microsoft/teams.net
Publicmirrored fromhttps://github.com/microsoft/teams.netAvailable
core/samples/ExtAIBot/McpTools.cs
86lines · modecode
| 1 | // Copyright (c) Microsoft Corporation. |
| 2 | // Licensed under the MIT License. |
| 3 | |
| 4 | using Microsoft.Extensions.AI; |
| 5 | using ModelContextProtocol.Client; |
| 6 | |
| 7 | namespace ExtAIBot; |
| 8 | |
| 9 | // Owns the McpClient lifetime, lists tools at startup, and returns them wrapped |
| 10 | // with citation extraction so search results populate the CitationCollector. |
| 11 | sealed class McpToolSet : IAsyncDisposable |
| 12 | { |
| 13 | private readonly McpClient _client; |
| 14 | private readonly IList<McpClientTool> _tools; |
| 15 | private readonly ILogger<McpToolSet> _logger; |
| 16 | |
| 17 | private McpToolSet(McpClient client, IList<McpClientTool> tools, ILogger<McpToolSet> logger) |
| 18 | { |
| 19 | _client = client; |
| 20 | _tools = tools; |
| 21 | _logger = logger; |
| 22 | } |
| 23 | |
| 24 | public static async Task<McpToolSet> CreateAsync(ILogger<McpToolSet> logger, CancellationToken cancellationToken = default) |
| 25 | { |
| 26 | McpClient client = await McpClient.CreateAsync( |
| 27 | new HttpClientTransport(new HttpClientTransportOptions |
| 28 | { |
| 29 | Endpoint = new Uri("https://learn.microsoft.com/api/mcp"), |
| 30 | Name = "MSLearn", |
| 31 | TransportMode = HttpTransportMode.StreamableHttp |
| 32 | }), |
| 33 | cancellationToken: cancellationToken); |
| 34 | |
| 35 | IList<McpClientTool> tools = |
| 36 | await client.ListToolsAsync(cancellationToken: cancellationToken); |
| 37 | |
| 38 | return new McpToolSet(client, tools, logger); |
| 39 | } |
| 40 | |
| 41 | // Returns each MCP tool wrapped so its results feed into the CitationCollector. |
| 42 | public IList<AITool> GetTools(CitationCollector citations) => |
| 43 | [.. _tools.Select(t => new CitationCapturingTool(t, citations, _logger))]; |
| 44 | |
| 45 | public ValueTask DisposeAsync() => _client.DisposeAsync(); |
| 46 | } |
| 47 | |
| 48 | sealed class McpToolSetLifetimeService(ILogger<McpToolSet> logger) : IHostedService |
| 49 | { |
| 50 | private McpToolSet? _value; |
| 51 | |
| 52 | public McpToolSet Value => _value ?? throw new InvalidOperationException("MCP tool set is not initialized."); |
| 53 | |
| 54 | public async Task StartAsync(CancellationToken cancellationToken) |
| 55 | { |
| 56 | _value = await McpToolSet.CreateAsync(logger, cancellationToken); |
| 57 | } |
| 58 | |
| 59 | public async Task StopAsync(CancellationToken cancellationToken) |
| 60 | { |
| 61 | if (_value is null) return; |
| 62 | |
| 63 | await _value.DisposeAsync(); |
| 64 | _value = null; |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | // Wraps an McpClientTool, delegating all metadata to it while intercepting |
| 69 | // InvokeCoreAsync to extract citation data from the raw result string. |
| 70 | file sealed class CitationCapturingTool(McpClientTool inner, CitationCollector citations, ILogger logger) |
| 71 | : DelegatingAIFunction(inner) |
| 72 | { |
| 73 | protected override async ValueTask<object?> InvokeCoreAsync( |
| 74 | AIFunctionArguments arguments, |
| 75 | CancellationToken cancellationToken) |
| 76 | { |
| 77 | logger.LogInformation("[tool] {Name}({Args})", |
| 78 | inner.Name, |
| 79 | string.Join(", ", arguments.Select(a => $"{a.Key}={a.Value}"))); |
| 80 | |
| 81 | object? result = await inner.InvokeAsync(arguments, cancellationToken); |
| 82 | if (result?.ToString() is string text) |
| 83 | citations.TryExtract(text); |
| 84 | return result; |
| 85 | } |
| 86 | } |
| 87 | |