diff --git a/backend/agenteval/intelligent_eval/cron_pool.py b/backend/agenteval/intelligent_eval/cron_pool.py
new file mode 100644
index 0000000..c58948f
--- /dev/null
+++ b/backend/agenteval/intelligent_eval/cron_pool.py
@@ -0,0 +1,311 @@
+"""Cron pool management for intelligent evaluations (Cron 池管理).
+
+Platform manages a pool of OpenClaw crons (5-20) that can process any
+intelligent evaluation. Pool automatically scales up/down based on load.
+"""
+
+import logging
+from datetime import datetime, timedelta
+from typing import Optional
+
+from sqlmodel import Session, select
+
+from agenteval.intelligent_eval.openclaw_client import OpenClawClient
+from agenteval.storage.db import OpenClawCronPoolDB, utc_now
+
+_logger = logging.getLogger("agenteval")
+
+# Pool configuration
+MIN_POOL_SIZE = 5
+MAX_POOL_SIZE = 20
+SCALE_UP_THRESHOLD = 0.8  # busy/total > 0.8 triggers scale up
+SCALE_DOWN_THRESHOLD = 2  # idle > min_size * 2 triggers scale down
+STUCK_THRESHOLD_MINUTES = 10
+
+
+async def initialize_pool(session: Session, client: OpenClawClient) -> int:
+    """Initialize cron pool on startup.
+
+    Creates MIN_POOL_SIZE crons if pool is empty.
+
+    Returns:
+        Number of crons created
+    """
+    # Check if pool already initialized
+    existing = session.exec(select(OpenClawCronPoolDB)).all()
+    if existing:
+        _logger.info(f"Cron pool already initialized with {len(existing)} crons")
+        return 0
+
+    # Create MIN_POOL_SIZE crons
+    created = 0
+    for i in range(MIN_POOL_SIZE):
+        try:
+            cron_id = await client.create_cron(
+                name=f"intelligent-eval-worker-{i}",
+                schedule="* * * * *",  # Every minute
+                skill="agenteval-intelligent-worker",
+                state={"status": "idle"},
+            )
+
+            # Record in DB
+            cron_db = OpenClawCronPoolDB(
+                openclaw_cron_id=cron_id,
+                status="idle",
+                last_active_at=utc_now(),
+            )
+            session.add(cron_db)
+            created += 1
+        except Exception as exc:
+            _logger.error(f"Failed to create cron {i}: {exc}")
+
+    session.commit()
+    _logger.info(f"Initialized cron pool with {created} crons")
+    return created
+
+
+async def scale_up(count: int, session: Session, client: OpenClawClient) -> int:
+    """Scale up the pool by creating new crons.
+
+    Args:
+        count: Number of crons to create
+        session: Database session
+        client: OpenClaw client
+
+    Returns:
+        Number of crons created
+    """
+    # Check current pool size
+    current_size = len(session.exec(select(OpenClawCronPoolDB)).all())
+    if current_size >= MAX_POOL_SIZE:
+        _logger.warning(f"Pool already at max size ({MAX_POOL_SIZE})")
+        return 0
+
+    # Limit count to not exceed max size
+    count = min(count, MAX_POOL_SIZE - current_size)
+
+    created = 0
+    for i in range(count):
+        try:
+            cron_id = await client.create_cron(
+                name=f"intelligent-eval-worker-{current_size + i}",
+                schedule="* * * * *",
+                skill="agenteval-intelligent-worker",
+                state={"status": "idle"},
+            )
+
+            cron_db = OpenClawCronPoolDB(
+                openclaw_cron_id=cron_id,
+                status="idle",
+                last_active_at=utc_now(),
+            )
+            session.add(cron_db)
+            created += 1
+        except Exception as exc:
+            _logger.error(f"Failed to create cron during scale up: {exc}")
+
+    session.commit()
+    _logger.info(f"Scaled up pool by {created} crons (total: {current_size + created})")
+    return created
+
+
+async def scale_down(count: int, session: Session, client: OpenClawClient) -> int:
+    """Scale down the pool by deleting idle crons.
