add prompt files

Author: pwang347

chat-prompt-files-sample/.gitignore

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

chat-prompt-files-sample/.vscode/extensions.json

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+{
+	// See https://go.microsoft.com/fwlink/?LinkId=827846 to learn about workspace recommendations.
+	// Extension identifier format: ${publisher}.${name}. Example: vscode.csharp
+
+	// List of extensions which should be recommended for users of this workspace.
+	"recommendations": [
+		"dbaeumer.vscode-eslint"
+	]
+}

chat-prompt-files-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": [
+				"${workspaceFolder}/out/**/*.js"
+			],
+			"preLaunchTask": "npm: watch"
+		},
+		{
+			"name": "Run Extension Tests",
+			"type": "extensionHost",
+			"request": "launch",
+			"runtimeExecutable": "${execPath}",
+			"args": [
+				"--extensionDevelopmentPath=${workspaceFolder}",
+				"--extensionTestsPath=${workspaceFolder}/out/test"
+			],
+			"outFiles": [
+				"${workspaceFolder}/out/test/**/*.js"
+			],
+			"preLaunchTask": "npm: watch"
+		}
+	]
+}

chat-prompt-files-sample/.vscode/settings.json

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+{
+	"editor.insertSpaces": false
+}

chat-prompt-files-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
+			}
+		}
+	]
+}

chat-prompt-files-sample/.vscodeignore

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+.vscode/**
+.vscode-test/**
+out/test/**
+out/**/*.map
+src/**
+.gitignore
+tsconfig.json
+vsc-extension-quickstart.md

chat-prompt-files-sample/README.md

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+# Chat Prompt Files Sample
+
+Demonstrates the proposed Chat Prompt Files API to register providers for custom agents, instructions, and prompt files with dynamic content.
+
+## Features
+
+Three provider types, each with dynamic content generation:
+
+- **Custom Agent** ([customAgentProvider.ts](src/customAgentProvider.ts)) - Workspace statistics with folder names and counts
+- **Instructions** ([instructionsProvider.ts](src/instructionsProvider.ts)) - Active editor context including current file and language
+- **Prompt Files** ([promptFileProvider.ts](src/promptFileProvider.ts)) - Time-based greetings and contextual suggestions
+
+Static files are contributed via `package.json`. Providers demonstrate dynamic content using data URIs.
+
+## Running the Sample
+
+1. `npm install` to install dependencies
+2. `npm run watch` to compile
+3. `F5` to launch with the extension
+4. Open the chat panel to see the contributed prompts
+
+## API Reference
+
+- `vscode.chat.registerCustomAgentProvider()`
+- `vscode.chat.registerInstructionsProvider()`
+- `vscode.chat.registerPromptFileProvider()`

chat-prompt-files-sample/eslint.config.mjs

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+/**
+ * ESLint configuration for the project.
+ * 
+ * See https://eslint.style and https://typescript-eslint.io for additional linting options.
+ */
+// @ts-check
+import js from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import stylistic from '@stylistic/eslint-plugin';
+
+export default tseslint.config(
+	{
+		ignores: [
+			'.vscode-test',
+			'out',
+		]
+	},
+	js.configs.recommended,
+	...tseslint.configs.recommended,
+	...tseslint.configs.stylistic,
+	{
+		plugins: {
+			'@stylistic': stylistic
+		},
+		rules: {
+			'curly': 'warn',
+			'@stylistic/semi': ['warn', 'always'],
+			'@typescript-eslint/no-empty-function': 'off',
+			'@typescript-eslint/naming-convention': [
+				'warn',
+				{
+					'selector': 'import',
+					'format': ['camelCase', 'PascalCase']
+				}
+			],
+			'@typescript-eslint/no-unused-vars': [
+				'error',
+				{
+					'argsIgnorePattern': '^_'
+				}
+			]
+		}
+	}
+);