migrate-dotnet8-to-dotnet9

migrate-dotnet8-to-dotnet9 is a skill for Claude Code from F-U-S-E-E/FuseDevelopmentGroup. It costs 176 tokens per session (3,892 once invoked), scanned A, original, AGPL-3.0.

A migration guide for moving a .NET 8 project to .NET 9, including changes in C#, ASP.NET Core, and Entity Framework Core.

In plain words
What is it for?
Use it to update target frameworks and SDKs, replace incompatible APIs such as BinaryFormatter, and resolve .NET 9 migration issues.
Why use it?
It helps identify and fix build failures and behavior changes caused by the framework upgrade.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

Good fit Use it to update target frameworks and SDKs, replace incompatible APIs such as BinaryFormatter, and resolve .NET 9 migration issues.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/f-u-s-e-e/fusedevelopmentgroup/migrate-dotnet8-to-dotnet9
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 F-U-S-E-E/FuseDevelopmentGroup --skill migrate-dotnet8-to-dotnet9
Clone the repo
git clone --depth 1 https://github.com/F-U-S-E-E/FuseDevelopmentGroup

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.

agentmods badge for migrate-dotnet8-to-dotnet9

README.md
[![agentmods](https://agentmods.dev/badge/skills/f-u-s-e-e/fusedevelopmentgroup/migrate-dotnet8-to-dotnet9.svg)](https://agentmods.dev/skills/f-u-s-e-e/fusedevelopmentgroup/migrate-dotnet8-to-dotnet9)
Your own site
<a href="https://agentmods.dev/skills/f-u-s-e-e/fusedevelopmentgroup/migrate-dotnet8-to-dotnet9"><img src="https://agentmods.dev/badge/skills/f-u-s-e-e/fusedevelopmentgroup/migrate-dotnet8-to-dotnet9.svg" alt="Measured on agentmods" height="20"></a>
Per session 176 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,892 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 unknown 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00176 $0.03892
Opus 5 $0.00088 $0.01946
Sonnet 5 $0.00035 $0.00778
Haiku 4.5 $0.00018 $0.00389

Measured 4d ago against content hash 95d6de4776cc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

migrate-dotnet8-to-dotnet9 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 4d 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.

.claude/skills/migrate-dotnet8-to-dotnet9/SKILL.md · 233 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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.

  1. 4d ago First seen · 233 lines · 176 tokens per session scan A 95d6de4776cc

Subscribe to this mod's changes

migrate-dotnet8-to-dotnet9 is a skill published in the GitHub repository F-U-S-E-E/FuseDevelopmentGroup (22 stars, last pushed 14d ago), licensed AGPL-3.0. It adds 176 tokens to every session and 3,892 once invoked, 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 2026-09-03.

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