AgentObservability

---
name: AgentObservability
description: |
license: MIT
---

# Agent Observability Skill

## When to Activate This Skill
- User wants to monitor agent activity
- Need to debug multi-agent workflows
- Track parallel subagent execution
- Visualize tool usage patterns
- Analyze session flows in real-time

## Prerequisites

- Bun runtime installed
- Claude Code with hooks configured
- PAI_DIR environment variable set

## Installation

See [SETUP.md](./SETUP.md) for complete installation instructions.

**Quick Setup:**

```bash
# 1. Set environment variable
export PAI_DIR="$HOME/.claude"  # Add to ~/.zshrc or ~/.bashrc

# 2. Configure hooks (merge into ~/.claude/settings.json)
cat settings.json.example

# 3. Create directory structure
mkdir -p ~/.claude/history/raw-outputs

# 4. Install dependencies
cd apps/server && bun install
cd ../client && bun install
```

## Usage

### Start the Observability Dashboard

**Terminal 1 - Server:**
```bash
cd ~/Projects/PAI/skills/agent-observability/apps/server
bun run dev
```

**Terminal 2 - Client:**
```bash
cd ~/Projects/PAI/skills/agent-observability/apps/client
bun run dev
```

**Open browser:** http://localhost:5173

### Using Claude Code

Once the dashboard is running, any Claude Code activity will appear in real-time:

1. Open Claude Code
2. Use any tool (Read, Write, Bash, etc.)
3. Launch subagents with Task tool
4. Watch events appear in the dashboard

### Event Types Captured

- **SessionStart** - New Claude Code session begins
- **UserPromptSubmit** - User sends a message
- **PreToolUse** - Before a tool is executed
- **PostToolUse** - After a tool completes
- **Stop** - Main agent task completes
- **SubagentStop** - Subagent task completes
- **SessionEnd** - Session ends

## Features

### Real-Time Visualization

- **Agent Swim Lanes:** See multiple agents (kai, designer, engineer, etc.) running in parallel
- **Event Timeline:** Chronological view of all events
- **Tool Usage Charts:** Visualize which tools are being used most
- **Session Tracking:** Track individual sessions and their lifecycles

### Filtering & Search

- Filter by agent name (kai, designer, engineer, pentester, etc.)
- Filter by event type (PreToolUse, PostToolUse, etc.)
- Filter by session ID
- Search event payloads

### Data Storage

Events are stored in JSONL (JSON Lines) format:

```
~/.claude/history/raw-outputs/YYYY-MM/YYYY-MM-DD_all-events.jsonl
```

Each line is a complete JSON object:
```jsonl
{"source_app":"kai","session_id":"abc123","hook_event_type":"PreToolUse","payload":{...},"timestamp":1234567890,"timestamp_pst":"2025-01-28 14:30:00 PST"}
```

### In-Memory Streaming

- Server keeps last 1000 events in memory
- Low memory footprint
- Fast real-time updates via WebSocket
- No database overhead

## Architecture

```
┌─────────────────┐
│  Claude Code    │  Executes hooks on events
│   (with hooks)  │
└────────┬────────┘
         │
         ▼
┌─────────────────┐
│ capture-all-    │  Appends events to JSONL
│ events.ts hook  │
└────────┬────────┘
         │
         ▼
┌─────────────────────────────────────┐
│ ~/.claude/history/raw-outputs/      │  Daily JSONL files
│ 2025-01/2025-01-28_all-events.jsonl │
└────────┬────────────────────────────┘
         │
         ▼
┌─────────────────┐
│ file-ingest.ts  │  Watches files, streams to memory
│  (Bun server)   │
└────────┬────────┘
         │
         ▼
┌─────────────────┐
│  Vue 3 Client   │  Real-time dashboard visualization
│  (Vite + Tail)  │
└─────────────────┘
```

## Configuration

### Environment Variables

**PAI_DIR:**
Path to your PAI directory (defaults to `~/.claude/`)

```bash
export PAI_DIR="/Users/yourname/.claude"
```

### Hooks Configuration

Add to `~/.claude/settings.json` (see `settings.json.example` for full template):

```json
{
  "hooks": {
    "PreToolUse": [{
      "matcher": "*",
      "hooks": [{
        "type": "command",
        "command": "${PAI_DIR}/skills/agent-observability/hooks/capture-all-events.ts --event-type PreToolUse"
      }]
    }],
    // ... other hooks
  }
}
```

## Troubleshooting

### No events appearing

1. Check PAI_DIR is set: `echo $PAI_DIR`
2. Verify directory exists: `ls ~/.claude/history/raw-outputs/`
3. Check hook is executable: `ls -l hooks/capture-all-events.ts`
4. Look for today's events file: `ls ~/.claude/history/raw-outputs/$(date +%Y-%m)/`

### Server won't start

1. Check Bun is installed: `bun --version`
2. Verify dependencies: `cd apps/server && bun install`
3. Check port 3001 isn't in use: `lsof -i :3001`

### Client won't connect

1. Ensure server is running first
2. Check WebSocket connection in browser console
3. Verify no firewall blocking localhost:3001

## Credits

**Inspired by [@indydevdan](https://github.com/indydevdan)**'s pioneering work on multi-agent observability for Claude Code.

**Our implementation differs** by using filesystem-based event capture and in-memory streaming instead of SQLite database persistence. Both approaches have their merits! Check out indydevdan's work for a database-backed solution with full historical persistence.

## Development

### Running in Development

```bash
# Server (hot reload)
cd apps/server
bun --watch src/index.ts

# Client (Vite dev server)
cd apps/client
bun run dev
```

### Building for Production

```bash
# Client build
cd apps/client
bun run build
bun run preview
```

### Adding New Event Types

1. Update `capture-all-events.ts` hook if needed
2. Add hook configuration to `settings.json`
3. Client will automatically display new event types

## Documentation

- [README.md](./README.md) - Complete documentation
- [SETUP.md](./SETUP.md) - Installation guide
- [history-structure/](./history-structure/) - Data storage structure
- [settings.json.example](./settings.json.example) - Hook configuration template

## License

Part of the [PAI (Personal AI Infrastructure)](https://github.com/danielmiessler/PAI) project.

## Contributing

Contributions welcome! Areas for improvement:

- Historical data persistence options
- Export functionality (CSV, JSON)
- Alert/notification system
- Advanced filtering and search
- Session replay capability
- Integration with other PAI skills