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 instructions/pbnz/newton-skill/agents-mdgit clone --depth 1 https://github.com/PBNZ/newton-skillWrote 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/instructions/pbnz/newton-skill/agents-md)<a href="https://agentmods.dev/instructions/pbnz/newton-skill/agents-md"><img src="https://agentmods.dev/badge/instructions/pbnz/newton-skill/agents-md.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 | $0.00184 | $0.00184 |
| Opus 5 | $0.00092 | $0.00092 |
| Sonnet 5 | $0.00037 | $0.00037 |
| Haiku 4.5 | $0.00018 | $0.00018 |
Grade A, and why
newton-skill AGENTS.md 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.
What it actually says
Newton
Newton is a reasoning and sparring-partner posture for AI assistants. It is opt-in — it only activates when the user explicitly invokes it by name.
What it does
- Engages honestly rather than reflexively agreeing.
- Searches current authoritative sources before asserting time-sensitive claims.
- Runs a reuse-before-rebuild check before generating substantial new work.
- Makes surgical edits: every changed line must trace to the user's request.
- Flags its own uncertainty rather than confabulating.
How to activate
The user invokes Newton explicitly: Newton: …, Newton, quick: …, use Newton, invoke Newton. Do not apply Newton's posture unprompted.
Canonical definition
The full skill body lives at plugins/newton/skills/newton/SKILL.md. When a Newton invocation is recognized, load that file and follow its instructions verbatim.
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 · 20 lines · 184 tokens per session scan A df83f64a7434
newton-skill AGENTS.md is an instructions file published in the GitHub repository PBNZ/newton-skill (6 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 184 tokens to every session, about $0.0009 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 2026-08-31.
Other instructions, from other repositories
open-agent-hub AGENTS.md
AGENTS.md instructions for guanyang/open-agent-hub, covering agents.md, 1. think before coding, 2. simplicity first, 3. surgical changes and 4. goal-driven execution.
ultimate-seo-geo AGENTS.md
Instructions for mykpono/ultimate-seo-geo, covering ultimate seo + geo — llm-agnostic seo agent, 0. before you start, routing index, when not to run a full audit and audit context: internal vs. competitive.
ultimate-seo-geo copilot-instructions.md
Instructions for mykpono/ultimate-seo-geo, covering ultimate seo + geo — copilot instructions, how to use, key capabilities, quick start and reference files.
ultimate-seo-geo GEMINI.md
Instructions for mykpono/ultimate-seo-geo, covering ultimate seo + geo — gemini cli context, instructions, key commands, install dependencies first and run all individual checks.
open-agent-hub CLAUDE.md
Claude Code instructions for guanyang/open-agent-hub, covering claude.md, 1. think before coding, 2. simplicity first, 3. surgical changes and 4. goal-driven execution.
open-agent-hub GEMINI.md
Gemini CLI instructions for guanyang/open-agent-hub, covering gemini.md, 1. think before coding, 2. simplicity first, 3. surgical changes and 4. goal-driven execution.