diff --git a/src/features/team-mode/team-runtime/status.test.ts b/src/features/team-mode/team-runtime/status.test.ts
new file mode 100644
index 000000000..1107aff33
--- /dev/null
+++ b/src/features/team-mode/team-runtime/status.test.ts
@@ -0,0 +1,143 @@
+import { afterEach, describe, expect, test } from "bun:test"
+import { randomUUID } from "node:crypto"
+import { mkdir, mkdtemp, rm, writeFile } from "node:fs/promises"
+import { tmpdir } from "node:os"
+import path from "node:path"
+
+import type { BackgroundManager } from "../../background-agent/manager"
+import { TeamModeConfigSchema } from "../../../config/schema/team-mode"
+import type { TeamModeConfig } from "../../../config/schema/team-mode"
+import { createTask } from "../team-tasklist/store"
+import { createTaskInput } from "../team-tasklist/test-support"
+import { getInboxDir, getTasksDir, resolveBaseDir } from "../team-registry/paths"
+import { createRuntimeState, saveRuntimeState } from "../team-state-store/store"
+import { aggregateStatus } from "./status"
+
+async function createTemporaryBaseDir(): Promise<string> {
+  return await mkdtemp(path.join(tmpdir(), "team-mode-status-"))
+}
+
+function createConfig(baseDir: string): TeamModeConfig {
+  return TeamModeConfigSchema.parse({ base_dir: baseDir, enabled: true })
+}
+
+async function seedRuntimeState(baseDir: string, teamName: string, leadSessionId: string, memberSessionIds: string[]): Promise<string> {
+  const config = createConfig(baseDir)
+  const runtimeState = await createRuntimeState(
+    {
+      version: 1,
+      name: teamName,
+      createdAt: Date.now(),
+      leadAgentId: "lead",
+      members: [
+        { kind: "subagent_type", name: "lead", subagent_type: "sisyphus", backendType: "in-process", isActive: true, color: "red" },
+        ...memberSessionIds.map((sessionID, index) => ({
+          kind: "category" as const,
+          name: `member-${index + 1}`,
+          category: "deep" as const,
+          prompt: "implement task",
+          backendType: "in-process" as const,
+          isActive: true,
+          color: index === 0 ? "blue" : "green",
+        })),
+      ],
+    },
+    leadSessionId,
+    "project",
+    config,
+  )
+  const updatedRuntimeState = {
+    ...runtimeState,
+    members: runtimeState.members.map((member, index) => index === 0 ? { ...member, sessionId: leadSessionId, status: "running" as const } : { ...member, sessionId: memberSessionIds[index - 1], status: "running" as const }),
+  }
+  await saveRuntimeState(updatedRuntimeState, config)
+  return updatedRuntimeState.teamRunId
+}
+
+describe("aggregateStatus", () => {
+  const temporaryDirectories: string[] = []
+
+  afterEach(async () => {
+    await Promise.all(temporaryDirectories.splice(0).map(async (directoryPath) => rm(directoryPath, { recursive: true, force: true })))
+  })
+
+  test("surfaces stale locks from claims directory", async () => {
+    // given
+    const baseDir = await createTemporaryBaseDir()
+    temporaryDirectories.push(baseDir)
+    const config = createConfig(baseDir)
+    const teamRunId = await seedRuntimeState(baseDir, "team-gamma", "lead-3", [])
+    const claimsDir = path.join(getTasksDir(resolveBaseDir(config), teamRunId), "claims")
+    await mkdir(claimsDir, { recursive: true })
+    const claimedTask = await createTask(teamRunId, createTaskInput(), config)
+    await writeFile(path.join(claimsDir, `${claimedTask.id}.lock`), "owner\n999999\n1\n")
+
+    // when
+    const result = await aggregateStatus(teamRunId, config)
+
+    // then
+    expect(result.staleLocks).toEqual([path.join(claimsDir, `${claimedTask.id}.lock`)])
+  })
+
+  test("aggregates members plus tasks plus unread counts", async () => {
+    // given
+    const baseDir = await createTemporaryBaseDir()
+    temporaryDirectories.push(baseDir)
+    const config = createConfig(baseDir)
+    const teamRunId = await seedRuntimeState(baseDir, "team-alpha", "lead-1", ["session-a", "session-b"])
+    const inboxDir = getInboxDir(resolveBaseDir(config), teamRunId, "member-1")
+    await mkdir(inboxDir, { recursive: true })
+    await writeFile(path.join(inboxDir, "1.json"), JSON.stringify({ version: 1, messageId: randomUUID(), from: "lead", to: "member-1", kind: "message", body: "a", timestamp: 1 }) + "\n")
