../ui/relative-time/RelativeTime.js";
 import "./SubagentTerms.css";
@@ -41,7 +41,9 @@ export function SubagentTerms({ agentName }: { agentName: string }) {
     <section class="ui-subagent-terms" aria-label={`${agentName}'s subagents`}>
       <div class="ui-subagent-terms-list">
         <span class="ui-subagent-terms-heading">subagents</span>
-        {subagents?.map(({ name, last_row_unix }) => {
+        {subagents?.map((sub) => {
+          const { name, last_row_unix } = sub;
+          const runs = runLabel(sub);
           const stale =
             last_row_unix !== null && nowS - last_row_unix > STALE_S;
           return (
@@ -60,6 +62,7 @@ export function SubagentTerms({ agentName }: { agentName: string }) {
                 }
                 onClick={() => setPicked(name === selected ? null : name)}
               />
+              {runs && <span class="ui-subagent-terms-age">{runs}</span>}
               {last_row_unix !== null && (
                 <span class="ui-subagent-terms-age">
                   <RelativeTime epochMs={last_row_unix * 1000} />

frontend/packages/swarm-ui/src/agent/terminal/SubagentsMenu.css

@@ -45,3 +45,9 @@
 .ui-subagents-menu-back {
   color: var(--blue);
 }
+
+/* What it runs sits after the name, not centred between name and age. */
+.ui-subagents-menu-run {
+  margin-right: auto;
+  margin-left: 0.6em;
+}

frontend/packages/swarm-ui/src/agent/terminal/SubagentsMenu.tsx

@@ -17,7 +17,12 @@ import { Panel } from "../../ui/panel/Panel.js";
 import { Popover } from "../../ui/popover/Popover.js";
 import { RelativeTime } from "../../ui/relative-time/RelativeTime.js";
 import { termPaths } from "./AgentTermPreview.js";
-import { runningLabel, splitRunning, type Subagent } from "./subagent-list.js";
+import {
+  runLabel,
+  runningLabel,
+  splitRunning,
+  type Subagent,
+} from "./subagent-list.js";
 import { useSubagentList } from "./useSubagentList.js";
 import "./SubagentsMenu.css";
 
@@ -41,6 +46,11 @@ function Entry({
         aria-current={current ? "page" : undefined}
       >
         <span class="ui-subagents-menu-name">{sub.name}</span>
+        {runLabel(sub) && (
+          <span class="ui-subagents-menu-age ui-subagents-menu-run">
+            {runLabel(sub)}
+          </span>
+        )}
         {sub.last_row_unix !== null && (
           <span class="ui-subagents-menu-age">
             <RelativeTime epochMs={sub.last_row_unix * 1000} />

frontend/packages/swarm-ui/src/agent/terminal/subagent-list.ts

@@ -8,6 +8,19 @@ export interface Subagent {
   name: string;
   /** Unix seconds of its newest terminal row, `null` when not readable. */
   last_row_unix: number | null;
+  /** The model it runs; `null` on the harness's default or when not readable. */
+  model: string | null;
+  /** Its reasoning effort; `null` when not readable. */
+  effort: string | null;
+}
+
+/**
+ * What a subagent runs, as one short label: `opus · high`. Whichever of the
+ * two the controller could not read is left out, and an empty string means
+ * there is nothing to show.
+ */
+export function runLabel(sub: Pick<Subagent, "model" | "effort">): string {
+  return [sub.model, sub.effort].filter((v) => v).join(" · ");
 }
 
 /** A subagent quiet for longer than this is no longer counted as running. */