604 lines
26 KiB
C#
604 lines
26 KiB
C#
using Microsoft.Extensions.DependencyInjection;
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using Microsoft.Extensions.Logging;
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using ModelContextProtocol.Client;
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using ModelContextProtocol.Protocol;
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using ModelContextProtocol.Server;
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using ModelContextProtocol.Tests.Utils;
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using System.Text.Json;
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namespace ModelContextProtocol.Tests.Server;
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/// <summary>
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/// Integration tests verifying that tools report correct ToolTaskSupport values
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/// based on server configuration and method signatures.
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/// </summary>
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public class ToolTaskSupportTests : LoggedTest
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{
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public ToolTaskSupportTests(ITestOutputHelper testOutputHelper)
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: base(testOutputHelper)
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{
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}
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[Fact]
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public async Task Tools_WithoutTaskStore_ReportForbiddenTaskSupport()
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{
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// Arrange - Server without a task store
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await using var fixture = new ClientServerFixture(
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LoggerFactory,
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configureServer: builder =>
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{
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builder.WithTools([
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McpServerTool.Create(async (string input, CancellationToken ct) =>
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{
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await Task.Delay(10, ct);
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return $"Async: {input}";
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},
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new McpServerToolCreateOptions { Name = "async-tool", Description = "An async tool" }),
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McpServerTool.Create((string input) => $"Sync: {input}",
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new McpServerToolCreateOptions { Name = "sync-tool", Description = "A sync tool" })
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]);
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});
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// Act
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var tools = await fixture.Client.ListToolsAsync(cancellationToken: TestContext.Current.CancellationToken);
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// Assert - Both tools should have Forbidden task support when no task store is configured
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Assert.Equal(2, tools.Count);
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var asyncTool = tools.Single(t => t.Name == "async-tool");
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var syncTool = tools.Single(t => t.Name == "sync-tool");
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// Without a task store, async tools should still report Optional (their intrinsic capability)
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// but the server won't have tasks in capabilities. The tool itself declares its support.
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Assert.Equal(ToolTaskSupport.Optional, asyncTool.ProtocolTool.Execution?.TaskSupport);
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// Sync tools should have null Execution or Forbidden task support
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Assert.True(
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syncTool.ProtocolTool.Execution is null ||
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syncTool.ProtocolTool.Execution.TaskSupport is null ||
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syncTool.ProtocolTool.Execution.TaskSupport == ToolTaskSupport.Forbidden,
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"Sync tools should not support task execution");
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}
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[Fact]
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public async Task Tools_WithTaskStore_AsyncToolsReportOptionalTaskSupport()
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{
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// Arrange - Server with a task store
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var taskStore = new InMemoryMcpTaskStore();
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await using var fixture = new ClientServerFixture(
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LoggerFactory,
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configureServer: builder =>
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{
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builder.WithTools([
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McpServerTool.Create(async (string input, CancellationToken ct) =>
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{
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await Task.Delay(10, ct);
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return $"Async: {input}";
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},
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new McpServerToolCreateOptions { Name = "async-tool", Description = "An async tool" }),
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McpServerTool.Create((string input) => $"Sync: {input}",
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new McpServerToolCreateOptions { Name = "sync-tool", Description = "A sync tool" })
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]);
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},
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configureServices: services =>
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{
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services.AddSingleton<IMcpTaskStore>(taskStore);
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services.Configure<McpServerOptions>(options => options.TaskStore = taskStore);
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});
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// Act
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var tools = await fixture.Client.ListToolsAsync(cancellationToken: TestContext.Current.CancellationToken);
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// Assert