+    await writeFile(path.join(inboxDir, "2.json"), JSON.stringify({ version: 1, messageId: randomUUID(), from: "lead", to: "member-1", kind: "message", body: "b", timestamp: 2 }) + "\n")
+    await createTask(teamRunId, createTaskInput({ subject: "a" }), config)
+    await createTask(teamRunId, createTaskInput({ subject: "b" }), config)
+    await createTask(teamRunId, createTaskInput({ subject: "c" }), config)
+    await createTask(teamRunId, createTaskInput({ subject: "d" }), config)
+
+    // when
+    const result = await aggregateStatus(teamRunId, config)
+
+    // then
+    expect(result.teamName).toBe("team-alpha")
+    expect(result.members).toEqual([
+      expect.objectContaining({ name: "lead", unreadMessages: 0 }),
+      expect.objectContaining({ name: "member-1", unreadMessages: 2 }),
+      expect.objectContaining({ name: "member-2", unreadMessages: 0 }),
+    ])
+    expect(Object.keys(result.members[0] ?? {})).toEqual(expect.arrayContaining(["name", "unreadMessages"]))
+    expect(result.tasks).toEqual({ pending: 4, claimed: 0, in_progress: 0, completed: 0, deleted: 0, total: 4 })
+  })
+
+  test("surfaces queued and running counts on same model", async () => {
+    // given
+    const baseDir = await createTemporaryBaseDir()
+    temporaryDirectories.push(baseDir)
+    const config = createConfig(baseDir)
+    const teamRunId = await seedRuntimeState(baseDir, "team-beta", "lead-2", [])
+    const backgroundManager = {
+      getTasksByParentSession: () => [
+        { status: "running", model: { providerID: "anthropic", modelID: "claude-opus-4-7" } },
+        { status: "running", model: { providerID: "anthropic", modelID: "claude-opus-4-7" } },
+        { status: "running", model: { providerID: "anthropic", modelID: "claude-opus-4-7" } },
+        { status: "running", model: { providerID: "anthropic", modelID: "claude-opus-4-7" } },
+        { status: "running", model: { providerID: "anthropic", modelID: "claude-opus-4-7" } },
+        { status: "pending", model: { providerID: "anthropic", modelID: "claude-opus-4-7" } },
+        { status: "pending", model: { providerID: "anthropic", modelID: "claude-opus-4-7" } },
+        { status: "pending", model: { providerID: "anthropic", modelID: "claude-opus-4-7" } },
+      ],
+      getConcurrencyCounts: () => ({ running: 5, queued: 3 }),
+      listTasksByParentSession: () => [{}, {}, {}, {}],
+    } satisfies Pick<BackgroundManager, "getTasksByParentSession"> & {
+      getConcurrencyCounts?: (modelOrUndefined?: string) => { running: number; queued: number }
+      listTasksByParentSession?: (sessionID: string) => unknown[]
+    }
+
+    // when
+    const result = await aggregateStatus(teamRunId, config, backgroundManager)
+
+    // then
+    expect(result.concurrency.runningOnSameModel).toBe(5)
+    expect(result.concurrency.queuedOnSameModel).toBe(3)
+    expect(result.concurrency.teamRunIdSpecific).toBe(4)
+  })
+})
diff --git a/src/features/team-mode/team-runtime/status.ts b/src/features/team-mode/team-runtime/status.ts
new file mode 100644
index 000000000..edaddc914
--- /dev/null
+++ b/src/features/team-mode/team-runtime/status.ts
@@ -0,0 +1,155 @@
+import type { BackgroundManager } from "../../background-agent/manager"
+import type { TeamModeConfig } from "../../../config/schema/team-mode"
+import type { RuntimeState, Task } from "../types"
+import { detectStaleLock } from "../team-state-store/locks"
+import { loadRuntimeState } from "../team-state-store/store"
+import { listUnreadMessages } from "../team-mailbox/inbox"
+import { listTasks } from "../team-tasklist/list"
+import { getTasksDir, resolveBaseDir } from "../team-registry/paths"
+import { readdir } from "node:fs/promises"
+import path from "node:path"
+
+export interface TeamStatus {
+  teamName: string
+  teamRunId: string
+  status: RuntimeState["status"]
+  leadSessionId?: string
+  createdAt: number
+  members: Array<{
+    name: string
+    sessionId?: string
+    status: RuntimeState["members"][number]["status"]
+    color?: string
+    worktreePath?: string
+    unreadMessages: number
+    paneId?: string
+  }>
+  tasks: {
+    pending: number
+    claimed: number
