When trying to run your first agent (https://js.langchain.com/docs/integrations/tools/tavily_search#usage) in Langchain, you will probably run into the following error:
The problem is that Hub Pull returns false. That is this part of the code:
const prompt = await pull<ChatPromptTemplate>(
“hwchase17/openai-functions-agent“
);
“hwchase17/openai-functions-agent“
);
To solve the problem, remove the code above and define a different prompt with a MessagesPlaceholder of “agent_scratchpad” like so:
const prompt = ChatPromptTemplate.fromMessages([
new MessagesPlaceholder(“agent_scratchpad“),
[“user“, “{input}“],
[“user“, “Answer the question in detail and state your source.“],
]);
new MessagesPlaceholder(“agent_scratchpad“),
[“user“, “{input}“],
[“user“, “Answer the question in detail and state your source.“],
]);
The text (“Answer the question in detail and state your source.”) can be any instructions you want.
This fixed mine.
You can find more tutorials on my YouTube channel (https://www.youtube.com/@njokusamsonebere2589) where I teach JavaScript and AI extensively.
