diff --git a/core/task.rbs b/core/task.rbs
new file mode 100644
index 0000000..5a45285
--- /dev/null
+++ b/core/task.rbs
@@ -0,0 +1,48 @@
+class Task < Object
+  def self.get: () -> Task
+              | (String name) -> Task?
+
+  alias self.current self.get
+
+  def self.list: () -> Array[Task]
+
+  def self.name_list: () -> Array[String]
+
+  def name: () -> String
+  def self.name: () -> String
+
+  def name=: (String name) -> String
+  def self.name=: (String name) -> String
+
+  def priority: () -> Integer
+  def self.priority: () -> Integer
+
+  def priority=: (Integer priority) -> Integer
+  def self.priority=: (Integer priority) -> Integer
+
+  def status: () -> String
+
+  def suspend: () -> void
+  def self.suspend: () -> void
+
+  def resume: () -> void
+
+  def terminate: () -> void
+  def self.terminate: () -> void
+
+  # TODO: Exception
+  def raise: () -> void
+  #        | (Exception exception)
+
+  def join: () -> Task
+
+  def value: () -> untyped
+
+  def pass: () -> void
+
+  def self.create: (String byte_code, ?Integer regs_size) -> Task
+
+  def run: () -> void
+
+  def rewind: () -> void
+end
diff --git a/test/task.rb b/test/task.rb
new file mode 100644
index 0000000..86bf834
--- /dev/null
+++ b/test/task.rb
@@ -0,0 +1,52 @@
+# frozen_string_literal: true
+
+task = Task.current
+
+Task.get
+Task.get 'name'
+
+Task.current
+Task.current ''
+
+Task.list
+
+Task.name_list
+
+task.name
+Task.name
+
+task.name = ''
+Task.name = ''
+
+task.priority
+Task.priority
+
+task.priority = 0
+Task.priority = 0
+
+task.status
+
+task.suspend
+Task.suspend
+
+task.resume
+
+task.terminate
+Task.terminate
+
+task.raise
+
+task.join
+
+task.value
+
+task.pass
+
+Task.create ''
+Task.create '', 4
+
+task.run
+
+task.rewind
+
+# rubocop:enable all