assistant-ui

An original documentation routing skill plus the official assistant-ui hosted MCP. It helps with setup, components, runtimes, tools, streaming, persistence, and upgrades while following the project's existing choices.

Use

Install from Myles Codex Plugins:

codex plugin add assistant-ui@mcook-plugins-local

Start a new chat, then try:

"Use $assistant-ui to explain the runtime options for my existing backend."
"Debug why this @assistant-ui thread stops updating."
"Find the official migration guide for the versions in this lockfile."

The package contains one skill, assistant-ui. Upstream /setup, /runtime, and other skills are read directly from GitHub as needed, not copied into the package or registered as additional commands. Each new task checks the current upstream index and reads the relevant guide and supporting references, using one commit where possible. Upstream content updates need no plugin release or scheduled sync. This requires network access; if GitHub is unavailable, the skill falls back to official documentation and reports the gap. There are no hooks, automatic installers, or application dependencies.

Sources and connection

mcp.json connects directly to https://www.assistant-ui.com/mcp using Streamable HTTP. No local MCP process or API key is configured. The service requires network access and is operated by assistant-ui. If unavailable, the skill uses the documentation index and individual .md pages through an available web tool.

The remote service provides documentation, examples, and template discovery; its preview_template tool creates a hosted preview. The skill requires that remote action to be authorized and excludes secrets and private project data from queries and previews. Merely installing this package does not create a preview or an Assistant Cloud account.

Portable Agent Plugins 1.0.0 packaging includes an OpenAI compatibility manifest. The Claude catalog supplies its equivalent HTTP MCP configuration. MCP protocol target: current/legacy compatibility; the observed handshake uses 2025-03-26. This is not a claim of MCP 2026-07-28 conformance.

Provenance and validation

This is a Myles Cook integration, not an official assistant-ui plugin. The skill is original; it links to upstream content without redistributing the upstream skills. The assistant-ui/skills README and Claude plugin manifest declare MIT (checked 2026-10-09), although GitHub's repository license metadata is empty. The main assistant-ui/assistant-ui repository also declares MIT. Linked material remains subject to its own license.

See verification for checks and limitations.