Add tutorial for evaluating LangGraph agents

[sahusiddharth]

• Fixes LangGraph Agent Evaluation Tutorial #1635

This PR adds a detailed tutorial to guide users through building a ReAct agent using LangGraph. The tutorial also walks users through setting up an evaluation pipeline using Ragas to assess the agent's performance.

[jjmachan]

Overall I think the tutorial is really good but I don't think this should be a getstarted blog - it's too specific to langgraph.

What I'm thinking is add a couple of these integration blogs to

1. langgraph
2. crewAI
3. OpenAI's swarm

ideally for the same usecase and then we'll have enough experience to build a lighter getting started tutorial that is framework agnostic

For now I think you should add this into integration/langgraph

what do you guys think?

[sahusiddharth]

Yeah, that makes sense! Adding it to the integration/langgraph section for now sounds like a good to me.

[jjmachan]

also could you add the integration to reference section: https://github.com/explodinggradients/ragas/blob/main/docs/references/integrations.md and provide a link to that in the docs

and add the integrations md file to

ragas/mkdocs.yml

Lines 90 to 92 in 895f9c0

	- Integrations:
	- howtos/integrations/index.md
	- LlamaIndex: howtos/integrations/_llamaindex.md

so that it is part of the doc site

[jjmachan]

Looks great!

I know this took a lot of back and forth but you did a great job with your fast responses 🙂 - looking forward to working with you more!

[shahules786]

Nice work, @sahusiddharth! Thanks for patiently addressing the reviews and iterating swiftly ❤️