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Assert.Equal(2, tools.Count);
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var asyncTool = tools.Single(t => t.Name == "async-tool");
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var syncTool = tools.Single(t => t.Name == "sync-tool");
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// Async tools should report Optional task support
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Assert.Equal(ToolTaskSupport.Optional, asyncTool.ProtocolTool.Execution?.TaskSupport);
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// Sync tools should have null Execution or Forbidden task support
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Assert.True(
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syncTool.ProtocolTool.Execution is null ||
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syncTool.ProtocolTool.Execution.TaskSupport is null ||
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syncTool.ProtocolTool.Execution.TaskSupport == ToolTaskSupport.Forbidden,
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"Sync tools should not support task execution");
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}
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[Fact]
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public async Task Tools_WithExplicitTaskSupport_ReportsConfiguredValue()
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{
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// Arrange - Server with explicit task support configured on tools
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var taskStore = new InMemoryMcpTaskStore();
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await using var fixture = new ClientServerFixture(
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LoggerFactory,
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configureServer: builder =>
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{
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builder.WithTools([
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McpServerTool.Create(async (string input, CancellationToken ct) =>
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{
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await Task.Delay(10, ct);
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return $"Async: {input}";
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},
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new McpServerToolCreateOptions
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{
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Name = "required-async-tool",
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Description = "A tool that requires task execution",
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Execution = new ToolExecution { TaskSupport = ToolTaskSupport.Required }
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}),
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McpServerTool.Create((string input) => $"Sync: {input}",
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new McpServerToolCreateOptions
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{
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Name = "forbidden-sync-tool",
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Description = "A tool that forbids task execution",
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Execution = new ToolExecution { TaskSupport = ToolTaskSupport.Forbidden }
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})
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]);
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},
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configureServices: services =>
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{
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services.AddSingleton<IMcpTaskStore>(taskStore);
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services.Configure<McpServerOptions>(options => options.TaskStore = taskStore);
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});
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// Act
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var tools = await fixture.Client.ListToolsAsync(cancellationToken: TestContext.Current.CancellationToken);
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// Assert
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Assert.Equal(2, tools.Count);
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var requiredTool = tools.Single(t => t.Name == "required-async-tool");
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var forbiddenTool = tools.Single(t => t.Name == "forbidden-sync-tool");
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Assert.Equal(ToolTaskSupport.Required, requiredTool.ProtocolTool.Execution?.TaskSupport);
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Assert.Equal(ToolTaskSupport.Forbidden, forbiddenTool.ProtocolTool.Execution?.TaskSupport);
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}
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[Fact]
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public async Task ServerCapabilities_WithoutTaskStore_DoNotIncludeTasksCapability()
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{
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// Arrange - Server without a task store
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await using var fixture = new ClientServerFixture(
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LoggerFactory,
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configureServer: builder =>
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{
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builder.WithTools([
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McpServerTool.Create((string input) => $"Result: {input}",
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new McpServerToolCreateOptions { Name = "test-tool" })
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]);
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});
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// Assert - Server capabilities should not include tasks
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Assert.Null(fixture.Client.ServerCapabilities?.Tasks);
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}
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[Fact]
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public async Task ServerCapabilities_WithTaskStore_IncludeTasksCapability()
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{
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// Arrange - Server with a task store
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var taskStore = new InMemoryMcpTaskStore();
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await using var fixture = new ClientServerFixture(
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LoggerFactory,
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configureServer: builder =>
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{
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builder.WithTools([
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McpServerTool.Create((string input) => $"Result: {input}",
