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Elixir implementation of a LangChain style framework that lets Elixir projects integrate with and leverage LLMs.
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lib/chains/llm_chain/modes/while_needs_response.ex
defmodule LangChain.Chains.LLMChain.Modes.WhileNeedsResponse do
@moduledoc """
Execution mode that loops while the chain needs a response.
After each LLM call, if the response contains tool calls, this mode:
1. Executes the pending tool calls
2. Calls the LLM again with the tool results
3. Repeats until `needs_response` is false (no more tool calls)
The LLM always gets the last word after tool execution.
## Usage
LLMChain.run(chain, mode: :while_needs_response)
# or
LLMChain.run(chain, mode: LangChain.Chains.LLMChain.Modes.WhileNeedsResponse)
"""
@behaviour LangChain.Chains.LLMChain.Mode
import LangChain.Chains.LLMChain.Mode.Steps
alias LangChain.Chains.LLMChain
@impl true
def run(%LLMChain{needs_response: false} = chain, _opts) do
{:ok, chain}
end
def run(%LLMChain{} = chain, opts) do
chain = ensure_mode_state(chain)
{:continue, chain}
|> execute_tools()
|> call_llm()
|> continue_or_done(&run/2, opts)
end
end