vellum-workspace-theme SKILL.md skillA
vellum-workspace-theme from vellum-ai/vellum-assistant is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add vellum-ai/vellum-assistant/vellum-workspace-theme@git:20260711.8eb8e35Pins git:20260711.8eb8e35 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- vellum-ai/vellum-assistant
- Path
skills/vellum-workspace-theme/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260711.8eb8e35, committed Jul 11, 2026
- First version recorded
- Jul 10, 2026
- Size
- 8,392 bytes
- Repository stars
- 1,483
- License
- MIT
Customize the app's visual theme — author design-token overrides (accent, background, surfaces, text, message-bubble colors) in the workspace ui/theme.json, validated by the assistant runtime and applied live to connected clients. Covers the token slots, the all-or-none override groups, the contrast floor, and reading back validation issues.
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
You are customizing the visual theme of the app you and your user share. The theme lives in one file — `$VELLUM_WORKSPACE_DIR/ui/theme.json` — which the assistant runtime validates and serves to every connected client. Valid changes apply **live**, layered on top of the built-in light/dark/velvet base theme: open windows re-color within a few seconds of the file being saved. No restart, no build step.
**All commands in this skill use the `bash` tool.** `$VELLUM_WORKSPACE_DIR` is available in the sandbox environment.
## Inspect current state
Always check what's there before changing it:
```bash
cat "$VELLUM_WORKSPACE_DIR/ui/theme.json" 2>/dev/null || echo "No theme yet — clients render the built-in theme"
```
## The file
A complete example (all eleven token slots — you rarely need all of them):
```json
{
"version": 1,
"tokens": {
"accent": "#e8a04c",
"background": "#1c1512",
"surface": "#2b2018",
"surfaceRaised": "#332619",
"border": "#43301f",
"text": "#f2e4d4",
"textMuted": "#a68d75",
"userBubbleBackground": "#26201a",
"userBubbleText": "#efe3d2",
"assistantBubbleBackground": "#33202a",
"assistantBubbleText": "#ffd7e4"
}
}
…Read the whole file at its exact version.
How to install
mdr add vellum-ai/vellum-assistant/vellum-workspace-theme@sha256:15292a759d05d311The line at the top of this page pins the label git:20260711.8eb8e35, 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_aittbuq7hcjkgakf)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jul 10, 2026 and Jul 11, 2026, more than one a day.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260711.8eb8e35 latest | 2026-07-11 | 8eb8e35 | 8,392 B | A | view · diff |
| git:20260710.b92d46b | 2026-07-10 | b92d46b | 7,201 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 (8392 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
vellum-ai/vellum-assistant · 1,483 stars · license MIT · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_aittbuq7hcjkgakf GET https://markdownregistry.com/api/v1/resolve?ref=vellum-ai/vellum-assistant/vellum-workspace-theme GET https://markdownregistry.com/api/v1/blob/15292a759d05d3110d4b60b64e0b93c48731e836d01b4eae85ac2f7281673ced
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.