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new McpServerToolCreateOptions { Name = "test-tool" })
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]);
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},
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configureServices: services =>
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{
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services.Configure<McpServerOptions>(options =>
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{
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options.TaskStore = taskStore;
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});
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});
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// Assert - Server capabilities should include tasks
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Assert.NotNull(fixture.Client.ServerCapabilities?.Tasks);
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Assert.NotNull(fixture.Client.ServerCapabilities.Tasks.List);
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Assert.NotNull(fixture.Client.ServerCapabilities.Tasks.Cancel);
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Assert.NotNull(fixture.Client.ServerCapabilities.Tasks.Requests?.Tools?.Call);
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}
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#pragma warning disable MCPEXP001 // Tasks feature is experimental
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[Fact]
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public void McpServerToolAttribute_TaskSupport_CanBeSetOnAttribute()
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{
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// Test that the TaskSupport property can be set via the attribute
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// and is correctly read when creating a tool
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var tool = McpServerTool.Create(typeof(TaskSupportAttributeTestTools).GetMethod(nameof(TaskSupportAttributeTestTools.RequiredTaskTool))!);
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Assert.NotNull(tool.ProtocolTool.Execution);
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Assert.Equal(ToolTaskSupport.Required, tool.ProtocolTool.Execution.TaskSupport);
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var optionalTool = McpServerTool.Create(typeof(TaskSupportAttributeTestTools).GetMethod(nameof(TaskSupportAttributeTestTools.OptionalTaskTool))!);
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Assert.NotNull(optionalTool.ProtocolTool.Execution);
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Assert.Equal(ToolTaskSupport.Optional, optionalTool.ProtocolTool.Execution.TaskSupport);
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var forbiddenTool = McpServerTool.Create(typeof(TaskSupportAttributeTestTools).GetMethod(nameof(TaskSupportAttributeTestTools.ForbiddenTaskTool))!);
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Assert.NotNull(forbiddenTool.ProtocolTool.Execution);
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Assert.Equal(ToolTaskSupport.Forbidden, forbiddenTool.ProtocolTool.Execution.TaskSupport);
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}
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[Fact]
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public void McpServerToolAttribute_TaskSupport_WhenNotSet_AllowsAutoDetection()
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{
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// When TaskSupport is not set on the attribute, async tools should use auto-detection (Optional)
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var asyncTool = McpServerTool.Create(typeof(TaskSupportAttributeTestTools).GetMethod(nameof(TaskSupportAttributeTestTools.AsyncToolWithoutTaskSupport))!);
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Assert.NotNull(asyncTool.ProtocolTool.Execution);
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Assert.Equal(ToolTaskSupport.Optional, asyncTool.ProtocolTool.Execution.TaskSupport);
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// Sync tools without TaskSupport set should have null Execution or Forbidden
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var syncTool = McpServerTool.Create(typeof(TaskSupportAttributeTestTools).GetMethod(nameof(TaskSupportAttributeTestTools.SyncToolWithoutTaskSupport))!);
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Assert.True(
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syncTool.ProtocolTool.Execution is null ||
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syncTool.ProtocolTool.Execution.TaskSupport is null ||
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syncTool.ProtocolTool.Execution.TaskSupport == ToolTaskSupport.Forbidden,
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"Sync tools without explicit TaskSupport should not support tasks");
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}
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[Fact]
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public void McpServerToolAttribute_TaskSupport_ExplicitForbidden_OverridesAutoDetection()
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{
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// Verify that explicitly setting Forbidden overrides auto-detection for async methods
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var forbiddenAsyncTool = McpServerTool.Create(typeof(TaskSupportAttributeTestTools).GetMethod(nameof(TaskSupportAttributeTestTools.ForbiddenAsyncTool))!);
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Assert.NotNull(forbiddenAsyncTool.ProtocolTool.Execution);
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Assert.Equal(ToolTaskSupport.Forbidden, forbiddenAsyncTool.ProtocolTool.Execution.TaskSupport);
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}
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[Fact]
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public void McpServerToolAttribute_TaskSupport_OptionalOnSyncMethod_IsAllowed()
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{
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// Setting Optional on a sync method is allowed - the tool will just execute very quickly
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// This tests that the SDK doesn't prevent this configuration at tool creation time
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var tool = McpServerTool.Create(typeof(TaskSupportAttributeTestTools).GetMethod(nameof(TaskSupportAttributeTestTools.OptionalTaskTool))!);
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Assert.NotNull(tool.ProtocolTool.Execution);
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Assert.Equal(ToolTaskSupport.Optional, tool.ProtocolTool.Execution.TaskSupport);
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}
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[Fact]
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public void McpServerToolAttribute_TaskSupport_RequiredOnSyncMethod_IsAllowed()
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{
