--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/courses/course.txt	Sun Aug 17 17:47:02 2025 +0900
@@ -0,0 +1,5 @@
+Course Design
+
+This is an AI language learning website using the Claude API.  Users can create courses on this website by entering a system prompt for Claude.  The purpose of this thread/chat is to help users design these courses, mostly by editing the system prompt of the course.  This website also has text-to-speech and speech-to-text using OpenAI.  A course also has instructions for text-to-speech.
+
+Users can discuss a chat with you by giving you a chat ID so you can read the chat using the tool/function `get_chat`.

--- a/src/lib/ai/claude/Ai_chat.luan	Sun Aug 17 16:59:37 2025 +0900
+++ b/src/lib/ai/claude/Ai_chat.luan	Sun Aug 17 17:47:02 2025 +0900
@@ -73,31 +73,55 @@
 	end_for
 end
 
+local function get_chat(chat_id)
+	local Chat = require "site:/lib/Chat.luan"
+	local User = require "site:/lib/User.luan"
+	local chat = Chat.get_by_id(chat_id) or error()
+	local user = User.current()
+	local is_owner = user ~= nil and user.id == chat.user_id
+	is_owner or not chat.is_private or error "private"
+	return chat
+end
+
 local functions = {
-	get_thread = {
+	get_chat = {
 		tool = {
-			description = "Get the contents of a thread/chat with Claude on this website.  The contents will be JSON in the format of the Claude API."
+			description = "Get the contents of a chat/thread with Claude on this website.  The contents will be JSON in the format of the Claude API."
 			input_schema = {
 				type = "object"
 				properties = {
-					thread_id = {
-						description = "The ID of the thread"
-						type = "string"
+					chat_id = {
+						description = "The ID of the chat"
+						type = "integer"
 					}
 				}
 			}
 		}
 		fn = function(input)
-			local Chat = require "site:/lib/Chat.luan"
-			local User = require "site:/lib/User.luan"
-			local thread_id = input.thread_id or error()
-			local chat = Chat.get_by_id(thread_id) or error()
-			local user = User.current()
-			local is_owner = user ~= nil and user.id == chat.user_id
-			is_owner or not chat.is_private or error "private"
+			local chat_id = input.chat_id or error()
+			local chat = get_chat(chat_id)
 			return chat.ai_thread or error()
 		end
 	}
+	get_tts_instructions = {
+		tool = {
+			description = "Get the text-to-speech instructions of a chat/thread on this website.  These instruction are passed to OpenAI.  If there are no instructions, the empty string is returned."
+			input_schema = {
+				type = "object"
+				properties = {
+					chat_id = {
+						description = "The ID of the chat"
+						type = "integer"
+					}
+				}
+			}
+		}
+		fn = function(input)
+			local chat_id = input.chat_id or error()
+			local chat = get_chat(chat_id)
+			return chat.tts_instructions or error()
+		end
+	}
 }
 local tools = {nil}
 for name, f in pairs(functions) do