Some simple LangChain and/or LangGraph applications created while I learned them. Currently what's in apps/ is mostly a simple replication of the LangGraph tutorial, but the hardcoded messages in the original tutorial were rewritten into more flexible workflows that allow arbitrary inputs. For example, in apps\chatbot_with_human_supervision.py the user may use the "override_ai" prompt to override the AI response, or use "override_tool_call" to override the queries in the search tool call. Also, different from the tutorial which uses Claude, I used the OpenAI API. In LangChain it is just a drop-in replacement between ChatOpenAI and ChatAnthropic.

To use with your own LLM API key, create a directory ../../api_keys relative to apps/ and put there your API keys as text files, e.g. openai.txt.