+
+    Args:
+        count: Number of crons to delete
+        session: Database session
+        client: OpenClaw client
+
+    Returns:
+        Number of crons deleted
+    """
+    # Check current pool size
+    current_size = len(session.exec(select(OpenClawCronPoolDB)).all())
+    if current_size <= MIN_POOL_SIZE:
+        _logger.warning(f"Pool already at min size ({MIN_POOL_SIZE})")
+        return 0
+
+    # Limit count to not go below min size
+    count = min(count, current_size - MIN_POOL_SIZE)
+
+    # Find idle crons to delete
+    idle_crons = session.exec(
+        select(OpenClawCronPoolDB)
+        .where(OpenClawCronPoolDB.status == "idle")
+        .order_by(OpenClawCronPoolDB.last_active_at)
+        .limit(count)
+    ).all()
+
+    deleted = 0
+    for cron in idle_crons:
+        try:
+            await client.delete_cron(cron.openclaw_cron_id)
+            session.delete(cron)
+            deleted += 1
+        except Exception as exc:
+            _logger.error(f"Failed to delete cron {cron.openclaw_cron_id}: {exc}")
+
+    session.commit()
+    _logger.info(f"Scaled down pool by {deleted} crons (total: {current_size - deleted})")
+    return deleted
+
+
+async def auto_scale(session: Session, client: OpenClawClient) -> tuple[int, int]:
+    """Automatically scale pool based on load.
+
+    Returns:
+        (scaled_up, scaled_down) counts
+    """
+    crons = session.exec(select(OpenClawCronPoolDB)).all()
+    total = len(crons)
+
+    if total == 0:
+        # Pool not initialized
+        return (0, 0)
+
+    busy = sum(1 for c in crons if c.status == "busy")
+    idle = sum(1 for c in crons if c.status == "idle")
+
+    scaled_up = 0
+    scaled_down = 0
+
+    # Scale up if busy/total > threshold and not at max
+    if busy / total > SCALE_UP_THRESHOLD and total < MAX_POOL_SIZE:
+        scaled_up = await scale_up(1, session, client)
+
+    # Scale down if idle > min_size * threshold and not at min
+    elif idle > MIN_POOL_SIZE * SCALE_DOWN_THRESHOLD and total > MIN_POOL_SIZE:
+        scaled_down = await scale_down(1, session, client)
+
+    return (scaled_up, scaled_down)
+
+
+def get_pool_status(session: Session) -> dict:
+    """Get current pool status.
+
+    Returns:
+        Dict with pool stats
+    """
+    crons = session.exec(select(OpenClawCronPoolDB)).all()
+    total = len(crons)
+    idle = sum(1 for c in crons if c.status == "idle")
+    busy = sum(1 for c in crons if c.status == "busy")
+    stuck = sum(1 for c in crons if c.status == "stuck")
+
+    return {
+        "total": total,
+        "idle": idle,
+        "busy": busy,
+        "stuck": stuck,
+        "min_size": MIN_POOL_SIZE,
+        "max_size": MAX_POOL_SIZE,
+    }
+
+
+async def sync_cron_states(session: Session, client: OpenClawClient) -> int:
+    """Sync cron states from OpenClaw to platform DB.
+
+    Returns:
+        Number of crons synced
+    """
+    # Get all crons from OpenClaw
+    openclaw_crons = await client.list_crons()
+
+    synced = 0
+    for oc_cron in openclaw_crons:
+        # Find corresponding DB record
+        db_cron = session.exec(
+            select(OpenClawCronPoolDB).where(OpenClawCronPoolDB.openclaw_cron_id == oc_cron.id)
+        ).first()
+
+        if db_cron is None:
+            # New cron, add to DB
+            db_cron = OpenClawCronPoolDB(
+                openclaw_cron_id=oc_cron.id,
+                status="idle" if oc_cron.enabled else "disabled",
+                last_active_at=utc_now(),
+            )
+            session.add(db_cron)
+            synced += 1
+        else:
+            # Update existing record
+            if oc_cron.state:
+                new_status = oc_cron.state.get("status", "idle")
+                if db_cron.status != new_status:
+                    db_cron.status = new_status
+                    db_cron.updated_at = utc_now()
+                    synced += 1
+
+    session.commit()
+    return synced
+
+
+def detect_stuck_crons(session: Session) -> list[OpenClawCronPoolDB]:
+    """Detect stuck crons (busy but not active for > 10 minutes).
+
+    Returns:
+        List of stuck crons
+    """
+    threshold = utc_now() - timedelta(minutes=STUCK_THRESHOLD_MINUTES)
+    stuck = session.exec(
+        select(OpenClawCronPoolDB).where(
+            OpenClawCronPoolDB.status == "busy",
+            OpenClawCronPoolDB.last_active_at < threshold,
+        )
+    ).all()
+    return list(stuck)
+
+
+async def handle_stuck_cron(cron: OpenClawCronPoolDB, session: Session, client: OpenClawClient) -> None:
+    """Handle a stuck cron: mark as stuck, requeue task, delete cron, create new one.