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// Setting Required on a sync method is allowed - the tool will just execute very quickly
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// This tests that the SDK doesn't prevent this configuration at tool creation time
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var tool = McpServerTool.Create(typeof(TaskSupportAttributeTestTools).GetMethod(nameof(TaskSupportAttributeTestTools.RequiredTaskTool))!);
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Assert.NotNull(tool.ProtocolTool.Execution);
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Assert.Equal(ToolTaskSupport.Required, tool.ProtocolTool.Execution.TaskSupport);
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}
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#pragma warning restore MCPEXP001
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#pragma warning disable MCPEXP001 // Tasks feature is experimental
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[Fact]
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public void McpServerToolAttribute_TaskSupport_WhenNotSet_DefaultsBasedOnMethodSignature()
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{
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// When TaskSupport is not set on the attribute, async tools should default to Optional
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var asyncTool = McpServerTool.Create(typeof(TaskSupportAttributeTestTools).GetMethod(nameof(TaskSupportAttributeTestTools.AsyncToolWithoutTaskSupport))!);
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Assert.NotNull(asyncTool.ProtocolTool.Execution);
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Assert.Equal(ToolTaskSupport.Optional, asyncTool.ProtocolTool.Execution.TaskSupport);
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// Sync tools should have null or no Execution set
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var syncTool = McpServerTool.Create(typeof(TaskSupportAttributeTestTools).GetMethod(nameof(TaskSupportAttributeTestTools.SyncToolWithoutTaskSupport))!);
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Assert.True(
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syncTool.ProtocolTool.Execution is null ||
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syncTool.ProtocolTool.Execution.TaskSupport is null ||
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syncTool.ProtocolTool.Execution.TaskSupport == ToolTaskSupport.Forbidden,
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"Sync tools without explicit TaskSupport should not support tasks");
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}
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[Theory]
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[InlineData(ToolTaskSupport.Forbidden, "\"forbidden\"")]
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[InlineData(ToolTaskSupport.Optional, "\"optional\"")]
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[InlineData(ToolTaskSupport.Required, "\"required\"")]
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public void ToolTaskSupport_SerializesToJsonCorrectly(ToolTaskSupport value, string expectedJson)
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{
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var json = JsonSerializer.Serialize(value, McpJsonUtilities.DefaultOptions);
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Assert.Equal(expectedJson, json);
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}
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[Theory]
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[InlineData("\"forbidden\"", ToolTaskSupport.Forbidden)]
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[InlineData("\"optional\"", ToolTaskSupport.Optional)]
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[InlineData("\"required\"", ToolTaskSupport.Required)]
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public void ToolTaskSupport_DeserializesFromJsonCorrectly(string json, ToolTaskSupport expected)
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{
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var value = JsonSerializer.Deserialize<ToolTaskSupport>(json, McpJsonUtilities.DefaultOptions);
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Assert.Equal(expected, value);
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}
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[Fact]
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public void ToolExecution_TaskSupport_NullByDefault()
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{
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// Verify that ToolExecution.TaskSupport is null by default
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var execution = new ToolExecution();
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Assert.Null(execution.TaskSupport);
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// When serialized with a value, it should appear correctly
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var tool = new Tool
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{
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Name = "test",
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Execution = new ToolExecution { TaskSupport = ToolTaskSupport.Optional }
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};
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var toolJson = JsonSerializer.Serialize(tool, McpJsonUtilities.DefaultOptions);
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Assert.Contains("\"optional\"", toolJson);
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}
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[Fact]
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public void McpServerToolCreateOptions_Execution_OverridesAutoDetection()
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{
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// When Execution is set via options, it should override auto-detection
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var tool = McpServerTool.Create(
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async (string input, CancellationToken ct) =>
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{
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await Task.Delay(1, ct);
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return input;
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},
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new McpServerToolCreateOptions
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{
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Name = "test",
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Execution = new ToolExecution { TaskSupport = ToolTaskSupport.Forbidden }
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});
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// Even though this is an async method, it should have Forbidden since it was explicitly set
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Assert.NotNull(tool.ProtocolTool.Execution);
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Assert.Equal(ToolTaskSupport.Forbidden, tool.ProtocolTool.Execution.TaskSupport);
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}
