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.
/plugin marketplace add gtapps/hermitd/plugin install hermitd-homeassistantWrote 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.
[](https://agentmods.dev/skills/gtapps/hermitd/ha-apply-update)<a href="https://agentmods.dev/skills/gtapps/hermitd/ha-apply-update"><img src="https://agentmods.dev/badge/skills/gtapps/hermitd/ha-apply-update/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.
<a href="https://agentmods.dev/skills/gtapps/hermitd/ha-apply-update"><img src="https://agentmods.dev/badge/skills/gtapps/hermitd/ha-apply-update.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00058 | $0.00684 |
| Opus 5.5 | $0.00023 | $0.00274 |
| Sonnet 5.5 | $0.00012 | $0.00137 |
| Haiku 4.5 | $0.00006 | $0.00068 |
Grade A, and why
ha-apply-update 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 11d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- ha-apply-update — 88% identical, 6 lines differ
How it starts
The opening of the file, as written. The whole thing — 31 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Apply HA Update
When this runs
Invoked from proposal-act's Accept flow for a [ha-update] proposal (originated by /hermitd-homeassistant:ha-update-check). The proposal body carries the entity_id, tier (core/os/supervisor/addon/hacs), and target version.
Steps
-
Read the flag: check
ha_update_auto_applyin.hermit/config.json.- Absent or
false: this is advisory-only. Resolve the proposal — tell the operator the update is available and where (Settings → System → Updatesin the HA UI), and stop. Do not callupdate.install. true: show the entity and target version, then continue.
- Absent or
-
Branch on tier (from the proposal body). The
addonvshacssplit is defined by the native backup capability:ha-update-checktiers an entityaddonprecisely when it advertises HA's BACKUP update feature, sobackup:trueis always valid for anaddonproposal, and ahacsentity is one that can't back itself up (hence the separate full-backup step).addon:${CLAUDE_PLUGIN_ROOT}/bin/ha-agent-lab ha call-service update.install --data '{"entity_id":"<entity_id>","backup":true}'. HA backs up the add-on natively and rolls back on install failure. Report the result to the operator once done.hacs(an individual HACS entity accepted out of an aggregated proposal; HACS entities don't support the nativebackupparameter): first${CLAUDE_PLUGIN_ROOT}/bin/ha-agent-lab ha create-backup --agent-ids <configured agent>. If the backup call is blocked or fails, stop and stay advisory; tell the operator why. Only on a successful backup:ha call-service update.install --data '{"entity_id":"<entity_id>"}'.core/os/supervisor: never auto-apply, even with the flag on. Show the tier, installed/available versions, and dashboard-access impact. Run:ha call-service update.install --data '{"entity_id":"<entity_id>","backup":true}'.
-
Report: read the command's JSON output (
ok/message). On success, tell the operator the update installed and that an audit is at.hermit/raw/audit-ha-call-service-*. On failure, surface the error verbatim and leave the proposal open rather than resolving it.
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.
- 11d ago First seen · 31 lines · 58 tokens per session scan A 23b28189359b
ha-apply-update is a skill published in the GitHub repository gtapps/hermitd (79 stars, last pushed today), licensed MIT. It adds 58 tokens to every session and 684 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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