FieldCure.ToolHost 0.1.8

.NET 8.0

dotnet add package FieldCure.ToolHost --version 0.1.8

NuGet\Install-Package FieldCure.ToolHost -Version 0.1.8

This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.

<PackageReference Include="FieldCure.ToolHost" Version="0.1.8" />

For projects that support PackageReference, copy this XML node into the project file to reference the package.

<PackageVersion Include="FieldCure.ToolHost" Version="0.1.8" />
                    

                            Directory.Packages.props

<PackageReference Include="FieldCure.ToolHost" />
                    

                            Project file

For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package.

paket add FieldCure.ToolHost --version 0.1.8

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

#r "nuget: FieldCure.ToolHost, 0.1.8"

#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.

#:package FieldCure.ToolHost@0.1.8

#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package.

#addin nuget:?package=FieldCure.ToolHost&version=0.1.8
                    

                            Install as a Cake Addin

#tool nuget:?package=FieldCure.ToolHost&version=0.1.8
                    

                            Install as a Cake Tool

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

FieldCure.ToolHost

Run .NET tools from NuGet without the .NET SDK — a dnx-compatible bridge library for environments where only the .NET runtime is available (MS Store apps, MSIX, runtime-only containers, CI bootstrappers).

Bridge until Microsoft ships standalone dnx (dotnet/sdk#49796).

Install

dotnet add package FieldCure.ToolHost

Quick Start

using FieldCure.ToolHost;
using System.Diagnostics;

DotnetEnvironment env = await DotnetEnvironment.DetectAsync();
DnxLiteRunner runner = new(env);

using Process tool = await runner.StartAsync(new ToolInvocationRequest
{
    PackageId = "dotnetsay",
    ToolArguments = new[] { "Hello!" },
    Policy = ToolVersionPolicy.CachedWithRefresh,
});

tool.StandardInput.Close();
Console.Write(await tool.StandardOutput.ReadToEndAsync());
await tool.WaitForExitAsync();

Environment Isolation

ToolHost matches dnx by default: launched tools inherit the current process environment, and AdditionalEnvironment is applied on top. Hosts that execute untrusted tools or stdio MCP servers can opt out:

var envVars = ToolEnvironment.GetDefaultEnvironmentVariables();
envVars["MY_TOOL_API_KEY"] = apiKey;

using Process tool = await runner.StartAsync(new ToolInvocationRequest
{
    PackageId = "My.Tool",
    ToolArguments = Array.Empty<string>(),
    InheritEnvironmentVariables = false,
    AdditionalEnvironment = envVars,
});

GetDefaultEnvironmentVariables() keeps platform basics such as PATH, home directories, temp directories, and system roots without forwarding unrelated tokens from the parent process.

Version Policy

Policy	Behavior
`AlwaysLatest`	Query NuGet every call (dnx semantics)
`CachedWithRefresh`	Use cached if within TTL (default 24h); else query
`CachedOnly`	Use cached unconditionally (offline)

Requirements

A .NET 8 or .NET 10 runtime must be installed on the host machine. ToolHost locates the dotnet muxer via PATH or DOTNET_ROOT and invokes it to launch tools — it does not ship a runtime of its own. Applications distributed to environments where users may not have a pre-installed runtime (MS Store, MSIX on fresh PCs, minimal containers) need to bundle one with the application or prompt the user to install it. The .NET SDK is not required.

Product	Compatible and additional computed target framework versions.
.NET	net8.0 is compatible. net8.0-android was computed. net8.0-browser was computed. net8.0-ios was computed. net8.0-maccatalyst was computed. net8.0-macos was computed. net8.0-tvos was computed. net8.0-windows was computed. net9.0 was computed. net9.0-android was computed. net9.0-browser was computed. net9.0-ios was computed. net9.0-maccatalyst was computed. net9.0-macos was computed. net9.0-tvos was computed. net9.0-windows was computed. net10.0 is compatible. net10.0-android was computed. net10.0-browser was computed. net10.0-ios was computed. net10.0-maccatalyst was computed. net10.0-macos was computed. net10.0-tvos was computed. net10.0-windows was computed.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version	Downloads	Last Updated
0.1.8	31	6/9/2026
0.1.7	39	6/9/2026
0.1.6	54	6/6/2026
0.1.5	119	5/23/2026
0.1.4	103	5/19/2026
0.1.3	111	5/19/2026
0.1.2	93	5/18/2026
0.1.1	86	5/18/2026
0.1.0	91	5/18/2026

v0.1.8 — Lockstep release with the fcdnx CLI (FieldCure.ToolHost.Cli v0.1.8), which now forwards stdin and bridges stdio with raw byte copies so long-lived stdio servers (e.g. MCP) stay connected. This library has no functional change; the version bump keeps the CLI and library on a single shared version line. See RELEASENOTES.ToolHost.md on GitHub for the full notes.