feat: add Claude session awareness to Amplifier

- Create amplifier.claude module for Claude Code integrations
- Implement SessionAwareness for tracking multiple concurrent sessions
- Add CLI commands: status, track, broadcast, activity
- Include comprehensive test suite with 13 passing tests
- Store session data in .data/session_awareness/
- Auto-cleanup stale sessions after 5 minutes
- Support activity logging with automatic trimming
- Follow Amplifier's ruthless simplicity philosophy
- File-based JSON storage, no database complexity
- Fail silently to never disrupt workflows

🤖 Generated with Claude Code

Co-Authored-By: Claude <[email protected]>

Author: michaeljabbour

amplifier/claude/__init__.py

@@ -0,0 +1,10 @@
+"""
+Claude integration module for Amplifier.
+
+Provides session awareness and coordination capabilities for Claude Code.
+"""
+
+from .session_awareness import SessionActivity
+from .session_awareness import SessionAwareness
+
+__all__ = ["SessionAwareness", "SessionActivity"]

amplifier/claude/cli.py

@@ -0,0 +1,98 @@
+"""
+CLI commands for Claude integration features.
+"""
+
+from datetime import UTC
+from datetime import datetime
+
+import click
+
+from amplifier.claude.session_awareness import SessionAwareness
+
+
+@click.group("claude")
+def claude_group():
+    """Claude Code integration features."""
+    pass
+
+
+@claude_group.command("status")
+def session_status():
+    """Show status of active Claude sessions."""
+    sa = SessionAwareness()
+    status = sa.get_status()
+
+    click.echo("\n🔄 Claude Session Awareness Status")
+    click.echo("=" * 40)
+    click.echo(f"Current Session: {status['current_session']}")
+    click.echo(f"Active Sessions: {status['active_sessions']}")
+
+    if status["sessions"]:
+        click.echo("\n📊 Active Sessions:")
+        for session in status["sessions"]:
+            click.echo(
+                f"  • {session['id']} (PID: {session['pid']}) "
+                f"- {session['duration_minutes']}min "
+                f"- Last: {session['last_activity'] or 'No activity'}"
+            )
+
+    if status["recent_activity"]:
+        click.echo("\n📝 Recent Activity:")
+        for activity in status["recent_activity"][:5]:
+            click.echo(f"  • [{activity['session']}] {activity['action']} ({activity['ago_seconds']}s ago)")
+            if activity["details"]:
+                click.echo(f"    → {activity['details']}")
+
+
+@claude_group.command("track")
+@click.argument("action")
+@click.option("--details", "-d", help="Additional details about the action")
+def track_activity(action: str, details: str | None):
+    """Track an activity for the current session.
+
+    Example:
+        amplifier claude track "Working on feature X" -d "Adding session awareness"
+    """
+    sa = SessionAwareness()
+    sa.register_activity(action, details)
+    click.echo(f"✅ Tracked: {action}")
+
+
+@claude_group.command("broadcast")
+@click.argument("message")
+def broadcast_message(message: str):
+    """Broadcast a message to all active sessions.
+
+    Example:
+        amplifier claude broadcast "Starting deployment - please pause edits"
+    """
+    sa = SessionAwareness()
+    sa.broadcast_message(message)
+    click.echo(f"📢 Broadcast sent: {message}")
+
+
+@claude_group.command("activity")
+@click.option("--limit", "-n", default=20, help="Number of activities to show")
+def show_activity(limit: int):
+    """Show recent activity across all sessions."""
+    sa = SessionAwareness()
+    activities = sa.get_recent_activity(limit)
+
+    if not activities:
+        click.echo("No recent activity found.")
+        return
+
+    click.echo("\n📜 Recent Activity Log:")
+    click.echo("=" * 40)
+
+    for activity in activities:
+        timestamp = datetime.fromtimestamp(activity.timestamp, UTC).strftime("%H:%M:%S")
+        click.echo(f"[{timestamp}] {activity.session_id}: {activity.action}")
+        if activity.details:
+            click.echo(f"  → {activity.details}")
+
+
+# Register the command group
+def register_commands(cli):
+    """Register Claude commands with the main CLI."""
+    cli.add_command(claude_group)

