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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/step.ex
defmodule LangChain.Chains.LLMChain.Modes.Step do
@moduledoc """
Execution mode that runs a single step at a time.
A "step" is: execute any pending tool calls, then call the LLM.
If no tools were pending, just call the LLM.
## Options
- `:should_continue?` — Function `(LLMChain.t() -> boolean())` called after
each step. If it returns `true`, another step runs. If `false` or not
provided, the mode returns after one step.
## Usage
# Single step
LLMChain.run(chain, mode: :step)
# Auto-loop with condition
LLMChain.run(chain, mode: :step,
should_continue?: fn chain ->
chain.needs_response && length(chain.exchanged_messages) < 10
end)
"""
@behaviour LangChain.Chains.LLMChain.Mode
alias LangChain.Chains.LLMChain
@impl true
def run(%LLMChain{} = chain, opts) do
should_continue_fn = Keyword.get(opts, :should_continue?)
case run_single_step(chain) do
{:ok, updated_chain} ->
if is_function(should_continue_fn, 1) && should_continue_fn.(updated_chain) do
run(updated_chain, opts)
else
{:ok, updated_chain}
end
{:error, _chain, _reason} = error ->
error
end
end
defp run_single_step(%LLMChain{} = chain) do
chain_after_tools = LLMChain.execute_tool_calls(chain)
# If no tools were executed, automatically run LLM
if chain_after_tools == chain do
LLMChain.execute_step(chain_after_tools)
else
{:ok, chain_after_tools}
end
end
end