swarm: list an agent's bash tasks from their published status

GET /api/agents/{name}/bash-tasks reads the agent's keys of the bash-task-status
bucket and reports each task's state, command and times, with a live task whose
daemon stopped reporting as stale. The swarm UI shows them in a background tasks
section of the agent card, running ones first. The task output stays unread.

frontend/packages/swarm-ui/src/agent/detail/AgentDetail.tsx

@@ -42,6 +42,7 @@ import {
   startsOpen,
   type DetailSection,
 } from "./sections.js";
+import { BashTasks } from "../terminal/BashTasks.js";
 import { SubagentTerms } from "../terminal/SubagentTerms.js";
 import { WantedMenu } from "../roster/WantedMenu.js";
 import "./AgentDetail.css";
@@ -313,6 +314,8 @@ function SectionBody({
       return <AgentTermPreview agentName={row.name} />;
     case "subagents":
       return <SubagentTerms key={row.name} agentName={row.name} />;
+    case "tasks":
+      return <BashTasks key={row.name} agentName={row.name} />;
   }
 }
 
@@ -324,7 +327,7 @@ export function AgentDetail({
 }: {
   row: AgentRow;
   actions: AgentActions;
-  /** Add the live terminal and subagents sections. */
+  /** Add the live terminal, subagents and background tasks sections. */
   withTerminal?: boolean;
   /**
    * An opened card, whose header already shows the state rows. Without it

frontend/packages/swarm-ui/src/agent/detail/sections.ts

@@ -3,24 +3,30 @@
 // agent's state, message and wanted state, so the sections hold the rest.
 
 /** One folded block of an opened agent card. */
-export type DetailSection = "status" | "terminal" | "subagents" | "settings";
+export type DetailSection =
+  | "status"
+  | "terminal"
+  | "subagents"
+  | "tasks"
+  | "settings";
 
 /** What each section's header says. */
 export const SECTION_TITLE: Record<DetailSection, string> = {
   status: "status",
   terminal: "terminal",
   subagents: "subagents",
+  tasks: "background tasks",
   settings: "settings",
 };
 
 /**
- * The sections a card shows, top to bottom. The terminal and subagents are
+ * The sections a card shows, top to bottom. The terminal, subagents and tasks are
  * left out where the page is already beside a terminal (the terminal page's
  * details popover).
  */
 export function sectionsFor(withTerminal: boolean): DetailSection[] {
   return withTerminal
-    ? ["status", "terminal", "subagents", "settings"]
+    ? ["status", "terminal", "subagents", "tasks", "settings"]
     : ["status", "settings"];
 }
 

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

@@ -0,0 +1,38 @@
+/* <BashTasks> — the rows of an agent's background bash tasks. */
+.ui-bash-tasks-count {
+  margin: 0 0 0.5em;
+  color: var(--muted);
+}
+
+.ui-bash-tasks-list {
+  display: flex;
+  flex-direction: column;
+  gap: 0.35em;
+  margin: 0;
+  padding: 0;
+  list-style: none;
+}
+
+.ui-bash-tasks-item {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) auto auto;
+  align-items: baseline;
+  gap: 0.75em;
+}
+
+.ui-bash-tasks-item-over {
+  opacity: 0.6;
+}
+
+.ui-bash-tasks-cmd {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.ui-bash-tasks-id,
+.ui-bash-tasks-age {
+  color: var(--muted);
+  font-size: 0.85em;
+  white-space: nowrap;
+}

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

@@ -0,0 +1,60 @@
+// <BashTasks> — an agent's background bash tasks, in its card's "background
+// tasks" section: the running ones first, each with its command, what state it
+// is in and since when. The list is `GET /api/agents/{name}/bash-tasks`
+// (`useBashTasks`), which swarm-controller builds from the status each task's
+// bash MCP publishes. Read-only; a task's output is not shown here.
+//
+// Mount it keyed by agent name: the refresh timer is armed once per mount.
+import { ApiErrorPanel } from "@hive/shared/api-error-panel.js";
+import { Hint } from "../../ui/hint/Hint.js";
+import { RelativeTime } from "../../ui/relative-time/RelativeTime.js";
+import { isLive, runningTasksLabel, stateWord } from "./bash-tasks.js";
+import { useBashTasks } from "./useBashTasks.js";
+import "./BashTasks.css";
+
+export function BashTasks({ agentName }: { agentName: string }) {
+  const { tasks, error } = useBashTasks(agentName);
+  return (
+    <section class="ui-bash-tasks" aria-label={`${agentName}'s bash tasks`}>
+      {error && (
+        <ApiErrorPanel
+          problem={error}
+          context={`failed to list ${agentName}'s bash tasks`}
+        />
+      )}
+      {tasks === null ? (
+        error ? null : (
+          <Hint as="span">…</Hint>
+        )
+      ) : tasks.length === 0 ? (
+        <Hint as="span">no background tasks</Hint>
+      ) : (
+        <>
+          <p class="ui-bash-tasks-count">{runningTasksLabel(tasks)}</p>
+          <ul class="ui-bash-tasks-list">
+            {tasks.map((t) => (
+              <li
+                key={t.task}
+                class={`ui-bash-tasks-item${isLive(t) ? "" : " ui-bash-tasks-item-over"}`}
+              >
+                <code class="ui-bash-tasks-cmd" title={t.cmd}>
+                  {t.cmd}
+                </code>
+                <span class="ui-bash-tasks-id">{t.task}</span>
+                <span class="ui-bash-tasks-age">
+                  {stateWord(t)}
+                  {t.state === "stale" ? null : (
+                    <>
+                      {" "}
+                      <RelativeTime epochMs={t.since_unix * 1000} />
+                    </>
+                  )}
+                </span>
+              </li>
+            ))}
+          </ul>
+        </>
+      )}
+    </section>
+  );
+}