amplifier/claude/session_awareness.py

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+"""
+Session awareness for Claude Code sessions.
+
+Enables multiple Claude sessions to be aware of each other's activity
+in the same project directory.
+"""
+
+import json
+import logging
+import os
+import time
+from dataclasses import asdict
+from dataclasses import dataclass
+from dataclasses import field
+from pathlib import Path
+from typing import Any
+
+logger = logging.getLogger(__name__)
+
+# Configuration
+STALE_THRESHOLD_SECONDS = 300  # 5 minutes
+MAX_ACTIVITY_LOG_SIZE = 1000  # Keep last 1000 activities
+
+
+@dataclass
+class SessionActivity:
+    """Represents a single activity from a Claude session."""
+
+    session_id: str
+    timestamp: float
+    action: str
+    details: str | None = None
+
+
+@dataclass
+class SessionInfo:
+    """Information about an active Claude session."""
+
+    session_id: str
+    pid: int
+    started: float
+    last_seen: float
+    activities: list[SessionActivity] = field(default_factory=list)
+
+    @property
+    def is_stale(self) -> bool:
+        """Check if session hasn't been seen recently."""
+        return time.time() - self.last_seen > STALE_THRESHOLD_SECONDS
+
+
+class SessionAwareness:
+    """Manages awareness of multiple Claude Code sessions."""
+
+    def __init__(self, project_root: Path | None = None):
+        """Initialize session awareness.
+
+        Args:
+            project_root: Root directory for the project. Defaults to current directory.
+        """
+        self.project_root = project_root or Path.cwd()
+        self.data_dir = self.project_root / ".data" / "session_awareness"
+        self.sessions_file = self.data_dir / "sessions.json"
+        self.activity_log = self.data_dir / "activity.jsonl"
+
+        # Create data directory if needed
+        self.data_dir.mkdir(parents=True, exist_ok=True)
+
+        # Get session ID from environment or generate one
+        self.session_id = os.environ.get("CLAUDE_SESSION_ID", f"session-{os.getpid()}")
+        self.pid = os.getpid()
+
+    def _load_sessions(self) -> dict[str, SessionInfo]:
+        """Load active sessions from disk."""
+        if not self.sessions_file.exists():
+            return {}
+
+        try:
+            with open(self.sessions_file) as f:
+                data = json.load(f)
+                sessions = {}
+                for sid, info in data.items():
+                    # Convert activity dicts to SessionActivity objects
+                    activities = [
+                        SessionActivity(**act) if isinstance(act, dict) else act for act in info.get("activities", [])
+                    ]
+                    sessions[sid] = SessionInfo(
+                        session_id=info["session_id"],
+                        pid=info["pid"],
+                        started=info["started"],
+                        last_seen=info["last_seen"],
+                        activities=activities,
+                    )
+                return sessions
+        except (json.JSONDecodeError, KeyError) as e:
+            logger.warning(f"Failed to load sessions: {e}")
+            return {}
+
+    def _save_sessions(self, sessions: dict[str, SessionInfo]) -> None:
+        """Save active sessions to disk."""
+        try:
+            data = {sid: asdict(info) for sid, info in sessions.items()}
+            with open(self.sessions_file, "w") as f:
+                json.dump(data, f, indent=2)
+        except Exception as e:
+            logger.error(f"Failed to save sessions: {e}")
+
+    def _log_activity(self, activity: SessionActivity) -> None:
+        """Append activity to the activity log."""
+        try:
+            with open(self.activity_log, "a") as f:
+                f.write(json.dumps(asdict(activity)) + "\n")
+        except Exception as e:
+            logger.error(f"Failed to log activity: {e}")
+
+    def _trim_activity_log(self) -> None:
+        """Keep only the last MAX_ACTIVITY_LOG_SIZE entries."""
+        if not self.activity_log.exists():
+            return
+
+        try:
+            with open(self.activity_log) as f:
+                lines = f.readlines()
+
+            if len(lines) > MAX_ACTIVITY_LOG_SIZE:
