Update A2A Packages

Directory.Packages.props

@@ -2,13 +2,13 @@
   <PropertyGroup>
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
     <CentralPackageTransitivePinningEnabled>true</CentralPackageTransitivePinningEnabled>
-    <ModelContextProtocolVersion>2.0.0</ModelContextProtocolVersion>
+    <ModelContextProtocolVersion>2.2.0</ModelContextProtocolVersion>
     <GitHubCopilotSdkVersion>1.0.8</GitHubCopilotSdkVersion>
   </PropertyGroup>
   <ItemGroup>
     <!-- Miscellaneous Packages -->
-    <PackageVersion Include="A2A" Version="0.3.4-preview" />
-    <PackageVersion Include="A2A.AspNetCore" Version="0.3.4-preview" />
+    <PackageVersion Include="A2A" Version="1.0.0-preview2" />
+    <PackageVersion Include="A2A.AspNetCore" Version="1.0.0-preview2" />
     <PackageVersion Include="Anthropic" Version="12.39.0" />
     <PackageVersion Include="DocumentFormat.OpenXml" Version="3.5.1" />
     <PackageVersion Include="Elastic.Clients.Elasticsearch" Version="[8.19.23,9.0.0)" />
@@ -28,9 +28,9 @@
     <PackageVersion Include="PdfPig" Version="0.1.15" />
     <PackageVersion Include="PDFsharp-MigraDoc" Version="6.2.4" />
     <PackageVersion Include="SSH.NET" Version="2026.0.0" />
-    <PackageVersion Include="YesSql.Abstractions" Version="5.4.7" />
-    <PackageVersion Include="YesSql.Core" Version="5.4.7" />
-    <PackageVersion Include="YesSql.Provider.Sqlite" Version="5.4.7" />
+    <PackageVersion Include="YesSql.Abstractions" Version="6.0.0" />
+    <PackageVersion Include="YesSql.Core" Version="6.0.0" />
+    <PackageVersion Include="YesSql.Provider.Sqlite" Version="6.0.0" />
     <PackageVersion Include="ZString" Version="2.6.0" />
   </ItemGroup>
   <ItemGroup>

benchmarks/CrestApps.Core.Benchmarks/A2AToolRegistryProviderBenchmarks.cs

@@ -79,7 +79,13 @@ public void Setup()
             {
                 Name = $"Agent {connectionIndex}",
                 Description = $"Benchmark agent {connectionIndex}.",
-                Url = $"https://agent-{connectionIndex}.example",
+                SupportedInterfaces =
+                [
+                    new AgentInterface
+                    {
+                        Url = $"https://agent-{connectionIndex}.example",
+                    },
+                ],
                 Version = "1.0",
                 Skills = skills,
             }));

benchmarks/CrestApps.Core.Benchmarks/CrestApps.Core.Benchmarks.csproj

@@ -3,6 +3,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <IsPackable>false</IsPackable>
+    <NoWarn>$(NoWarn);CA1001;CA1305;CA1848</NoWarn>
   </PropertyGroup>
 
   <ItemGroup>

src/CrestApps.Core.Docs/docs/changelog/1.2.0.md

@@ -13,6 +13,11 @@ description: Release notes for the CrestApps.Core 1.2.0 release.
 
 ## Change Logs
 
+- Updated the A2A client, proxy tools, MVC sample host, and Blazor sample host to use the A2A 1.0 preview protocol models and ASP.NET Core endpoint APIs.
+- Updated A2A tests and benchmark build settings for the A2A 1.0 preview API and stricter analyzer defaults.
+- Fixed the A2A client sample error handling so authentication redirects and non-JSON host responses produce actionable messages instead of JSON parser errors.
+- Corrected the A2A client sample's standalone MVC and Blazor host endpoints to match each project's HTTPS launch URL and improved local TLS/connection error messages.
+- Updated the Aspire sample host to set the effective A2A host options for local unauthenticated A2A sample-client calls.
 - Downgraded YesSql to 5.4.7 to unblock the release of CrestApps.OrchardCore 2.1.
 - upgrades SSH.NET to 2026.0.0 to address the high-severity
   [GHSA-q939-rpr3-3284](https://github.com/advisories/GHSA-q939-rpr3-3284)

