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 human-avatar/skills-for-humanity --skill s4h-game-theory-prisoners-dilemmagit clone --depth 1 https://github.com/human-avatar/skills-for-humanityWrote 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/human-avatar/skills-for-humanity/s4h-game-theory-prisoners-dilemma)<a href="https://agentmods.dev/skills/human-avatar/skills-for-humanity/s4h-game-theory-prisoners-dilemma"><img src="https://agentmods.dev/badge/skills/human-avatar/skills-for-humanity/s4h-game-theory-prisoners-dilemma/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/human-avatar/skills-for-humanity/s4h-game-theory-prisoners-dilemma"><img src="https://agentmods.dev/badge/skills/human-avatar/skills-for-humanity/s4h-game-theory-prisoners-dilemma.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00084 | $0.01763 |
| Opus 5 | $0.00042 | $0.00881 |
| Sonnet 5 | $0.00017 | $0.00353 |
| Haiku 4.5 | $0.00008 | $0.00176 |
Grade A, and why
s4h-game-theory-prisoners-dilemma 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 9d 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 — 120 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Game Theory: Prisoner's Dilemma
The prisoner's dilemma is the central problem of cooperation. Its structure: each player has an individual incentive to defect regardless of what the other does, so both defect — and both end up worse than if they had cooperated. Individual rationality produces collective irrationality.
This structure appears everywhere: countries competing on subsidies both nations would be better without, companies in a price war that erodes margins for everyone, colleagues who each underinvest in shared infrastructure, advertisers who would all benefit if no one ran ads but each is tempted to run them. Recognising the structure is the first move; it tells you why the situation is hard and what the real leverage points are.
Robert Axelrod's computer tournaments (1984) produced one of the most important empirical results in social science: in repeated prisoners' dilemmas, Tit for Tat — cooperate first, then mirror your opponent's previous move — consistently outperformed every more complex strategy. Its winning properties: nice (cooperates first), retaliatory (immediately punishes defection), forgiving (returns to cooperation as soon as the opponent does), and clear (easy to understand and predict). The lesson: cooperation is achievable without altruism, if the game is repeated and players are patient.
Your Process
Step 1: Structure verification Confirm the three conditions that define a prisoner's dilemma:
- (a) Mutual cooperation dominates mutual defection: if both cooperate, both do better than if both defect
- (b) Defection is individually rational: each player does better defecting regardless of what the other does (defection is a dominant strategy)
- (c) The temptation to defect is real: there is a genuine payoff advantage to defecting on a cooperating partner
If all three hold: this is a genuine prisoner's dilemma. If (a) fails, cooperation isn't actually better — the analysis changes. If (b) fails, there's no defection temptation — cooperation is already individually rational.
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.
- 9d ago First seen · 120 lines · 84 tokens per session scan A aeed474d0648
s4h-game-theory-prisoners-dilemma is a skill published in the GitHub repository human-avatar/skills-for-humanity (223 stars, last pushed 1mo ago), licensed MIT. It adds 84 tokens to every session and 1,763 once invoked, about $0.0004 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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