best-in-world-strategy

best-in-world-strategy is a skill for Claude Code from stevembarclay/pencilplaybook. It costs 96 tokens per session (1,463 once invoked), scanned A, original, MIT.

A decision-making guide for comparing choices, testing a plan, and assessing risk across areas such as product, security, operations, and finance.

In plain words
What is it for?
Use it when choosing between options, reviewing a plan, or making a high-stakes or difficult decision.
Why use it?
It provides a structured way to make choices with clear objectives, constraints, trade-offs, and safeguards for possible downsides.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

Good fit Use it when choosing between options, reviewing a plan, or making a high-stakes or difficult decision.

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Install with agentmods
npx agentmods add skills/stevembarclay/pencilplaybook/best-in-world-strategy
Install

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.

Any agent
npx skills add stevembarclay/pencilplaybook --skill best-in-world-strategy
Clone the repo
git clone --depth 1 https://github.com/stevembarclay/pencilplaybook

Made for: Claude Code.

Wrote 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.

agentmods badge for best-in-world-strategy

README.md
[![agentmods](https://agentmods.dev/badge/skills/stevembarclay/pencilplaybook/best-in-world-strategy/github.svg)](https://agentmods.dev/skills/stevembarclay/pencilplaybook/best-in-world-strategy)
Your own site
<a href="https://agentmods.dev/skills/stevembarclay/pencilplaybook/best-in-world-strategy"><img src="https://agentmods.dev/badge/skills/stevembarclay/pencilplaybook/best-in-world-strategy/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.

agentmods 80×15 button for best-in-world-strategy

Your own site · 80×15
<a href="https://agentmods.dev/skills/stevembarclay/pencilplaybook/best-in-world-strategy"><img src="https://agentmods.dev/badge/skills/stevembarclay/pencilplaybook/best-in-world-strategy.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 96 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,463 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00096 $0.01463
Opus 5 $0.00048 $0.00732
Sonnet 5 $0.00019 $0.00293
Haiku 4.5 $0.00010 $0.00146

Measured 12d ago against content hash d2717800ebdc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

best-in-world-strategy 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 12d 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.

.claude/skills/best-in-world-strategy/SKILL.md · 243 lines

How it starts

The opening of the file, as written. The whole thing — 243 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Best-In-World Strategy

Set an excellence baseline first. Adapt intentionally second.

Modes

Use Speed mode by default. Reserve Full mode for explicitly high-stakes or complex decisions.

  • Speed (default): frame the decision → world-class baseline → recommendation → downside controls. Rigorous but concise. No options scoring, no red-team unless the stakes clearly warrant it.
  • Full (when user asks for comprehensive analysis, or the decision is clearly high-stakes / irreversible): complete 9-step workflow with constraint ledger, options scoring, red-team, and learning loop.
  • Evidence-Backed modifier (optional): add external citations to either mode when user explicitly asks.

Switch to Risk-Acceptance Override when user states willingness to accept risk and move quickly — drops options scoring, keeps assumptions + failure modes + downside controls.

Workflow

  1. Frame the decision.
  • Write one decision sentence.
  • Capture decision type: architecture, security/risk, product, go-to-market, operations, org/talent, capital/finance.
  • Capture objective, owner, time horizon, and success metric.
  1. Build a constraint ledger.
  • Separate hard constraints from soft constraints.
  • Record budget, timeline, legal, staffing, and political constraints.
  1. Set the best-in-world baseline.
  • Identify 2-4 expert archetypes relevant to the decision.
  • For each archetype, output:
    • principle
    • expected benefit
    • cost/complexity
    • confidence
  • Mark each item as non-negotiable or adaptable.
  1. Apply first principles.
  • Separate facts, assumptions, and conventions.
  • State must-be-true conditions.
  • Isolate the smallest causal drivers.
  1. Run red-team pressure testing.
  • Ask hard skeptical questions.
  • Surface first-order and second-order failure modes.
  • Define one disconfirming test.
  1. Generate options.
  • Option A: world-class ideal.
  • Option B: pragmatic high-confidence.
  • Option C: minimum viable risk-controlled.

Read the full file on GitHub · 243 lines

Files

What ships with it

1 file 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.

Changes

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.

  1. 12d ago First seen · 243 lines · 96 tokens per session scan A d2717800ebdc

Subscribe to this mod's changes

best-in-world-strategy is a skill published in the GitHub repository stevembarclay/pencilplaybook (49 stars, last pushed 5mo ago), licensed MIT. It adds 96 tokens to every session and 1,463 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 2026-08-30.

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