src/Primitives/CrestApps.Core.AI.A2A/A2ALog.cs

@@ -0,0 +1,105 @@
+using Microsoft.Extensions.Logging;
+
+namespace CrestApps.Core.AI.A2A;
+
+internal static class A2ALog
+{
+    private static readonly Action<ILogger, string, Exception> _failedToLoadAgentCardForConnection =
+        LoggerMessage.Define<string>(
+            LogLevel.Warning,
+            new EventId(1001, nameof(FailedToLoadAgentCardForConnection)),
+            "Failed to load agent card for A2A connection '{ConnectionId}'.");
+
+    private static readonly Action<ILogger, string, string, Exception> _failedToFetchAgentCardFromHost =
+        LoggerMessage.Define<string, string>(
+            LogLevel.Warning,
+            new EventId(1002, nameof(FailedToFetchAgentCardFromHost)),
+            "Failed to fetch agent card from A2A host '{Endpoint}' for connection '{ConnectionId}'.");
+
+    private static readonly Action<ILogger, string, string, Exception> _failedToCommunicateWithRemoteAgent =
+        LoggerMessage.Define<string, string>(
+            LogLevel.Error,
+            new EventId(1003, nameof(FailedToCommunicateWithRemoteAgent)),
+            "Failed to communicate with remote A2A agent '{AgentName}' at '{Endpoint}'.");
+
+    private static readonly Action<ILogger, Exception> _failedToListLocalAgentProfiles =
+        LoggerMessage.Define(
+            LogLevel.Warning,
+            new EventId(1004, nameof(FailedToListLocalAgentProfiles)),
+            "Failed to list local agent profiles.");
+
+    private static readonly Action<ILogger, string, Exception> _failedToFetchAgentCardFromConnection =
+        LoggerMessage.Define<string>(
+            LogLevel.Warning,
+            new EventId(1005, nameof(FailedToFetchAgentCardFromConnection)),
+            "Failed to fetch agent card from A2A connection '{ConnectionId}'.");
+
+    private static readonly Action<ILogger, Exception> _failedToListRemoteA2AAgents =
+        LoggerMessage.Define(
+            LogLevel.Warning,
+            new EventId(1006, nameof(FailedToListRemoteA2AAgents)),
+            "Failed to list remote A2A agents.");
+
+    private static readonly Action<ILogger, Exception> _failedToSearchForTools =
+        LoggerMessage.Define(
+            LogLevel.Warning,
+            new EventId(1007, nameof(FailedToSearchForTools)),
+            "Failed to search for tools.");
+
+    private static readonly Action<ILogger, Exception> _failedToSearchLocalAgentProfiles =
+        LoggerMessage.Define(
+            LogLevel.Warning,
+            new EventId(1008, nameof(FailedToSearchLocalAgentProfiles)),
+            "Failed to search local agent profiles.");
+
+    private static readonly Action<ILogger, Exception> _failedToSearchRemoteA2AAgents =
+        LoggerMessage.Define(
+            LogLevel.Warning,
+            new EventId(1009, nameof(FailedToSearchRemoteA2AAgents)),
+            "Failed to search remote A2A agents.");
+
+    public static void FailedToLoadAgentCardForConnection(ILogger logger, string connectionId, Exception exception)
+    {
+        _failedToLoadAgentCardForConnection(logger, connectionId, exception);
+    }
+
+    public static void FailedToFetchAgentCardFromHost(ILogger logger, string endpoint, string connectionId, Exception exception)
+    {
+        _failedToFetchAgentCardFromHost(logger, endpoint, connectionId, exception);
+    }
+
+    public static void FailedToCommunicateWithRemoteAgent(ILogger logger, string agentName, string endpoint, Exception exception)
+    {
+        _failedToCommunicateWithRemoteAgent(logger, agentName, endpoint, exception);
+    }
+
+    public static void FailedToListLocalAgentProfiles(ILogger logger, Exception exception)
+    {
+        _failedToListLocalAgentProfiles(logger, exception);
+    }
+
+    public static void FailedToFetchAgentCardFromConnection(ILogger logger, string connectionId, Exception exception)
+    {
+        _failedToFetchAgentCardFromConnection(logger, connectionId, exception);
+    }
+
+    public static void FailedToListRemoteA2AAgents(ILogger logger, Exception exception)
+    {
+        _failedToListRemoteA2AAgents(logger, exception);
+    }
+
+    public static void FailedToSearchForTools(ILogger logger, Exception exception)
+    {
+        _failedToSearchForTools(logger, exception);
+    }
+
+    public static void FailedToSearchLocalAgentProfiles(ILogger logger, Exception exception)
+    {
+        _failedToSearchLocalAgentProfiles(logger, exception);
+    }
+
+    public static void FailedToSearchRemoteA2AAgents(ILogger logger, Exception exception)
+    {
+        _failedToSearchRemoteA2AAgents(logger, exception);
+    }
+}

