Borrowing it
Nothing to install: this file belongs to NaanyaBiz/haggle. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/NaanyaBiz/haggle/main/.claude/commands/hassfest.mdgit clone --depth 1 https://github.com/NaanyaBiz/haggleWrote 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/commands/naanyabiz/haggle/hassfest)<a href="https://agentmods.dev/commands/naanyabiz/haggle/hassfest"><img src="https://agentmods.dev/badge/commands/naanyabiz/haggle/hassfest.svg" alt="Measured on agentmods" 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 | $0.00000 | $0.00304 |
| Opus 5 | $0.00000 | $0.00152 |
| Sonnet 5 | $0.00000 | $0.00061 |
| Haiku 4.5 | $0.00000 | $0.00030 |
Grade A, and why
hassfest scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
/hassfest
Validate the integration against Home Assistant's hassfest rules.
What this does
hassfest is the Home Assistant tool that validates custom integrations. It runs in CI via the official home-assistant/actions/hassfest@master GitHub Action. There are two ways to run it locally:
Option 1: Docker (recommended for ad-hoc checks)
docker run --rm \
-v "$(pwd)/custom_components:/github/workspace/custom_components:ro" \
ghcr.io/home-assistant/home-assistant:dev \
python -m script.hassfest --action validate \
--integration-path /github/workspace/custom_components/haggle
Option 2: Check CI instead
gh run list --branch $(git rev-parse --abbrev-ref HEAD) --workflow hassfest.yml --limit 5
Then follow the link to the failing check for details.
Common hassfest failures
manifest.jsonmissing a required field (check docs at developers.home-assistant.io)strings.jsonkeys not matchingtranslations/en.jsonconfig_flowkey true but noconfig_flow.pyclass- Version not semver
codeownersnot a list of GitHub handles starting with@
When to run
Run after any change to manifest.json, strings.json, translations/en.json, or config_flow.py.
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.
- 3d ago First seen · 38 lines · 0 tokens per session scan A baad7dec6438
hassfest is a command published in the GitHub repository NaanyaBiz/haggle (13 stars, last pushed 5d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 304 tokens. 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 2026-09-04.
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gf-cocotb
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checklist
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