Document that C# script steps require the .NET SDK - #3333
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August 11, 2026 02:12
C# scripts (.csx) run through dotnet-script, which always shells out to `dotnet restore` -- even for a script with no NuGet references -- so the machine running the step needs the .NET SDK, not just the runtime. This has been true since the scriptcs to dotnet-script migration, but was only ever stated in a 2021 blog post that is now stale on the version. A runtime-only target fails with "Unable to restore packages from '.../script.csproj' / Make sure that all script files contains valid NuGet references", which points people at their NuGet references rather than the missing SDK. The docs now quote that message so a search for it lands here. - custom-scripts/index.md: new "C# script requirements" section - linux/ssh-requirements.md: its ".NET" section said the opposite, which is true for self-contained Calamari but not for C# scripts - system-variables.md: only one NuGet source can be supplied via Octopus.Action.Script.CSharp.NuGetSource, and it replaces the default No SDK version is named. dotnet-script derives the generated project's target framework from whichever runtime the `dotnet` on the path resolves, so the requirement is relative to that runtime. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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C# scripts (
.csx) run through dotnet-script, which always shells out todotnet restore— even for a script with no NuGet references — so the machine running the step needs the .NET SDK, not just the runtime. That machine is a deployment target, a worker, or the Octopus Server.This has been true since the scriptcs → dotnet-script migration, but was only ever stated in a 2021 blog post that is now stale on the version. A runtime-only target fails with:
which points people at their NuGet references rather than the missing SDK. The docs now quote that message so a search for it lands here.
Changes
deployments/custom-scripts/index.md— new "C# script requirements" sectioninfrastructure/deployment-targets/linux/ssh-requirements.md— its.NETsection said the opposite, which is true for self-contained Calamari but not for C# scriptsprojects/variables/system-variables.md— only one NuGet source can be supplied viaOctopus.Action.Script.CSharp.NuGetSource, and it replaces the default rather than adding to itNo SDK version is named. dotnet-script derives the generated project's target framework from whichever runtime the
dotneton the path resolves, so the requirement is relative to that runtime rather than a number that would go stale the way the blog post'snet6.0did.Docs only.
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