diff --git a/bin/multiagent-safety.js b/bin/multiagent-safety.js
index fe23c28..ce99aa3 100755
--- a/bin/multiagent-safety.js
+++ b/bin/multiagent-safety.js
@@ -35,6 +35,7 @@ const GIT_SYNC_STRATEGY_KEY = 'multiagent.sync.strategy';
 const DEFAULT_PROTECTED_BRANCHES = ['dev', 'main', 'master'];
 const DEFAULT_BASE_BRANCH = 'dev';
 const DEFAULT_SYNC_STRATEGY = 'rebase';
+const DEFAULT_SHADOW_CLEANUP_IDLE_MINUTES = 60;
 
 const TEMPLATE_ROOT = path.resolve(__dirname, '..', 'templates');
 
@@ -185,7 +186,7 @@ const CLI_COMMAND_DESCRIPTIONS = [
   ['copy-commands', 'Print setup checklist as executable commands only'],
   ['protect', 'Manage protected branches (list/add/remove/set/reset)'],
   ['sync', 'Check or sync agent branches with origin/<base>'],
-  ['cleanup', 'Cleanup agent branches/worktrees (supports idle watch mode)'],
+  ['cleanup', 'Cleanup agent branches/worktrees (watch mode defaults to 60-minute idle threshold)'],
   ['agents', 'Start/stop repo-scoped review + cleanup bots'],
   ['install', 'Install templates/locks/hooks without running full setup (supports --no-gitignore)'],
   ['fix', 'Repair broken or missing guardrail files/config (supports --no-gitignore)'],
@@ -1645,7 +1646,7 @@ function parseAgentsArgs(rawArgs) {
     subcommand,
     reviewIntervalSeconds: 30,
     cleanupIntervalSeconds: 60,
-    idleMinutes: 10,
+    idleMinutes: DEFAULT_SHADOW_CLEANUP_IDLE_MINUTES,
   };
 
   for (let index = 0; index < rest.length; index += 1) {
@@ -2498,7 +2499,7 @@ function parseCleanupArgs(rawArgs) {
   }
 
   if (options.watch && options.idleMinutes === 0) {
-    options.idleMinutes = 10;
+    options.idleMinutes = DEFAULT_SHADOW_CLEANUP_IDLE_MINUTES;
   }
 
   return options;
@@ -3979,6 +3980,7 @@ function agents(rawArgs) {
         String(options.cleanupIntervalSeconds),
         '--idle-minutes',
         String(options.idleMinutes),
+        '--include-pr-merged',
       ],
       cwd: repoRoot,
       logPath: cleanupLogPath,
@@ -3998,6 +4000,7 @@ function agents(rawArgs) {
         pid: cleanupPid,
         intervalSeconds: options.cleanupIntervalSeconds,
         idleMinutes: options.idleMinutes,
+        includePrMerged: true,
         script: path.resolve(__filename),
         logPath: cleanupLogPath,
       },
diff --git a/test/install.test.js b/test/install.test.js
index 806e99e..4ccd63f 100644
--- a/test/install.test.js
+++ b/test/install.test.js
@@ -1386,6 +1386,48 @@ test('agents command starts review+cleanup bots for the target repo and stops th
   assert.equal(fs.existsSync(statePath), false, 'agents stop should remove state file');
 });
 
+test('agents cleanup bot defaults to a 60-minute idle threshold', () => {
+  const repoDir = initRepo();
+  seedCommit(repoDir);
+  const scriptsDir = path.join(repoDir, 'scripts');
+  fs.mkdirSync(scriptsDir, { recursive: true });
+
+  const reviewScriptPath = path.join(scriptsDir, 'review-bot-watch.sh');
+  fs.writeFileSync(
+    reviewScriptPath,
+    '#!/usr/bin/env bash\n' +
+      'set -euo pipefail\n' +
+      'while true; do sleep 60; done\n',
+    'utf8',
+  );
+  fs.chmodSync(reviewScriptPath, 0o755);
+
+  const pruneScriptPath = path.join(scriptsDir, 'agent-worktree-prune.sh');
+  fs.writeFileSync(
+    pruneScriptPath,
+    '#!/usr/bin/env bash\n' +
+      'set -euo pipefail\n' +
+      'exit 0\n',
+    'utf8',
+  );
+  fs.chmodSync(pruneScriptPath, 0o755);
+
+  let result = runNode(['agents', 'start', '--target', repoDir], repoDir);
+  assert.equal(result.status, 0, result.stderr || result.stdout);
+
+  const statePath = path.join(repoDir, '.omx', 'state', 'agents-bots.json');
+  const state = JSON.parse(fs.readFileSync(statePath, 'utf8'));
+  assert.equal(state.cleanup.idleMinutes, 60);
+  assert.equal(state.cleanup.includePrMerged, true);
+  assert.equal(isPidAlive(state.review.pid), true, 'review bot pid should be alive after start');
+  assert.equal(isPidAlive(state.cleanup.pid), true, 'cleanup bot pid should be alive after start');
+
+  result = runNode(['agents', 'stop', '--target', repoDir], repoDir);
+  assert.equal(result.status, 0, result.stderr || result.stdout);
+  assert.equal(waitForPidExit(state.review.pid), true, 'review bot pid should exit after stop');
+  assert.equal(waitForPidExit(state.cleanup.pid), true, 'cleanup bot pid should exit after stop');
+});
+
 test('finish command auto-commits dirty agent worktree and runs PR finish flow for the branch', () => {
   const repoDir = initRepoOnBranch('main');
   seedCommit(repoDir);
@@ -3380,7 +3422,7 @@ test('cleanup command can remove squash-merged agent branches via merged PR dete
   assert.equal(fs.existsSync(worktreePath), false, 'cleanup should remove merged PR worktree');
 });
 
-test('cleanup command watch mode defaults to 10-minute idle threshold and supports one-cycle execution', () => {
+test('cleanup command watch mode defaults to 60-minute idle threshold and supports one-cycle execution', () => {
   const repoDir = initRepo();
   const scriptsDir = path.join(repoDir, 'scripts');
   fs.mkdirSync(scriptsDir, { recursive: true });
@@ -3399,7 +3441,7 @@ test('cleanup command watch mode defaults to 10-minute idle threshold and suppor
   const result = runNode(['cleanup', '--target', repoDir, '--watch', '--once', '--interval', '15'], repoDir);
   assert.equal(result.status, 0, result.stderr || result.stdout);
   const passedArgs = fs.readFileSync(markerArgs, 'utf8').trim();
-  assert.match(passedArgs, /--idle-minutes 10/);
+  assert.match(passedArgs, /--idle-minutes 60/);
   assert.match(passedArgs, /--only-dirty-worktrees/);
 });