+
+    Args:
+        cron: Stuck cron
+        session: Database session
+        client: OpenClaw client
+    """
+    from agenteval.intelligent_eval.task_queue import complete_task
+
+    _logger.warning(f"Handling stuck cron {cron.openclaw_cron_id}")
+
+    # Mark as stuck
+    cron.status = "stuck"
+    cron.updated_at = utc_now()
+
+    # Requeue task if any
+    if cron.current_eval_id:
+        from agenteval.storage.db import IntelligentEvalTaskQueueDB
+
+        task = session.exec(
+            select(IntelligentEvalTaskQueueDB).where(
+                IntelligentEvalTaskQueueDB.eval_id == cron.current_eval_id,
+                IntelligentEvalTaskQueueDB.status == "assigned",
+                IntelligentEvalTaskQueueDB.assigned_cron_id == cron.openclaw_cron_id,
+            )
+        ).first()
+
+        if task:
+            # Mark task as failed
+            complete_task(task.id, False, "Cron stuck", session)
+
+            # Create new task for retry
+            new_task = IntelligentEvalTaskQueueDB(
+                eval_id=cron.current_eval_id,
+                status="pending",
+                priority=1,  # High priority
+                reason="cron_stuck_retry",
+            )
+            session.add(new_task)
+
+    # Delete stuck cron
+    try:
+        await client.delete_cron(cron.openclaw_cron_id)
+        session.delete(cron)
+    except Exception as exc:
+        _logger.error(f"Failed to delete stuck cron {cron.openclaw_cron_id}: {exc}")
+
+    # Create new cron to replace
+    await scale_up(1, session, client)
+
+    session.commit()
diff --git a/backend/agenteval/intelligent_eval/openclaw_client.py b/backend/agenteval/intelligent_eval/openclaw_client.py
new file mode 100644
index 0000000..7cd1d23
--- /dev/null
+++ b/backend/agenteval/intelligent_eval/openclaw_client.py
@@ -0,0 +1,171 @@
+"""OpenClaw CLI client for managing cron jobs.
+
+Wraps `openclaw automations` commands to create, delete, and list cron jobs.
+"""
+
+import asyncio
+import json
+import logging
+from dataclasses import dataclass
+from typing import Optional
+
+_logger = logging.getLogger("agenteval")
+
+
+@dataclass
+class OpenClawCron:
+    """OpenClaw cron job info."""
+
+    id: str
+    name: str
+    schedule: str
+    enabled: bool
+    state: Optional[dict] = None
+
+
+class OpenClawClient:
+    """Client for OpenClaw CLI commands."""
+
+    def __init__(self, openclaw_bin: str = "openclaw"):
+        self.openclaw_bin = openclaw_bin
+
+    async def _run_command(self, *args: str) -> tuple[int, str, str]:
+        """Run an OpenClaw CLI command.
+
+        Returns:
+            (returncode, stdout, stderr)
+        """
+        cmd = [self.openclaw_bin] + list(args)
+        _logger.debug(f"Running OpenClaw command: {' '.join(cmd)}")
+
+        process = await asyncio.create_subprocess_exec(
+            *cmd,
+            stdout=asyncio.subprocess.PIPE,
+            stderr=asyncio.subprocess.PIPE,
+        )
+        stdout, stderr = await process.communicate()
+
+        return (
+            process.returncode or 0,
+            stdout.decode("utf-8"),
+            stderr.decode("utf-8"),
+        )
+
+    async def create_cron(
+        self,
+        *,
+        name: str,
+        schedule: str,
+        skill: str,
+        state: Optional[dict] = None,
+    ) -> str:
+        """Create a cron job.
+
+        Args:
+            name: Cron job name
+            schedule: Cron schedule expression (e.g., "* * * * *")
+            skill: Skill to execute
+            state: Initial state (JSON)
+
+        Returns:
+            Cron job ID
+
+        Raises:
+            RuntimeError: If creation fails
+        """
+        args = [
+            "automations",
+            "create",
+            schedule,
+            f"--name={name}",
+            f"--skill={skill}",
+        ]
+
+        if state:
+            args.append(f"--state={json.dumps(state)}")
+
+        returncode, stdout, stderr = await self._run_command(*args)
+
+        if returncode != 0:
+            raise RuntimeError(f"Failed to create cron: {stderr}")
+
+        # Parse cron ID from output
+        # Expected output format: "Created automation <id>"
+        lines = stdout.strip().split("\n")
+        for line in lines:
+            if "Created automation" in line:
+                cron_id = line.split()[-1]
+                _logger.info(f"Created OpenClaw cron {cron_id}: {name}")
+                return cron_id
+
+        raise RuntimeError(f"Failed to parse cron ID from output: {stdout}")
+
+    async def delete_cron(self, cron_id: str) -> None:
+        """Delete a cron job.
