dotnet-template-mcp

DotnetTemplateMCP

An MCP server that lets AI agents work with dotnet new templates — search, inspect, preview, and create projects through natural conversation instead of memorizing CLI flags.

Instead of this:

dotnet new list --language C#
dotnet new webapi --help
dotnet new webapi --auth Individual --use-controllers --name MyApi --output ./MyApi

Your AI agent just says: "I need a web API with authentication and controllers" — and the MCP server figures out the rest.

Template Validation for Authors

Building a custom dotnet new template? template_validate catches mistakes before you publish — no more guessing if your template.json is correct:

Agent calls: template_validate("./my-template")

← Returns:
{
  "valid": false,
  "summary": "2 error(s), 1 warning(s), 3 suggestion(s)",
  "errors": [
    "Missing required field 'shortName'.",
    "Parameter 'Framework': default value 'net7.0' is not in the choices list."
  ],
  "warnings": [
    "Missing 'sourceName'. Without it, the generated project name won't be customizable via --name."
  ],
  "suggestions": [
    "Consider adding a 'description' field to help users understand what this template creates.",
    "Consider adding 'language' tag (e.g., 'C#') for better discoverability.",
    "Consider adding 'type' tag (e.g., 'project', 'item') for filtering."
  ]
}

What it catches: missing required fields, invalid identity format, short name conflicts with CLI commands, parameter issues (missing defaults, empty choices, prefix collisions, type mismatches), broken computed symbols, constraint misconfiguration, and missing tags.

How this relates to the official tooling. Microsoft ships template authoring validation already, and you should know about it:

Official tool	What it gives you
Microsoft.TemplateEngine.Authoring.CLI	dotnet template-authoring validate — the reference validator
Microsoft.TemplateEngine.Authoring.Tasks	Validation at build time, as an MSBuild task
Microsoft.TemplateEngine.Authoring.TemplateVerifier	Snapshot testing of template output

What template_validate adds is not the validation itself — it is the delivery: a single structured JSON payload, split into errors/warnings/suggestions with fix-oriented messages, returned in-band to an agent that is already editing the template. No install step, no output parsing, no second tool in the loop. If you are a human authoring templates in CI, prefer the official tools above; they are the reference implementation and cover cases this does not.

Tools

Tool	What it does
template_search	Search locally and on NuGet.org — one call, ranked results
template_list	List what's installed, filter by language/type/classification
template_inspect	Parameters, constraints, post-actions — all in one shot
template_instantiate	Create a project. Not installed? Auto-resolves from NuGet. Elicits missing params interactively
template_dry_run	Preview files without touching disk
template_install	Install a package (idempotent — skips if already there)
template_uninstall	Remove a template package
templates_installed	Inventory of everything installed
template_from_intent	"web API with auth" → webapi + auth=Individual — no LLM needed
template_create_from_existing	Analyze a .csproj → generate a reusable template matching repo conventions
template_compose	Execute a sequence of templates (project + items) in one workflow
template_suggest_parameters	Suggest parameter values with rationale based on cross-parameter relationships
template_validate	Validate a local template directory for authoring issues before publishing
template_compare	Compare 2+ templates side by side — parameters, features, frameworks
solution_analyze	Analyze a solution/workspace — project structure, frameworks, CPM status
packages_upgrade	Scan a project/solution/folder for outdated NuGet versions and report or apply upgrades (CPM-aware)

📖 Full tool reference →

Hosted deployment

A hosted deployment is available on Fronteir AI.

Quick Start

Global tool (.NET 8+)

dotnet tool install --global DotnetTemplateMCP --version 2.0.0

Zero-install with dnx (.NET 10+)

dnx -y DotnetTemplateMCP --version 2.0.0

VS Code / GitHub Copilot

Add to mcp.json:

{
  "servers": {
    "dotnet-templates": {
      "type": "stdio",
      "command": "dnx",
      "args": ["-y", "DotnetTemplateMCP", "--version", "2.0.0"]
    }
  }
}

📖 Claude Desktop, Cursor, and more →

Transport Modes

Stdio (default)

Standard I/O transport for local CLI and tool usage:

template-engine-mcp                     # stdio is the default
template-engine-mcp --transport stdio   # explicit

HTTP (remote / team-shared)

Streamable HTTP transport for remote or CI/CD deployment.

Authentication is mandatory. Every tool in this server writes files and installs NuGet packages, so an open endpoint is a remote code execution surface. The server refuses to start the HTTP transport unless you either set a token or explicitly opt in to anonymous access:

# Recommended
MCP_TEMPLATE_HTTP_TOKEN=<shared-secret> template-engine-mcp --transport http

# Only for a trusted, isolated network
MCP_TEMPLATE_HTTP_ALLOW_ANONYMOUS=true template-engine-mcp --transport http

Clients authenticate with Authorization: Bearer <shared-secret>. Requests to /mcp are rate limited per client (default 120/minute, MCP_TEMPLATE_HTTP_RATE_LIMIT=0 disables). /health stays anonymous for probes.

