Chats & Threads

Record and replay chat conversations in your chatbot app. Helps you understand where your chatbot falls short and how to improve it.

Chats integrate seamlessly with traces by reconciliating messages with LLM calls and agents.

Feedback tracking

You can record chats in the backend or directly on the frontend if it's easier for you.

Setup the SDK

Open a thread

Start by opening a thread.

const thread = lunary.openThread()
thread = lunary.open_thread()

You can resume an existing thread by passing an ID from an existing thread.

// Save `` somewhere
const thread = lunary.openThread({
id: 'your-thread-id'; // Replace with your actual thread ID
# Save `` somewhere
existing_thread_id = 'your-thread-id' # Replace with your actual thread ID
thread = lunary.open_thread(existing_thread_id)

You can also add tags to a thread by passing a object with a tags param:

const thread = lunary.openThread({
tags: ['support']
thread = lunary.open_thread(existing_thread_id, tags=['support'])

Track messages

Now you can track messages. The supported roles are assistant, user, system, & tool.

role: 'user',
content: 'Hello, please help me'
role: 'assistant',
content: 'Hello, how can I help you?'
"role": "user",
"content": "Hello, please help me"
"role": "assistant",
"content": "Hello, how can I help you?"

Capture user feedback

Finally, you can track user feedback on bot replies:

The ID is the same as the one returned by trackMessage.

const msgId = thread.trackMessage({
role: "assistant",
content: "Hope you like my answers :)"
lunary.trackFeedback(msgId, { thumb: "up" })
msg_id = thread.track_message({
"role": "assistant",
"content": "Hope you like my answers :)"
lunary.track_feedback(msg_id, { "thumb": "up" })

To remove feedback, pass null as the feedback data.

lunary.trackFeedback(msgId, { thumb: null })
lunary.track_feedback(msg_id, { "thumb": None })

Reconciliate with LLM calls & agents

To take full advantage of Lunary's tracing capabilities, you can reconcile your LLM and agents runs with the messages.

We will automatically reconciliate messages with runs.

const msgId = thread.trackMessage({ role: "user", content: "Hello!" })
const res = await
model: "gpt-4o",
temperature: 1,
messages: [message],
role: "assistant",
content: res.choices[0].message.content
msg_id = thread.track_message({ "role": "user", "content": "Hello!" })
chat_completion =
{"role": "assistant", "content": chat_completion.choices[0].message.content})

If you're using LangChain or agents behind your chatbot, you can inject the current message id into context as a parent:

const msgId = thread.trackMessage({ role: "user", content: "Hello!" })
// In your backend, inject the message id into the context
const agent = lunary.wrapAgent(function ChatbotAgent(query) {
// your custom code...
await agent("Hello!").setParent(msgId)
msg_id = thread.track_message({ "role": "user", "content": "Hello!" })
# In your backend, inject the message id into the context
with lunary.parent(msg_id):
# your custom code...

Note that it's safe to pass the message ID from your frontend to your backend, if you're tracking chats directly on the frontend for example.

Questions? We're here to help.