+
+        Args:
+            cron_id: Cron job ID
+
+        Raises:
+            RuntimeError: If deletion fails
+        """
+        returncode, stdout, stderr = await self._run_command(
+            "automations",
+            "remove",
+            cron_id,
+        )
+
+        if returncode != 0:
+            raise RuntimeError(f"Failed to delete cron {cron_id}: {stderr}")
+
+        _logger.info(f"Deleted OpenClaw cron {cron_id}")
+
+    async def list_crons(self) -> list[OpenClawCron]:
+        """List all cron jobs.
+
+        Returns:
+            List of cron jobs
+
+        Raises:
+            RuntimeError: If listing fails
+        """
+        returncode, stdout, stderr = await self._run_command(
+            "automations",
+            "list",
+            "--json",
+        )
+
+        if returncode != 0:
+            raise RuntimeError(f"Failed to list crons: {stderr}")
+
+        try:
+            data = json.loads(stdout)
+            crons = []
+            for item in data:
+                crons.append(
+                    OpenClawCron(
+                        id=item["id"],
+                        name=item.get("name", ""),
+                        schedule=item.get("schedule", ""),
+                        enabled=item.get("enabled", True),
+                        state=item.get("state"),
+                    )
+                )
+            return crons
+        except (json.JSONDecodeError, KeyError) as e:
+            raise RuntimeError(f"Failed to parse cron list: {e}") from e
+
+    async def get_cron_state(self, cron_id: str) -> Optional[dict]:
+        """Get cron job state.
+
+        Args:
+            cron_id: Cron job ID
+
+        Returns:
+            State dict, or None if not found
+        """
+        crons = await self.list_crons()
+        for cron in crons:
+            if cron.id == cron_id:
+                return cron.state
+        return None
diff --git a/backend/agenteval/web/app.py b/backend/agenteval/web/app.py
index 8fc2116..5db0690 100644
--- a/backend/agenteval/web/app.py
+++ b/backend/agenteval/web/app.py
@@ -19,6 +19,7 @@ from agenteval.web.routers import (
     files,
     intelligent_evals,
     model_configs,
+    openclaw_cron_pool,
     proxy,
     reports,
     runs,
@@ -109,6 +110,9 @@ app.include_router(exploration.router, prefix="/api/exploration", tags=["explora
 app.include_router(
     intelligent_evals.router, prefix="/api/intelligent-evals", tags=["intelligent-evals"], dependencies=_api_deps
 )
+app.include_router(
+    openclaw_cron_pool.router, prefix="/api/openclaw", tags=["openclaw-cron-pool"], dependencies=_api_deps
+)
 app.include_router(reports.router, prefix="/api/reports", tags=["reports"], dependencies=_api_deps)
 app.include_router(stats.router, prefix="/api/stats", tags=["stats"], dependencies=_api_deps)
 app.include_router(files.router, prefix="/api/files", tags=["files"], dependencies=_api_deps)
diff --git a/backend/agenteval/web/routers/openclaw_cron_pool.py b/backend/agenteval/web/routers/openclaw_cron_pool.py
new file mode 100644
index 0000000..532bd07
--- /dev/null
+++ b/backend/agenteval/web/routers/openclaw_cron_pool.py
@@ -0,0 +1,65 @@
+"""API routes for OpenClaw cron pool management."""
+
+from fastapi import APIRouter, Depends, HTTPException
+from pydantic import BaseModel, Field
+from sqlmodel import Session
+
+from agenteval.intelligent_eval import cron_pool
+from agenteval.intelligent_eval.openclaw_client import OpenClawClient
+from agenteval.web.deps import get_db
+
+router = APIRouter()
+
+
+class ScaleRequest(BaseModel):
+    target_size: int = Field(ge=1, le=50)
+
+
+@router.get("/cron-pool")
+async def get_cron_pool_status(session: Session = Depends(get_db)) -> dict:
+    """Get cron pool status."""
+    status = cron_pool.get_pool_status(session)
+    return {"pool": status}
+
+
+@router.post("/cron-pool/scale")
+async def scale_cron_pool(request: ScaleRequest, session: Session = Depends(get_db)) -> dict:
+    """Manually scale cron pool to target size."""
+    current_status = cron_pool.get_pool_status(session)
+    current_size = current_status["total"]
+    target_size = request.target_size
+
+    client = OpenClawClient()
+
+    if target_size > current_size:
+        # Scale up
+        count = target_size - current_size
+        created = await cron_pool.scale_up(count, session, client)
+        return {"success": True, "scaled_up": created, "current_size": current_size + created}
+    elif target_size < current_size:
+        # Scale down
+        count = current_size - target_size
+        deleted = await cron_pool.scale_down(count, session, client)
+        return {"success": True, "scaled_down": deleted, "current_size": current_size - deleted}
+    else:
+        return {"success": True, "current_size": current_size, "message": "already at target size"}
+
+
+@router.post("/cron-pool/sync")
+async def sync_cron_states(session: Session = Depends(get_db)) -> dict:
+    """Sync cron states from OpenClaw to platform DB."""
