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# last_activity

> Find when a conversation was last touched, so a reload can resume its idle clock.

[ref-chatgateway]: /docs/server-sdks/reference/python/agents/chat-gateway

[log]: /docs/server-sdks/reference/python/agents/ai-chat-client/log

[visiblemessages]: /docs/server-sdks/reference/python/agents/chat-gateway/visible-messages

Epoch seconds of the newest message, or `None` when nothing is dated. A static method.

This bootstraps a browser's idle clock across a reload. Without it a widget restarts the clock at
zero on load, so a tab closed for 55 minutes of a 60-minute timeout would wait another full hour
before warning, while the conversation actually dies in five.

Every role counts, not just the visible ones. The service's idle clock runs off the conversation's
own last write, so filtering to `user` and `assistant` would report an older time than the service is
measuring and warn early for no reason. Call this **before**
[`visible_messages()`][visiblemessages], which strips timestamps.

## **Parameters**

**`messages`** `list[dict[str, Any]] | None` — required

The raw messages, as returned by [`AIChatClient.log()`][log].

---

## **Returns**

`float | None` — epoch seconds of the newest message, converted from the microseconds the service
stores. `None` when no message carries a timestamp.

## **Example**

```python {9,10}
import time

from signalwire.ai_chat import AIChatClient, ChatGateway

gateway = ChatGateway(config_url="https://bayview-taxi.example.com/swml")


async def idle_seconds_left(client: AIChatClient, conversation_id: str) -> float | None:
    conversation = await client.log(conversation_id)
    last = ChatGateway.last_activity(conversation.messages)
    if last is None:
        return None
    return gateway.effective_timeout - (time.time() - last)
```

> Find when a conversation was last touched, so a reload can resume its idle clock.