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 agentmods add skills/lemur47/logic/tconpx skills add lemur47/logic --skill tcogit clone --depth 1 https://github.com/lemur47/logicWrote 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/lemur47/logic/tco)<a href="https://agentmods.dev/skills/lemur47/logic/tco"><img src="https://agentmods.dev/badge/skills/lemur47/logic/tco.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 | $0.00000 | $0.03334 |
| Opus 5 | $0.00000 | $0.01667 |
| Sonnet 5 | $0.00000 | $0.00667 |
| Haiku 4.5 | $0.00000 | $0.00333 |
Grade A, and why
tco 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 5d 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 — 318 lines — stays where its author put it; the contents beside it link to each section on GitHub.
TCO: Total Cost of Ownership for Investment Decisions
Source: github.com/lemur47/logic
Purpose
Help users answer one question: "What will this actually cost?" using Total Cost of Ownership analysis. This skill replaces sticker-price comparisons with lifetime cost calculations that include maintenance, operations, time value of money, and residual value.
TCO is the financial foundation for PERT and EVM. PERT asks "how long will it take?" EVM asks "are we on track?" TCO asks "what's the real cost of each option?" — the question that should come first.
When to Use
- Build vs buy decisions ("should we develop in-house or use SaaS?")
- Vendor and tool comparisons where upfront prices differ wildly
- Equipment or infrastructure lifecycle planning
- Any situation where someone says "Option B is cheaper" based on sticker price alone
- Justifying a higher upfront investment that saves money over time
- PMO value cases — quantifying the cost of the status quo vs. change
Core Formulas
Simple TCO (undiscounted)
Total operational = (annual_maintenance + annual_operating_cost) × useful_life_years
Total cost = initial_price + total_operational - residual_value
Annual cost = total_cost / useful_life_years
Monthly cost = annual_cost / 12
Daily cost = annual_cost / 365
This is the baseline. It answers "how much will this cost me per year, all-in?" without adjusting for inflation or opportunity cost.
NPV-Adjusted TCO (time value of money)
NPV operational = Σ (annual_maintenance + annual_operating_cost) / (1 + discount_rate)^year
for year = 1 to useful_life_years
NPV residual = residual_value / (1 + discount_rate)^useful_life_years
NPV TCO = initial_price + NPV_operational - NPV_residual
NPV annual = NPV_TCO / useful_life_years
The discount rate accounts for the fact that money today is worth more than money tomorrow. Default: 3% (conservative, roughly tracks long-term inflation). Adjust upward for high-interest environments or when capital has a clear alternative use.
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.
- 5d ago First seen · 318 lines · 0 tokens per session scan A ba9ef9b3f14c
tco is a skill published in the GitHub repository lemur47/logic (2 stars, last pushed 2d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 3,334 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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