+    client = OpenClawClient()
+    synced = await cron_pool.sync_cron_states(session, client)
+    return {"success": True, "synced": synced}
+
+
+@router.post("/cron-pool/auto-scale")
+async def auto_scale_pool(session: Session = Depends(get_db)) -> dict:
+    """Trigger auto-scaling based on current load."""
+    client = OpenClawClient()
+    scaled_up, scaled_down = await cron_pool.auto_scale(session, client)
+    return {
+        "success": True,
+        "scaled_up": scaled_up,
+        "scaled_down": scaled_down,
+    }
diff --git a/tests/integration/test_cron_pool_api.py b/tests/integration/test_cron_pool_api.py
new file mode 100644
index 0000000..047422d
--- /dev/null
+++ b/tests/integration/test_cron_pool_api.py
@@ -0,0 +1,185 @@
+"""Integration tests for cron pool API."""
+
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import pytest
+from fastapi.testclient import TestClient
+from sqlmodel import Session, SQLModel, create_engine
+
+from agenteval.intelligent_eval.openclaw_client import OpenClawClient
+from agenteval.storage.db import OpenClawCronPoolDB, utc_now
+from agenteval.web.app import app
+from agenteval.web.deps import get_db
+
+
+@pytest.fixture()
+def client(tmp_path):
+    """Create a TestClient with a fresh database."""
+    from agenteval.storage.db import OpenClawCronPoolDB  # noqa: F401
+
+    engine = create_engine(
+        f"sqlite:///{tmp_path / 'test.db'}",
+        connect_args={"check_same_thread": False},
+    )
+    SQLModel.metadata.create_all(engine)
+    session = Session(engine)
+
+    def override_get_db():
+        try:
+            yield session
+        finally:
+            pass
+
+    app.dependency_overrides[get_db] = override_get_db
+    client = TestClient(app)
+    yield client
+    app.dependency_overrides.clear()
+    session.close()
+    engine.dispose()
+
+
+@pytest.fixture()
+def db_session(client):
+    """Get the database session from the client fixture."""
+    return next(app.dependency_overrides[get_db]())
+
+
+@pytest.fixture()
+def mock_openclaw_client():
+    """Mock OpenClaw client."""
+    client = MagicMock(spec=OpenClawClient)
+    
+    counter = {"value": 0}
+    
+    async def create_cron_impl(**kwargs):
+        counter["value"] += 1
+        return f"cron-{counter['value']}"
+    
+    client.create_cron = AsyncMock(side_effect=create_cron_impl)
+    client.delete_cron = AsyncMock()
+    client.list_crons = AsyncMock(return_value=[])
+    return client
+
+
+def test_get_cron_pool_status_empty(client: TestClient):
+    """Test getting pool status when pool is empty."""
+    response = client.get("/api/openclaw/cron-pool")
+    assert response.status_code == 200
+
+    data = response.json()
+    assert data["pool"]["total"] == 0
+    assert data["pool"]["idle"] == 0
+    assert data["pool"]["busy"] == 0
+    assert data["pool"]["stuck"] == 0
+    assert data["pool"]["min_size"] == 5
+    assert data["pool"]["max_size"] == 20
+
+
+def test_get_cron_pool_status_with_crons(client: TestClient, db_session: Session):
+    """Test getting pool status with existing crons."""
+    # Create crons
+    for i in range(10):
+        status = ["idle", "busy", "stuck"][i % 3]
+        cron = OpenClawCronPoolDB(
+            openclaw_cron_id=f"cron-{i}",
+            status=status,
+            last_active_at=utc_now(),
+        )
+        db_session.add(cron)
+    db_session.commit()
+
+    response = client.get("/api/openclaw/cron-pool")
+    assert response.status_code == 200
+
+    data = response.json()
+    assert data["pool"]["total"] == 10
+    assert data["pool"]["idle"] == 4
+    assert data["pool"]["busy"] == 3
+    assert data["pool"]["stuck"] == 3
+
+
+@patch("agenteval.web.routers.openclaw_cron_pool.OpenClawClient")
+def test_scale_up_pool(mock_client_class, client: TestClient, db_session: Session, mock_openclaw_client):
+    """Test manually scaling up the pool."""
