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Adding MCP Tool Trigger Template #4651

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dd978e2
Adding MCP Tool Trigger Template
swapnil-nagar Sep 22, 2025
62a2e98
Updating the Node Template
swapnil-nagar Oct 22, 2025
990d983
Addresing code review comments
swapnil-nagar Oct 24, 2025
0d8a7b7
Addressing Code Review
swapnil-nagar Oct 24, 2025
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4 changes: 2 additions & 2 deletions src/Cli/func/Common/TemplatesManager.cs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
// Copyright (c) .NET Foundation. All rights reserved.
// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the MIT License. See LICENSE in the project root for license information.

using System.Reflection;
Expand Down Expand Up @@ -134,7 +134,7 @@ private static async Task<IEnumerable<Template>> GetNodeV4TemplatesJson()

public async Task Deploy(string name, string fileName, Template template)
{
if (template.Id.EndsWith("JavaScript-4.x") || template.Id.EndsWith("TypeScript-4.x"))
if (template.Id.EndsWith("JavaScript-4.x", StringComparison.OrdinalIgnoreCase) || template.Id.EndsWith("TypeScript-4.x", StringComparison.OrdinalIgnoreCase))
{
await DeployNewNodeProgrammingModel(name, fileName, template);
}
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42 changes: 42 additions & 0 deletions src/Cli/func/StaticResources/node-v4-templates.json
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Expand Up @@ -614,5 +614,47 @@
"enabledInTryMode": false,
"userPrompt": []
}
},
{
"id": "McpToolTrigger-Typescript-4.x",
"runtime": "2",
"files": {
"%functionName%.ts": "import { app, InvocationContext, output } from \"@azure/functions\";\n\nconst PROPERTY_TYPE = \"string\";\n\n// Hello function - responds with hello message\nexport async function mcpToolHello(_toolArguments:unknown, context: InvocationContext): Promise<string> {\n // Get name from the tool arguments\n const mcptoolargs = context.triggerMetadata.mcptoolargs as {\n name?: string;\n };\n const name = mcptoolargs?.name;\n\n console.info(`Hello ${name}, I am MCP Tool!`);\n\n return `Hello ${name}, I am MCP Tool!`;\n}\n\n// Register the hello tool\napp.mcpTool('hello', {\n toolName: 'hello',\n description: 'Simple hello world MCP Tool that responses with a hello message.',\n toolProperties:[\n {\n propertyName: \"name\",\n propertyType: PROPERTY_TYPE,\n description: \"Required property to identify the caller.\",\n isRequired: true,\n }],\n handler: mcpToolHello\n});"
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Template seems to be OK, but it looks like we're still pulling the old ext bundle as it does not find the binding - is the new ext bundle with mcp fully released?

[2025-10-24T00:15:31.369Z] The 'hello' function is in error: The binding type(s) 'mcpToolTrigger' were not found in the configured extension bundle. Please ensure the type is correct and the correct version of extension bundle is configured.

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Not yet, but it is in flight. We will have the bundle release early next week.

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I agree with Naren that we should not merge until bundles is fully out. I can provide approval next week after validating with bundles releases

},
"metadata": {
"defaultFunctionName": "mcpToolTrigger",
"description": "$McpToolTrigger_description",
"name": "Mcp Tool Trigger",
"language": "TypeScript",
"triggerType": "mcpToolTrigger",
"category": [
"$temp_category_core",
"$temp_category_dataProcessing"
],
"categoryStyle": "other",
"enabledInTryMode": false,
"userPrompt": []
}
},
{
"id": "McpToolTrigger-Javascript-4.x",
"runtime": "2",
"files": {
"%functionName%.js": "import { app } from \"@azure/functions\";\n\nconst PROPERTY_TYPE = \"string\";\n\n// Hello function - responds with hello message\nexport async function mcpToolHello(_toolArguments, context) {\n // Get name from the tool arguments\n const mcptoolargs = context.triggerMetadata.mcptoolargs || {};\n const name = mcptoolargs.name;\n\n console.info(`Hello ${name}, I am MCP Tool!`);\n\n return `Hello ${name}, I am MCP Tool!`;\n}\n\n// Register the hello tool\napp.mcpTool('hello', {\n toolName: 'hello',\n description: 'Simple hello world MCP Tool that responses with a hello message.',\n toolProperties: [\n {\n propertyName: \"name\",\n propertyType: PROPERTY_TYPE,\n description: \"Required property to identify the caller.\",\n isRequired: true,\n }\n ],\n handler: mcpToolHello\n});"
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Got an error with this template:

[2025-10-24T00:10:38.392Z] Worker was unable to load entry point "src/functions/mcpToolTrigger.js": Cannot use import statement outside a module
[2025-10-24T00:10:38.786Z] /Users/likasem/source/functions/azure-functions-core-tools/_testapp/src/functions/mcpToolTrigger.js:1
[2025-10-24T00:10:38.786Z] import { app } from "@azure/functions";
[2025-10-24T00:10:38.786Z] ^^^^^^
[2025-10-24T00:10:38.786Z] SyntaxError: Cannot use import statement outside a module

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I tried with the steps and those steps worked for me. Lets connect offline to resolve this.

dotnet run --project src/Cli/func -- init --script-root ./_testapp
Node
Javascript

dotnet run --project src/Cli/func -- new --script-root ./_testapp
Mcp Tool Trigger

// cd into ./_testapp

npm i
func start

},
"metadata": {
"defaultFunctionName": "mcpToolTrigger",
"description": "$McpToolTrigger_description",
"name": "Mcp Tool Trigger",
"language": "JavaScript",
"triggerType": "mcpToolTrigger",
"category": [
"$temp_category_core",
"$temp_category_dataProcessing"
],
"categoryStyle": "other",
"enabledInTryMode": false,
"userPrompt": []
}
}
]
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