src/Primitives/CrestApps.Core.AI.A2A/Functions/FindAgentForTaskFunction.cs

@@ -1,4 +1,5 @@
 using System.Text.Json;
+using CrestApps.Core.AI.A2A;
 using CrestApps.Core.AI.A2A.Models;
 using CrestApps.Core.AI.A2A.Services;
 using CrestApps.Core.AI.Extensions;
@@ -106,7 +107,7 @@ protected override async ValueTask<object> InvokeCoreAsync(AIFunctionArguments a
         }
         catch (Exception ex)
         {
-            logger.LogWarning(ex, "Failed to search local agent profiles.");
+            A2ALog.FailedToSearchLocalAgentProfiles(logger, ex);
         }
 
         try
@@ -143,13 +144,13 @@ protected override async ValueTask<object> InvokeCoreAsync(AIFunctionArguments a
                 }
                 catch (Exception ex)
                 {
-                    logger.LogWarning(ex, "Failed to fetch agent card from A2A connection '{ConnectionId}'.", connection.ItemId);
+                    A2ALog.FailedToFetchAgentCardFromConnection(logger, connection.ItemId, ex);
                 }
             }
         }
         catch (Exception ex)
         {
-            logger.LogWarning(ex, "Failed to search remote A2A agents.");
+            A2ALog.FailedToSearchRemoteA2AAgents(logger, ex);
         }
 
         var results = scoredAgents.Where(s => s.Score > 0).OrderByDescending(s => s.Score).Take(maxResults).Select(s => s.Agent).ToList();

src/Primitives/CrestApps.Core.AI.A2A/Functions/FindToolsForTaskFunction.cs

@@ -1,4 +1,5 @@
 using System.Text.Json;
+using CrestApps.Core.AI.A2A;
 using CrestApps.Core.AI.A2A.Models;
 using CrestApps.Core.AI.Extensions;
 using CrestApps.Core.AI.Models;
@@ -111,7 +112,7 @@ protected override async ValueTask<object> InvokeCoreAsync(AIFunctionArguments a
         }
         catch (Exception ex)
         {
-            logger.LogWarning(ex, "Failed to search for tools.");
+            A2ALog.FailedToSearchForTools(logger, ex);
 
             return "An error occurred while searching for tools.";
         }

src/Primitives/CrestApps.Core.AI.A2A/Functions/ListAvailableAgentsFunction.cs

@@ -1,4 +1,5 @@
 using System.Text.Json;
+using CrestApps.Core.AI.A2A;
 using CrestApps.Core.AI.A2A.Models;
 using CrestApps.Core.AI.A2A.Services;
 using CrestApps.Core.AI.Models;
@@ -66,7 +67,7 @@ protected override async ValueTask<object> InvokeCoreAsync(AIFunctionArguments a
         }
         catch (Exception ex)
         {
-            logger.LogWarning(ex, "Failed to list local agent profiles.");
+            A2ALog.FailedToListLocalAgentProfiles(logger, ex);
         }
 
