add extension sample for mcp server publishing (#1156)

Author: connor4312

mcp-extension-sample/.gitignore

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+out
+node_modules
+.vscode-test/
+*.vsix
+
+*.d.ts

mcp-extension-sample/.vscode/launch.json

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+// A launch configuration that compiles the extension and then opens it inside a new window
+// Use IntelliSense to learn about possible attributes.
+// Hover to view descriptions of existing attributes.
+// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+{
+	"version": "0.2.0",
+	"configurations": [{
+			"name": "Run Extension",
+			"type": "extensionHost",
+			"request": "launch",
+			"runtimeExecutable": "${execPath}",
+			"args": [
+				"--extensionDevelopmentPath=${workspaceFolder}"
+			],
+			"outFiles": [
+				"${workspaceFolder}/out/**/*.js"
+			],
+			"preLaunchTask": "npm: watch"
+		}
+	]
+}

mcp-extension-sample/.vscode/tasks.json

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+// See https://go.microsoft.com/fwlink/?LinkId=733558
+// for the documentation about the tasks.json format
+{
+	"version": "2.0.0",
+	"tasks": [
+		{
+			"type": "npm",
+			"script": "watch",
+			"problemMatcher": "$tsc-watch",
+			"isBackground": true,
+			"presentation": {
+				"reveal": "never"
+			},
+			"group": {
+				"kind": "build",
+				"isDefault": true
+			}
+		}
+	]
+}

mcp-extension-sample/README.md

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+# MCP Extension sample
+
+This sample demonstrates usage of the MCP connection API. This API is currently still proposed.
+
+## Running the Sample
+
+- Run `npm install` in terminal to install dependencies
+- A `postinstall` script would download latest version of `vscode.proposed.<proposalName>.d.ts`
+- Run the `Run Extension` target in the Debug View. This will:
+	- Start a task `npm: watch` to compile the code
+	- Run the extension in a new VS Code window
+- In the new window, run the command `Add Gist Source` command with a gist containing MCP servers ([example](https://gist.github.com/connor4312/3939ae7f6e55b2e391b5d585df27465c))
+- You can now run these MCP servers in chat.

mcp-extension-sample/package-lock.json

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+{
+	"enabledApiProposals": [
+		"mcpConfigurationProvider"
+	],
+	"name": "mcp-extension-sample",
+	"displayName": "mcp-extension-sample",
+	"description": "Sample showing how to use Proposed API",
+	"version": "0.0.1",
+	"publisher": "vscode-samples",
+	"private": true,
+	"license": "MIT",
+	"repository": "https://github.com/Microsoft/vscode-extension-samples",
+	"engines": {
+		"vscode": "^1.99.0"
+	},
+	"categories": [
+		"Other"
+	],
+	"main": "./out/extension.js",
+	"contributes": {
+		"commands": [
+			{
+				"command": "mcp-extension-sample.addGist",
+				"title": "MCP Extension Sample: Add Gist Source"
+			},
+			{
+				"command": "mcp-extension-sample.removeGist",
+				"title": "MCP Extension Sample: Remove Gist Source"
+			}
+		],
+		"modelContextServerCollections": [
+			{
+				"id": "exampleGist",
+				"label": "Github Gists"
+			}
+		]
+	},
+	"scripts": {
+		"vscode:prepublish": "npm run compile",
+		"compile": "tsc -p ./",
+		"watch": "tsc -watch -p ./",
+		"download-api": "dts dev",
+		"postdownload-api": "dts main",
+		"postinstall": "npm run download-api"
+	},
+	"devDependencies": {
+		"@types/node": "^20",
+		"@vscode/dts": "^0.4.1",
+		"typescript": "^5.8.2"
+	}
+}