diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
index 9e1a927305..976583d6e0 100644
--- a/.github/copilot-instructions.md
+++ b/.github/copilot-instructions.md
@@ -1,59 +1,45 @@
 ---
-description: PowerToys AI contributor guidance.
-applyTo: pullRequests
+description: 'PowerToys AI contributor guidance'
 ---
 
-# PowerToys - Copilot guide (concise)
+# PowerToys – Copilot Instructions
 
-This is the top-level guide for AI changes. Keep edits small, follow existing patterns, and cite exact paths in PRs.
+Concise guidance for AI contributions. For complete details, see [AGENTS.md](../AGENTS.md).
 
-# Repo map (1-line per area)
-- Core apps: `src/runner/**` (tray/loader), `src/settings-ui/**` (Settings app)
-- Shared libs: `src/common/**`
-- Modules: `src/modules/*` (one per utility; Command Palette in `src/modules/cmdpal/**`)
-- Build tools/docs: `tools/**`, `doc/devdocs/**`
+## Quick Reference
 
-# Build and test (defaults)
-- Prerequisites: Visual Studio 2022 17.4+, minimal Windows 10 1803+.
-- Build discipline:
-  - One terminal per operation (build -> test). Do not switch or open new ones mid-flow.
-  - After making changes, `cd` to the project folder that changed (`.csproj`/`.vcxproj`).
-  - Use scripts to build, synchronously block and wait in foreground for completion: `tools/build/build.ps1|.cmd` (current folder), `build-essentials.*` (once per brand new build for missing nuget packages).
-  - Treat build exit code 0 as success; any non-zero exit code is a failure. Read the errors log in the build folder (such as `build.*.*.errors.log`) and surface problems.
-  - Do not start tests or launch Runner until the previous step succeeded.
-- Tests (fast and targeted):
-  - Find the test project by product code prefix (for example FancyZones, AdvancedPaste). Look for a sibling folder or one to two levels up named like `<Product>*UnitTests` or `<Product>*UITests`.
-  - Build the test project, wait for exit, then run only those tests via VS Test Explorer or `vstest.console.exe` with filters. Avoid `dotnet test` in this repo.
-  - Add or adjust tests when changing behavior; if skipped, state why (for example comment-only or string rename).
+- **Build**: `tools\build\build-essentials.cmd` (first time), then `tools\build\build.cmd`
+- **Tests**: Find `<Product>*UnitTests` project, build it, run via VS Test Explorer
+- **Exit code 0 = success** – do not proceed if build fails
 
-# Pull requests (expectations)
-- Atomic: one logical change; no drive-by refactors.
-- Describe: problem, approach, risk, test evidence.
-- List: touched paths if not obvious.
+## Key Rules
 
-# When to ask for clarification
-- Ambiguous spec after scanning relevant docs (see below).
-- Cross-module impact (shared enum or struct) not clear.
-- Security, elevation, or installer changes.
+- One terminal per operation (build → test)
+- Atomic PRs: one logical change, no drive-by refactors
+- Add tests when changing behavior
+- Keep hot paths quiet (no logging in hooks/tight loops)
 
-# Logging (use existing stacks)
-- C++ logging lives in `src/common/logger/**` (`Logger::info`, `Logger::warn`, `Logger::error`, `Logger::debug`). Keep hot paths quiet (hooks, tight loops).
-- C# logging goes through `ManagedCommon.Logger` (`LogInfo`, `LogWarning`, `LogError`, `LogDebug`, `LogTrace`). Some UIs use injected `ILogger` via `LoggerInstance.Logger`.
+## Style Enforcement
 
-# Docs to consult
-- `tools/build/BUILD-GUIDELINES.md`
-- `doc/devdocs/core/architecture.md`
-- `doc/devdocs/core/runner.md`
-- `doc/devdocs/core/settings/readme.md`
-- `doc/devdocs/modules/readme.md`
+- C#: `src/.editorconfig`, StyleCop.Analyzers
+- C++: `src/.clang-format`
+- XAML: XamlStyler
 
-# Language style rules
-- Always enforce repo analyzers: `src/.editorconfig` plus any `stylecop.json`.
-- C# code follows StyleCop.Analyzers and Microsoft.CodeAnalysis.NetAnalyzers.
-- C++ code honors `src/.clang-format` for formatting.
-- Markdown files wrap at 80 characters and use ATX headers with fenced code blocks that include language tags.
-- YAML files indent two spaces and add comments for complex settings while keeping keys clear.
-- PowerShell scripts use Verb-Noun names and prefer single-quoted literals while documenting parameters and satisfying PSScriptAnalyzer.
+## When to Ask for Clarification
 
