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docs: clarify how to get LangSmith API key (#32402)

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**Description:**
I've added a small clarification to the chatbot tutorial. The tutorial
mentions setting the `LANGSMITH_API_KEY`, but doesn't explain how a new
user can get the key from the website. This change adds a brief note to
guide them to the Settings page.

P.S. This is my first pull request, so I'm excited to learn and
contribute!

**Issue:**
N/A

**Dependencies:**
N/A

**Twitter handle:**
@sohamactive

Co-authored-by: Mason Daugherty <mason@langchain.dev>
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Soham Sharma 2025-08-12 01:22:05 +05:30 committed by GitHub
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docs/docs/tutorials/chatbot.ipynb
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@ -85,7 +85,7 @@
"As these applications get more and more complex, it becomes crucial to be able to inspect what exactly is going on inside your chain or agent.\n",
"The best way to do this is with [LangSmith](https://smith.langchain.com).\n",
"\n",
"After you sign up at the link above, make sure to set your environment variables to start logging traces:\n",
"After you sign up at the link above, **(you'll need to create an API key from the Settings -> API Keys page on the LangSmith website)**, make sure to set your environment variables to start logging traces:\n",
"\n",
"```shell\n",
"export LANGSMITH_TRACING=\"true\"\n",