frontend/packages/swarm-ui/src/agent/terminal/bash-tasks.ts

@@ -0,0 +1,75 @@
+// What an agent's bash task list means, without a DOM: the wire row, the words
+// for a state, which tasks count as running, and the count's wording. The list
+// is swarm-controller's `GET /api/agents/{name}/bash-tasks`, from the status
+// each task's bash MCP published.
+
+export type TaskState =
+  | "pending"
+  | "running"
+  | "stale"
+  | "done"
+  | "timed_out"
+  | "interrupted"
+  | "killed";
+
+/** One row of `GET /api/agents/{name}/bash-tasks`. */
+export interface BashTask {
+  task: string;
+  /** As of the request: a live task whose daemon stopped reporting is `stale`. */
+  state: TaskState;
+  /** The command, cut to 200 characters. */
+  cmd: string;
+  /** Unix seconds when the task was accepted. */
+  created_unix: number;
+  /** Unix seconds when it entered `state`. */
+  since_unix: number;
+  /** The exit status once the process exited by itself. */
+  exit: number | null;
+}
+
+/** Whether the task is still going: queued or running, and reporting. */
+export function isLive(task: Pick<BashTask, "state">): boolean {
+  return task.state === "pending" || task.state === "running";
+}
+
+/**
+ * The word before a task's age, saying what the age counts from. `done` shows
+ * the exit status when there is one and it is not 0.
+ */
+export function stateWord(task: BashTask): string {
+  switch (task.state) {
+    case "pending":
+      return "queued";
+    case "running":
+      return "started";
+    case "stale":
+      return "stopped reporting";
+    case "done":
+      return task.exit === null || task.exit === 0
+        ? "finished"
+        : `exited ${task.exit}`;
+    case "timed_out":
+      return "timed out";
+    case "interrupted":
+      return "interrupted";
+    case "killed":
+      return "killed";
+  }
+}
+
+/** Live tasks first, then the rest, each newest first; ties by id. */
+export function sortTasks(tasks: BashTask[]): BashTask[] {
+  return [...tasks].sort((a, b) => {
+    const live = Number(isLive(b)) - Number(isLive(a));
+    if (live !== 0) return live;
+    if (a.created_unix !== b.created_unix)
+      return b.created_unix - a.created_unix;
+    return a.task.localeCompare(b.task);
+  });
+}
+
+/** The count of live tasks in words: `1 running task`, `3 running tasks`. */
+export function runningTasksLabel(tasks: BashTask[]): string {
+  const n = tasks.filter(isLive).length;
+  return n === 1 ? "1 running task" : `${n} running tasks`;
+}

frontend/packages/swarm-ui/src/agent/terminal/useBashTasks.ts

@@ -0,0 +1,23 @@
+// An agent's bash tasks, refetched on a timer: `GET /api/agents/{name}/bash-tasks`.
+// `null` until the first answer; a failed fetch sets `error` and keeps the last
+// list. Mount per agent name: the poll belongs to one agent.
+import type { ProblemDetails } from "@hive/shared/api-error.js";
+import { fetchJson, usePolled } from "../../ui/polled/usePolled.js";
+import { sortTasks, type BashTask } from "./bash-tasks.js";
+
+const REFRESH_MS = 10_000;
+
+export function useBashTasks(agentName: string): {
+  tasks: BashTask[] | null;
+  error: ProblemDetails | null;
+} {
+  const { data, error } = usePolled(REFRESH_MS, async (signal) =>
+    sortTasks(
+      await fetchJson<BashTask[]>(
+        `/api/agents/${encodeURIComponent(agentName)}/bash-tasks`,
+        signal,
+      ),
+    ),
+  );
+  return { tasks: data, error };
+}