diff --git a/src/tools/agent-teams/messaging-tools.test.ts b/src/tools/agent-teams/messaging-tools.test.ts
new file mode 100644
index 00000000..3d4e72fb
--- /dev/null
+++ b/src/tools/agent-teams/messaging-tools.test.ts
@@ -0,0 +1,179 @@
+/// <reference types="bun-types" />
+import { afterEach, beforeEach, describe, expect, test } from "bun:test"
+import { mkdtempSync, rmSync } from "node:fs"
+import { tmpdir } from "node:os"
+import { join } from "node:path"
+import type { BackgroundManager } from "../../features/background-agent"
+import { createAgentTeamsTools } from "./tools"
+
+interface TestToolContext {
+  sessionID: string
+  messageID: string
+  agent: string
+  abort: AbortSignal
+}
+
+interface ResumeCall {
+  sessionId: string
+  prompt: string
+}
+
+function createContext(sessionID = "ses-main"): TestToolContext {
+  return {
+    sessionID,
+    messageID: "msg-main",
+    agent: "sisyphus",
+    abort: new AbortController().signal,
+  }
+}
+
+async function executeJsonTool(
+  tools: ReturnType<typeof createAgentTeamsTools>,
+  toolName: keyof ReturnType<typeof createAgentTeamsTools>,
+  args: Record<string, unknown>,
+  context: TestToolContext,
+): Promise<unknown> {
+  const output = await tools[toolName].execute(args, context)
+  return JSON.parse(output)
+}
+
+function createManagerWithImmediateResume(): { manager: BackgroundManager; resumeCalls: ResumeCall[] } {
+  const resumeCalls: ResumeCall[] = []
+  let launchCount = 0
+
+  const manager = {
+    launch: async () => {
+      launchCount += 1
+      return { id: `bg-${launchCount}`, sessionID: `ses-worker-${launchCount}` }
+    },
+    getTask: () => undefined,
+    resume: async (args: ResumeCall) => {
+      resumeCalls.push(args)
+      return { id: `resume-${resumeCalls.length}` }
+    },
+  } as unknown as BackgroundManager
+
+  return { manager, resumeCalls }
+}
+
+function createManagerWithDeferredResume(): {
+  manager: BackgroundManager
+  resumeCalls: ResumeCall[]
+  resolveAllResumes: () => void
+} {
+  const resumeCalls: ResumeCall[] = []
+  const pendingResolves: Array<() => void> = []
+  let launchCount = 0
+
+  const manager = {
+    launch: async () => {
+      launchCount += 1
+      return { id: `bg-${launchCount}`, sessionID: `ses-worker-${launchCount}` }
+    },
+    getTask: () => undefined,
+    resume: (args: ResumeCall) => {
+      resumeCalls.push(args)
+      return new Promise<{ id: string }>((resolve) => {
+        pendingResolves.push(() => resolve({ id: `resume-${resumeCalls.length}` }))
+      })
+    },
+  } as unknown as BackgroundManager
+
+  return {
+    manager,
+    resumeCalls,
+    resolveAllResumes: () => {
+      while (pendingResolves.length > 0) {
+        const next = pendingResolves.shift()
+        next?.()
+      }
+    },
+  }
+}
+
+describe("agent-teams messaging tools", () => {
+  let originalCwd: string
+  let tempProjectDir: string
+
+  beforeEach(() => {
+    originalCwd = process.cwd()
+    tempProjectDir = mkdtempSync(join(tmpdir(), "agent-teams-messaging-"))
+    process.chdir(tempProjectDir)
+  })
+
+  afterEach(() => {
+    process.chdir(originalCwd)
+    rmSync(tempProjectDir, { recursive: true, force: true })
+  })
+
+  test("send_message rejects recipient team suffix mismatch", async () => {
+    //#given
+    const { manager, resumeCalls } = createManagerWithImmediateResume()
+    const tools = createAgentTeamsTools(manager)
+    const leadContext = createContext()
+    await executeJsonTool(tools, "team_create", { team_name: "core" }, leadContext)
+    await executeJsonTool(
+      tools,
+      "spawn_teammate",
+      { team_name: "core", name: "worker_1", prompt: "Handle release prep", category: "quick" },
+      leadContext,
+    )
+
+    //#when
+    const mismatchedRecipient = await executeJsonTool(
+      tools,
+      "send_message",
+      {
+        team_name: "core",
+        type: "message",
+        recipient: "worker_1@other-team",
+        summary: "sync",
+        content: "Please update status.",
+      },
+      leadContext,
+    ) as { error?: string }
+
+    //#then
+    expect(mismatchedRecipient.error).toBe("recipient_team_mismatch")
+    expect(resumeCalls).toHaveLength(0)
+  })
+
+  test("broadcast schedules teammate resumes without serial await", async () => {
+    //#given
+    const { manager, resumeCalls, resolveAllResumes } = createManagerWithDeferredResume()
+    const tools = createAgentTeamsTools(manager)
+    const leadContext = createContext()
+    await executeJsonTool(tools, "team_create", { team_name: "core" }, leadContext)