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[Fact]
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public void McpServerToolCreateOptions_Execution_Required_SetsCorrectly()
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{
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var tool = McpServerTool.Create(
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(string input) => input,
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new McpServerToolCreateOptions
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{
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Name = "test",
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Execution = new ToolExecution { TaskSupport = ToolTaskSupport.Required }
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});
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Assert.NotNull(tool.ProtocolTool.Execution);
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Assert.Equal(ToolTaskSupport.Required, tool.ProtocolTool.Execution.TaskSupport);
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}
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[Fact]
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public void ToolTaskSupport_EnumValues_AreCorrect()
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{
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// Verify enum values are as expected (Forbidden = 0)
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Assert.Equal(0, (int)ToolTaskSupport.Forbidden);
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Assert.Equal(1, (int)ToolTaskSupport.Optional);
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Assert.Equal(2, (int)ToolTaskSupport.Required);
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}
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[Fact]
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public void McpServerToolAttribute_TaskSupport_PublicPropertyDefaultsToForbidden()
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{
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// Verify that the public property returns Forbidden when not set
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var attr = new McpServerToolAttribute();
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Assert.Equal(ToolTaskSupport.Forbidden, attr.TaskSupport);
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}
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#pragma warning restore MCPEXP001
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[McpServerToolType]
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private static class TaskSupportAttributeTestTools
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{
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#pragma warning disable MCPEXP001 // Tasks feature is experimental
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[McpServerTool(TaskSupport = ToolTaskSupport.Required)]
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public static string RequiredTaskTool(string input) => $"Required: {input}";
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[McpServerTool(TaskSupport = ToolTaskSupport.Optional)]
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public static string OptionalTaskTool(string input) => $"Optional: {input}";
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[McpServerTool(TaskSupport = ToolTaskSupport.Forbidden)]
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public static string ForbiddenTaskTool(string input) => $"Forbidden: {input}";
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[McpServerTool(TaskSupport = ToolTaskSupport.Forbidden)]
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public static async Task<string> ForbiddenAsyncTool(string input, CancellationToken ct)
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{
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await Task.Delay(1, ct);
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return $"ForbiddenAsync: {input}";
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}
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#pragma warning restore MCPEXP001
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[McpServerTool]
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public static async Task<string> AsyncToolWithoutTaskSupport(string input, CancellationToken ct)
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{
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await Task.Delay(1, ct);
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return $"Async: {input}";
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}
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[McpServerTool]
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public static string SyncToolWithoutTaskSupport(string input) => $"Sync: {input}";
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}
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#region Sync Method with Optional/Required TaskSupport Integration Tests
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#pragma warning disable MCPEXP001 // Tasks feature is experimental
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[Fact]
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public async Task SyncTool_WithOptionalTaskSupport_CanBeCalledAsTask()
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{
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// Arrange - Server with task store and a sync tool with Optional task support
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var taskStore = new InMemoryMcpTaskStore();
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await using var fixture = new ClientServerFixture(
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LoggerFactory,
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configureServer: builder =>
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{
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builder.WithTools([McpServerTool.Create(
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(string input) => $"Sync result: {input}",
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new McpServerToolCreateOptions
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{
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Name = "optional-sync-tool",
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Description = "A sync tool with optional task support",
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Execution = new ToolExecution { TaskSupport = ToolTaskSupport.Optional }
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})]);
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},
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configureServices: services =>
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{
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services.AddSingleton<IMcpTaskStore>(taskStore);
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services.Configure<McpServerOptions>(options => options.TaskStore = taskStore);
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});
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// Act - Call the sync tool as a task
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var mcpTask = await fixture.Client.CallToolAsTaskAsync(
