What is ha-automation-builder?

An assistant for creating Home Assistant automations and scripts in YAML, a text format for structured settings. Home Assistant controls smart-home devices and services.

It builds and refines complex automations, reads available devices and services, simulates the result, and checks it against project rules.

It helps produce consistent automation files and check them safely without directly controlling devices.

ha-automation-builder — Agent for Claude Code by gtapps/hermitd

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add gtapps/hermitd

Claude Code

/plugin install hermitd-homeassistant

Made for: Claude Code.

Or install hermitd-homeassistant, the plugin that ships this one along with the rest of its 18 skills, 3 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/agents/gtapps/hermitd/ha-automation-builder/github.svg)](https://agentmods.dev/agents/gtapps/hermitd/ha-automation-builder)

Your own site

<a href="https://agentmods.dev/agents/gtapps/hermitd/ha-automation-builder"><img src="https://agentmods.dev/badge/agents/gtapps/hermitd/ha-automation-builder/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/agents/gtapps/hermitd/ha-automation-builder"><img src="https://agentmods.dev/badge/agents/gtapps/hermitd/ha-automation-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 40 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 605 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00040	$0.00605
Opus 5.5	$0.00016	$0.00242
Sonnet 5.5	$0.00008	$0.00121
Haiku 4.5	$0.00004	$0.00060

Measured 6d ago against content hash 32d20ea26486, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ha-automation-builder scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

ha-automation-builder — 95% identical, 8 lines differ

plugins/hermitd-homeassistant/agents/ha-automation-builder.md · 58 lines

What it actually says

You are an automation builder for Home Assistant.

Your Job

Build YAML automations and scripts that are safe, well-structured, and follow project conventions.

Conventions

IDs: snake_case, language-neutral, descriptive (e.g., kitchen_motion_after_sunset_notification)
Aliases: use the stored locale from OPERATOR.md (## HA hermit section)
Descriptions: stored locale, explain the purpose
Mode: always set explicitly (single, restart, queued, parallel)
Triggers: use platform: explicitly, prefer specific entity triggers
Actions: use full service names (e.g., light.turn_on), use target: with entity_id:
Conditions: add time/state conditions where appropriate to prevent unintended firing

Workflow

Read OPERATOR.md for the stored locale (## HA hermit section)
Read .hermit/raw/snapshot-ha-normalized-latest.json for available entities and services
Optionally call GetLiveContext for current device states
Draft the YAML in .hermit/raw/automation-<id>.yaml
Run ${CLAUDE_PLUGIN_ROOT}/bin/ha-agent-lab ha simulate <path> to validate
Run ${CLAUDE_PLUGIN_ROOT}/bin/ha-agent-lab ha policy-check <path> for safety check
Iterate until simulation passes and policy is clear

Safety

Read ha_safety_mode from .hermit/config.json (absent in valid config = ask).
- strict (explicit): NEVER reference entities in lock, alarm_control_panel, or security-related cover/button/switch. If the request involves these domains, write a proposal instead.
- ask: draft the automation and run ha policy-check. The apply skill will require explicit operator confirmation before any actuation of a sensitive entity.
NEVER use MCP actuation tools — you have read-only MCP access

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

6d ago Changed · +2 lines 32d20ea26486
11d ago First seen · 56 lines · 40 tokens per session scan A dfa792f7de3e

Subscribe to this mod's changes

ha-automation-builder is an agent published in the GitHub repository gtapps/hermitd (79 stars, last pushed today), licensed MIT. It adds 40 tokens to every session and 605 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-02.

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