# Cost Benefit

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- **Type:** Skill
- **Install:** `agentstack add skill-skyf0xx-better-thinking-cost-benefit`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [skyf0xx](https://agentstack.voostack.com/s/skyf0xx)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [skyf0xx](https://github.com/skyf0xx)
- **Source:** https://github.com/skyf0xx/better-thinking/tree/master/skills/cost-benefit
- **Website:** https://zenbin.org/p/better-thinking

## Install

```sh
agentstack add skill-skyf0xx-better-thinking-cost-benefit
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Cost-Benefit

Tally the full costs and benefits of an action — including opportunity cost, hidden costs, and to-whom-they-accrue — before judging it worthwhile.

## Why

Untrained tallies count visible, near-term, own-side effects and systematically miss opportunity cost, ongoing maintenance burden, and externalities — which flatters taking action over not taking it, every time.

## Use when / Don't use when

- **Use when:** justifying or challenging any investment of money, time, or attention.
- **Don't use when:** stakes are genuinely trivial, or the decision is so dominated by a single factor that a full ledger adds nothing.

## Inputs → Outputs

- **Inputs:** a proposed action.
- **Outputs:** a ledger of costs and benefits with timing, bearer, and confidence per entry, plus a net judgment flagging the dominant uncertainties.

## Principles

- The opportunity cost — the best foregone alternative — is a real cost, and it's almost always missing from the first draft of any ledger.
- Count ongoing costs (maintenance, attention, added complexity), not just the upfront acquisition cost.
- Note who bears each cost specifically — a net-positive action can still be a transfer of cost onto someone who was never consulted.
- Sunk costs are not costs, and shouldn't appear in the ledger at all.

## Procedure

1. State the action and the actual comparison baseline — usually the best alternative use of the same resources, not simply "do nothing."
2. List benefits with their timing and confidence.
3. List costs: direct, ongoing, attention/complexity, and risk-bearing.
4. Add the opportunity cost explicitly as its own line item.
5. Mark who bears each entry, and flag any asymmetries — benefits accruing to one party, costs to another.
6. Net it out, and state which one or two uncertain entries actually dominate the conclusion — that's the residual uncertainty worth resolving further.

## Common mistakes

- Using "do nothing" as the baseline when a live, better alternative actually exists.
- Ignoring the long tail of maintenance costs that follow an initial investment.
- Counting sunk costs as if they belonged in the ledger.
- Treating hard-to-quantify entries as if they were zero, rather than estimating them explicitly.

## Examples

- Whether to build an internal tool versus buying or doing without.
- Whether a recurring meeting series earns back its collective hours across attendees.
- Whether a regulation's compliance burden is proportionate to the protection it provides; whether to adopt a new dependency.

## Related

- [[expected-value]] — the probabilistic version, used when entries are genuinely uncertain rather than point estimates.
- [[second-order-scan]] — often surfaces the hidden entries this ledger would otherwise miss.
- [[prioritization-triage]] — the natural next step once several cost-benefit ledgers need to be compared against each other.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [skyf0xx](https://github.com/skyf0xx)
- **Source:** [skyf0xx/better-thinking](https://github.com/skyf0xx/better-thinking)
- **License:** MIT
- **Homepage:** https://zenbin.org/p/better-thinking

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-skyf0xx-better-thinking-cost-benefit
- Seller: https://agentstack.voostack.com/s/skyf0xx
- Browse the marketplace: https://agentstack.voostack.com/browse

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