# Can you use LangSmith with a Personal Account? **URL:** \ **Category:** Observability & Evals\ **Created:** [December 15, 2025, 10:24pm UTC](https://forum.langchain.com/t/can-you-use-langsmith-with-a-personal-account/2524 "2025-12-15T22:24:11Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![fleebe](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.langchain.com/fleebe/32/1938_2.png) [@fleebe](https://forum.langchain.com/u/fleebe)\ **Post date:** [December 15, 2025, 10:24pm UTC](https://forum.langchain.com/t/can-you-use-langsmith-with-a-personal-account/2524/1 "2025-12-15T22:24:11Z")
Keep getting this error simply trying to access the list of projects. langsmith.utils.LangSmithAuthError: Authentication failed for /sessions. HTTPError(‘401 Client Error: Unauthorized for url: [https://api.smith.langchain.com/sessions?limit=100&offset=0’](https://api.smith.langchain.com/sessions?limit=100&offset=0%E2%80%99), ‘{“detail”:“UUID header value was not a valid UUID”}’) ---
**Author:** ![wfh](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.langchain.com/wfh/32/33_2.png) [@wfh](https://forum.langchain.com/u/wfh)\ **Post date:** [December 15, 2025, 10:27pm UTC](https://forum.langchain.com/t/can-you-use-langsmith-with-a-personal-account/2524/2 "2025-12-15T22:27:38Z")
Hello! Could you share an MRE for this? And to confirm - this is the output of a call you are making from the LangSmith SDK? So it is related to the observability product rather than the Deployment product? ---
**Author:** ![fleebe](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.langchain.com/fleebe/32/1938_2.png) [@fleebe](https://forum.langchain.com/u/fleebe)\ **Post date:** [December 15, 2025, 10:29pm UTC](https://forum.langchain.com/t/can-you-use-langsmith-with-a-personal-account/2524/3 "2025-12-15T22:29:53Z")
This line of code… print(_‘✅’_, len(list(client.list\_projects())), _‘projects found’_) ---
**Author:** ![wfh](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.langchain.com/wfh/32/33_2.png) [@wfh](https://forum.langchain.com/u/wfh)\ **Post date:** [December 15, 2025, 10:30pm UTC](https://forum.langchain.com/t/can-you-use-langsmith-with-a-personal-account/2524/4 "2025-12-15T22:30:19Z")
And how are you generating your api key? And thanks for confirming. So indeed this would be better filed under observability & evals. ---
**Author:** ![fleebe](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.langchain.com/fleebe/32/1938_2.png) [@fleebe](https://forum.langchain.com/u/fleebe)\ **Post date:** [December 15, 2025, 10:32pm UTC](https://forum.langchain.com/t/can-you-use-langsmith-with-a-personal-account/2524/5 "2025-12-15T22:32:41Z")
Using LangSmith client = Client(api\_key="lsv2\_sk\_ ![image](https://canada1.discourse-cdn.com/flex007/uploads/langchain/original/2X/f/ff27dc57b0808a49cc8492c6d3053f8451d7efab.png) ---
**Author:** ![wfh](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.langchain.com/wfh/32/33_2.png) [@wfh](https://forum.langchain.com/u/wfh)\ **Post date:** [December 15, 2025, 10:39pm UTC](https://forum.langchain.com/t/can-you-use-langsmith-with-a-personal-account/2524/6 "2025-12-15T22:39:26Z")
Thanks! Tagging in someone from the langsmith team ---
**Author:** ![eric-langchain](https://avatars.discourse-cdn.com/v4/letter/e/a8b319/32.png) [@eric-langchain](https://forum.langchain.com/u/eric-langchain)\ **Post date:** [December 15, 2025, 10:46pm UTC](https://forum.langchain.com/t/can-you-use-langsmith-with-a-personal-account/2524/7 "2025-12-15T22:46:11Z")
How are you setting your api key for the client? the error makes me think it may not be set correctly ---
**Author:** ![fleebe](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.langchain.com/fleebe/32/1938_2.png) [@fleebe](https://forum.langchain.com/u/fleebe)\ **Post date:** [December 15, 2025, 10:48pm UTC](https://forum.langchain.com/t/can-you-use-langsmith-with-a-personal-account/2524/8 "2025-12-15T22:48:53Z")
> [@fleebe](#): > > client = Client(api\_key="lsv2\_sk\_ In python code like this _ **from** _ langsmith _ **import** _ Client client = Client(api\_key="lsv2\_sk\_ and it is a env variable. in LANGCHAIN\_API\_KEY ---
**Author:** ![eric-langchain](https://avatars.discourse-cdn.com/v4/letter/e/a8b319/32.png) [@eric-langchain](https://forum.langchain.com/u/eric-langchain)\ **Post date:** [December 15, 2025, 11:01pm UTC](https://forum.langchain.com/t/can-you-use-langsmith-with-a-personal-account/2524/9 "2025-12-15T23:01:40Z")
> [@fleebe](#): > > len(list(client.list\_projects())) can you try making a new key? i can’t seem to repro what you’re seeing with a valid key ---
**Author:** ![fleebe](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.langchain.com/fleebe/32/1938_2.png) [@fleebe](https://forum.langchain.com/u/fleebe)\ **Post date:** [December 16, 2025, 1:44am UTC](https://forum.langchain.com/t/can-you-use-langsmith-with-a-personal-account/2524/10 "2025-12-16T01:44:04Z")
Made a new key. Here is the code. _ **from** _ langsmith _ **import** _ Client client = Client(api\_key=_“lsv2\_sk\_”_) print(_‘✅’_, len(list(client.list\_projects())), _‘projects found’_) This worked now. Created service key again for a workspace. ---
**Author:** ![fleebe](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.langchain.com/fleebe/32/1938_2.png) [@fleebe](https://forum.langchain.com/u/fleebe)\ **Post date:** [December 16, 2025, 1:53am UTC](https://forum.langchain.com/t/can-you-use-langsmith-with-a-personal-account/2524/11 "2025-12-16T01:53:58Z")
Made a new key. Here is the code. _ **from** _ langsmith _ **import** _ Client client = Client(api\_key=_“lsv2\_sk\_”_) print(_‘✅’_, len(list(client.list\_projects())), _‘projects found’_) This worked now. Created service key again for a workspace. Do not include an environment variable LANGCHAIN\_WORKSPACE\_ID=1