ha-build-automation

ha-build-automation is a skill for Claude Code from gtapps/hermitd. It costs 40 tokens per session (1,158 once invoked), scanned A, original, MIT.

A Home Assistant automation builder that drafts YAML from a description and checks it against known devices and safety rules. Home Assistant is software for controlling smart-home devices.

In plain words
What is it for?
It is for creating or changing automations and scripts, including triggers, actions, helper entities, and concurrency settings.
Why use it?
It reduces manual configuration work and helps avoid references to missing devices or unsafe automation settings.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the hermitd-homeassistant plugin — 18 skills, 3 agents shipped together

Good fit It is for creating or changing automations and scripts, including triggers, actions, helper entities, and concurrency settings.

Compare 6 skills from other repositories ↓
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.

agentmods badge for ha-build-automation

README.md
[![agentmods](https://agentmods.dev/badge/skills/gtapps/hermitd/ha-build-automation/github.svg)](https://agentmods.dev/skills/gtapps/hermitd/ha-build-automation)
Your own site
<a href="https://agentmods.dev/skills/gtapps/hermitd/ha-build-automation"><img src="https://agentmods.dev/badge/skills/gtapps/hermitd/ha-build-automation/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.

agentmods 80×15 button for ha-build-automation

Your own site · 80×15
<a href="https://agentmods.dev/skills/gtapps/hermitd/ha-build-automation"><img src="https://agentmods.dev/badge/skills/gtapps/hermitd/ha-build-automation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 40 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,158 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00040 $0.01158
Opus 5.5 $0.00016 $0.00463
Sonnet 5.5 $0.00008 $0.00232
Haiku 4.5 $0.00004 $0.00116

Measured 6d ago against content hash 0cd30c0a6dcb, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ha-build-automation 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.

plugins/hermitd-homeassistant/skills/ha-build-automation/SKILL.md · 70 lines

How it starts

The opening of the file, as written. The whole thing — 70 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Build HA Automation

Steps

  1. Gather context:

    • Read .hermit/raw/snapshot-ha-normalized-latest.json for available entities and services.
    • Use the stored language from OPERATOR.md (## HA hermit section) for alias and description fields.
    • Optionally call GetLiveContext via MCP for current state.
  2. Draft the YAML:

    • Always include id: as the first field, using a stable, language-neutral snake_case value (e.g., kitchen_motion_after_sunset_notification). The validate-apply command uses this as the REST config ID — omitting it causes a derived, fragile ID that breaks on alias rename.
    • Use the stored locale for alias and description.
    • Set mode explicitly where concurrency matters.
    • Write to .hermit/raw/automation-<automation_id>.yaml.
  3. Provision missing helpers:

    • Scan the drafted YAML for helper entity IDs (input_boolean.*, input_number.*, input_text.*, input_select.*, input_datetime.*, timer.*, counter.*, schedule.*) that are absent from the entity inventory snapshot. If none are absent, skip to step 4.
    • For each distinct helper type among the absent helpers, run ${CLAUDE_PLUGIN_ROOT}/bin/ha-agent-lab ha list-helpers --type <type> once to check whether any absent helper of that type already exists under a different entity_id. If found, reference that entity instead.
    • For each helper that genuinely needs to be created, compose the JSON payload. Minimum required fields by type:
      • input_boolean / input_text: {"name": "Friendly Name"}
      • input_number: {"name": "...", "min": <N>, "max": <N>} (optional: step, initial, mode)
      • input_select: {"name": "...", "options": ["opt_a", "opt_b"]}
      • input_datetime: {"name": "...", "has_date": true, "has_time": true}
      • timer: {"name": "...", "duration": "HH:MM:SS"}
      • counter: {"name": "...", "initial": 0, "step": 1}
      • schedule: {"name": "..."} with weekday blocks — run ha list-helpers --type schedule to inspect the schema of any existing helper; if none exists, check the HA schedule integration docs for the required block format.
    • Preview the helper, then run ${CLAUDE_PLUGIN_ROOT}/bin/ha-agent-lab ha create-helper <type> '<json>' and handle the result:
      • "blocked": true; ha_safety_mode is strict; explain the boundary and create a proposal via /hermitd:proposal-create. Do not retry the denied operation. Continue to validation so the operator sees which entities are still missing.
      • "ok": true — helper created; continue.
    • If any helpers were created, run ${CLAUDE_PLUGIN_ROOT}/bin/ha-agent-lab ha refresh-context --incremental to update the snapshot before validation.

Read the full file on GitHub · 70 lines

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.

  1. 6d ago Changed · +2 lines 0cd30c0a6dcb
  2. 11d ago First seen · 68 lines · 40 tokens per session scan A 2ff8892368ff

Subscribe to this mod's changes

ha-build-automation is a skill published in the GitHub repository gtapps/hermitd (79 stars, last pushed today), licensed MIT. It adds 40 tokens to every session and 1,158 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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