What is next-upgrade?

A workflow for upgrading Next.js, a framework for building web applications with React. It detects the current version, follows official migration guides, and runs Next.js codemods, which automatically rewrite certain outdated code patterns.

Use it to inspect package.json, determine the upgrade path, apply relevant official migration steps, and run codemods for supported changes. It covers upgrades across Next.js major versions.

It provides a version-aware path through breaking changes instead of treating an upgrade as a single package update. Codemods can automate some required code changes before manual fixes.

next-upgrade — Skill for Claude Code by agustinusnathaniel

Install

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.

Any agent

npx skills add agustinusnathaniel/nextarter-tailwind --skill next-upgrade

Clone the repo

git clone --depth 1 https://github.com/agustinusnathaniel/nextarter-tailwind

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/agustinusnathaniel/nextarter-tailwind/next-upgrade/github.svg)](https://agentmods.dev/skills/agustinusnathaniel/nextarter-tailwind/next-upgrade)

Your own site

<a href="https://agentmods.dev/skills/agustinusnathaniel/nextarter-tailwind/next-upgrade"><img src="https://agentmods.dev/badge/skills/agustinusnathaniel/nextarter-tailwind/next-upgrade/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/agustinusnathaniel/nextarter-tailwind/next-upgrade"><img src="https://agentmods.dev/badge/skills/agustinusnathaniel/nextarter-tailwind/next-upgrade.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 19 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 492 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

medium MCP Rug Pull · line 26
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

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 5.5	$0.00008	$0.00197
Sonnet 5.5	$0.00004	$0.00098
Haiku 4.5	$0.00002	$0.00049

Measured 1mo ago against content hash 562f9834d7c5, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 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.

Origin

Copies of this mod

2 near-identical copies found in the catalogue:

next-upgrade — 100% identical, 0 lines differ
next-upgrade — 100% identical, 8 lines differ

.agents/skills/next-upgrade/SKILL.md · 51 lines

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.json to 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 build to check for build errors
- Run npm run dev and test key functionality

Changes

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 · 51 lines · 19 tokens per session scan A 562f9834d7c5

Subscribe to this mod's changes

next-upgrade is a skill published in the GitHub repository agustinusnathaniel/nextarter-tailwind (125 stars, last pushed 25d ago), licensed MIT. It adds 19 tokens to every session and 492 once invoked, about $0.0001 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 2026-08-30.

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