diff --git a/bin/multiagent-safety.js b/bin/multiagent-safety.js
index d66db9b..419b8c2 100755
--- a/bin/multiagent-safety.js
+++ b/bin/multiagent-safety.js
@@ -3967,37 +3967,60 @@ function agents(rawArgs) {
       return;
     }
 
-    if (reviewRunning) {
-      stopAgentProcessByPid(existingReviewPid, 'review-bot-watch.sh');
-    }
-    if (cleanupRunning) {
-      stopAgentProcessByPid(existingCleanupPid, `${path.basename(__filename)} cleanup`);
-    }
-
     const reviewLogPath = path.join(repoRoot, '.omx', 'logs', 'agent-review.log');
     const cleanupLogPath = path.join(repoRoot, '.omx', 'logs', 'agent-cleanup.log');
-    const reviewPid = spawnDetachedAgentProcess({
-      command: 'bash',
-      args: [reviewScriptPath, '--interval', String(options.reviewIntervalSeconds)],
-      cwd: repoRoot,
-      logPath: reviewLogPath,
-    });
-    const cleanupPid = spawnDetachedAgentProcess({
-      command: process.execPath,
-      args: [
-        path.resolve(__filename),
-        'cleanup',
-        '--target',
-        repoRoot,
-        '--watch',
-        '--interval',
-        String(options.cleanupIntervalSeconds),
-        '--idle-minutes',
-        String(options.idleMinutes),
-      ],
-      cwd: repoRoot,
-      logPath: cleanupLogPath,
-    });
+
+    let reviewPid = existingReviewPid;
+    let cleanupPid = existingCleanupPid;
+    let startedAny = false;
+    let reusedAny = false;
+
+    if (!reviewRunning) {
+      reviewPid = spawnDetachedAgentProcess({
+        command: 'bash',
+        args: [reviewScriptPath, '--interval', String(options.reviewIntervalSeconds)],
+        cwd: repoRoot,
+        logPath: reviewLogPath,
+      });
+      startedAny = true;
+    } else {
+      reusedAny = true;
+    }
+
+    if (!cleanupRunning) {
+      cleanupPid = spawnDetachedAgentProcess({
+        command: process.execPath,
+        args: [
+          path.resolve(__filename),
+          'cleanup',
+          '--target',
+          repoRoot,
+          '--watch',
+          '--interval',
+          String(options.cleanupIntervalSeconds),
+          '--idle-minutes',
+          String(options.idleMinutes),
+        ],
+        cwd: repoRoot,
+        logPath: cleanupLogPath,
+      });
+      startedAny = true;
+    } else {
+      reusedAny = true;
+    }
+
+    const priorReviewInterval = Number.parseInt(String(existingState?.review?.intervalSeconds || ''), 10);
+    const priorCleanupInterval = Number.parseInt(String(existingState?.cleanup?.intervalSeconds || ''), 10);
+    const priorIdleMinutes = Number.parseInt(String(existingState?.cleanup?.idleMinutes || ''), 10);
+    const reviewIntervalSeconds = reviewRunning && Number.isInteger(priorReviewInterval) && priorReviewInterval >= 5
+      ? priorReviewInterval
+      : options.reviewIntervalSeconds;
+    const cleanupIntervalSeconds = cleanupRunning && Number.isInteger(priorCleanupInterval) && priorCleanupInterval >= 5
+      ? priorCleanupInterval
+      : options.cleanupIntervalSeconds;
+    const idleMinutes = cleanupRunning && Number.isInteger(priorIdleMinutes) && priorIdleMinutes >= 1
+      ? priorIdleMinutes
+      : options.idleMinutes;
 
     writeAgentsState(repoRoot, {
       schemaVersion: 1,
@@ -4005,14 +4028,14 @@ function agents(rawArgs) {
       startedAt: new Date().toISOString(),
       review: {
         pid: reviewPid,
-        intervalSeconds: options.reviewIntervalSeconds,
+        intervalSeconds: reviewIntervalSeconds,
         script: reviewScriptPath,
         logPath: reviewLogPath,
       },
       cleanup: {
         pid: cleanupPid,
-        intervalSeconds: options.cleanupIntervalSeconds,
-        idleMinutes: options.idleMinutes,
+        intervalSeconds: cleanupIntervalSeconds,
+        idleMinutes,
         script: path.resolve(__filename),
         logPath: cleanupLogPath,
       },
@@ -4021,6 +4044,9 @@ function agents(rawArgs) {
     console.log(
       `[${TOOL_NAME}] Started repo agents in ${repoRoot} (review pid=${reviewPid}, cleanup pid=${cleanupPid}).`,
     );
+    if (reusedAny && startedAny) {
+      console.log(`[${TOOL_NAME}] Reused healthy bot process(es) and started only missing ones.`);
+    }
     console.log(`[${TOOL_NAME}] Logs: ${reviewLogPath}, ${cleanupLogPath}`);
     process.exitCode = 0;
     return;
diff --git a/test/install.test.js b/test/install.test.js
index fdfd880..fb3b342 100644
--- a/test/install.test.js
+++ b/test/install.test.js
@@ -1386,6 +1386,68 @@ 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 start reuses running review bot when only cleanup bot is missing', () => {
+  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, '--review-interval', '31', '--cleanup-interval', '47', '--idle-minutes', '12'],
+    repoDir,
+  );
+  assert.equal(result.status, 0, result.stderr || result.stdout);
+
+  const statePath = path.join(repoDir, '.omx', 'state', 'agents-bots.json');
+  const firstState = JSON.parse(fs.readFileSync(statePath, 'utf8'));
+  const firstReviewPid = firstState.review.pid;
+  const firstCleanupPid = firstState.cleanup.pid;
+  assert.equal(isPidAlive(firstReviewPid), true, 'review bot should be alive after initial start');
+  assert.equal(isPidAlive(firstCleanupPid), true, 'cleanup bot should be alive after initial start');
+
+  process.kill(firstCleanupPid, 'SIGTERM');
+  assert.equal(waitForPidExit(firstCleanupPid), true, 'cleanup bot should stop during simulation');
+  assert.equal(isPidAlive(firstReviewPid), true, 'review bot should remain alive before restart');
+
+  result = runNode(
+    ['agents', 'start', '--target', repoDir, '--review-interval', '30', '--cleanup-interval', '60', '--idle-minutes', '60'],
+    repoDir,
+  );
+  assert.equal(result.status, 0, result.stderr || result.stdout);
+  assert.match(result.stdout, /Reused healthy bot process\(es\) and started only missing ones\./);
+
+  const secondState = JSON.parse(fs.readFileSync(statePath, 'utf8'));
+  assert.equal(secondState.review.pid, firstReviewPid, 'running review bot should be reused');
+  assert.notEqual(secondState.cleanup.pid, firstCleanupPid, 'missing cleanup bot should be restarted');
+  assert.equal(isPidAlive(secondState.review.pid), true, 'reused review bot should stay alive');
+  assert.equal(isPidAlive(secondState.cleanup.pid), true, 'new cleanup bot should be alive');
+
+  result = runNode(['agents', 'stop', '--target', repoDir], repoDir);
+  assert.equal(result.status, 0, result.stderr || result.stdout);
+  assert.equal(waitForPidExit(secondState.review.pid), true, 'review bot pid should exit after stop');
+  assert.equal(waitForPidExit(secondState.cleanup.pid), true, 'cleanup bot pid should exit after stop');
+});
+
 test('agents cleanup bot defaults to a 60-minute idle threshold', () => {
   const repoDir = initRepo();
   seedCommit(repoDir);