# Fix Summary: Docker Helper Always Returning Success

## Problem

The `check_docker_services()` function in `execute.py` always returned `success=True` even when Docker checks failed, preventing `determine_overall_status()` from detecting Docker problems.

### Root Cause

```python
# BEFORE (lines 49-78)
def check_docker_services(verbose: bool = False) -> dict:
    try:
        all_services = get_service_summary()  # May return {"success": False, "error": "..."}

        return {
            "success": True,  # ❌ Always True, even if get_service_summary() failed
            "total": all_services.get("total", 0),  # Returns 0 if failed
            "running": all_services.get("running", 0),
            # ...
        }
```

When `get_service_summary()` returned `{"success": False, "error": "Docker CLI unavailable"}`, the function would still return `success=True` with all counts set to 0. This prevented the status determination logic from detecting critical Docker failures.

## Solution

Added explicit check for Docker availability before returning success:

```python
# AFTER (lines 49-98)
def check_docker_services(verbose: bool = False) -> dict:
    try:
        all_services = get_service_summary()

        # ✅ Check if Docker is unavailable
        if not all_services.get("success", False):
            return {
                "success": False,
                "error": all_services.get("error", "Failed to check Docker services"),
                "total": 0,
                "running": 0,
                "stopped": 0,
                "unhealthy": 0,
                "healthy": 0,
                "details": {},
            }

        # Extract counts only if Docker is available
        total = all_services.get("total", 0)
        running = all_services.get("running", 0)
        # ...

        return {
            "success": True,  # ✅ Only returns True if Docker is working
            "total": total,
            # ...
        }
```

## What Now Works

The fix correctly detects and reports Docker failures:

1. **Docker CLI not installed** → `success=False` with error "command not found"
2. **Docker daemon not running** → `success=False` with connection error
3. **Permission denied** → `success=False` with permission error
4. **Any Docker exception** → `success=False` with exception message

## Integration with Status Determination

The `determine_overall_status()` function (line 213) already checks for Docker failure:

```python
if not services.get("success"):
    issues.append({
        "severity": "critical",
        "component": "docker",
        "issue": "Failed to check Docker services",
        "details": services.get("error", "Unknown error"),
    })
```

This means the overall system status will now correctly show "critical" when Docker is unavailable.

## Test Results

All 5 test scenarios pass:

```
Test 1: Normal operation (Docker working)
✓ PASS: Total: 36, Running: 21, Stopped: 15

Test 2: Docker CLI unavailable
✓ PASS: Returns success=False with error

Test 3: Docker permission denied
✓ PASS: Returns success=False with permission error

Test 4: Exception handling
✓ PASS: Returns success=False with exception message

Test 5: Integration with determine_overall_status
✓ PASS: Status correctly set to "critical" when Docker fails
```

## Files Modified

- `${CLAUDE_PLUGIN_ROOT}/skills/system-status/check-system-health/execute.py`
  - Updated `check_docker_services()` function (lines 49-98)
  - Added Docker availability check before returning success
  - Explicit count extraction for clarity

## Files Added

- `${CLAUDE_PLUGIN_ROOT}/skills/system-status/check-system-health/test_docker_failure.py`
  - Comprehensive test suite with 5 test scenarios
  - Tests Docker failures, permission issues, and status integration
  - Can be run to verify fix: `python3 test_docker_failure.py`

## Success Criteria

✅ Returns `success=False` when Docker CLI missing
✅ Returns `success=False` when Docker has permission issues
✅ Returns `success=False` when Docker daemon not running
✅ Returns `success=False` when any Docker exception occurs
✅ `determine_overall_status()` correctly detects Docker failures as critical
✅ All test scenarios pass

## Impact

- **Before**: Docker failures were silently ignored, system appeared healthy
- **After**: Docker failures are correctly detected and reported as critical issues

This fix ensures that monitoring systems can properly detect and alert on Docker infrastructure problems.