Not multi-tenant. TemplateEngineService is a process-wide singleton with virtualizeSettings: false, so the installed-template set is shared by every caller, and the workspace root is process-wide. Run one instance per trusted team or per tenant — do not expose a single instance to mutually untrusting users.

template-engine-mcp --transport http
# or via environment variable:
MCP_TEMPLATE_TRANSPORT=http template-engine-mcp

The HTTP server exposes:

• /mcp — MCP streamable HTTP endpoint (bearer token required)
• /health — Health check endpoint (anonymous)

Configure the listen URL:

MCP_TEMPLATE_HTTP_URL=http://0.0.0.0:8080 template-engine-mcp --transport http

Connect your MCP client:

{
  "servers": {
    "dotnet-templates": {
      "type": "http",
      "url": "http://localhost:5005/mcp"
    }
  }
}

Interactive Elicitation

When a template has required parameters that weren't provided, the server asks the user interactively via MCP elicitation — instead of failing. Template parameter types are mapped to form fields:

Template Parameter	Elicitation Field
string	Text input
bool / boolean	Checkbox
int / number	Number input
Choice parameter	Single-select dropdown

Disable with MCP_TEMPLATE_ELICITATION=false.

How it works

You: "I need a web API with authentication, controllers, and Docker support"

→ template_from_intent extracts keywords: web api, authentication, controllers, docker
→ Matches: webapi (confidence: 0.85)
→ Resolves: auth=Individual, UseControllers=true, EnableDocker=true
→ template_instantiate creates the project

The server also does smart defaults (AOT → latest framework, auth → HTTPS stays on), parameter validation before writing files, constraint checking (OS, SDK, workload), interactive elicitation of missing required parameters, and auto-resolves templates from NuGet if they're not installed.

CPM & Latest Package Versions

When creating a project inside a solution that uses Central Package Management, the server automatically:

1. Detects Directory.Packages.props by walking up the directory tree
2. Strips Version attributes from generated .csproj PackageReferences
3. Adds missing <PackageVersion> entries to Directory.Packages.props
4. Resolves latest stable NuGet versions — no more stale hardcoded versions from templates

Before (what dotnet new generates):
  <PackageReference Include="Serilog" Version="3.1.0" />    ← stale, breaks CPM

After (what template_instantiate produces):
  .csproj:                    <PackageReference Include="Serilog" />
  Directory.Packages.props:   <PackageVersion Include="Serilog" Version="4.2.0" />

Works for standalone projects too — versions are updated directly in the .csproj.

Multi-Template Composition

Chain multiple templates in one call with template_compose:

[
  {"templateName": "webapi", "name": "MyApi", "parametersJson": "{\"auth\": \"Individual\"}"},
  {"templateName": "gitignore", "target": "."}
]

📖 Architecture & smart behaviors →

Tool Profiles (Lite vs Full)

By default, all 15 tools are available. If your agent works better with fewer tools, set the MCP_TEMPLATE_TOOL_PROFILE environment variable:

Profile	Tools	When to use
full (default)	All 15 tools	Full control — advanced workflows, composition, custom templates
lite	5 core tools	Simpler agents that just need to find and create projects

Lite profile tools: template_from_intent, template_instantiate, template_inspect, template_search, template_dry_run

{
  "servers": {
    "dotnet-template-mcp": {
      "command": "dotnet-template-mcp",
      "env": {
        "MCP_TEMPLATE_TOOL_PROFILE": "lite"
      }
    }
  }
}

Non-lite tools will return a helpful message explaining they're disabled and how to enable them.

Documentation

Doc	What's in it
Configuration	VS Code, Claude Desktop, Cursor setup + troubleshooting
Tool Reference	Every tool's parameters, types, and examples
Architecture	Template cache, smart behaviors, telemetry, project structure
MCP vs Skills	Why MCP over Copilot Skills — benefits and downsides
Plain LLM vs MCP	Side-by-side: what a plain LLM does vs. the MCP tool (4 scenarios)
Skills Equivalent	What it'd take to cover this with Skills instead

Building & Testing

dotnet build
dotnet test    # 185+ tests — unit, integration, and E2E

CI runs on push/PR via GitHub Actions (Ubuntu + Windows).

Contributing

Contributions are welcome! Please open an issue to discuss proposed changes before submitting a PR.

# Setup
dotnet restore
dotnet build

# Run tests
dotnet test

# Pack locally
dotnet pack src/DotnetTemplateMcp -o nupkg/

Changelog

See CHANGELOG.md for release history.

License

MIT