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.
npx skills add brainbytes-dev/everything-claude-finance --skill investitionsrechnunggit clone --depth 1 https://github.com/brainbytes-dev/everything-claude-financeWrote 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/brainbytes-dev/everything-claude-finance/investitionsrechnung)<a href="https://agentmods.dev/skills/brainbytes-dev/everything-claude-finance/investitionsrechnung"><img src="https://agentmods.dev/badge/skills/brainbytes-dev/everything-claude-finance/investitionsrechnung/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/brainbytes-dev/everything-claude-finance/investitionsrechnung"><img src="https://agentmods.dev/badge/skills/brainbytes-dev/everything-claude-finance/investitionsrechnung.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 | $0.00000 | $0.01965 |
| Opus 5 | $0.00000 | $0.00983 |
| Sonnet 5 | $0.00000 | $0.00393 |
| Haiku 4.5 | $0.00000 | $0.00197 |
Grade A, and why
investitionsrechnung 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 10d 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 — 189 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Investitionsrechnung
Statische und dynamische Verfahren der Investitionsrechnung — von Kostenvergleich bis vollständigem Finanzplan.
When to Activate
- Bewertung von Investitionsalternativen (Maschinen, Projekte, Akquisitionen)
- Kapitalwertberechnung (NPV) oder interner Zinsfuß (IRR)
- Amortisationsrechnung für Projekte
- Erstellung eines vollständigen Finanzplans (VoFi)
- Investitionsentscheidungen unter Unsicherheit
- Vergleich von Ersatz- oder Erweiterungsinvestitionen
- Wirtschaftlichkeitsanalyse für Business Cases
Core Concepts
Statische Verfahren (einperiodisch, Durchschnittswerte)
1. Kostenvergleichsrechnung
Durchschnittskosten = fixe Kosten + variable Kosten
fixe Kosten = kalk. Abschreibung + kalk. Zinsen + sonstige Fixkosten
kalk. Abschreibung = (Anschaffungskosten - Restwert) / Nutzungsdauer
kalk. Zinsen = (Anschaffungskosten + Restwert) / 2 x Zinssatz
Entscheidung: Alternative mit niedrigsten Durchschnittskosten. Kritische Menge berechnen, ab der Alternative B günstiger wird.
2. Gewinnvergleichsrechnung
Durchschnittsgewinn = Durchschnittserlöse - Durchschnittskosten
Entscheidung: Alternative mit höchstem Durchschnittsgewinn. Sinnvoll, wenn Alternativen unterschiedliche Erlöse generieren.
3. Rentabilitätsrechnung
Rentabilität = Durchschnittsgewinn / durchschnittlich gebundenes Kapital x 100
durchschnittlich gebundenes Kapital = (AK + Restwert) / 2
Entscheidung: Alternative mit höchster Rentabilität, sofern > Mindestverzinsung.
4. Statische Amortisationsrechnung
Amortisationszeit = Anschaffungskosten / (Durchschnittsgewinn + kalk. Abschreibung)
= Anschaffungskosten / durchschnittlicher Rückfluss
Entscheidung: Alternative mit kürzester Amortisationszeit. Risikomaß, kein Rentabilitätsmaß.
Dynamische Verfahren (mehrperiodisch, Zeitwert des Geldes)
1. Kapitalwertmethode (NPV — Net Present Value)
NPV = -I_0 + Summe(CF_t / (1+i)^t) + RW_n / (1+i)^n
- I_0 = Anfangsauszahlung
- CF_t = Cashflow in Periode t (Einzahlungen - Auszahlungen)
- i = Kalkulationszinssatz (WACC oder Opportunitätskosten)
- RW_n = Restwert am Ende der Nutzungsdauer
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.
- 10d ago First seen · 189 lines · 0 tokens per session scan A f4929e460ff3
investitionsrechnung is a skill published in the GitHub repository brainbytes-dev/everything-claude-finance (5 stars, last pushed 6mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,965 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 2026-08-31.
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