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.
git clone --depth 1 https://github.com/product-on-purpose/thinking-framework-skillsWrote 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/commands/product-on-purpose/thinking-framework-skills/think-first-principles)<a href="https://agentmods.dev/commands/product-on-purpose/thinking-framework-skills/think-first-principles"><img src="https://agentmods.dev/badge/commands/product-on-purpose/thinking-framework-skills/think-first-principles/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/commands/product-on-purpose/thinking-framework-skills/think-first-principles"><img src="https://agentmods.dev/badge/commands/product-on-purpose/thinking-framework-skills/think-first-principles.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 | $0.00036 | $0.00345 |
| Opus 5 | $0.00018 | $0.00172 |
| Sonnet 5 | $0.00007 | $0.00069 |
| Haiku 4.5 | $0.00004 | $0.00034 |
Grade A, and why
think-first-principles 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.
What it actually says
Run the think-first-principles recipe: 2 skills chained in a fixed order, carrying forward only the compressed artifact at each handoff.
The compression is the point. Do not paste a whole artifact into the next step; carry exactly what each handoff names, so the chain stays cheaper and sharper than running the skills back to back.
First-principles thinking is not a separate skill here: its durable moves are decomposition and assumption-stripping, both of which the library already ships. This recipe chains them honestly rather than dressing the pair up as a new method.
Run the steps in order, carrying forward only the compressed artifact between them:
think-abstraction-laddering-> carry the irreducible level (the fundamentals the problem reduces to).think-assumption-reversal(on those fundamentals) -> carry which baked-in assumptions are necessary vs inherited convention.
Composite artifact: a fundamentals sheet - the irreducible truths that survive, the conventions stripped away, and a reconstruction built up from what is actually necessary. Full prose and rationale: recipes/first-principles.md.
Apply the chain to: $ARGUMENTS
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 · 22 lines · 36 tokens per session scan A 0721a1572515
think-first-principles is a command published in the GitHub repository product-on-purpose/thinking-framework-skills (15 stars, last pushed 23d ago), licensed Apache-2.0. It adds 36 tokens to every session and 345 once invoked, about $0.0002 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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