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 managedcode/dotnet-skills --skill migrate-dotnet9-to-dotnet10git clone --depth 1 https://github.com/managedcode/dotnet-skillsWrote 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/managedcode/dotnet-skills/migrate-dotnet9-to-dotnet10)<a href="https://agentmods.dev/skills/managedcode/dotnet-skills/migrate-dotnet9-to-dotnet10"><img src="https://agentmods.dev/badge/skills/managedcode/dotnet-skills/migrate-dotnet9-to-dotnet10.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 | $0.00266 | $0.04654 |
| Opus 5 | $0.00133 | $0.02327 |
| Sonnet 5 | $0.00053 | $0.00931 |
| Haiku 4.5 | $0.00027 | $0.00465 |
Grade A, and why
migrate-dotnet9-to-dotnet10 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 3d 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 migrate-dotnet9-to-dotnet10 — 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.
How it starts
The opening of the file, as written. The whole thing — 275 lines — stays where its author put it; the contents beside it link to each section on GitHub.
.NET 9 → .NET 10 Migration
Migrate a .NET 9 project or solution to .NET 10, systematically resolving all breaking changes. The outcome is a project targeting net10.0 that builds cleanly, passes tests, and accounts for every behavioral, source-incompatible, and binary-incompatible change introduced in the .NET 10 release.
When to Use
- Upgrading
TargetFrameworkfromnet9.0tonet10.0 - Resolving build errors or new warnings after updating the .NET 10 SDK
- Adapting to behavioral changes in .NET 10 runtime, ASP.NET Core 10, or EF Core 10
- Updating CI/CD pipelines, Dockerfiles, or deployment scripts for .NET 10
- Migrating from the community
System.Linq.Asyncpackage to the built-inSystem.Linq.AsyncEnumerable
When Not to Use
- The project already targets
net10.0and builds cleanly — migration is done - Upgrading from .NET 8 or earlier — use the
migrate-dotnet8-to-dotnet9skill first to reachnet9.0, then return to this skill for thenet9.0→net10.0migration - Migrating from .NET Framework — that is a separate, larger effort
- Greenfield projects that start on .NET 10 (no migration needed)
Inputs
| Input | Required | Description |
|---|---|---|
| Project or solution path | Yes | The .csproj, .sln, or .slnx entry point to migrate |
| Build command | No | How to build (e.g., dotnet build, a repo build script). Auto-detect if not provided |
| Test command | No | How to run tests (e.g., dotnet test). Auto-detect if not provided |
| Project type hints | No | Whether the project uses ASP.NET Core, EF Core, WinForms, WPF, containers, etc. Auto-detect from PackageReferences and SDK attributes if not provided |
Workflow
Answer directly from the loaded reference documents. Do not search the filesystem or fetch web pages for breaking change information — the references contain the authoritative details. Focus on identifying which breaking changes apply and providing concrete fixes. Exception: If you suspect a security vulnerability (CVE) may apply to the project's dependencies, check for published security advisories — the reference documents may not cover post-publication CVEs.
Commit strategy: Commit at each logical boundary — after updating the TFM (Step 2), after resolving build errors (Step 3), after addressing behavioral changes (Step 4), and after updating infrastructure (Step 5). This keeps each commit focused and reviewable.
What ships with it
11 files 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.
- manifest.json 162 B
- references/aspnet-core-dotnet9to10.md 6.7 KB
- references/containers-interop-dotnet9to10.md 3.0 KB
- references/core-libraries-dotnet9to10.md 4.8 KB
- references/cryptography-dotnet9to10.md 2.8 KB
- references/csharp-compiler-dotnet9to10.md 4.9 KB
- references/efcore-dotnet9to10.md 6.5 KB
- references/extensions-hosting-dotnet9to10.md 3.2 KB
- references/sdk-msbuild-dotnet9to10.md 2.4 KB
- references/serialization-networking-dotnet9to10.md 2.9 KB
- references/winforms-wpf-dotnet9to10.md 3.4 KB
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.
- 3d ago First seen · 275 lines · 266 tokens per session scan A f3f6993993ff
migrate-dotnet9-to-dotnet10 is a skill published in the GitHub repository managedcode/dotnet-skills (477 stars, last pushed yesterday), licensed MIT. It adds 266 tokens to every session and 4,654 once invoked, about $0.0013 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to migrate-dotnet9-to-dotnet10, differing in 0 lines, and is treated as a copy.
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