# Docs by LangChain: AGENT DEVELOPMENT LIFECYCLE Build

> Documentation for LangSmith, Fleet, and our open source packages.

## Build

- [AGENT DEVELOPMENT LIFECYCLE / Build / Python (229 pages)](https://docs.langchain.com/_llms/agent-development-lifecycle/build/python.txt): Documentation for AGENT DEVELOPMENT LIFECYCLE / Build / Python.
- [AGENT DEVELOPMENT LIFECYCLE / Build / TypeScript (235 pages)](https://docs.langchain.com/_llms/agent-development-lifecycle/build/type-script.txt): Documentation for AGENT DEVELOPMENT LIFECYCLE / Build / TypeScript.