+                with open(self.activity_log, "w") as f:
+                    f.writelines(lines[-MAX_ACTIVITY_LOG_SIZE:])
+        except Exception as e:
+            logger.error(f"Failed to trim activity log: {e}")
+
+    def register_activity(self, action: str, details: str | None = None) -> None:
+        """Register an activity for the current session.
+
+        Args:
+            action: The action being performed (e.g., "Edit", "Read", "Test")
+            details: Optional details about the action
+        """
+        sessions = self._load_sessions()
+
+        # Clean up stale sessions
+        active_sessions = {sid: info for sid, info in sessions.items() if not info.is_stale}
+
+        # Update current session
+        activity = SessionActivity(session_id=self.session_id, timestamp=time.time(), action=action, details=details)
+
+        if self.session_id not in active_sessions:
+            active_sessions[self.session_id] = SessionInfo(
+                session_id=self.session_id, pid=self.pid, started=time.time(), last_seen=time.time(), activities=[]
+            )
+
+        session = active_sessions[self.session_id]
+        session.last_seen = time.time()
+        session.activities.append(activity)
+
+        # Keep only recent activities per session
+        if len(session.activities) > 10:
+            session.activities = session.activities[-10:]
+
+        # Save and log
+        self._save_sessions(active_sessions)
+        self._log_activity(activity)
+        self._trim_activity_log()
+
+        logger.debug(f"Session {self.session_id}: {action}")
+
+    def get_active_sessions(self) -> list[SessionInfo]:
+        """Get list of currently active sessions."""
+        sessions = self._load_sessions()
+        return [info for info in sessions.values() if not info.is_stale]
+
+    def get_recent_activity(self, limit: int = 20) -> list[SessionActivity]:
+        """Get recent activity across all sessions.
+
+        Args:
+            limit: Maximum number of activities to return
+
+        Returns:
+            List of recent activities, newest first
+        """
+        if not self.activity_log.exists():
+            return []
+
+        activities = []
+        try:
+            with open(self.activity_log) as f:
+                for line in f:
+                    if line.strip():
+                        activities.append(SessionActivity(**json.loads(line)))
+        except Exception as e:
+            logger.error(f"Failed to read activity log: {e}")
+
+        # Sort by timestamp descending and return limited results
+        activities.sort(key=lambda a: a.timestamp, reverse=True)
+        return activities[:limit]
+
+    def get_status(self) -> dict[str, Any]:
+        """Get comprehensive status of session awareness.
+
+        Returns:
+            Dictionary with status information
+        """
+        active_sessions = self.get_active_sessions()
+        recent_activity = self.get_recent_activity(10)
+
+        return {
+            "current_session": self.session_id,
+            "active_sessions": len(active_sessions),
+            "sessions": [
+                {
+                    "id": s.session_id,
+                    "pid": s.pid,
+                    "duration_minutes": round((time.time() - s.started) / 60, 1),
+                    "last_activity": (s.activities[-1].action if s.activities else None),
+                }
+                for s in active_sessions
+            ],
+            "recent_activity": [
+                {
+                    "session": a.session_id,
+                    "action": a.action,
+                    "ago_seconds": round(time.time() - a.timestamp),
+                    "details": a.details,
+                }
+                for a in recent_activity
+            ],
+        }
+
+    def broadcast_message(self, message: str) -> None:
+        """Broadcast a message to all active sessions.
+
+        Args:
+            message: Message to broadcast
+        """
+        # For now, just log it as an activity
+        # Future: Could write to a messages file that other sessions poll
+        self.register_activity("Broadcast", message)
+        logger.info(f"Broadcasting: {message}")