mcp-host-styling-integration SKILL.md skillA
mcp-host-styling-integration from a5c-ai/babysitter is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add a5c-ai/babysitter/mcp-host-styling-integration@git:20260601.da7723aPins git:20260601.da7723a in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- a5c-ai/babysitter
- Path
library/specializations/ai-agents-conversational/skills/mcp-host-styling-integration/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260601.da7723a, committed Jun 1, 2026
- First version recorded
- Apr 4, 2026
- Size
- 10,222 bytes
- Repository stars
- 1,896
- License
- MIT
Integrates MCP App UI with host theming system. Applies host CSS variables, handles onhostcontextchanged, safe area insets, display mode detection, and fullscreen configuration.
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
# mcp-host-styling-integration Integrate MCP App UIs with the host application's theming system so apps look native in Claude Desktop, ChatGPT, VS Code, Goose, Postman, and other MCP-enabled hosts. ## Overview MCP Apps render in sandboxed iframes inside host applications. Each host has its own visual theme (colors, fonts, border radii, spacing). The MCP Apps SDK provides: - **CSS variables** (`--color-*`, `--font-*`, `--border-radius-*`) injected by the host - **SDK helpers** (`applyDocumentTheme`, `applyHostStyleVariables`, `applyHostFonts`) to apply them - **React hooks** (`useHostStyles`, `useHostStyleVariables`, `useHostFonts`) for React apps - **`onhostcontextchanged` event** fired when theme changes (e.g., dark mode toggle) The key principle is: always use CSS variable fallbacks so the app looks correct both as an MCP App (host provides variables) and standalone (fallback values apply). ## Capabilities ### Host CSS Variable Integration - Apply all host CSS variables with sensible fallback values - Support color variables: `--color-background-primary`, `--color-background-secondary`, `--color-text-primary`, `--color-text-secondary`, `--color-border-primary` …
Read the whole file at its exact version.
How to install
mdr add a5c-ai/babysitter/mcp-host-styling-integration@sha256:93004c18d8e2a709The line at the top of this page pins the label git:20260601.da7723a, 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_a6pteh7dcbzrgfmt)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Apr 4, 2026 and Jun 1, 2026, about one every 14 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260601.da7723a latest | 2026-06-01 | da7723a | 10,222 B | A | view · diff |
| git:20260507.44b06c0 | 2026-05-07 | 44b06c0 | 10,521 B | A | view · diff |
| git:20260507.50823d8 | 2026-05-07 | 50823d8 | 10,491 B | A | view · diff |
| git:20260507.313363d | 2026-05-07 | 313363d | 10,269 B | A | view · diff |
| git:20260404.bc2ce97 | 2026-04-04 | bc2ce97 | 9,925 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 (10222 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
a5c-ai/babysitter · 1,896 stars · license MIT · pushed 2026-11-01 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_a6pteh7dcbzrgfmt GET https://markdownregistry.com/api/v1/resolve?ref=a5c-ai/babysitter/mcp-host-styling-integration GET https://markdownregistry.com/api/v1/blob/93004c18d8e2a7098e17162e08be1146473075b7ad736509ea6987bfc92df4b5
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.