attribute exclusion files

--- a/src/ApiCompat/Microsoft.DotNet.ApiCompat.Shared/ValidateAssemblies.cs
+++ b/src/ApiCompat/Microsoft.DotNet.ApiCompat.Shared/ValidateAssemblies.cs
@@ -40,6 +40,7 @@ internal static class ValidateAssemblies
             bool generateSuppressionFile,
             string? suppressionFile,
             string? noWarn, 
+            string[]? excludeAttributesFiles,
             string[] leftAssemblies,
             string[] rightAssemblies,
             bool enableStrictMode,
@@ -55,7 +56,7 @@ internal static class ValidateAssemblies
             // Initialize the service provider
             ValidateAssembliesServiceProvider serviceProvider = new(logFactory,
                 () => new SuppressionEngine(suppressionFileForEngine, noWarn, generateSuppressionFile),
-                new RuleFactory());
+                new RuleFactory(excludeAttributesFiles));
 
             IApiCompatRunner apiCompatRunner = serviceProvider.GetService<IApiCompatRunner>();
             ApiCompatRunnerOptions apiCompatOptions = new(enableStrictMode);
diff --git a/src/ApiCompat/Microsoft.DotNet.ApiCompat.Shared/ValidatePackage.cs b/src/ApiCompat/Microsoft.DotNet.ApiCompat.Shared/ValidatePackage.cs
index 273e5d60e7..0d3688c286 100644
--- a/src/ApiCompat/Microsoft.DotNet.ApiCompat.Shared/ValidatePackage.cs
+++ b/src/ApiCompat/Microsoft.DotNet.ApiCompat.Shared/ValidatePackage.cs
@@ -44,6 +44,7 @@ internal static class ValidatePackage
             bool generateSuppressionFile,
             string? suppressionFile,
             string? noWarn,
+            string[]? excludeAttributesFiles,
             string packagePath,
             bool runApiCompat,
             bool enableStrictModeForCompatibleTfms,
@@ -60,7 +61,7 @@ internal static class ValidatePackage
             // Initialize the service provider
             ValidatePackageServiceProvider serviceProvider = new(logFactory,
                 () => new SuppressionEngine(suppressionFileForEngine, noWarn, generateSuppressionFile),
-                new RuleFactory());
+                new RuleFactory(excludeAttributesFiles));
 
             // If a runtime graph is provided, parse and use it for asset selection during the in-memory package construction.
             if (runtimeGraph != null)
diff --git a/src/ApiCompat/Microsoft.DotNet.ApiCompat.Task/ValidateAssembliesTask.cs b/src/ApiCompat/Microsoft.DotNet.ApiCompat.Task/ValidateAssembliesTask.cs
index 48af257795..0fdf210d5a 100644
--- a/src/ApiCompat/Microsoft.DotNet.ApiCompat.Task/ValidateAssembliesTask.cs
+++ b/src/ApiCompat/Microsoft.DotNet.ApiCompat.Task/ValidateAssembliesTask.cs
@@ -48,6 +48,11 @@ public class ValidateAssembliesTask : TaskBase
         /// </summary>
         public string? NoWarn { get; set; }
 
+        /// <summary>
+        /// Set of files with types in DocId format of which attributes to exclude.
+        /// </summary>
+        public string[]? ExcludeAttributesFiles { get; set; }
+
         /// <summary>
         /// Performs api comparison checks in strict mode.
         /// </summary>
@@ -108,6 +113,7 @@ protected override void ExecuteCore()
                 GenerateCompatibilitySuppressionFile,
                 CompatibilitySuppressionFilePath,
                 NoWarn,
+                ExcludeAttributesFiles,
                 LeftAssemblies!,
                 RightAssemblies!,
                 EnableStrictMode,
diff --git a/src/ApiCompat/Microsoft.DotNet.ApiCompat.Task/ValidatePackageTask.cs b/src/ApiCompat/Microsoft.DotNet.ApiCompat.Task/ValidatePackageTask.cs
index 663c63387f..30460ce289 100644
--- a/src/ApiCompat/Microsoft.DotNet.ApiCompat.Task/ValidatePackageTask.cs
+++ b/src/ApiCompat/Microsoft.DotNet.ApiCompat.Task/ValidatePackageTask.cs
@@ -38,6 +38,11 @@ public class ValidatePackageTask : TaskBase
         /// </summary>
         public string? NoWarn { get; set; }
 
