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 sananthanarayan/skilldrop --skill business-casegit clone --depth 1 https://github.com/sananthanarayan/skilldropWrote 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/sananthanarayan/skilldrop/business-case)<a href="https://agentmods.dev/skills/sananthanarayan/skilldrop/business-case"><img src="https://agentmods.dev/badge/skills/sananthanarayan/skilldrop/business-case.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 | $0.00091 | $0.01608 |
| Opus 5 | $0.00046 | $0.00804 |
| Sonnet 5 | $0.00018 | $0.00322 |
| Haiku 4.5 | $0.00009 | $0.00161 |
Grade A, and why
business-case 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 7d 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 — 65 lines — stays where its author put it; the contents beside it link to each section on GitHub.
business-case
Produces the document a sponsor can approve, challenge, or kill on its merits — because every benefit shows its arithmetic, every option includes the one nobody advocates for (doing nothing), and the case names the single assumption that flips the recommendation. Decides whether to invest; tech-comparison-matrix picks between technologies after, prd-draft captures requirements after, exec-summary compresses this doc for a board.
How to respond
-
Pin the decision and the decider. What exactly is being decided ("invest ~3 engineer-quarters in X" — not "improve our tooling"), who decides, and by when. Ask at most 2 questions, spent on the cost of the status quo ("what does the current state cost per month, in what units?") and the decision deadline. A business case without a named decision is an essay.
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Always include Option 0: do nothing. Costed like every other option — the status quo has a price (ongoing pain, growing risk, deferred opportunity) and the case must beat it explicitly, not by assumption. Then 2–3 real alternatives (typically build / buy / partial-defer). Every option presented is one someone could genuinely champion; a lineup of two strawmen escorting the preferred option is theater, and reviewers smell it.
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Quantify benefits as calculations a reviewer can re-run. Every benefit shows: the formula, each input with its source tag, and a confidence tag (high = measured data, medium = reasonable extrapolation, low = informed guess). ✅ "40 agents × ~20 min/ticket saved
[data: time study]× 30 tickets/day → 18–24 FTE-hours/day, confidence: medium (assumes 75–100% of tickets touch the flow)" — ❌ "significant efficiency gains" — an adjective benefit is a benefit that didn't survive arithmetic. -
Use ranges, never false precision. Three estimates multiplied together do not produce "327% ROI" — they produce a range, and the case says which end is likelier and why. State payback as a range too ("breakeven month 7–11"). Single-point outputs from multi-guess inputs are the most reliable sign a case is selling, not informing.
What ships with it
3 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.
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.
- 7d ago First seen · 65 lines · 91 tokens per session scan A e6d2178d74ce
business-case is a skill published in the GitHub repository sananthanarayan/skilldrop (2 stars, last pushed 24d ago), licensed MIT. It adds 91 tokens to every session and 1,608 once invoked, about $0.0005 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 2026-08-31.
Other skills, from other repositories
readme
This skill should be used to audit OR elevate the README of a public repository. Trigger with "improve the README", "make the readme high quality", "elevate this readme", "audit the readme", "add badges", "is our README good", or before publishing/releasing a repo. Elevate rebuilds a thin/generic README to a polished…
cairn-attention
Resolve Cairn's pending-attention queue inline (DEC drafts, baseline findings, drift events).
cairn-direction
Spec-tightener + subagent dispatcher. Engage on code-change asks — verbs, bug reports, observations. Pivot-aware on active tasks.
cairn-resync
Operator-initiated re-discovery — resolve config drift, re-cluster topics, re-curate grown areas into DEC/INV drafts.
ship
Execute an approved pitch/spec as a delegated, closed-scope cycle with verification and adversarial review. Invoke it yourself with /ship — a cycle spawns a writer and opens a PR, so it starts when you say so. Enforces the execution playbook: right-size gate, pre-spawn filter, doc-bundle, PR format, review.
adr-new
Create a new Architecture Decision Record with append-only, status-gated supersession, and update the ADR index. Invoke with /adr-new, or let /tdd-author invoke it on approval of an ADR action (this skill stays model-invocable for that reason).