shiny-bslib-theming SKILL.md skillA
shiny-bslib-theming from posit-dev/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add posit-dev/skills/shiny-bslib-theming@v1.0Pins v1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- posit-dev/skills
- Path
shiny/shiny-bslib-theming/SKILL.md- Versions recorded
- 2
- Latest version
- v1.0, committed Feb 20, 2026
- First version recorded
- Feb 20, 2026
- Size
- 14,563 bytes
- Repository stars
- 556
- License
- MIT
Advanced theming for Shiny apps using bslib and Bootstrap 5. Use when customizing app appearance with bs_theme(), Bootswatch themes, custom colors, typography, brand.yml integration, Bootstrap Sass variables, custom Sass/CSS rules, dark mode and color modes, dynamic theme switching, real-time theming, theme inspection, or making R plots match the app theme with thematic.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Theming Shiny Apps with bslib
Customize Shiny app appearance using bslib's Bootstrap 5 theming system. From quick Bootswatch themes to advanced Sass customization and dynamic color mode switching.
## Quick Start
**"shiny" preset (recommended starting point):**
```r
page_sidebar(
theme = bs_theme(), # "shiny" preset by default — polished, not plain Bootstrap
...
)
```
**Bootswatch theme (for a different visual style):**
```r
page_sidebar(
theme = bs_theme(preset = "zephyr"), # or "cosmo", "minty", "darkly", etc.
...
)
```
**Custom colors and fonts:**
```r
page_sidebar(
theme = bs_theme(
version = 5,
bg = "#FFFFFF",
fg = "#333333",
primary = "#2c3e50",
base_font = font_google("Lato"),
heading_font = font_google("Montserrat")
),
...
)
```
**Auto-brand from `_brand.yml`:**
If a `_brand.yml` file exists in your app or project directory, `bs_theme()` automatically discovers and applies it. No code changes needed. Requires the `brand.yml` R package.
```r
bs_theme(brand = FALSE) # Disable auto-discovery
bs_theme(brand = TRUE) # Require _brand.yml (error if not found)
bs_theme(brand = "path/to/brand.yml") # Explicit path
```
…Read the whole file at its exact version.
How to install
mdr add posit-dev/skills/shiny-bslib-theming@sha256:fe5d0c93fbc4e09bThe line at the top of this page pins the label v1.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_4d7sgzhelrmgzpj7)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, all committed on Feb 20, 2026.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0 latest | 2026-02-20 | 0fabf07 | 14,563 B | A | view · diff |
| git:20260220.4b947ba | 2026-02-20 | 4b947ba | 14,482 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (14563 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
posit-dev/skills · 556 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_4d7sgzhelrmgzpj7 GET https://markdownregistry.com/api/v1/resolve?ref=posit-dev/skills/shiny-bslib-theming GET https://markdownregistry.com/api/v1/blob/fe5d0c93fbc4e09b6a46ef6f37f4e0a9007e1fd21509d3826983746a67a72565
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.