feat: Add Enterprise Managed Authorization (SEP-990) support (#1305)

src/ModelContextProtocol.Core/Authentication/IdentityAssertionGrantContext.cs

@@ -0,0 +1,20 @@
+namespace ModelContextProtocol.Authentication;
+
+/// <summary>
+/// Context provided to the <see cref="IdentityAssertionGrantIdTokenCallback"/> for a Cross-Application Access
+/// authorization flow. Contains the URLs discovered during the OAuth flow needed for the token exchange step.
+/// </summary>
+public sealed class IdentityAssertionGrantContext
+{
+    /// <summary>
+    /// Gets the MCP resource server URL (i.e., the <c>resource</c> parameter for token exchange).
+    /// This is the URL of the MCP server being accessed.
+    /// </summary>
+    public required Uri ResourceUrl { get; init; }
+
+    /// <summary>
+    /// Gets the MCP authorization server URL (i.e., the <c>audience</c> parameter for token exchange).
+    /// This is the URL of the authorization server protecting the MCP resource.
+    /// </summary>
+    public required Uri AuthorizationServerUrl { get; init; }
+}