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Add support for custom headers in HostedMcpServerTool #7053

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Add support for custom headers in HostedMcpServerTool #7053

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7eca7b1
Add support for custom headers in HostedMcpServerTool
echapmanFromBunnings Nov 18, 2025
074df0b
Merge branch 'main' into AddHeaderToMcpToolCreation
echapmanFromBunnings Nov 22, 2025
6a19b2a
nitpick correction on code structure
echapmanFromBunnings Nov 22, 2025
6145568
Merge branch 'main' into AddHeaderToMcpToolCreation
echapmanFromBunnings Nov 25, 2025
ad14d00
Merge branch 'main' into AddHeaderToMcpToolCreation
echapmanFromBunnings Nov 26, 2025
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5 changes: 5 additions & 0 deletions src/Libraries/Microsoft.Extensions.AI.Abstractions/Tools/HostedMcpServerTool.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -99,4 +99,9 @@ private static string ValidateUrl(Uri serverUrl)
/// </para>
/// </remarks>
public HostedMcpServerToolApprovalMode? ApprovalMode { get; set; }

/// <summary>
/// Gets or sets additional headers to include in requests to the remote MCP server.
/// </summary>
public IDictionary<string, string>? Headers { get; set; }
}
4 changes: 2 additions & 2 deletions src/Libraries/Microsoft.Extensions.AI.OpenAI/OpenAIResponsesChatClient.cs
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Expand Up @@ -537,12 +537,12 @@ void IDisposable.Dispose()
mcpTool.ServerName,
url,
mcpTool.AuthorizationToken,
mcpTool.ServerDescription) :
mcpTool.ServerDescription, mcpTool.Headers) :
ResponseTool.CreateMcpTool(
mcpTool.ServerName,
new McpToolConnectorId(mcpTool.ServerAddress),
mcpTool.AuthorizationToken,
mcpTool.ServerDescription);
mcpTool.ServerDescription, mcpTool.Headers);

if (mcpTool.AllowedTools is not null)
{
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11 changes: 11 additions & 0 deletions test/Libraries/Microsoft.Extensions.AI.Abstractions.Tests/Tools/HostedMcpServerToolTests.cs
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Expand Up @@ -62,6 +62,17 @@ public void Constructor_Roundtrips()
tool.ApprovalMode = HostedMcpServerToolApprovalMode.AlwaysRequire;
Assert.Same(HostedMcpServerToolApprovalMode.AlwaysRequire, tool.ApprovalMode);

Assert.Null(tool.Headers);
IDictionary<string, string> headers = new Dictionary<string, string>
{
["X-Custom-Header"] = "value1",
};
tool.Headers = headers;
Assert.Same(headers, tool.Headers);

tool.Headers = null;
Assert.Null(tool.Headers);

var customApprovalMode = new HostedMcpServerToolRequireSpecificApprovalMode(["tool1"], ["tool2"]);
tool.ApprovalMode = customApprovalMode;
Assert.Same(customApprovalMode, tool.ApprovalMode);
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