israeli-arnona-optimizer

A calculator and letter-writing helper for Israeli municipal property tax, called arnona. It estimates charges from the municipality, property size, zone, use, and billing period, and checks possible discounts.

In plain words
What is it for?
Use it to estimate residential, commercial, office, or industrial arnona, check discounts for eligible groups, and draft an appeal to the municipal arnona committee.
Why use it?
Arnona rates vary by location, property use, area, and eligibility, so a simple estimate can otherwise be wrong. It helps organize the facts needed for a calculation or an appeal.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/squadcodercom/squadcoder/israeli-arnona-optimizer
Any agent
npx skills add squadcodercom/squadcoder --skill israeli-arnona-optimizer
Clone the repo
git clone --depth 1 https://github.com/squadcodercom/squadcoder

Made for: Claude Code, Codex.

Per session 195 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,741 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00195 $0.03741
Opus 5 $0.00097 $0.01870
Sonnet 5 $0.00039 $0.00748
Haiku 4.5 $0.00019 $0.00374

Measured 2d ago against content hash cc2bfffab780, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

israeli-arnona-optimizer 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 2d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/arnona-calculator.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

.squadcoder/skills/israeli-arnona-optimizer/SKILL.md · 199 lines

How it starts

The opening of the file, as written. The whole thing — 199 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Israeli Arnona Optimizer

Instructions

Step 1: Gather Property Details

Before performing any arnona calculation, collect the following information from the user:

  1. Municipality (iriya): Which city or local council the property is located in (e.g., Tel Aviv-Yafo, Jerusalem, Haifa, Beer Sheva, Netanya, Rishon LeZion).
  2. Property area: Total area in square meters (sqm). Distinguish between main area and auxiliary areas (storage rooms, balconies, parking) as these are billed at different rates.
  3. Zone classification: The arnona zone within the municipality. Each city divides into zones (azor) with different rate tiers. Ask the user for their zone or help them determine it from their address.
  4. Usage type: Residential (megurim), commercial (mishari), office (misrad), industrial (taasia), or other special uses. Rates differ significantly by usage.
  5. Billing period: Arnona is billed bimonthly (every two months) in most municipalities. The annual rate is divided into 6 payment periods.

Step 2: Calculate Base Arnona

Use the arnona calculator script to compute the base annual arnona:

python scripts/arnona-calculator.py --municipality "tel-aviv" --area 80 --zone 2 --usage residential

The calculator applies the correct rate per sqm based on the municipality's published rate tables. Key rate structures:

  • Tel Aviv-Yafo: Rates range from approximately 75 to 130 NIS/sqm/year for residential depending on zone (zones 1-4). Commercial rates are 2-4x higher.
  • Jerusalem: Rates range from approximately 55 to 95 NIS/sqm/year for residential. Divided into 5 zones using Hebrew letters alef through heh (א through ה).
  • Haifa: Rates range from approximately 50 to 90 NIS/sqm/year for residential. Lower overall compared to Tel Aviv.
  • Beer Sheva: Rates range from approximately 35 to 60 NIS/sqm/year for residential. Among the lowest for major cities.

Consult references/arnona-rates-guide.md for detailed rate tables and zone classification rules.

Read the full file on GitHub · 199 lines

Files

What ships with it

8 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 2d ago First seen · 199 lines · 195 tokens per session scan A cc2bfffab780

Subscribe to this mod's changes

israeli-arnona-optimizer is a skill published in the GitHub repository squadcodercom/squadcoder (11 stars, last pushed 2mo ago), licensed MIT. It adds 195 tokens to every session and 3,741 once invoked, about $0.0010 per session on Opus 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 2026-08-30.

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