ModelLanguage 1.1.0

.NET 8.0 This package targets .NET 8.0. The package is compatible with this framework or higher. 
dotnet add package ModelLanguage --version 1.1.0
                    


                    

                
NuGet\Install-Package ModelLanguage -Version 1.1.0
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="ModelLanguage" Version="1.1.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="ModelLanguage" Version="1.1.0" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="ModelLanguage" />
                    


                            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 ModelLanguage --version 1.1.0
                    


                    

                
#r "nuget: ModelLanguage, 1.1.0"
#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 ModelLanguage@1.1.0
#: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=ModelLanguage&version=1.1.0
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=ModelLanguage&version=1.1.0
                    


                            Install as a Cake Tool

ModelLanguage (C#)

.NET bindings for model-language — a typed, safe template language for AI-agent prompts. Runs the exact same engine as the JavaScript/TypeScript package via an embedded WebAssembly module: byte-for-byte identical output, guaranteed by a shared conformance suite.

▶ Live demo — try the language in a Tiptap editor (live validation, autocomplete, real-time render), powered by the same engine.

Filters format values — dates, numbers, text:

{{ user.created_at | date: "MMM D, YYYY" }}            →  Jul 5, 2026
{{ user.created_at | date: "h:mm A", "Europe/Kyiv" }}  →  5:37 PM
{{ user.last_seen  | time_ago }}                       →  3 days ago

using ModelLanguage;
using System.Text.Json.Nodes;

using var engine = new Engine();
var data = JsonNode.Parse("""{ "user": { "name": "Vasyl" } }""");
var res = engine.Render("Hi {{ user.name | default: \"there\" }}!", data);
Console.WriteLine(res["text"]); // Hi Vasyl!

Directives embed machine-readable constraints in a prompt. They are stripped from the rendered text and returned in directives:

var src = """
    Help with billing.
    {{verify_before: payments}}
    {{identity: contact.email == payment.email}}
    Greet {{contact.first_name | default: "there"}}.
    """;

var data = JsonNode.Parse("""{ "contact": { "first_name": "Vasyl" } }""");
var schema = JsonNode.Parse("""[
    { "path": "contact.email",      "type": "string" },
    { "path": "contact.first_name", "type": "string" }
]""");

var res = engine.Render(src, data, schema);
Console.WriteLine(res["text"]);
// Help with billing.
//
// Greet Vasyl.
// res["directives"] → [{"name":"verify_before",…}, {"name":"identity",…}]
  • Render(template, data?, schema?, options?) → { text, warnings, resolvedBranches, directives, tokenEstimate }
  • Validate(template, schema?, options?) → { diagnostics, maxTokenEstimate }
  • Parse(template) → { ast, diagnostics }

Never throws for template problems — they degrade to empty output plus a warning. Pass options.now (epoch ms) for datetime filters.

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 was computed.  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. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

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Version Downloads Last Updated
1.1.0 55 7/9/2026
1.0.4 56 7/7/2026
1.0.3 67 7/6/2026
1.0.2 47 7/4/2026
1.0.0 48 7/4/2026