Home Assistant Best Practices Agent Skill

Best practices for Home Assistant automations, helpers, scripts, and dashboards.

Context cost
71.5k tokensestimated from the bundle, loaded when it triggers
Bundle
16 files · 285.8 kBtext throughout, nothing executable
Licence
MITthe author’s own terms
Last change
—v48
Servers it uses
Noneruns standalone

What it does

Home Assistant (HA) best practices. Load first, before answering or exploring, on any HA request. TRIGGER THIS SKILL WHEN: - Creating or editing automations, scripts, scenes, dashboards, blueprints - Choosing template sensors, helpers, or Jinja macros - Restructuring triggers, conditions, or modes; button, remote, or event-entity automations - Renaming entities or migrating device_id to entity_id - Looking up card types or domain docs; writing AppDaemon apps - Deleting or restoring a backup, or upgrading Core or the OS SYMPTOMS: - Jinja2 templates where native options exist - device_id used…

What this skill changes about the agent has not been set out here as a list. Its SKILL.md, shown below, says it in the author’s own words.

automationhome-assistanthouseholdsmart-home

The skill itself

A skill is instructions the model reads, so you can see what you are getting: below is the start of its SKILL.md. The front matter loads with every session, the body loads when the skill triggers, and the whole file comes with the install.

SKILL.md21.7 kB · preview
--- name: home-assistant-best-practices metadata: version: "48" ---
29# Home Assistant Best Practices
30
31**Core principle:** Use native Home Assistant constructs wherever possible. Templates bypass validation, fail silently at runtime, and make debugging opaque.
32
33**No tool reaches the HA API?** Do not stop to ask for access. If you can drive a browser on the HA web UI, make the change there, but first show the user the exact change and wait for their OK before you save: approving a click does not show them what it writes. Otherwise give the user the complete config to create in the UI (for an automation, the YAML for the editor's **Edit in YAML** mode; for a helper, its form fields), and name the entity IDs you assumed. Config that can only be written in YAML is edited with the File editor app (or in the config folder on a Container install): keep a copy of the file first, then check the configuration and run the matching reload in the **YAML** tab of **Tools** (named **Developer Tools** before 2026.8; restart if it isn't listed).
34
35**A feature marked with a release (2026.5+) depends on the instance's version.** Read it before choosing: version in GET /api/config, or **Settings → About** in the UI. On that release or later, use the feature and do not offer the older way as an equal choice. If you cannot read the version, assume a current release and name the older fallback with the version it needs.
36
37**Read the matching reference before you answer.** This page only summarizes the files in [Reference Files](#reference-files); the exact keys, fields and working examples are in them. Read every file whose row matches the task, and only those: do not load all reference files upfront.
38
39## Decision Workflow
40
41Follow this sequence when creating any automation:
42
43### 0. Gate: modifying existing config?
44
45If your change affects entity IDs, display names, or cross-component references — renaming entities or devices, replacing template sensors with helpers, converting device triggers, or restructuring automations — read [safe-refactoring](references/safe-refactoring.md) first. That reference covers impact analysis, device-sibling discovery, display-name overrides, and post-change verification. Complete its workflow before proceeding.
46
47Steps 1-5 below apply to new config or pattern evaluation.
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md2,747 words
Files16
LicenceMIT
Why you can read it

Nothing in a skill executes. The client loads the text and the model follows it, so a skill can be audited the way a runbook is — by reading it.

What it costs in context

Skills are not billed by the call. They are paid for in context: every token the instructions occupy is a token your code, your diff and your conversation cannot use. Here is what this one takes and when it takes it.

≈280
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
71,170
on trigger
The instruction body and 15 supporting files, read only when the skill fires.
35.7%
of a 200k window
Ten skills this size would not fit in the window together.
050k100k150k200k context window

71.5k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Heavy. Teams tend to install this one per project rather than globally, and load it only when the job comes up.

Servers bill, skills cost

A server charges by the month. A skill charges once per session, in context, and then keeps charging it for as long as the session lives.

Before and after

The same question, put to the same model twice: once as it comes, and once with these instructions loaded.

No worked example has been published for this skill yet.

The procedure it runs

The procedure has not been set out here step by step. It is in the body of its SKILL.md: the start of it is shown above, and the whole file comes with the install.

Prose, not code

These steps are written for a model to follow, not executed by a runtime. It can still be told to skip one, and it will say so when it does.

Servers it uses

None. This skill calls no MCP servers at all.

