Add abstraction for remote MCP servers #6664
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Pull Request Overview
This PR adds abstraction for remote MCP (Model Context Protocol) servers, providing types to represent hosted MCP server tools and their associated content types. The changes introduce new classes for configuring and interacting with remote MCP servers through AI services.
- Introduces
HostedMcpServerToolclass for representing remote MCP server configurations - Adds content types for MCP tool calls and results (
HostedMcpServerToolCallContent,HostedMcpServerToolResultContent) - Implements approval mode configuration for MCP server tool calls
Reviewed Changes
Copilot reviewed 9 out of 16 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
| src/Libraries/Microsoft.Extensions.AI.Abstractions/Tools/HostedMcpServerTool.cs | Main abstraction class for configuring hosted MCP servers with URL, approval modes, and headers |
| src/Libraries/Microsoft.Extensions.AI.Abstractions/HostedMcpServerToolApprovalMode.cs | Approval mode configuration class with Always/Never predefined modes and custom tool-specific rules |
| src/Libraries/Microsoft.Extensions.AI.Abstractions/Contents/HostedMcpServerToolCallContent.cs | Content type representing MCP tool call requests with call ID, tool name, and arguments |
| src/Libraries/Microsoft.Extensions.AI.Abstractions/Contents/HostedMcpServerToolResultContent.cs | Content type representing MCP tool call results with output and error information |
| test/Libraries/Microsoft.Extensions.AI.Abstractions.Tests/Tools/HostedMcpServerToolTests.cs | Unit tests for HostedMcpServerTool functionality |
| test/Libraries/Microsoft.Extensions.AI.Abstractions.Tests/HostedMcpServerToolApprovalModeTests.cs | Unit tests for approval mode configuration |
| test/Libraries/Microsoft.Extensions.AI.Abstractions.Tests/Contents/HostedMcpServerToolCallContentTests.cs | Unit tests for tool call content type |
| test/Libraries/Microsoft.Extensions.AI.Abstractions.Tests/Contents/HostedMcpServerToolResultContentTests.cs | Unit tests for tool result content type |
| test/Libraries/Microsoft.Extensions.AI.OpenAI.Tests/OpenAIResponseClientIntegrationTests.cs | Integration tests demonstrating MCP server usage with OpenAI client |
test/Libraries/Microsoft.Extensions.AI.OpenAI.Tests/OpenAIResponseClientIntegrationTests.cs
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src/Libraries/Microsoft.Extensions.AI.Abstractions/Tools/HostedMcpServerTool.cs
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stephentoub
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Jul 30, 2025
src/Libraries/Microsoft.Extensions.AI.Abstractions/Tools/HostedMcpServerTool.cs
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stephentoub
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src/Libraries/Microsoft.Extensions.AI.Abstractions/HostedMcpServerToolApprovalMode.cs
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stephentoub
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src/Libraries/Microsoft.Extensions.AI.Abstractions/HostedMcpServerToolApprovalMode.cs
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stephentoub
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src/Libraries/Microsoft.Extensions.AI.Abstractions/HostedMcpServerToolApprovalMode.cs
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src/Libraries/Microsoft.Extensions.AI.Abstractions/Contents/HostedMcpServerToolCallContent.cs
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stephentoub
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src/Libraries/Microsoft.Extensions.AI.Abstractions/Contents/HostedMcpServerToolCallContent.cs
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stephentoub
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src/Libraries/Microsoft.Extensions.AI.Abstractions/Contents/HostedMcpServerToolCallContent.cs
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src/Libraries/Microsoft.Extensions.AI.Abstractions/Contents/HostedMcpServerToolResultContent.cs
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jozkee
commented
Aug 4, 2025
...aries/Microsoft.Extensions.AI.Abstractions/HostedMcpServerToolRequireSpecificApprovalMode.cs
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...aries/Microsoft.Extensions.AI.Abstractions/HostedMcpServerToolRequireSpecificApprovalMode.cs
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jozkee
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Aug 19, 2025
...aries/Microsoft.Extensions.AI.Abstractions/HostedMcpServerToolRequireSpecificApprovalMode.cs
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This should be ready for another round. |
stephentoub
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Sep 3, 2025
src/Libraries/Microsoft.Extensions.AI.Abstractions/Contents/HostedMcpServerToolCallContent.cs
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src/Libraries/Microsoft.Extensions.AI.Abstractions/Contents/HostedMcpServerToolCallContent.cs
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src/Libraries/Microsoft.Extensions.AI.Abstractions/Contents/HostedMcpServerToolCallContent.cs
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src/Libraries/Microsoft.Extensions.AI.Abstractions/Tools/HostedMcpServerTool.cs
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src/Libraries/Microsoft.Extensions.AI.Abstractions/Tools/HostedMcpServerTool.cs
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src/Libraries/Microsoft.Extensions.AI.Abstractions/Tools/HostedMcpServerTool.cs
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src/Libraries/Microsoft.Extensions.AI.Abstractions/Contents/HostedMcpServerToolCallContent.cs
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src/Libraries/Microsoft.Extensions.AI.Abstractions/Tools/HostedMcpServerTool.cs
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rogerbarreto
approved these changes
Sep 8, 2025
stephentoub
approved these changes
Sep 8, 2025
jozkee
commented
Sep 8, 2025
test/Libraries/Microsoft.Extensions.AI.OpenAI.Tests/OpenAIResponseClientIntegrationTests.cs
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Thanks, @stephentoub. |
joperezr
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* Simpfliy Responses streaming handling * Add abstraction for remote MCP servers * Update MCP support to accomodate responses and approvals --------- Co-authored-by: Stephen Toub <[email protected]>
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Contributes to #6492; addresses 1. and 2.
Microsoft Reviewers: Open in CodeFlow