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 fellipeutaka/leon --skill next-upgradegit clone --depth 1 https://github.com/fellipeutaka/leonWrote 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/fellipeutaka/leon/next-upgrade)<a href="https://agentmods.dev/skills/fellipeutaka/leon/next-upgrade"><img src="https://agentmods.dev/badge/skills/fellipeutaka/leon/next-upgrade.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 5.1 | $0.00019 | $0.00492 |
| Opus 5 | $0.00010 | $0.00246 |
| Sonnet 5 | $0.00004 | $0.00098 |
| Haiku 4.5 | $0.00002 | $0.00049 |
Grade A, and why
next-upgrade 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 7d 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 next-upgrade — 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
Upgrade Next.js
Upgrade the current project to the latest Next.js version following official migration guides.
Instructions
-
Detect current version: Read
package.jsonto identify the current Next.js version and related dependencies (React, React DOM, etc.) -
Fetch the latest upgrade guide: Use WebFetch to get the official upgrade documentation:
- Codemods: https://nextjs.org/docs/app/guides/upgrading/codemods
- Version-specific guides (adjust version as needed):
-
Determine upgrade path: Based on current version, identify which migration steps apply. For major version jumps, upgrade incrementally (e.g., 13 → 14 → 15).
-
Run codemods first: Next.js provides codemods to automate breaking changes:
npx @next/codemod@latest <transform> <path>Common transforms:
next-async-request-api- Updates async Request APIs (v15)next-request-geo-ip- Migrates geo/ip properties (v15)next-dynamic-access-named-export- Transforms dynamic imports (v15)
-
Update dependencies: Upgrade Next.js and peer dependencies together:
npm install next@latest react@latest react-dom@latest -
Review breaking changes: Check the upgrade guide for manual changes needed:
- API changes (e.g., async params in v15)
- Configuration changes in
next.config.js - Deprecated features being removed
-
Update TypeScript types (if applicable):
npm install @types/react@latest @types/react-dom@latest -
Test the upgrade:
- Run
npm run buildto check for build errors - Run
npm run devand test key functionality
- Run
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.
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.
- 7d ago First seen · 51 lines · 19 tokens per session scan A 562f9834d7c5
next-upgrade is a skill published in the GitHub repository fellipeutaka/leon (5 stars, last pushed 4d ago), licensed MIT. It adds 19 tokens to every session and 492 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to next-upgrade, differing in 0 lines, and is treated as a copy.
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