Everything it needs is in the instructions, so it works in a project with nothing connected — the model reads the file and changes how it works with what it can already reach.

Its SKILL.md does not declare which tools it asks the agent for, so what it touches is whatever the instructions themselves ask for — read them before you install it.

What it asks for
Writes filesnot declared
Network accessnot declared

This SKILL.md carries no allowed-tools line, so neither is declared. A skill grants no permissions of its own — it can only ask for tools your client already has.

What it will not do

Every skill is narrow, and the useful ones say where they stop. These are the jobs this one is the wrong tool for.

What this skill is not for has not been published here. Nothing is implied by that: it is a section the author has not filled in.

What is in the bundle

16 files, 285.8 kB on disk. A bundle is text throughout: the instructions the model reads, plus the templates it fills in.

  • SKILL.md21.7 kB
  • references/appdaemon.md18.4 kB
  • references/automation-actions.md19.1 kB
  • references/backups.md12.8 kB
  • references/blueprint-guide.md14.7 kB
  • references/dashboard-cards.md3.5 kB
  • references/dashboard-guide.md30.1 kB
  • references/device-control.md15.8 kB
  • references/domain-docs.md1.7 kB
  • references/examples.yaml11.6 kB
  • references/helper-selection.md51.5 kB
  • references/safe-refactoring.md18.3 kB
  • references/scenes.md3.6 kB
  • references/template-guidelines.md29.3 kB
  • references/triggers-and-conditions.md29.8 kB
  • references/yaml-only-integrations.md3.9 kB
What is not in it

No dependencies and nothing executable: a skill is text the agent reads, so the bundle is 16 files you can review in full before installing. The MIT licence covers the templates and examples as well as the instructions.

Install

Installing copies the bundle into your project. Nothing runs at install time — the files sit on disk until the model reads them.

# Home Assistant Best Practices · 71.5k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/home-assistant-best-practices/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/home-assistant-best-practices" ] && { [ ! -e .claude/skills/home-assistant-best-practices ] || { mv .claude/skills/home-assistant-best-practices "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/home-assistant-best-practices" .claude/skills/ && echo "Installed .claude/skills/home-assistant-best-practices"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add homeassistant-ai/home-assistant-best-practices

Windows PowerShell says 'running scripts is disabled on this system'? Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned once, or type npx.cmd instead of npx (codex.cmd, gemini.cmd, grok.cmd likewise). PowerShell 7 needs neither. Writes to .claude/skills/home-assistant-best-practices/ in the current project. For every project instead, run mkdir -p ~/.claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/home-assistant-best-practices/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/home-assistant-best-practices" ] && { [ ! -e ~/.claude/skills/home-assistant-best-practices ] || { mv ~/.claude/skills/home-assistant-best-practices "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/home-assistant-best-practices" ~/.claude/skills/ && echo "Installed ~/.claude/skills/home-assistant-best-practices" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/home-assistant-best-practices/ only after the download succeeds, so files left there by another skill of the same name, or by an older release, do not mix in. A copy already there is moved aside, not deleted, and the line prints where.

Which clients pick it up on their own

A skill is a folder of text. Most of these read a skills folder and pick it up without being told; the rest take the same folder another way — an upload in the app, a parameter on an API call — and then choose it by its description just the same.

Claude Code.claude/skills/
Claude DesktopCustomize › Skills
ChatGPTSkills › Create › Upload
Cursor.cursor/skills/
VS Code.github/skills/
Codex CLI.agents/skills/
Gemini CLI.gemini/skills/
Grok Build.grok/skills/
Microsoft CopilotSkills › Upload a skill
PerplexityComputer › Skills › Upload a skill
DeepSeek Harness.dsh/skills/
Zed.agents/skills/
Devin Desktop.devin/skills/
Windsurf (legacy).windsurf/skills/
OpenAI Agents SDKInstructions or sandbox Skills
HTTP / APIa request parameter
This release
Version48
Publishedno release date on file
PriceFree
Referencehomeassistant-ai/home-assistant-best-practices

Versions

v48 is what is on the shelf; no release here carries a date. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

v48
  • No earlier releases have been published to the marketplace.
Pinning

The install command always fetches the release that is current the day you run it — v48 today — and cannot ask for an earlier one. The copy on your disk does not change until you run it again.

Reviews

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Anybody with an account, one review each. It carries the version that was current when you wrote it, and the publisher may reply once.

Who wrote it

HA
homeassistant-ai

Publishes on mcprush.

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