diff --git a/conventions/copilot-lsp-csharp/README.md b/conventions/copilot-lsp-csharp/README.md
index 5f7bb3c..6afa3d2 100644
--- a/conventions/copilot-lsp-csharp/README.md
+++ b/conventions/copilot-lsp-csharp/README.md
@@ -4,7 +4,7 @@ Applies the published C# GitHub Copilot CLI LSP server configuration.
 
 ## Behavior
 
-The convention applies a fixed `csharp` server definition that runs `dnx --yes --prerelease roslyn-language-server -- --stdio --autoLoadProjects` for `.cs` and `.cshtml` files.
+The convention applies a fixed `csharp` server definition that runs `dnx roslyn-language-server --yes --prerelease -- --stdio --autoLoadProjects`, sets the working directory to `${PLUGIN_ROOT}`, and applies the server mapping for `.cs`, `.razor`, and `.cshtml` files.
 
 ## Example
 
diff --git a/conventions/copilot-lsp-csharp/convention.yml b/conventions/copilot-lsp-csharp/convention.yml
index cf1fea8..90bee2f 100644
--- a/conventions/copilot-lsp-csharp/convention.yml
+++ b/conventions/copilot-lsp-csharp/convention.yml
@@ -7,7 +7,10 @@ conventions:
       servers:
         csharp:
           command: dnx
-          args: [--yes, --prerelease, roslyn-language-server, --, --stdio, --autoLoadProjects]
+          args: [roslyn-language-server, --yes, --prerelease, --, --stdio, --autoLoadProjects]
+          cwd: ${PLUGIN_ROOT}
           fileExtensions:
             .cs: csharp
-            .cshtml: csharp
\ No newline at end of file
+            .razor: aspnetcorerazor
+            .cshtml: aspnetcorerazor
+          warmupTimeoutMs: 120000