+    mock_client_class.return_value = mock_openclaw_client
+
+    # Create 5 crons
+    for i in range(5):
+        cron = OpenClawCronPoolDB(
+            openclaw_cron_id=f"existing-cron-{i}",
+            status="idle",
+            last_active_at=utc_now(),
+        )
+        db_session.add(cron)
+    db_session.commit()
+
+    # Scale up to 10
+    response = client.post("/api/openclaw/cron-pool/scale", json={"target_size": 10})
+    assert response.status_code == 200
+
+    data = response.json()
+    assert data["success"] is True
+    assert data["scaled_up"] == 5
+    assert data["current_size"] == 10
+
+    # Verify crons created
+    from sqlmodel import select
+
+    crons = db_session.exec(select(OpenClawCronPoolDB)).all()
+    assert len(crons) == 10
+
+
+@patch("agenteval.web.routers.openclaw_cron_pool.OpenClawClient")
+def test_scale_down_pool(mock_client_class, client: TestClient, db_session: Session, mock_openclaw_client):
+    """Test manually scaling down the pool."""
+    mock_client_class.return_value = mock_openclaw_client
+
+    # Create 15 idle crons
+    for i in range(15):
+        cron = OpenClawCronPoolDB(
+            openclaw_cron_id=f"cron-{i}",
+            status="idle",
+            last_active_at=utc_now(),
+        )
+        db_session.add(cron)
+    db_session.commit()
+
+    # Scale down to 8
+    response = client.post("/api/openclaw/cron-pool/scale", json={"target_size": 8})
+    assert response.status_code == 200
+
+    data = response.json()
+    assert data["success"] is True
+    assert data["scaled_down"] == 7
+    assert data["current_size"] == 8
+
+    # Verify crons deleted
+    from sqlmodel import select
+
+    crons = db_session.exec(select(OpenClawCronPoolDB)).all()
+    assert len(crons) == 8
+
+
+@patch("agenteval.web.routers.openclaw_cron_pool.OpenClawClient")
+def test_scale_pool_no_change(mock_client_class, client: TestClient, db_session: Session):
+    """Test scaling pool to same size (no change)."""
+    mock_client_class.return_value = MagicMock()
+
+    # Create 10 crons
+    for i in range(10):
+        cron = OpenClawCronPoolDB(
+            openclaw_cron_id=f"cron-{i}",
+            status="idle",
+            last_active_at=utc_now(),
+        )
+        db_session.add(cron)
+    db_session.commit()
+
+    # Scale to same size
+    response = client.post("/api/openclaw/cron-pool/scale", json={"target_size": 10})
+    assert response.status_code == 200
+
+    data = response.json()
+    assert data["success"] is True
+    assert data["current_size"] == 10
+    assert "already at target size" in data["message"]
diff --git a/tests/unit/test_cron_pool.py b/tests/unit/test_cron_pool.py
new file mode 100644
index 0000000..628ec7c
--- /dev/null
+++ b/tests/unit/test_cron_pool.py
@@ -0,0 +1,295 @@
+"""Unit tests for cron pool management."""
+
+from datetime import timedelta
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+from sqlmodel import Session, select
+
+from agenteval.intelligent_eval import cron_pool
+from agenteval.intelligent_eval.openclaw_client import OpenClawClient, OpenClawCron
+from agenteval.storage.db import OpenClawCronPoolDB, utc_now
+
+
+@pytest.fixture()
+def mock_openclaw_client():
+    """Mock OpenClaw client."""
+    client = MagicMock(spec=OpenClawClient)
+    
+    # Make create_cron return unique IDs
+    counter = {"value": 0}
+    
+    async def create_cron_impl(**kwargs):
+        counter["value"] += 1
+        return f"cron-{counter['value']}"
+    
+    client.create_cron = AsyncMock(side_effect=create_cron_impl)
+    client.delete_cron = AsyncMock()
+    client.list_crons = AsyncMock(return_value=[])
+    return client
+
+
+async def test_initialize_pool_empty(db_session: Session, mock_openclaw_client):
+    """Test pool initialization when pool is empty."""
+    created = await cron_pool.initialize_pool(db_session, mock_openclaw_client)
+    assert created == cron_pool.MIN_POOL_SIZE
+
+    # Verify crons created in DB
+    crons = db_session.exec(select(OpenClawCronPoolDB)).all()
+    assert len(crons) == cron_pool.MIN_POOL_SIZE
+    assert all(c.status == "idle" for c in crons)
+
+
+async def test_initialize_pool_already_exists(db_session: Session, mock_openclaw_client):
+    """Test pool initialization when pool already exists."""