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"optional-sync-tool",
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arguments: new Dictionary<string, object?> { ["input"] = "test" },
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taskMetadata: new McpTaskMetadata(),
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progress: null,
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cancellationToken: TestContext.Current.CancellationToken);
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// Assert - Task was created successfully
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Assert.NotNull(mcpTask);
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Assert.NotEmpty(mcpTask.TaskId);
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}
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[Fact]
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public async Task SyncTool_WithRequiredTaskSupport_CanBeCalledAsTask()
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{
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// Arrange - Server with task store and a sync tool with Required task support
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var taskStore = new InMemoryMcpTaskStore();
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await using var fixture = new ClientServerFixture(
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LoggerFactory,
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configureServer: builder =>
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{
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builder.WithTools([McpServerTool.Create(
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(string input) => $"Sync result: {input}",
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new McpServerToolCreateOptions
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{
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Name = "required-sync-tool",
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Description = "A sync tool with required task support",
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Execution = new ToolExecution { TaskSupport = ToolTaskSupport.Required }
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})]);
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},
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configureServices: services =>
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{
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services.AddSingleton<IMcpTaskStore>(taskStore);
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services.Configure<McpServerOptions>(options => options.TaskStore = taskStore);
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});
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// Act - Call the sync tool as a task
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var mcpTask = await fixture.Client.CallToolAsTaskAsync(
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"required-sync-tool",
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arguments: new Dictionary<string, object?> { ["input"] = "test" },
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taskMetadata: new McpTaskMetadata(),
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progress: null,
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cancellationToken: TestContext.Current.CancellationToken);
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// Assert - Task was created successfully
|
|
Assert.NotNull(mcpTask);
|
|
Assert.NotEmpty(mcpTask.TaskId);
|
|
}
|
|
|
|
[Fact]
|
|
public async Task SyncTool_WithRequiredTaskSupport_CannotBeCalledDirectly()
|
|
{
|
|
// Arrange - Server with task store and a sync tool with Required task support
|
|
var taskStore = new InMemoryMcpTaskStore();
|
|
|
|
await using var fixture = new ClientServerFixture(
|
|
LoggerFactory,
|
|
configureServer: builder =>
|
|
{
|
|
builder.WithTools([McpServerTool.Create(
|
|
(string input) => $"Sync result: {input}",
|
|
new McpServerToolCreateOptions
|
|
{
|
|
Name = "required-sync-tool",
|
|
Description = "A sync tool with required task support",
|
|
Execution = new ToolExecution { TaskSupport = ToolTaskSupport.Required }
|
|
})]);
|
|
},
|
|
configureServices: services =>
|
|
{
|
|
services.AddSingleton<IMcpTaskStore>(taskStore);
|
|
services.Configure<McpServerOptions>(options => options.TaskStore = taskStore);
|
|
});
|
|
|
|
// Act & Assert - Calling directly should fail because task execution is required
|
|
var exception = await Assert.ThrowsAsync<McpProtocolException>(() =>
|
|
fixture.Client.CallToolAsync(
|
|
"required-sync-tool",
|
|
arguments: new Dictionary<string, object?> { ["input"] = "test" },
|
|
cancellationToken: TestContext.Current.CancellationToken).AsTask());
|
|
|
|
// The server returns MethodNotFound because direct invocation is not allowed for required-task tools
|
|
Assert.Equal(McpErrorCode.MethodNotFound, exception.ErrorCode);
|
|
Assert.Contains("task", exception.Message, StringComparison.OrdinalIgnoreCase);
|
|
}
|
|
#pragma warning restore MCPEXP001
|
|
|
|
#endregion
|
|
|
|
/// <summary>
|
|
/// A fixture that creates a connected MCP client-server pair for testing.
|
|
/// </summary>
|
|
private sealed class ClientServerFixture : IAsyncDisposable
|
|
{
|
|
private readonly System.IO.Pipelines.Pipe _clientToServerPipe = new();
|
|
private readonly System.IO.Pipelines.Pipe _serverToClientPipe = new();
|
|
private readonly CancellationTokenSource _cts;
|
|
private readonly Task _serverTask;
|
|
private readonly IServiceProvider _serviceProvider;
|
|
|
|
public McpClient Client { get; }
|
|
public McpServer Server { get; }
|
|
|
|
public ClientServerFixture(
|
|
ILoggerFactory loggerFactory,
|
|
Action<IMcpServerBuilder>? configureServer,
|
|
Action<IServiceCollection>? configureServices = null)
|
|
{
|
|
ServiceCollection sc = new();
|
|
sc.AddLogging();
|
|
|
|
var builder = sc
|
|
.AddMcpServer()
|
|
.WithStreamServerTransport(_clientToServerPipe.Reader.AsStream(), _serverToClientPipe.Writer.AsStream());
|
|
|
|
configureServer?.Invoke(builder);
|
|
configureServices?.Invoke(sc);
|
|
|
|
_serviceProvider = sc.BuildServiceProvider(validateScopes: true);
|
|
_cts = CancellationTokenSource.CreateLinkedTokenSource(TestContext.Current.CancellationToken);
|
|
|
|
Server = _serviceProvider.GetRequiredService<McpServer>();
|
|
_serverTask = Server.RunAsync(_cts.Token);
|
|
|
|
// Create client synchronously by blocking - this is test code
|
|
Client = McpClient.CreateAsync(
|
|
new StreamClientTransport(
|
|
serverInput: _clientToServerPipe.Writer.AsStream(),
|
|
_serverToClientPipe.Reader.AsStream(),
|
|
loggerFactory),
|
|
loggerFactory: loggerFactory,
|
|
cancellationToken: TestContext.Current.CancellationToken).GetAwaiter().GetResult();
|
|
}
|
|
|
|
public async ValueTask DisposeAsync()
|
|
{
|
|
await Client.DisposeAsync();
|
|
await _cts.CancelAsync();
|
|
|
|
_clientToServerPipe.Writer.Complete();
|
|
_serverToClientPipe.Writer.Complete();
|
|
|
|
await _serverTask;
|
|
|
|
if (_serviceProvider is IAsyncDisposable asyncDisposable)
|
|
{
|
|
await asyncDisposable.DisposeAsync();
|
|
}
|
|
else if (_serviceProvider is IDisposable disposable)
|
|
{
|
|
disposable.Dispose();
|
|
}
|
|
|
|
_cts.Dispose();
|
|
}
|
|
}
|
|
}
|