+
+    for (const name of ["worker_1", "worker_2", "worker_3"]) {
+      await executeJsonTool(
+        tools,
+        "spawn_teammate",
+        { team_name: "core", name, prompt: "Handle release prep", category: "quick" },
+        leadContext,
+      )
+    }
+
+    //#when
+    const broadcastPromise = executeJsonTool(
+      tools,
+      "send_message",
+      { team_name: "core", type: "broadcast", summary: "sync", content: "Please update status." },
+      leadContext,
+    ) as Promise<{ success?: boolean; message?: string }>
+
+    await Promise.resolve()
+    await Promise.resolve()
+
+    //#then
+    expect(resumeCalls).toHaveLength(3)
+
+    //#when
+    resolveAllResumes()
+    const broadcastResult = await broadcastPromise
+
+    //#then
+    expect(broadcastResult.success).toBe(true)
+    expect(broadcastResult.message).toBe("broadcast_sent:3")
+  })
+})
diff --git a/src/tools/agent-teams/messaging-tools.ts b/src/tools/agent-teams/messaging-tools.ts
index 8010b613..43add646 100644
--- a/src/tools/agent-teams/messaging-tools.ts
+++ b/src/tools/agent-teams/messaging-tools.ts
@@ -16,6 +16,25 @@ function nowIso(): string {
   return new Date().toISOString()
 }
 
+function validateRecipientTeam(recipient: unknown, teamName: string): string | null {
+  if (typeof recipient !== "string") {
+    return null
+  }
+
+  const trimmed = recipient.trim()
+  const atIndex = trimmed.indexOf("@")
+  if (atIndex <= 0) {
+    return null
+  }
+
+  const specifiedTeam = trimmed.slice(atIndex + 1).trim()
+  if (!specifiedTeam || specifiedTeam === teamName) {
+    return null
+  }
+
+  return "recipient_team_mismatch"
+}
+
 function resolveSenderFromContext(config: TeamConfig, context: TeamToolContext): string | null {
   if (context.sessionID === config.leadSessionId) {
     return "team-lead"
@@ -45,6 +64,10 @@ export function createSendMessageTool(manager: BackgroundManager): ToolDefinitio
         if (teamError) {
           return JSON.stringify({ error: teamError })
         }
+        const recipientTeamError = validateRecipientTeam(args.recipient, input.team_name)
+        if (recipientTeamError) {
+          return JSON.stringify({ error: recipientTeamError })
+        }
         const requestedSender = input.sender
         const senderError = requestedSender ? validateAgentNameOrLead(requestedSender) : null
         if (senderError) {
@@ -88,11 +111,16 @@ export function createSendMessageTool(manager: BackgroundManager): ToolDefinitio
           if (!input.summary) {
             return JSON.stringify({ error: "broadcast_requires_summary" })
           }
+          const broadcastSummary = input.summary
           const teammates = listTeammates(config)
           for (const teammate of teammates) {
-            sendPlainInboxMessage(input.team_name, sender, teammate.name, input.content ?? "", input.summary)
-            await resumeTeammateWithMessage(manager, context, input.team_name, teammate, input.summary, input.content ?? "")
+            sendPlainInboxMessage(input.team_name, sender, teammate.name, input.content ?? "", broadcastSummary)
           }
+          await Promise.allSettled(
+            teammates.map((teammate) =>
+              resumeTeammateWithMessage(manager, context, input.team_name, teammate, broadcastSummary, input.content ?? ""),
+            ),
+          )
           return JSON.stringify({ success: true, message: `broadcast_sent:${teammates.length}` })
         }
 
diff --git a/src/tools/agent-teams/team-config-store.test.ts b/src/tools/agent-teams/team-config-store.test.ts
index d1f9c1f4..254056ab 100644
--- a/src/tools/agent-teams/team-config-store.test.ts
+++ b/src/tools/agent-teams/team-config-store.test.ts
@@ -1,6 +1,6 @@
 /// <reference types="bun-types" />
 import { afterEach, beforeEach, describe, expect, test } from "bun:test"
-import { mkdtempSync, rmSync } from "node:fs"
+import { mkdtempSync, readFileSync, rmSync } from "node:fs"
 import { tmpdir } from "node:os"
 import { join } from "node:path"
 import { acquireLock } from "../../features/claude-tasks/storage"
@@ -68,4 +68,22 @@ describe("agent-teams team config store", () => {
     //#then
     expect(teamExists("core")).toBe(false)
   })
+
+  test("deleteTeamData removes task files before team files", () => {
+    //#given
+    const sourceUrl = new URL("./team-config-store.ts", import.meta.url)
+    const source = readFileSync(sourceUrl, "utf-8")
+    const deleteFnStart = source.indexOf("export function deleteTeamData")