+        /// <summary>
+        /// Set of files with types in DocId format of which attributes to exclude.
+        /// </summary>
+        public string[]? ExcludeAttributesFiles { get; set; }
+
         /// <summary>
         /// If true, performs api compatibility checks on the package assets.
         /// </summary>
@@ -124,6 +129,7 @@ protected override void ExecuteCore()
                 GenerateCompatibilitySuppressionFile,
                 CompatibilitySuppressionFilePath,
                 NoWarn,
+                ExcludeAttributesFiles,
                 PackageTargetPath!,
                 RunApiCompat,
                 EnableStrictModeForCompatibleTfms,
diff --git a/src/ApiCompat/Microsoft.DotNet.ApiCompat.Task/build/Microsoft.DotNet.ApiCompat.ValidateAssemblies.Common.targets b/src/ApiCompat/Microsoft.DotNet.ApiCompat.Task/build/Microsoft.DotNet.ApiCompat.ValidateAssemblies.Common.targets
index 299a6d7da8..99a262fc4c 100644
--- a/src/ApiCompat/Microsoft.DotNet.ApiCompat.Task/build/Microsoft.DotNet.ApiCompat.ValidateAssemblies.Common.targets
+++ b/src/ApiCompat/Microsoft.DotNet.ApiCompat.Task/build/Microsoft.DotNet.ApiCompat.ValidateAssemblies.Common.targets
@@ -19,6 +19,7 @@
       GenerateCompatibilitySuppressionFile="$(GenerateCompatibilitySuppressionFile)"
       CompatibilitySuppressionFilePath="$(CompatibilitySuppressionFilePath)"
       NoWarn="$(NoWarn)"
+      ExcludeAttributesFiles="@(ApiCompatExcludeAttributesFile)"
       EnableStrictMode="$(ApiCompatStrictMode)"
       LeftAssembliesReferences="@(ApiCompatLeftAssembliesReferences)"
       RightAssembliesReferences="@(ApiCompatRightAssembliesReferences)"
diff --git a/src/ApiCompat/Microsoft.DotNet.ApiCompat.Tool/Program.cs b/src/ApiCompat/Microsoft.DotNet.ApiCompat.Tool/Program.cs
index 1f63d47ea7..13ab069d10 100644
--- a/src/ApiCompat/Microsoft.DotNet.ApiCompat.Tool/Program.cs
+++ b/src/ApiCompat/Microsoft.DotNet.ApiCompat.Tool/Program.cs
@@ -35,6 +35,9 @@ static int Main(string[] args)
             Option<MessageImportance> verbosityOption = new(new string[] { "--verbosity", "-v" },
                 "Controls the log level verbosity. Allowed values are high, normal, and low.");
             verbosityOption.SetDefaultValue(MessageImportance.Normal);
+            Option<string[]> excludeAttributesFilesOption = new("--exclude-attributes-file",
+                "The path to one or more attribute exclusion files with types in DocId format.");
+
 
             // Root command
             Option<string[]> leftAssembliesOption = new(new string[] { "--left-assembly", "--left", "-l" },
@@ -95,6 +98,7 @@ static int Main(string[] args)
             rootCommand.AddGlobalOption(noWarnOption);
             rootCommand.AddGlobalOption(roslynAssembliesPathOption);
             rootCommand.AddGlobalOption(verbosityOption);
+            rootCommand.AddGlobalOption(excludeAttributesFilesOption);
 
