Sentry Mode Skill

Sentry Mode

Webcam-based surveillance with AI-powered analysis. Ask a question, get a visual answer.

Quick Start

Activate Sentry Mode

sentry-mode activate --query "Is anyone in the room?"

Output:

📹 Sentry Mode Activated
🎥 Recording video (3 seconds)...
🔍 Extracting frames (ffmpeg)...
🤖 Analyzing with vision AI...

📊 REPORT:
Query: Is anyone in the room?
Status: ✅ Yes
Details: One person visible at desk, facing monitor
Confidence: High
Timestamp: 2026-01-27 11:15:00 MST

Supported Queries

People Detection:

• "Is anyone in the room?"
• "How many people are visible?"
• "Is my person in frame?"

Object Detection:

• "What's on my desk?"
• "Any open windows or doors?"
• "What's the room status?"

Movement:

• "Any movement detected?"
• "Is anything changed since last check?"
• "Any activity in the frame?"

Text Recognition:

• "Read any visible text"
• "What's on the screen?"
• "Any readable text visible?"

General Status:

• "Take a snapshot and describe"
• "What do you see?"
• "Analyze the current view"

How It Works

Step 1: Capture Video

• Access webcam via ffmpeg or system tool
• Record 3-5 seconds of video
• Save to temp file

Step 2: Extract Frames

• Use ffmpeg to extract 3-5 key frames from video
• Convert to images
• Select most relevant frames

Step 3: Analyze with Vision AI

• Send frames to Claude vision model
• Include your query in the prompt
• Get detailed analysis

Step 4: Report Findings

• Summarize results
• Note confidence level
• Provide timestamp
• Suggest actions if needed

Examples

Example 1: Check Room Occupancy

sentry-mode activate --query "Is anyone in the room?"

Response:

✅ YES - One person visible
- Person at desk, facing left
- Seated position
- No visible movement
- Confidence: High

Example 2: Monitor Desk

sentry-mode activate --query "What's on my desk and is it organized?"

Response:

📊 DESK STATUS:
Items visible:
- Laptop (open, screen active)
- Coffee cup (left side)
- Papers (scattered)
- Keyboard and mouse (centered)
- Phone (right side)

Organization: Fair
Notes: Some papers could be filed
Confidence: High

Example 3: Detect Motion

sentry-mode activate --query "Any movement or activity?"

Response:

🎬 MOTION ANALYSIS:
Primary frames: 5 extracted
Movement detected: Yes
Type: Person typing/working
Duration: Continuous across frames
Intensity: Light (sitting activity)
Confidence: High

Configuration

Default Settings

• Duration: 3 seconds video
• Frames: Extract 5 key frames
• Format: JPEG images
• Analysis: Claude vision AI (latest)
• Confidence threshold: Medium+

Adjustable Options

sentry-mode activate \
  --query "Is anyone in the room?" \
  --duration 5 \  # seconds
  --frames 8 \    # number to extract
  --confidence high  # high/medium/low

Technical Details

Dependencies

• ffmpeg (video capture + frame extraction)
• Claude vision API (analysis)
• Node.js or similar (orchestration)

Supported Cameras

• Built-in webcam (default)
• USB cameras
• IP cameras (if accessible locally)

Output Formats

• Text report (default)
• JSON (with --format json)
• Detailed analysis (with --verbose)

Privacy & Storage

• Videos deleted immediately after frame extraction
• Frames deleted after analysis
• No persistent storage by default
• Analysis results retained in conversation only

Use Cases

Workspace Monitoring:

• Verify you're at your desk
• Check desk organization
• Monitor for interruptions

Security Checks:

• Confirm room is empty
• Verify doors/windows status
• Detect unauthorized access

Activity Logging:

• Track work sessions
• Monitor room activity
• Verify presence for time tracking

Visual Tasks:

• Read text from screen
• Confirm object placement
• Check visual status

Remote Management:

• Monitor remote workspace
• Check equipment status
• Verify installations/setups

Limitations

• Lighting: Works best in good lighting
• Angles: Fixed to webcam position
• Privacy: Captures everything in view (use responsibly)
• Detail: Cannot identify specific individuals
• Depth: No 3D information (2D analysis only)

Security & Privacy Notes

⚠️ Important:

• This records video from your workspace
• Ensure privacy compliance in shared spaces
• Consider consent from others in frame
• Data is processed via Claude API (follows Anthropic privacy policy)
• Local storage: None by default

Troubleshooting

Camera won't activate

• Check system permissions (macOS may require camera access)
• Verify camera is not in use by other app
• Try specifying camera explicitly: --camera 0

Low-quality frames

• Improve lighting
• Move closer to camera
• Increase extraction frame count
• Check camera lens for dirt

Analysis too generic

• Be more specific in query
• Try multiple queries
• Use --verbose for detailed output
• Specify what to focus on

Scripts

• sentry-mode.js - Main orchestrator (capture → extract → analyze → report)
• webcam-capture.js - ffmpeg wrapper for video capture
• frame-extractor.js - Extract key frames from video
• vision-analyzer.js - Send frames to Claude + parse response

References

• SETUP.md - Camera permissions and device setup
• EXAMPLES.md - Real-world usage scenarios
• BOLO.md - Be On The Lookout mode (continuous monitoring with watchlists)