+    in_progress: number
+    completed: number
+    deleted: number
+    total: number
+  }
+  shutdownRequests: RuntimeState["shutdownRequests"]
+  concurrency: {
+    runningOnSameModel: number
+    queuedOnSameModel: number
+    teamRunIdSpecific?: number
+  }
+  bounds: RuntimeState["bounds"]
+  staleLocks: string[]
+}
+
+type ConcurrencyCounts = {
+  running: number
+  queued: number
+}
+
+type TeamBackgroundManager = BackgroundManager & {
+  getConcurrencyCounts?: (modelOrUndefined?: string) => ConcurrencyCounts
+  listTasksByParentSession?: (sessionID: string) => Array<unknown>
+}
+
+function getPrimaryModelKey(bgMgr: TeamBackgroundManager | undefined, leadSessionId: string | undefined): string | undefined {
+  if (!bgMgr || !leadSessionId) return undefined
+
+  const tasksByParent = bgMgr.getTasksByParentSession(leadSessionId)
+  if (tasksByParent.length === 0) return undefined
+
+  const firstModel = tasksByParent[0]?.model
+  if (!firstModel) return undefined
+
+  return `${firstModel.providerID}/${firstModel.modelID}`
+}
+
+function countTasks(tasks: Task[]): TeamStatus["tasks"] {
+  const counts = {
+    pending: 0,
+    claimed: 0,
+    in_progress: 0,
+    completed: 0,
+    deleted: 0,
+    total: 0,
+  }
+
+  for (const task of tasks) {
+    counts[task.status] += 1
+    counts.total += 1
+  }
+
+  return counts
+}
+
+function resolveConcurrencyCounts(bgMgr: TeamBackgroundManager | undefined, leadSessionId: string | undefined): ConcurrencyCounts {
+  if (!bgMgr || !leadSessionId) return { running: 0, queued: 0 }
+
+  const modelKey = getPrimaryModelKey(bgMgr, leadSessionId)
+  const tasksByParent = bgMgr.getTasksByParentSession(leadSessionId)
+  const counts = bgMgr.getConcurrencyCounts?.(modelKey)
+
+  if (counts) {
+    return { running: counts.running, queued: counts.queued }
+  }
+
+  const running = tasksByParent.filter((task) => task.status === "running").length
+  const queued = tasksByParent.filter((task) => task.status === "pending").length
+
+  return { running, queued }
+}
+
+export async function aggregateStatus(
+  teamRunId: string,
+  config: TeamModeConfig,
+  bgMgr?: BackgroundManager,
+): Promise<TeamStatus> {
+  const runtimeState = await loadRuntimeState(teamRunId, config)
+  const unreadCounts = await Promise.all(
+    runtimeState.members.map(async (member) => ({
+      member,
+      unreadMessages: (await listUnreadMessages(teamRunId, member.name, config)).length,
+    })),
+  )
+  const tasks = await listTasks(teamRunId, config)
+  const teamBackgroundManager: TeamBackgroundManager | undefined = bgMgr
+  const concurrencyCounts = resolveConcurrencyCounts(teamBackgroundManager, runtimeState.leadSessionId)
+  const teamRunIdSpecific = teamBackgroundManager?.listTasksByParentSession?.(runtimeState.leadSessionId ?? teamRunId)?.length
+  const baseDir = resolveBaseDir(config)
+  const claimsDir = path.join(getTasksDir(baseDir, teamRunId), "claims")
+  const staleLockEntries = await readdir(claimsDir, { withFileTypes: true }).catch(() => [])
+  const staleLockPaths = await Promise.all(
+    staleLockEntries
+      .filter((entry) => entry.isFile() && entry.name.endsWith(".lock"))
+      .map(async (entry) => {
+        const lockPath = path.join(claimsDir, entry.name)
+        return (await detectStaleLock(lockPath, 300_000)) ? lockPath : undefined
+      }),
+  )
+
+  return {
+    teamName: runtimeState.teamName,
+    teamRunId: runtimeState.teamRunId,
+    status: runtimeState.status,
+    leadSessionId: runtimeState.leadSessionId,
+    createdAt: runtimeState.createdAt,
+    members: unreadCounts.map(({ member, unreadMessages }) => ({
+      name: member.name,
+      sessionId: member.sessionId,
+      status: member.status,
+      color: member.color,
+      worktreePath: member.worktreePath,
+      unreadMessages,
+      paneId: member.tmuxPaneId,
+    })),
+    tasks: countTasks(tasks),
+    shutdownRequests: runtimeState.shutdownRequests,
+    concurrency: {
+      runningOnSameModel: concurrencyCounts.running,
+      queuedOnSameModel: concurrencyCounts.queued,
+      teamRunIdSpecific,
+    },
+    bounds: runtimeState.bounds,
+    staleLocks: staleLockPaths.filter((lockPath): lockPath is string => lockPath !== undefined),
+  }
+}