alt-text SKILL.md skillA
alt-text 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/alt-text@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
alt-text/SKILL.md- Versions recorded
- 1
- Latest version
- v1.0, committed Apr 28, 2026
- Size
- 6,862 bytes
- Repository stars
- 552
- License
- MIT
Generate and improve accessible alt text for data visualizations and images in R packages and Quarto documents. Use when the user wants to add, improve, or audit alt text for figures in a pkgdown site or .qmd files. Activate for requests that mention fig-alt, fig.alt, figure descriptions, or alt text in the context of an R package or Quarto document.
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
# Write Accessible Alt Text Generate accessible alt text for data visualizations and images in this project. ARGUMENTS - label: (optional) specific figure label or chunk to target - file: (optional) specific file to process ## Detect project type Before proceeding, identify the project context and read the relevant reference. Check for a `_pkgdown.yml` file in the project root to detect a pkgdown site: ```bash ls _pkgdown.yml 2>/dev/null && echo "pkgdown" || echo "not pkgdown" ``` - **pkgdown site** (`_pkgdown.yml` present) → read `references/pkgdown.md` - **Quarto documents** (no `_pkgdown.yml`, `.qmd` files present) → read `references/quarto.md` If the context is still ambiguous, ask the user which format they are working in. ## Key advantage: source code access Unlike typical alt text scenarios where you only see an image, **we have access to the code that generates each chart**. Use this to extract precise details: **From plotting code:** - Variable mappings → exact variable names for axes - Color/fill mappings → what color encodes - Plot type functions → scatter, histogram, line chart, etc. - Trend lines or fitted curves → overlaid statistical fits …
Read the whole file at its exact version.
How to install
mdr add posit-dev/skills/alt-text@sha256:0d33621f007e3d2aThe 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_yusxtkcjo3ld5dmm)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Apr 28, 2026.
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 (6862 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 · 552 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_yusxtkcjo3ld5dmm GET https://markdownregistry.com/api/v1/resolve?ref=posit-dev/skills/alt-text GET https://markdownregistry.com/api/v1/blob/0d33621f007e3d2adae1264cf9caf93d406635a106373e4995d629066e511d37
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.
More from posit-dev/skills
Every file in posit-dev/skills