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Cannot add custom templates with langchain add langchain app add --project-dir #102

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opened 2026-02-16 00:18:47 -05:00 by yindo · 7 comments
yindo commented 2026-02-16 00:18:47 -05:00
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Originally created by @LifeHackerBee on GitHub (Jan 24, 2024).

I created a langchain app template by using:

langchain template new hello-world

However, when I executed langchain app add --pip --project-dir ./templates/hello-world, it returned as following:

No packages installed. Exiting.

as the docs instructed:

langchain cli

  • add Adds the specified template to the current LangServe app.
  • --project-dir PATH The project directory [default: None]

Please kindly let me know how to resolve this issue, thanks in advance.

Best,
Levon

Originally created by @LifeHackerBee on GitHub (Jan 24, 2024). I created a langchain app template by using: ``` langchain template new hello-world ``` However, when I executed `langchain app add --pip --project-dir ./templates/hello-world`, it returned as following: ``` No packages installed. Exiting. ``` as the docs instructed: **langchain cli** - add Adds the specified template to the current LangServe app. - --project-dir PATH The project directory [default: None] Please kindly let me know how to resolve this issue, thanks in advance. Best, Levon
yindo closed this issue 2026-02-16 00:18:47 -05:00
yindo commented 2026-02-16 00:18:48 -05:00
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@alexnodeland commented on GitHub (Jan 25, 2024):

I'm getting the same issue here @shellsniper

Any feedback on this from the Langchain team?

@alexnodeland commented on GitHub (Jan 25, 2024): I'm getting the same issue here @shellsniper Any feedback on this from the Langchain team?
yindo commented 2026-02-16 00:18:48 -05:00
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@eyurtsev commented on GitHub (Jan 25, 2024):

cc @efriis

@eyurtsev commented on GitHub (Jan 25, 2024): cc @efriis
yindo commented 2026-02-16 00:18:48 -05:00
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@eyurtsev commented on GitHub (Jan 25, 2024):

Could you include versions of langchain, langchain-cli and langchain core? @alexnodeland / @shellsniper

@eyurtsev commented on GitHub (Jan 25, 2024): Could you include versions of langchain, langchain-cli and langchain core? @alexnodeland / @shellsniper
yindo commented 2026-02-16 00:18:48 -05:00
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@alexnodeland commented on GitHub (Jan 25, 2024):

Surely, here are all Langchain related packages' versions @eyurtsev

langchain==0.1.3
langchain-cli==0.0.21
langchain-community==0.0.16
langchain-core==0.1.16
langserve==0.0.39
langsmith==0.0.83
@alexnodeland commented on GitHub (Jan 25, 2024): Surely, here are all `Langchain` related packages' versions @eyurtsev ``` langchain==0.1.3 langchain-cli==0.0.21 langchain-community==0.0.16 langchain-core==0.1.16 langserve==0.0.39 langsmith==0.0.83 ```
yindo commented 2026-02-16 00:18:48 -05:00
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@efriis commented on GitHub (Jan 28, 2024):

Hey there! You should create a new app with langchain app new hello-world. The template namespace is for people developing new templates, not adding existing ones :)

Let me know if you have any more issues!

@efriis commented on GitHub (Jan 28, 2024): Hey there! You should create a new app with `langchain app new hello-world`. The `template` namespace is for people developing new templates, not adding existing ones :) Let me know if you have any more issues!
yindo commented 2026-02-16 00:18:48 -05:00
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@alexnodeland commented on GitHub (Jan 29, 2024):

Hey @efriis, thanks for the note. I used langchain app new hello-world to instantiate the project, and want to add a custom template, in order to develop a new template, which I will use internally. Is this not the intended pattern of use? Or should I only clone templates and modify them?

I found that I can create a new template, but cannot add it to the project, as @shellsniper had pointed out. That being said, I can add it to the project with poetry manually via: poetry add -e packages/{TEMPLATE_NAME} and then rerunning poetry install. After I do this, I can use the template as expected. I suppose that this is the same intended effect as running, langchain app add --pip --project-dir ./packages/{TEMPLATE_NAME}?

@alexnodeland commented on GitHub (Jan 29, 2024): Hey @efriis, thanks for the note. I used `langchain app new hello-world` to instantiate the project, and want to add a custom template, in order to develop a new template, which I will use internally. Is this not the intended pattern of use? Or should I only clone templates and modify them? I found that I can create a new template, but cannot add it to the project, as @shellsniper had pointed out. That being said, I can add it to the project with poetry manually via: `poetry add -e packages/{TEMPLATE_NAME}` and then rerunning `poetry install`. After I do this, I can use the template as expected. I suppose that this is the same intended effect as running, `langchain app add --pip --project-dir ./packages/{TEMPLATE_NAME}`?
yindo commented 2026-02-16 00:18:49 -05:00
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@efriis commented on GitHub (Feb 1, 2024):

Ah great case! Will add to my todo list to support those file paths better.

In the meantime, feel free to keep using your current flow. If I'm not planning on publishing templates, I often also just create files in app/ that I import into server.py. You can see how I did it in the Exa demo here: https://www.youtube.com/watch?v=dA1cHGACXCo

@efriis commented on GitHub (Feb 1, 2024): Ah great case! Will add to my todo list to support those file paths better. In the meantime, feel free to keep using your current flow. If I'm not planning on publishing templates, I often also just create files in `app/` that I import into `server.py`. You can see how I did it in the Exa demo here: https://www.youtube.com/watch?v=dA1cHGACXCo
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Reference: langchain-ai/langserve#102
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