+    const deleteFnSlice = deleteFnStart >= 0 ? source.slice(deleteFnStart, deleteFnStart + 700) : ""
+
+    //#when
+    const taskDeleteIndex = deleteFnSlice.indexOf("rmSync(taskDir")
+    const teamDeleteIndex = deleteFnSlice.indexOf("rmSync(teamDir")
+
+    //#then
+    expect(deleteFnStart).toBeGreaterThanOrEqual(0)
+    expect(taskDeleteIndex).toBeGreaterThanOrEqual(0)
+    expect(teamDeleteIndex).toBeGreaterThanOrEqual(0)
+    expect(taskDeleteIndex).toBeLessThan(teamDeleteIndex)
+  })
 })
diff --git a/src/tools/agent-teams/team-config-store.ts b/src/tools/agent-teams/team-config-store.ts
index b916f24f..7c733e53 100644
--- a/src/tools/agent-teams/team-config-store.ts
+++ b/src/tools/agent-teams/team-config-store.ts
@@ -179,13 +179,13 @@ export function deleteTeamData(teamName: string): void {
       const teamDir = getTeamDir(teamName)
       const taskDir = getTeamTaskDir(teamName)
 
-      if (existsSync(teamDir)) {
-        rmSync(teamDir, { recursive: true, force: true })
-      }
-
       if (existsSync(taskDir)) {
         rmSync(taskDir, { recursive: true, force: true })
       }
+
+      if (existsSync(teamDir)) {
+        rmSync(teamDir, { recursive: true, force: true })
+      }
     })
   })
 }
diff --git a/src/tools/agent-teams/team-lifecycle-tools.test.ts b/src/tools/agent-teams/team-lifecycle-tools.test.ts
new file mode 100644
index 00000000..cffbb1e6
--- /dev/null
+++ b/src/tools/agent-teams/team-lifecycle-tools.test.ts
@@ -0,0 +1,69 @@
+/// <reference types="bun-types" />
+import { afterEach, beforeEach, describe, expect, test } from "bun:test"
+import { existsSync, mkdtempSync, rmSync } from "node:fs"
+import { tmpdir } from "node:os"
+import { join } from "node:path"
+import type { BackgroundManager } from "../../features/background-agent"
+import { getTeamDir } from "./paths"
+import { createAgentTeamsTools } from "./tools"
+
+interface TestToolContext {
+  sessionID: string
+  messageID: string
+  agent: string
+  abort: AbortSignal
+}
+
+function createContext(sessionID = "ses-main"): TestToolContext {
+  return {
+    sessionID,
+    messageID: "msg-main",
+    agent: "sisyphus",
+    abort: new AbortController().signal,
+  }
+}
+
+async function executeJsonTool(
+  tools: ReturnType<typeof createAgentTeamsTools>,
+  toolName: keyof ReturnType<typeof createAgentTeamsTools>,
+  args: Record<string, unknown>,
+  context: TestToolContext,
+): Promise<unknown> {
+  const output = await tools[toolName].execute(args, context)
+  return JSON.parse(output)
+}
+
+describe("agent-teams team lifecycle tools", () => {
+  let originalCwd: string
+  let tempProjectDir: string
+
+  beforeEach(() => {
+    originalCwd = process.cwd()
+    tempProjectDir = mkdtempSync(join(tmpdir(), "agent-teams-lifecycle-"))
+    process.chdir(tempProjectDir)
+  })
+
+  afterEach(() => {
+    process.chdir(originalCwd)
+    rmSync(tempProjectDir, { recursive: true, force: true })
+  })
+
+  test("team_delete requires lead session authorization", async () => {
+    //#given
+    const tools = createAgentTeamsTools({} as BackgroundManager)
+    const leadContext = createContext("ses-main")
+    await executeJsonTool(tools, "team_create", { team_name: "core" }, leadContext)
+
+    //#when
+    const unauthorized = await executeJsonTool(
+      tools,
+      "team_delete",
+      { team_name: "core" },
+      createContext("ses-intruder"),
+    ) as { error?: string }
+
+    //#then
+    expect(unauthorized.error).toBe("unauthorized_lead_session")
+    expect(existsSync(getTeamDir("core"))).toBe(true)
+  })
+})
diff --git a/src/tools/agent-teams/team-lifecycle-tools.ts b/src/tools/agent-teams/team-lifecycle-tools.ts
index bd252d03..4fb53b2f 100644
--- a/src/tools/agent-teams/team-lifecycle-tools.ts
+++ b/src/tools/agent-teams/team-lifecycle-tools.ts
@@ -52,10 +52,13 @@ export function createTeamDeleteTool(): ToolDefinition {
     args: {
       team_name: tool.schema.string().describe("Team name"),
     },
-    execute: async (args: Record<string, unknown>): Promise<string> => {
+    execute: async (args: Record<string, unknown>, context: TeamToolContext): Promise<string> => {
       try {
         const input = TeamDeleteInputSchema.parse(args)
         const config = readTeamConfigOrThrow(input.team_name)
+        if (context.sessionID !== config.leadSessionId) {
+          return JSON.stringify({ error: "unauthorized_lead_session" })
+        }
         const teammates = listTeammates(config)
         if (teammates.length > 0) {
           return JSON.stringify({