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 Johna2an/critical-thinking --skill v1git clone --depth 1 https://github.com/Johna2an/critical-thinkingWrote 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/johna2an/critical-thinking/v1)<a href="https://agentmods.dev/skills/johna2an/critical-thinking/v1"><img src="https://agentmods.dev/badge/skills/johna2an/critical-thinking/v1/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/johna2an/critical-thinking/v1"><img src="https://agentmods.dev/badge/skills/johna2an/critical-thinking/v1.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00250 | $0.02705 |
| Opus 5.5 | $0.00100 | $0.01082 |
| Sonnet 5.5 | $0.00050 | $0.00541 |
| Haiku 4.5 | $0.00025 | $0.00270 |
Grade A, and why
critical-thinking 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 1mo 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 — 190 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Think clearly and decide well. The first answer your mind offers is a hypothesis, not
a verdict. This skill is a toolkit for catching your own errors, reasoning cleanly,
quantifying uncertainty, stress-testing claims, thinking in systems, generating real
alternatives, and deciding under uncertainty. It carries the working tools of 21 books
on judgment. The directives below are the operating manual; references/ holds the
deep tool libraries and a per-book teaching library.
How to use this
Apply the phases that fit the task. Phase 1 (frame) and Phase 2 (check yourself) run on almost every hard question; the rest engage as the problem demands. Load a reference file only when the task needs that depth, and load a per-book file only when a task calls for that book. Read only what the task needs. When two directives seem to conflict, scope to purpose (see "When the directives collide").
Phase 1. Frame the question
- State the exact question. Pin the issue and the conclusion in plain words before reacting. Sort the issue: is it descriptive (what is) or prescriptive (what ought)? The two need different evidence.
- Catch the swap. Ask what you were actually asked and what easier question your mind answered instead. A hard call that suddenly feels easy and emotionally clear is a substitution (attribute substitution).
- Set the boundary on purpose. Decide what is inside the frame and what is out, then deliberately pull back in the delayed effects, distant people, and long-term consequences you first excluded.
Phase 2. Check yourself (bias and the scout stance)
- Ask "Is it true?" rather than "Can I believe it?" or "Must I believe it?" Notice which question you were running. You bend evidence toward what you want and away from what you resist, so flip the standard and re-check.
- Hold beliefs as probabilities and your identity lightly. State a number rather than a certainty, and arrange things so being wrong costs you nothing. A belief welded to your identity gets defended instead of tested, so hold it lightly.
- Run the selective-skeptic test. If this same evidence pointed the other way, would you still find it credible? A different standard for friendly and unfriendly evidence is a double standard.
- Hunt disconfirming evidence first. Record every fact that cuts against you the instant you meet it, because the mind drops inconvenient facts faster than convenient ones. Lean into confusion rather than explaining it away.
What ships with it
26 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.
- references/argument-and-evidence.md 30 KB
- references/biases-and-judgment.md 37 KB
- references/books/_index.md 3.6 KB
- references/books/art-of-doing-science-and-engineering.md 15 KB
- references/books/asking-the-right-questions.md 13 KB
- references/books/beginning-of-infinity.md 18 KB
- references/books/calling-bullshit.md 14 KB
- references/books/demon-haunted-world.md 13 KB
- references/books/factfulness.md 13 KB
- references/books/how-to-lie-with-statistics.md 12 KB
- references/books/how-to-read-a-book.md 11 KB
- references/books/intuition-pumps.md 13 KB
- references/books/judgment-managerial-decision-making.md 15 KB
- references/books/lateral-thinking.md 12 KB
- references/books/nonsense-on-stilts.md 14 KB
- references/books/rational-choice-uncertain-world.md 13 KB
- references/books/rulebook-for-arguments.md 15 KB
- references/books/scout-mindset.md 15 KB
- references/books/signal-and-the-noise.md 12 KB
- references/books/superforecasting.md 12 KB
- references/books/thinking-fast-and-slow.md 16 KB
- references/books/thinking-from-a-to-z.md 14 KB
- references/books/thinking-in-bets.md 14 KB
- references/books/thinking-in-systems.md 16 KB
- references/forecasting-and-decisions.md 26 KB
- references/systems-science-and-creativity.md 40 KB
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.
- 1mo ago First seen · 190 lines · 250 tokens per session scan A 9b11b5cd17d0
critical-thinking is a skill published in the GitHub repository Johna2an/critical-thinking (7 stars, last pushed 4mo ago), licensed MIT. It adds 250 tokens to every session and 2,705 once invoked, about $0.0010 per session on Opus 5.5. 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.
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