         try
@@ -96,13 +97,13 @@ protected override async ValueTask<object> InvokeCoreAsync(AIFunctionArguments a
                 }
                 catch (Exception ex)
                 {
-                    logger.LogWarning(ex, "Failed to fetch agent card from A2A connection '{ConnectionId}'.", connection.ItemId);
+                    A2ALog.FailedToFetchAgentCardFromConnection(logger, connection.ItemId, ex);
                 }
             }
         }
         catch (Exception ex)
         {
-            logger.LogWarning(ex, "Failed to list remote A2A agents.");
+            A2ALog.FailedToListRemoteA2AAgents(logger, ex);
         }
 
         return agents.Count > 0 ? JsonSerializer.Serialize(agents) : "No agents are currently available.";

src/Primitives/CrestApps.Core.AI.A2A/Services/A2AAgentProxyTool.cs

@@ -1,5 +1,6 @@
 using System.Text.Json;
 using A2A;
+using CrestApps.Core.AI.A2A;
 using CrestApps.Core.AI.A2A.Models;
 using CrestApps.Core.Services;
 using Microsoft.Extensions.AI;
@@ -111,24 +112,24 @@ protected override async ValueTask<object> InvokeCoreAsync(
 
             var client = new A2AClient(new Uri(_endpoint), httpClient);
 
-            var agentMessage = new AgentMessage
+            var agentMessage = new Message
             {
-                Role = MessageRole.User,
+                Role = Role.User,
                 MessageId = Guid.NewGuid().ToString(),
                 ContextId = contextId ?? Guid.NewGuid().ToString(),
-                Parts = [new TextPart { Text = message }],
+                Parts = [Part.FromText(message)],
                 Metadata = new Dictionary<string, JsonElement>
                 {
                     ["agentName"] = JsonSerializer.SerializeToElement(_agentName),
                 },
             };
 
-            var sendParams = new MessageSendParams
+            var sendRequest = new SendMessageRequest
             {
                 Message = agentMessage,
             };
 
-            var response = await client.SendMessageAsync(sendParams, cancellationToken);
+            var response = await client.SendMessageAsync(sendRequest, cancellationToken);
 
             var responseText = ExtractTextFromResponse(response);
 
@@ -140,7 +141,7 @@ protected override async ValueTask<object> InvokeCoreAsync(
         }
         catch (Exception ex)
         {
-            logger.LogError(ex, "Failed to communicate with remote A2A agent '{AgentName}' at '{Endpoint}'.", _agentName, _endpoint);
+            A2ALog.FailedToCommunicateWithRemoteAgent(logger, _agentName, _endpoint, ex);
 
             return $"An error occurred while communicating with remote agent '{_agentName}'.";
         }
@@ -185,24 +186,25 @@ private static bool TryGetString(
     /// </summary>
     /// <param name="response">The A2A response.</param>
     /// <returns>The response text, or <see langword="null"/> when no usable text exists.</returns>
-    internal static string ExtractTextFromResponse(A2AResponse response)
+    internal static string ExtractTextFromResponse(SendMessageResponse response)
     {
-        if (response is AgentMessage message)
+        if (response.Message is { } message)
         {
-            var texts = message.Parts?.OfType<TextPart>().Select(p => p.Text);
+            var texts = message.Parts.Select(p => p.Text).OfType<string>();
 
-            if (texts?.Any() == true)
+            if (texts.Any())
             {
                 return string.Join(string.Empty, texts);
             }
         }
-        else if (response is AgentTask task)
+        else if (response.Task is { } task)
         {
             if (task.Artifacts?.Count > 0)
             {
                 var artifactTexts = task.Artifacts
-                    .SelectMany(a => a.Parts?.OfType<TextPart>() ?? [])
-                    .Select(p => p.Text);
+                    .SelectMany(a => a.Parts ?? [])
+                    .Select(p => p.Text)
+                    .OfType<string>();
 
                 var combined = string.Join(string.Empty, artifactTexts);
 
