Using _ricochet.toml

Each deployment to ricochet is accompanied by a _ricochet.toml file. The _ricochet.toml file is used to set and keep track of metadata about your content item.

[content]
name = "Ambiorix API"
entrypoint = "app.R"
access_type = "external"
content_type = "ambiorix"
id = "01JSSAQA559K7AS1M1X3WCJFV5"

[language]
name = "r"
packages = "renv.lock"

[serve]
min_instances = 0
max_instances = 5
spawn_threshold = 80
max_connections = 10

A _ricochet.toml has two required sections

• content
• language

and the following optional settings (depending on the content type):

• schedule
• serve
• static

content settings

The [content] section of the _ricochet.toml is required. It has the following required fields:

Field	Description
name	The display name of your content item.
entrypoint	The file that starts your content item for example "app.R".
access_type	Determines the visibility of the content item. It must be one of private, internal, or external. Defaults to private.
content_type	Specifies the content type to be deployed. See Content Items Overview for the full list. Valid values: "r", "rmd", "plumber", "ambiorix", "shiny" / "shiny-r", "rmd-shiny", "r-service", "serverless-r", "quarto-r", "quarto-r-shiny", "julia", "julia-service", "quarto-jl", "python", "python-service", "quarto-py", "fast-api", "flask", "streamlit", "dash", "shiny-py".
slug	A unique suffix to view your content item from. It must contain only numbers, letters, or the characters - or _. For example slug: "my-shiny-app" will be accessible via https://<domain>/my-shiny-app
summary	A text summary for the content item. This is visible under the content item’s card.
thumbnail	The relative path to an image to use as a thumbnail. Must be a png, jpg, or gif and 5mb or smaller.
tags	An array of tags to be associated with the content item.

Upon your first successful deployment, a unique content ID is created. The content ID is tracked in the id field.

static settings

Some items such as R Markdown or Quarto may create static html websites. The [static] content settings can be used to specify which directory should be served from your content item.

Field	Description
output_dir	The directory to serve.
index	The file to server from ouput_dir. Default of index.html.

Example

[static]
index = "index.html"
output_dir = "_site"

serve settings

Content items that require a running background process such as Shiny, Plumber, FastAPI, Flask, Streamlit, or Dash are considered services. Use the [serve] settings to determine how the content scales.

The following settings can be set:

Field	Description
min_instances	The minimum number instances to always be available for a service.
max_instances	The maximum number of instances that a content item can spawn.
spawn_threshold	The percent of the number of active connections divided by the maxinum number of instances. When this number is reached, a new instance is spawned.
max_connections	This is the maximum number of connections that a single service can handle. When this number is reached, a new instance is spawned. However, if max_instances is reached an all instances are at max_connections, then this field is ignored.
max_connection_age	The maximum age (in seconds) of a connection before it is closed. If not set, instances will be terminated when there are no more connections to instance.

Example

[serve]
min_instances = 0
max_instances = 5
spawn_threshold = 80
max_connections = 10

language settings

The language section of the _ricochet.toml is required. It contains two fields: name and packages. These specify which language the content item is using as well as how the dependencies are specified.

Field	Description
name	The language of the content item. Must be "r", "julia", or "python".
packages	For "r" must be "renv.lock". For "julia" must be "Manifest.toml". For "python" must be "uv.lock". No other dependency management tools are supported at the moment.

repositories settings

The optional [repositories] section lets you override the default package repository sources for your content item. This is useful when your packages are hosted on a private registry or a specific mirror.

Note

Item-level repository overrides are enabled by default. A server administrator can disable them by setting allow_overrides = false in the server configuration. See the admin package repositories guide for details on precedence rules.

R

R repositories are specified as a table of named URLs. Keys must consist of uppercase letters and underscores only.

[repositories]
r = { CRAN = "https://cran.rpkgs.com", RSPM = "https://p3m.dev/cran/__linux__/noble/latest" }

R package repositories can also be configured in the ricochet web UI under the Runtime tab for each content item. Python and Julia package sources are TOML-only at present.

Python

Python index sources are specified as an array of URLs. Order matters — earlier entries take priority.

[repositories]
python = ["https://my-private-index.example.com", "https://pypi.org"]

Julia

Coming Soon

Custom Julia package sources are not yet supported.

schedule settings

All tasks items can be scheduled by specifying the cron field.

[schedule]
cron = "0 0 * * *"