'\n\nHuman: <admin>You are a helpful chatbot</admin>\n\nHuman: Tell me a joke about bears\n\nAssistant:'
'\n\nYou are a helpful chatbot\n\nHuman: Tell me a joke about bears\n\nAssistant:'
```
We can see that under the hood LangChain is representing `SystemMessage`s with `Human: <admin>...</admin>`,
and is appending an assistant message to the end IF the last message is NOT already an assistant message.
We can see that under the hood LangChain is not appending any prefix/suffix to `SystemMessage`'s. This is because Anthropic has no concept of `SystemMessage`.
Anthropic requires all prompts to end with assistant messages. This means if the last message is not an assistant message, the suffix `Assistant:` will automatically be inserted.
If you decide instead to use a normal PromptTemplate (one that just works on a single string) let's take a look at