@@ -214,7 +216,9 @@ internal static string ExtractTextFromResponse(A2AResponse response)
 
             if (task.Status.Message?.Parts is not null)
             {
-                var statusTexts = task.Status.Message.Parts.OfType<TextPart>().Select(p => p.Text);
+                var statusTexts = task.Status.Message.Parts
+                    .Select(p => p.Text)
+                    .OfType<string>();
 
                 var combined = string.Join(string.Empty, statusTexts);
 

src/Primitives/CrestApps.Core.AI.A2A/Services/A2AToolRegistryProvider.cs

@@ -1,3 +1,4 @@
+using CrestApps.Core.AI.A2A;
 using CrestApps.Core.AI.A2A.Models;
 using CrestApps.Core.AI.Models;
 using CrestApps.Core.AI.Tooling;
@@ -89,7 +90,7 @@ public async Task<IReadOnlyList<ToolRegistryEntry>> GetToolsAsync(
             }
             catch (Exception ex)
             {
-                _logger.LogWarning(ex, "Failed to load agent card for A2A connection '{ConnectionId}'.", connectionId);
+                A2ALog.FailedToLoadAgentCardForConnection(_logger, connectionId, ex);
             }
         }
 

src/Primitives/CrestApps.Core.AI.A2A/Services/DefaultA2AAgentCardCacheService.cs

@@ -1,4 +1,5 @@
 using A2A;
+using CrestApps.Core.AI.A2A;
 using CrestApps.Core.AI.A2A.Models;
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Caching.Memory;
@@ -75,7 +76,7 @@ public async Task<AgentCard> GetAgentCardAsync(string connectionId, A2AConnectio
         }
         catch (Exception ex)
         {
-            _logger.LogWarning(ex, "Failed to fetch agent card from A2A host '{Endpoint}' for connection '{ConnectionId}'.", connection.Endpoint, connectionId);
+            A2ALog.FailedToFetchAgentCardFromHost(_logger, connection.Endpoint, connectionId, ex);
 
             return null;
         }

src/Startup/CrestApps.Core.Aspire.AppHost/Program.cs

@@ -80,8 +80,8 @@ void WriteCrashEntry(string label, object data)
         options.EnvironmentVariables.Add("CrestApps__AI__Providers__Ollama__Connections__Default__Endpoint", "http://localhost:11434");
         options.EnvironmentVariables.Add("CrestApps__AI__Providers__Ollama__Connections__Default__ChatDeploymentName", ollamaModelName);
         options.EnvironmentVariables.Add("CrestApps__MvcApp__MCP__Server__AuthenticationType", "None");
-        options.EnvironmentVariables.Add("CrestApps__MvcApp__A2A__Host__AuthenticationType", "None");
-        options.EnvironmentVariables.Add("CrestApps__MvcApp__A2A__Host__ExposeAgentsAsSkill", "true");
+        options.EnvironmentVariables.Add("A2AHostOptions__AuthenticationType", "None");
+        options.EnvironmentVariables.Add("A2AHostOptions__ExposeAgentsAsSkill", "true");
         options.EnvironmentVariables.Add("CrestApps__PostgreSQL__ConnectionString", postgres.Resource.ConnectionStringExpression);
 
         // Prevent VS-injected startup hooks (BrowserRefresh, DeltaApplier, BrowserLink)
@@ -102,8 +102,8 @@ void WriteCrashEntry(string label, object data)
         options.EnvironmentVariables.Add("CrestApps__AI__Providers__Ollama__Connections__Default__Endpoint", "http://localhost:11434");
         options.EnvironmentVariables.Add("CrestApps__AI__Providers__Ollama__Connections__Default__ChatDeploymentName", ollamaModelName);
         options.EnvironmentVariables.Add("CrestApps__BlazorApp__MCP__Server__AuthenticationType", "None");
-        options.EnvironmentVariables.Add("CrestApps__BlazorApp__A2A__Host__AuthenticationType", "None");
-        options.EnvironmentVariables.Add("CrestApps__BlazorApp__A2A__Host__ExposeAgentsAsSkill", "true");
+        options.EnvironmentVariables.Add("A2AHostOptions__AuthenticationType", "None");
+        options.EnvironmentVariables.Add("A2AHostOptions__ExposeAgentsAsSkill", "true");
         options.EnvironmentVariables.Add("CrestApps__PostgreSQL__ConnectionString", postgres.Resource.ConnectionStringExpression);
 
         // Prevent VS-injected startup hooks (BrowserRefresh, DeltaApplier, BrowserLink)