What is next-upgrade?

A guide for upgrading a Next.js application, a web framework for React. It checks the current version, follows the official migration guidance, and uses available codemods to update breaking APIs where appropriate.

Use it to inspect Next.js and related dependency versions, plan major-version upgrades, run migration codemods, and apply the relevant official upgrade steps.

It provides a version-aware upgrade path and highlights changes that may break an application. Codemods can automate some repetitive code updates before testing.

next-upgrade — Skill for Claude Code by figueroaignacio

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 figueroaignacio/ignaciofigueroa.dev --skill next-upgrade

Clone the repo

git clone --depth 1 https://github.com/figueroaignacio/ignaciofigueroa.dev

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/figueroaignacio/ignaciofigueroa.dev/next-upgrade/github.svg)](https://agentmods.dev/skills/figueroaignacio/ignaciofigueroa.dev/next-upgrade)

Your own site

<a href="https://agentmods.dev/skills/figueroaignacio/ignaciofigueroa.dev/next-upgrade"><img src="https://agentmods.dev/badge/skills/figueroaignacio/ignaciofigueroa.dev/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/figueroaignacio/ignaciofigueroa.dev/next-upgrade"><img src="https://agentmods.dev/badge/skills/figueroaignacio/ignaciofigueroa.dev/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 493 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.

Origin 100% copy Near-identical to another mod 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	$0.00493
Opus 5	$0.00010	$0.00246
Sonnet 5	$0.00004	$0.00099
Haiku 4.5	$0.00002	$0.00049

Measured 10d ago against content hash ae9cc6f801d0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, 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 10d 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

This is a copy

100% identical to next-upgrade — 8 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.

.agents/skills/next-upgrade/SKILL.md · 55 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.

10d ago First seen · 55 lines · 19 tokens per session scan A ae9cc6f801d0

Subscribe to this mod's changes

next-upgrade is a skill published in the GitHub repository figueroaignacio/ignaciofigueroa.dev (5 stars, last pushed 6d ago), licensed MIT. It adds 19 tokens to every session and 493 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 8 lines, and is treated as a copy.

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