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Microsoft.Azure.Functions.Worker.Extensions.Mcp 1.5.0

Microsoft.Azure.Functions.Worker.Extensions.Mcp

This package provides triggers and bindings to support exposing Azure Functions .NET isolated functions as a Model Context Protocol (MCP) server.

Example usage

The following is an example of how to use the MCP tool trigger in an Azure Functions application:

[Function(nameof(GetSnippet))]
public object GetSnippet(
 [McpToolTrigger(GetSnippetToolName, GetSnippetToolDescription)] ToolInvocationContext context,
 [BlobInput(BlobPath)] string snippetContent)
{
 return snippetContent;
}

You can also bind to the MCP tool property arguments using the McpToolProperty input binding as follows:

[Function(nameof(SaveSnippet))]
[BlobOutput(BlobPath)]
public string SaveSnippet(
 [McpToolTrigger(SaveSnippetToolName, SaveSnippetToolDescription)] ToolInvocationContext context,
 [McpToolProperty(SnippetNamePropertyName, PropertyType, SnippetNamePropertyDescription)] string name,
 [McpToolProperty(SnippetPropertyName, PropertyType, SnippetPropertyDescription)] string snippet)
{
 return snippet;
}

The above example will automatically expose the name and snippet parameters as properties for the MCP tool.

Alternatively, you can define properties when creating your application as follows:

// Define properties for the MCP tool:
builder.ConfigureMcpTool("SaveSnippet")
 .WithProperty(SnippetNamePropertyName, PropertyType, SnippetNamePropertyDescription);

The above example demonstrates how the properties for the tool named SaveSnippet are defined.