NugetMcpServer

NugetMcpServer – A Real‑Time NuGet Metadata Provider for AI Assistants

NugetMcpServer solves the perennial problem of hallucinated API references that plague large language models. When an AI assistant generates code, it often relies on its internal training data—a snapshot of the .NET ecosystem that can be outdated or incomplete. By exposing a Model Context Protocol (MCP) server, NugetMcpServer gives the assistant direct access to the authoritative metadata of any NuGet package. Developers can now query for exact interface, class, enum, record, or struct definitions and receive up‑to‑date signatures, documentation comments, and dependency information. This precision dramatically reduces the risk of runtime errors caused by incorrect assumptions about a package’s API surface.

At its core, NugetMcpServer offers a suite of query tools that interact with the official NuGet repository. The server can retrieve definitions for specific types, list all public interfaces in a package, or fetch enum declarations. It supports version‑specific queries so developers can target the exact release they intend to use, or default to the latest stable version. A two‑phase search mechanism, coupled with AI‑powered keyword generation, allows the server to surface relevant packages even when names are ambiguous or misspelled. Results are ranked by download count, giving priority to widely adopted packages and helping users avoid obscure or unmaintained libraries.

The server’s integration points are designed for seamless adoption in modern AI workflows. It registers as an MCP server that can be discovered by tools such as VS Code’s Copilot, OllamaChat, or any custom MCP‑compatible client. A single command in the VS Code Command Palette starts the server, after which developers can invoke it from chat interfaces or code completion contexts. For example, a Copilot Chat session might ask the assistant to “show me the interface definition for in version 6.0”. The assistant forwards the request to NugetMcpServer, which returns a clean C# snippet that can be copied directly into the project.

NugetMcpServer’s unique advantages stem from its focus on accuracy and real‑time data. Unlike static documentation generators, it queries the live NuGet feed, ensuring that even pre‑release or patched packages are reflected in the results. The server also detects meta‑packages—those that bundle multiple dependencies—and warns users, preventing accidental inclusion of unnecessary libraries. By coupling these capabilities with MCP’s lightweight protocol, NugetMcpServer becomes a plug‑in to any AI development environment that needs trustworthy package metadata, thereby elevating the reliability of code generation and reducing the cognitive load on developers.