+    # Create existing cron
+    existing = OpenClawCronPoolDB(
+        openclaw_cron_id="existing-cron",
+        status="idle",
+        last_active_at=utc_now(),
+    )
+    db_session.add(existing)
+    db_session.commit()
+
+    created = await cron_pool.initialize_pool(db_session, mock_openclaw_client)
+    assert created == 0
+
+    # Verify no new crons created
+    crons = db_session.exec(select(OpenClawCronPoolDB)).all()
+    assert len(crons) == 1
+
+
+async def test_scale_up(db_session: Session, mock_openclaw_client):
+    """Test scaling up the pool."""
+    created = await cron_pool.scale_up(3, db_session, mock_openclaw_client)
+    assert created == 3
+
+    crons = db_session.exec(select(OpenClawCronPoolDB)).all()
+    assert len(crons) == 3
+
+
+async def test_scale_up_max_limit(db_session: Session, mock_openclaw_client):
+    """Test scaling up respects max pool size."""
+    # Fill pool to max
+    for i in range(cron_pool.MAX_POOL_SIZE):
+        cron = OpenClawCronPoolDB(
+            openclaw_cron_id=f"cron-{i}",
+            status="idle",
+            last_active_at=utc_now(),
+        )
+        db_session.add(cron)
+    db_session.commit()
+
+    created = await cron_pool.scale_up(5, db_session, mock_openclaw_client)
+    assert created == 0
+
+
+async def test_scale_down(db_session: Session, mock_openclaw_client):
+    """Test scaling down the pool."""
+    # Create 10 idle crons
+    for i in range(10):
+        cron = OpenClawCronPoolDB(
+            openclaw_cron_id=f"cron-{i}",
+            status="idle",
+            last_active_at=utc_now(),
+        )
+        db_session.add(cron)
+    db_session.commit()
+
+    deleted = await cron_pool.scale_down(3, db_session, mock_openclaw_client)
+    assert deleted == 3
+
+    crons = db_session.exec(select(OpenClawCronPoolDB)).all()
+    assert len(crons) == 7
+
+
+async def test_scale_down_min_limit(db_session: Session, mock_openclaw_client):
+    """Test scaling down respects min pool size."""
+    # Create exactly MIN_POOL_SIZE crons
+    for i in range(cron_pool.MIN_POOL_SIZE):
+        cron = OpenClawCronPoolDB(
+            openclaw_cron_id=f"cron-{i}",
+            status="idle",
+            last_active_at=utc_now(),
+        )
+        db_session.add(cron)
+    db_session.commit()
+
+    deleted = await cron_pool.scale_down(3, db_session, mock_openclaw_client)
+    assert deleted == 0
+
+
+async def test_scale_down_only_idle(db_session: Session, mock_openclaw_client):
+    """Test scaling down only deletes idle crons."""
+    # Create 5 idle and 5 busy crons
+    for i in range(5):
+        idle_cron = OpenClawCronPoolDB(
+            openclaw_cron_id=f"idle-{i}",
+            status="idle",
+            last_active_at=utc_now(),
+        )
+        busy_cron = OpenClawCronPoolDB(
+            openclaw_cron_id=f"busy-{i}",
+            status="busy",
+            last_active_at=utc_now(),
+        )
+        db_session.add_all([idle_cron, busy_cron])
+    db_session.commit()
+
+    deleted = await cron_pool.scale_down(3, db_session, mock_openclaw_client)
+    assert deleted == 3
+
+    # Verify only idle crons deleted
+    remaining = db_session.exec(select(OpenClawCronPoolDB)).all()
+    assert len(remaining) == 7
+    assert sum(1 for c in remaining if c.status == "busy") == 5
+    assert sum(1 for c in remaining if c.status == "idle") == 2
+
+
+async def test_auto_scale_up(db_session: Session, mock_openclaw_client):
+    """Test auto-scaling up when busy/total > 0.8."""
+    # Create 10 crons, 9 busy (90% > 80%)
+    for i in range(10):
+        status = "busy" if i < 9 else "idle"
+        cron = OpenClawCronPoolDB(
+            openclaw_cron_id=f"existing-cron-{i}",
+            status=status,
+            last_active_at=utc_now(),
+        )
+        db_session.add(cron)
+    db_session.commit()
+
+    scaled_up, scaled_down = await cron_pool.auto_scale(db_session, mock_openclaw_client)
+    assert scaled_up == 1
+    assert scaled_down == 0
+
+
+async def test_auto_scale_down(db_session: Session, mock_openclaw_client):
+    """Test auto-scaling down when idle > min_size * 2."""
