diff --git a/tasks/cli.py b/tasks/cli.py
new file mode 100644
index 0000000..363a36d
--- /dev/null
+++ b/tasks/cli.py
@@ -0,0 +1,61 @@
+import argparse
+import sys
+from db import init_db, add_task, list_tasks, update_task, delete_task
+
+def main():
+    init_db()
+    
+    parser = argparse.ArgumentParser(description="Plexus Task Tracker")
+    subparsers = parser.add_subparsers(dest="command")
+    
+    # Add task
+    add_parser = subparsers.add_parser("add", help="Add a new task")
+    add_parser.add_argument("title", help="Task title")
+    
+    # List tasks
+    list_parser = subparsers.add_parser("list", help="List tasks")
+    list_parser.add_argument("--status", help="Filter by status")
+    
+    # Update task
+    update_parser = subparsers.add_parser("update", help="Update task status")
+    update_parser.add_argument("id", type=int, help="Task ID")
+    update_parser.add_argument("status", help="New status")
+    
+    # Done task
+    done_parser = subparsers.add_parser("done", help="Mark task as done")
+    done_parser.add_argument("id", type=int, help="Task ID")
+    
+    # Delete task
+    delete_parser = subparsers.add_parser("delete", help="Delete a task")
+    delete_parser.add_argument("id", type=int, help="Task ID")
+    
+    args = parser.parse_args()
+    
+    if args.command == "add":
+        add_task(args.title)
+        print(f"Task added: {args.title}")
+    
+    elif args.command == "list":
+        tasks = list_tasks(args.status)
+        print(f"{'ID':<5} {'Status':<15} {'Title'}")
+        print("-" * 40)
+        for t in tasks:
+            print(f"{t[0]:<5} {t[2]:<15} {t[1]}")
+            
+    elif args.command == "update":
+        update_task(args.id, args.status)
+        print(f"Task {args.id} updated to {args.status}")
+        
+    elif args.command == "done":
+        update_task(args.id, "done")
+        print(f"Task {args.id} marked as done")
+        
+    elif args.command == "delete":
+        delete_task(args.id)
+        print(f"Task {args.id} deleted")
+        
+    else:
+        parser.print_help()
+
+if __name__ == "__main__":
+    main()
diff --git a/tasks/db.py b/tasks/db.py
new file mode 100644
index 0000000..6ca5d35
--- /dev/null
+++ b/tasks/db.py
@@ -0,0 +1,48 @@
+import duckdb
+import os
+
+DB_PATH = "data/tasks.duckdb"
+
+def init_db():
+    if not os.path.exists("data"):
+        os.makedirs("data")
+    
+    con = duckdb.connect(DB_PATH)
+    con.execute("""
+        CREATE TABLE IF NOT EXISTS tasks (
+            id INTEGER PRIMARY KEY,
+            title VARCHAR,
+            status VARCHAR DEFAULT 'todo',
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+        )
+    """)
+    con.execute("CREATE SEQUENCE IF NOT EXISTS seq_task_id START 1")
+    con.close()
+
+def get_connection():
+    return duckdb.connect(DB_PATH)
+
+def add_task(title):
+    con = get_connection()
+    con.execute("INSERT INTO tasks (id, title) VALUES (nextval('seq_task_id'), ?)", [title])
+    con.close()
+
+def list_tasks(status=None):
+    con = get_connection()
+    if status:
+        res = con.execute("SELECT * FROM tasks WHERE status = ? ORDER BY id", [status]).fetchall()
+    else:
+        res = con.execute("SELECT * FROM tasks ORDER BY id").fetchall()
+    con.close()
+    return res
+
+def update_task(task_id, status):
+    con = get_connection()
+    con.execute("UPDATE tasks SET status = ?, updated_at = CURRENT_TIMESTAMP WHERE id = ?", [status, task_id])
+    con.close()
+
+def delete_task(task_id):
+    con = get_connection()
+    con.execute("DELETE FROM tasks WHERE id = ?", [task_id])
+    con.close()