             rootCommand.AddOption(leftAssembliesOption);
             rootCommand.AddOption(rightAssembliesOption);
@@ -117,6 +121,8 @@ static int Main(string[] args)
                 bool generateSuppressionFile = context.ParseResult.GetValueForOption(generateSuppressionFileOption);
                 string? suppressionFile = context.ParseResult.GetValueForOption(suppressionFileOption);
                 string? noWarn = context.ParseResult.GetValueForOption(noWarnOption);
+                string[]? excludeAttributesFiles = context.ParseResult.GetValueForOption(excludeAttributesFilesOption);
+
                 string[] leftAssemblies = context.ParseResult.GetValueForOption(leftAssembliesOption)!;
                 string[] rightAssemblies = context.ParseResult.GetValueForOption(rightAssembliesOption)!;
                 bool strictMode = context.ParseResult.GetValueForOption(strictModeOption);
@@ -131,6 +137,7 @@ static int Main(string[] args)
                     generateSuppressionFile,
                     suppressionFile,
                     noWarn,
+                    excludeAttributesFiles,
                     leftAssemblies,
                     rightAssemblies,
                     strictMode,
@@ -205,6 +212,8 @@ static int Main(string[] args)
                 bool generateSuppressionFile = context.ParseResult.GetValueForOption(generateSuppressionFileOption);
                 string? suppressionFile = context.ParseResult.GetValueForOption(suppressionFileOption);
                 string? noWarn = context.ParseResult.GetValueForOption(noWarnOption);
+                string[]? excludeAttributesFiles = context.ParseResult.GetValueForOption(excludeAttributesFilesOption);
+
                 string package = context.ParseResult.GetValueForArgument(packageArgument);
                 bool runApiCompat = context.ParseResult.GetValueForOption(runApiCompatOption);
                 bool enableStrictModeForCompatibleTfms = context.ParseResult.GetValueForOption(enableStrictModeForCompatibleTfmsOption);
@@ -220,6 +229,7 @@ static int Main(string[] args)
                     generateSuppressionFile,
                     suppressionFile,
                     noWarn,
+                    excludeAttributesFiles,
                     package,
                     runApiCompat,
                     enableStrictModeForCompatibleTfms,
diff --git a/src/ApiCompat/Microsoft.DotNet.ApiCompatibility/Rules/RuleFactory.cs b/src/ApiCompat/Microsoft.DotNet.ApiCompatibility/Rules/RuleFactory.cs
index a4dd2d3d0c..5e810cc997 100644
--- a/src/ApiCompat/Microsoft.DotNet.ApiCompatibility/Rules/RuleFactory.cs
+++ b/src/ApiCompat/Microsoft.DotNet.ApiCompatibility/Rules/RuleFactory.cs
@@ -1,6 +1,8 @@
 // Copyright (c) .NET Foundation and contributors. All rights reserved.
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
+using System.Collections.Generic;
+
 namespace Microsoft.DotNet.ApiCompatibility.Rules
 {
     /// <summary>
@@ -8,6 +10,13 @@ namespace Microsoft.DotNet.ApiCompatibility.Rules
     /// </summary>
     public class RuleFactory : IRuleFactory
     {
+        private readonly IEnumerable<string>? _excludeAttributesFiles;
+
+        public RuleFactory(IEnumerable<string>? excludeAttributesFiles = null)
+        {
+            _excludeAttributesFiles = excludeAttributesFiles;
+        }
+
         /// <inheritdoc />
         public IRule[] CreateRules(RuleSettings settings, IRuleRegistrationContext context)
         {
@@ -21,6 +30,7 @@ public IRule[] CreateRules(RuleSettings settings, IRuleRegistrationContext conte
                 new CannotSealType(settings, context),
                 new EnumsMustMatch(settings, context),
                 new MembersMustExist(settings, context)
+                // TODO: Add AttributesRule and pass in _excludeAttributesFiles
             };
         }
     }
diff --git a/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.ApiCompat.ValidatePackage.targets b/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.ApiCompat.ValidatePackage.targets
index f86d5d3c32..b21681c980 100644
--- a/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.ApiCompat.ValidatePackage.targets
+++ b/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.ApiCompat.ValidatePackage.targets
@@ -33,6 +33,7 @@ Copyright (c) .NET Foundation. All rights reserved.
       PackageTargetPath="$([MSBuild]::ValueOrDefault('$(PackageTargetPath)', '$([MSBuild]::NormalizePath('$(PackageOutputPath)', '$(PackageId).$(PackageVersion).nupkg'))'))"
       RuntimeGraph="$(RuntimeIdentifierGraphPath)"
       NoWarn="$(NoWarn)"
+      ExcludeAttributesFiles="@(ApiCompatExcludeAttributesFile)"
       RunApiCompat="$(RunApiCompat)"
       EnableStrictModeForCompatibleTfms="$([MSBuild]::ValueOrDefault('$(EnableStrictModeForCompatibleTfms)', 'true'))"
       EnableStrictModeForCompatibleFrameworksInPackage="$(EnableStrictModeForCompatibleFrameworksInPackage)"