+    # Create 15 idle crons (15 > 5 * 2)
+    for i in range(15):
+        cron = OpenClawCronPoolDB(
+            openclaw_cron_id=f"cron-{i}",
+            status="idle",
+            last_active_at=utc_now(),
+        )
+        db_session.add(cron)
+    db_session.commit()
+
+    scaled_up, scaled_down = await cron_pool.auto_scale(db_session, mock_openclaw_client)
+    assert scaled_up == 0
+    assert scaled_down == 1
+
+
+def test_get_pool_status(db_session: Session):
+    """Test getting pool status."""
+    # Create mixed crons
+    for i in range(10):
+        status = ["idle", "busy", "stuck"][i % 3]
+        cron = OpenClawCronPoolDB(
+            openclaw_cron_id=f"cron-{i}",
+            status=status,
+            last_active_at=utc_now(),
+        )
+        db_session.add(cron)
+    db_session.commit()
+
+    status = cron_pool.get_pool_status(db_session)
+    assert status["total"] == 10
+    assert status["idle"] == 4  # 0, 3, 6, 9
+    assert status["busy"] == 3  # 1, 4, 7
+    assert status["stuck"] == 3  # 2, 5, 8
+    assert status["min_size"] == cron_pool.MIN_POOL_SIZE
+    assert status["max_size"] == cron_pool.MAX_POOL_SIZE
+
+
+async def test_sync_cron_states(db_session: Session, mock_openclaw_client):
+    """Test syncing cron states from OpenClaw."""
+    # Mock OpenClaw returning 2 crons
+    mock_openclaw_client.list_crons.return_value = [
+        OpenClawCron(id="cron-1", name="worker-1", schedule="* * * * *", enabled=True, state={"status": "busy"}),
+        OpenClawCron(id="cron-2", name="worker-2", schedule="* * * * *", enabled=True, state={"status": "idle"}),
+    ]
+
+    synced = await cron_pool.sync_cron_states(db_session, mock_openclaw_client)
+    assert synced == 2
+
+    # Verify crons added to DB
+    crons = db_session.exec(select(OpenClawCronPoolDB)).all()
+    assert len(crons) == 2
+
+
+def test_detect_stuck_crons(db_session: Session):
+    """Test detecting stuck crons."""
+    # Create crons with different last_active_at
+    now = utc_now()
+    active_cron = OpenClawCronPoolDB(
+        openclaw_cron_id="active",
+        status="busy",
+        last_active_at=now,
+    )
+    stuck_cron = OpenClawCronPoolDB(
+        openclaw_cron_id="stuck",
+        status="busy",
+        last_active_at=now - timedelta(minutes=15),  # 15 minutes ago
+    )
+    idle_cron = OpenClawCronPoolDB(
+        openclaw_cron_id="idle",
+        status="idle",
+        last_active_at=now - timedelta(minutes=20),
+    )
+    db_session.add_all([active_cron, stuck_cron, idle_cron])
+    db_session.commit()
+
+    stuck = cron_pool.detect_stuck_crons(db_session)
+    assert len(stuck) == 1
+    assert stuck[0].openclaw_cron_id == "stuck"
+
+
+async def test_handle_stuck_cron(db_session: Session, mock_openclaw_client):
+    """Test handling a stuck cron."""
+    from agenteval.storage.db import IntelligentEvalTaskQueueDB
+
+    # Create stuck cron with assigned task
+    cron = OpenClawCronPoolDB(
+        openclaw_cron_id="stuck-cron",
+        status="busy",
+        current_eval_id="eval-1",
+        last_active_at=utc_now() - timedelta(minutes=15),
+    )
+    db_session.add(cron)
+
+    task = IntelligentEvalTaskQueueDB(
+        eval_id="eval-1",
+        status="assigned",
+        priority=1,
+        reason="slot_due",
+        assigned_cron_id="stuck-cron",
+    )
+    db_session.add(task)
+    db_session.commit()
+
+    # Handle stuck cron
+    await cron_pool.handle_stuck_cron(cron, db_session, mock_openclaw_client)
+
+    # Verify task marked as failed
+    db_session.refresh(task)
+    assert task.status == "failed"
+    assert task.error == "Cron stuck"
+
+    # Verify new task created for retry
+    new_task = db_session.exec(
+        select(IntelligentEvalTaskQueueDB).where(
+            IntelligentEvalTaskQueueDB.eval_id == "eval-1",
+            IntelligentEvalTaskQueueDB.status == "pending",
+        )
+    ).first()
+    assert new_task is not None
+    assert new_task.reason == "cron_stuck_retry"
+    assert new_task.priority == 1
+
+    # Verify cron deleted
+    deleted_cron = db_session.exec(
+        select(OpenClawCronPoolDB).where(OpenClawCronPoolDB.openclaw_cron_id == "stuck-cron")
+    ).first()
+    assert deleted_cron is None