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 agentmods add skills/backnotprop/pstack/principle-redesign-from-first-principlesnpx skills add backnotprop/pstack --skill principle-redesign-from-first-principlesgit clone --depth 1 https://github.com/backnotprop/pstackWrote 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/backnotprop/pstack/principle-redesign-from-first-principles)<a href="https://agentmods.dev/skills/backnotprop/pstack/principle-redesign-from-first-principles"><img src="https://agentmods.dev/badge/skills/backnotprop/pstack/principle-redesign-from-first-principles.svg" alt="Measured on agentmods" 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 | $0.00043 | $0.00189 |
| Opus 5 | $0.00022 | $0.00095 |
| Sonnet 5 | $0.00009 | $0.00038 |
| Haiku 4.5 | $0.00004 | $0.00019 |
Grade A, and why
principle-redesign-from-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 5d 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.
This is a copy
100% identical to principle-redesign-from-first-principles — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
Redesign From First Principles
When integrating a change, don't bolt it onto the existing design. Redesign as if the requirement had been there from the start. The result should look like what we would have built if we'd known on day one.
- Read all affected files and understand the current design holistically
- Ask: "if we were writing this from scratch with this new requirement, what would we build?"
- Propagate the change through every reference: types, docs, examples, rationale sections
- Think about the redesign holistically, then deliver it incrementally
This is the method for preserving option value when integrating changes into an existing design.
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.
- 5d ago First seen · 17 lines · 43 tokens per session scan A 9ae97b35d633
principle-redesign-from-first-principles is a skill published in the GitHub repository backnotprop/pstack (193 stars, last pushed 16d ago), licensed MIT. It adds 43 tokens to every session and 189 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to principle-redesign-from-first-principles, differing in 0 lines, and is treated as a copy.
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