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# `langchain`
**Usage**:
```console
$ langchain [OPTIONS] COMMAND [ARGS]...
```
**Options**:
* `--help`: Show this message and exit.
* `-v, --version`: Print current CLI version.
**Commands**:
* `app`: Manage LangChain apps
* `serve`: Start the LangServe app, whether it's a...
* `template`: Develop installable templates.
## `langchain app`
Manage LangChain apps
**Usage**:
```console
$ langchain app [OPTIONS] COMMAND [ARGS]...
```
**Options**:
* `--help`: Show this message and exit.
**Commands**:
* `add`: Adds the specified template to the current...
* `new`: Create a new LangServe application.
* `remove`: Removes the specified package from the...
* `serve`: Starts the LangServe app.
### `langchain app add`
Adds the specified template to the current LangServe app.
e.g.:
langchain app add extraction-openai-functions
langchain app add git+ssh://git@github.com/efriis/simple-pirate.git
**Usage**:
```console
$ langchain app add [OPTIONS] [DEPENDENCIES]...
```
**Arguments**:
* `[DEPENDENCIES]...`: The dependency to add
**Options**:
* `--api-path TEXT`: API paths to add
* `--project-dir PATH`: The project directory
* `--repo TEXT`: Install templates from a specific github repo instead
* `--branch TEXT`: Install templates from a specific branch
* `--help`: Show this message and exit.
### `langchain app new`
Create a new LangServe application.
**Usage**:
```console
$ langchain app new [OPTIONS] NAME
```
**Arguments**:
* `NAME`: The name of the folder to create [required]
**Options**:
* `--package TEXT`: Packages to seed the project with
* `--help`: Show this message and exit.
### `langchain app remove`
Removes the specified package from the current LangServe app.
**Usage**:
```console
$ langchain app remove [OPTIONS] API_PATHS...
```
**Arguments**:
* `API_PATHS...`: The API paths to remove [required]
**Options**:
* `--help`: Show this message and exit.
### `langchain app serve`
Starts the LangServe app.
**Usage**:
```console
$ langchain app serve [OPTIONS]
```
**Options**:
* `--port INTEGER`: The port to run the server on
* `--host TEXT`: The host to run the server on
* `--app TEXT`: The app to run, e.g. `app.server:app`
* `--help`: Show this message and exit.
## `langchain serve`
Start the LangServe app, whether it's a template or an app.
**Usage**:
```console
$ langchain serve [OPTIONS]
```
**Options**:
* `--port INTEGER`: The port to run the server on
* `--host TEXT`: The host to run the server on
* `--help`: Show this message and exit.
## `langchain template`
Develop installable templates.
**Usage**:
```console
$ langchain template [OPTIONS] COMMAND [ARGS]...
```
**Options**:
* `--help`: Show this message and exit.
**Commands**:
* `new`: Creates a new template package.
* `serve`: Starts a demo app for this template.
### `langchain template new`
Creates a new template package.
**Usage**:
```console
$ langchain template new [OPTIONS] NAME
```
**Arguments**:
* `NAME`: The name of the folder to create [required]
**Options**:
* `--with-poetry / --no-poetry`: Don't run poetry install [default: no-poetry]
* `--help`: Show this message and exit.
### `langchain template serve`
Starts a demo app for this template.
**Usage**:
```console
$ langchain template serve [OPTIONS]
```
**Options**:
* `--port INTEGER`: The port to run the server on
* `--host TEXT`: The host to run the server on
* `--help`: Show this message and exit.
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