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.
git clone --depth 1 https://github.com/Aznatkoiny/zAI-SkillsWrote 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/aznatkoiny/zai-skills/brrrr)<a href="https://agentmods.dev/commands/aznatkoiny/zai-skills/brrrr"><img src="https://agentmods.dev/badge/commands/aznatkoiny/zai-skills/brrrr.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 | $0.00017 | $0.00962 |
| Opus 5 | $0.00009 | $0.00481 |
| Sonnet 5 | $0.00003 | $0.00192 |
| Haiku 4.5 | $0.00002 | $0.00096 |
Grade A, and why
brrrr 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 4d 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.
How it starts
The opening of the file, as written. The whole thing — 146 lines — stays where its author put it; the contents beside it link to each section on GitHub.
BRRRR Strategy Calculator
Property address, or "quick" for streamlined input (may be empty): $ARGUMENTS
Instructions
When this command is invoked, analyze a BRRRR investment opportunity:
1. Load Reference Material
Read the property types reference for residential guidance:
the references/property-types.md file from the real-estate-investment skill in this plugin
2. Collect BRRRR Inputs
Use AskUserQuestion to gather:
Purchase Phase:
- Purchase price
- Purchase closing costs (default: 2-3% of price)
- Initial loan terms (if financing): down payment %, interest rate, term
Rehab Phase:
- Estimated rehab cost (itemized or total)
- Rehab timeline (months)
- Holding costs during rehab: loan payments, utilities, taxes, insurance
ARV (After Repair Value):
- After-repair value estimate (from comps)
- Source of ARV (appraisal, Zillow, agent CMA)
Rent Phase:
- Expected monthly rent after rehab
- Vacancy rate assumption (default: 8%)
- Operating expenses (% of gross rent or itemized)
Refinance Phase:
- Refinance loan-to-value (LTV) ratio (typical: 75-80% of ARV)
- Refinance interest rate and term
- Refinance closing costs (default: 2-3% of new loan)
3. Calculate Total Investment
Compute all-in cash investment:
Total Investment = Purchase Price
+ Purchase Closing Costs
+ Down Payment (if financed)
+ Rehab Cost
+ Holding Costs
- Initial Loan Amount (if applicable)
4. Validate with Rules of Thumb
Check against BRRRR rules and flag pass/fail:
70% Rule:
- Formula:
Purchase Price + Rehab ≤ 70% × ARV - Pass/Fail indicator
- Margin of safety
1% Rule:
- Formula:
Monthly Rent ≥ 1% × Total Investment - Pass/Fail indicator
- Actual percentage achieved
2% Rule (Aggressive):
- Formula:
Monthly Rent ≥ 2% × Purchase Price - Pass/Fail indicator
5. Analyze Cash Flow After Refinance
Calculate post-refinance operating performance:
- New loan amount:
ARV × Refinance LTV - Monthly debt service on new loan
- Monthly cash flow:
(Monthly Rent × (1 - Vacancy Rate)) - Operating Expenses - Debt Service - Annual cash-on-cash return on remaining equity
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.
- 4d ago First seen · 146 lines · 17 tokens per session scan A 7a9e7a279c1a
brrrr is a command published in the GitHub repository Aznatkoiny/zAI-Skills (9 stars, last pushed 1mo ago), licensed MIT. It adds 17 tokens to every session and 962 once invoked, about $0.0001 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 2026-09-03.
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