home-assistant-card

# Home Assistant Card Skill Use this skill for Home Assistant custom card development. Custom cards are Web Components; any framework that defines custom elements can work. Lit and helper libraries are optional unless the repo already uses them. This is separate from Python integrations, automations, scripts, helpers, and ordinary dashboard YAML. Use those skills unless the work changes a custom card package, registration, editor, or card usage contract. ## Start With Current Docs Fetch current markdown from the Home Assistant developers docs repository before changing card APIs. All doc paths in this skill's references are relative to this base URL — prepend it when fetching: ```text https://raw.githubusercontent.com/home-assistant/developers.home-assistant/master/docs/ ``` Use rendered pages on `developers.home-assistant.io` only as secondary reading. Fetch only relevant files, and do not copy Home Assistant docs into generated skill or repo files. Use `references/frontend-docs.md` as the docs routing index. The most important source is `frontend/custom-ui/custom-card.md`. ## Local Workflow 1. Inspect local instructions first: `AGENTS.md`, package scripts, README, HACS metadata, build config, source entrypoints, card/editor files, translations, and release notes. 2. Preserve the existing architecture and framework. Do not convert frameworks, add helper libraries, or add build tooling unless required. 3. Read the relevant reference: `references/card-workflow.md` for...