-# Done checklist (self review before finishing)
-- Build clean? Tests updated or passed? No unintended formatting? Any new dependency? Documented skips?
+- Ambiguous spec after scanning docs
+- Cross-module impact unclear
+- Security, elevation, or installer changes
+
+## Component-Specific Instructions
+
+These are auto-applied based on file location:
+- [Runner & Settings UI](.github/instructions/runner-settings-ui.instructions.md)
+- [Common Libraries](.github/instructions/common-libraries.instructions.md)
+
+## Detailed Documentation
+
+- [AGENTS.md](../AGENTS.md) – Full contributor guide
+- [Build Guidelines](../tools/build/BUILD-GUIDELINES.md)
+- [Architecture](../doc/devdocs/core/architecture.md)
+- [Coding Style](../doc/devdocs/development/style.md)
diff --git a/.github/instructions/agents.instructions.md b/.github/instructions/agents.instructions.md
new file mode 100644
index 0000000000..8d602c8816
--- /dev/null
+++ b/.github/instructions/agents.instructions.md
@@ -0,0 +1,791 @@
+---
+description: 'Guidelines for creating custom agent files for GitHub Copilot'
+applyTo: '**/*.agent.md'
+---
+
+# Custom Agent File Guidelines
+
+Instructions for creating effective and maintainable custom agent files that provide specialized expertise for specific development tasks in GitHub Copilot.
+
+## Project Context
+
+- Target audience: Developers creating custom agents for GitHub Copilot
+- File format: Markdown with YAML frontmatter
+- File naming convention: lowercase with hyphens (e.g., `test-specialist.agent.md`)
+- Location: `.github/agents/` directory (repository-level) or `agents/` directory (organization/enterprise-level)
+- Purpose: Define specialized agents with tailored expertise, tools, and instructions for specific tasks
+- Official documentation: https://docs.github.com/en/copilot/how-tos/use-copilot-agents/coding-agent/create-custom-agents
+
+## Required Frontmatter
+
+Every agent file must include YAML frontmatter with the following fields:
+
+```yaml
+---
+description: 'Brief description of the agent purpose and capabilities'
+name: 'Agent Display Name'
+tools: ['read', 'edit', 'search']
+model: 'Claude Sonnet 4.5'
+target: 'vscode'
+infer: true
+---
+```
+
+### Core Frontmatter Properties
+
+#### **description** (REQUIRED)
+- Single-quoted string, clearly stating the agent's purpose and domain expertise
+- Should be concise (50-150 characters) and actionable
+- Example: `'Focuses on test coverage, quality, and testing best practices'`
+
+#### **name** (OPTIONAL)
+- Display name for the agent in the UI
+- If omitted, defaults to filename (without `.md` or `.agent.md`)
+- Use title case and be descriptive
+- Example: `'Testing Specialist'`
+
+#### **tools** (OPTIONAL)
+- List of tool names or aliases the agent can use
+- Supports comma-separated string or YAML array format
+- If omitted, agent has access to all available tools
+- See "Tool Configuration" section below for details
+
+#### **model** (STRONGLY RECOMMENDED)
+- Specifies which AI model the agent should use
+- Supported in VS Code, JetBrains IDEs, Eclipse, and Xcode
+- Example: `'Claude Sonnet 4.5'`, `'gpt-4'`, `'gpt-4o'`
+- Choose based on agent complexity and required capabilities
+
+#### **target** (OPTIONAL)
+- Specifies target environment: `'vscode'` or `'github-copilot'`
+- If omitted, agent is available in both environments
+- Use when agent has environment-specific features
+
+#### **infer** (OPTIONAL)
+- Boolean controlling whether Copilot can automatically use this agent based on context
+- Default: `true` if omitted
+- Set to `false` to require manual agent selection
+
+#### **metadata** (OPTIONAL, GitHub.com only)
+- Object with name-value pairs for agent annotation
+- Example: `metadata: { category: 'testing', version: '1.0' }`
+- Not supported in VS Code
+
+#### **mcp-servers** (OPTIONAL, Organization/Enterprise only)
+- Configure MCP servers available only to this agent
+- Only supported for organization/enterprise level agents
+- See "MCP Server Configuration" section below
+
+## Tool Configuration
+
+### Tool Specification Strategies
+
+**Enable all tools** (default):
+```yaml
+# Omit tools property entirely, or use:
+tools: ['*']
+```
+
+**Enable specific tools**:
+```yaml
+tools: ['read', 'edit', 'search', 'execute']
+```
+
+**Enable MCP server tools**:
+```yaml
+tools: ['read', 'edit', 'github/*', 'playwright/navigate']
+```
+
+**Disable all tools**:
+```yaml
+tools: []
+```
+
+### Standard Tool Aliases
+
+All aliases are case-insensitive:
+
+| Alias | Alternative Names | Category | Description |
+|-------|------------------|----------|-------------|
+| `execute` | shell, Bash, powershell | Shell execution | Execute commands in appropriate shell |
+| `read` | Read, NotebookRead, view | File reading | Read file contents |
+| `edit` | Edit, MultiEdit, Write, NotebookEdit | File editing | Edit and modify files |
+| `search` | Grep, Glob, search | Code search | Search for files or text in files |
+| `agent` | custom-agent, Task | Agent invocation | Invoke other custom agents |
+| `web` | WebSearch, WebFetch | Web access | Fetch web content and search |
+| `todo` | TodoWrite | Task management | Create and manage task lists (VS Code only) |
+
+### Built-in MCP Server Tools
+
+**GitHub MCP Server**:
+```yaml
+tools: ['github/*']  # All GitHub tools
+tools: ['github/get_file_contents', 'github/search_repositories']  # Specific tools
+```
+- All read-only tools available by default
+- Token scoped to source repository
+
+**Playwright MCP Server**:
+```yaml
+tools: ['playwright/*']  # All Playwright tools
+tools: ['playwright/navigate', 'playwright/screenshot']  # Specific tools
+```
+- Configured to access localhost only
+- Useful for browser automation and testing
+
+### Tool Selection Best Practices
+
+- **Principle of Least Privilege**: Only enable tools necessary for the agent's purpose
+- **Security**: Limit `execute` access unless explicitly required
+- **Focus**: Fewer tools = clearer agent purpose and better performance
+- **Documentation**: Comment why specific tools are required for complex configurations
+
+## Sub-Agent Invocation (Agent Orchestration)
+
+Agents can invoke other agents using `runSubagent` to orchestrate multi-step workflows.
+
+### How It Works
+
+Include `agent` in tools list to enable sub-agent invocation:
+
+```yaml
+tools: ['read', 'edit', 'search', 'agent']
+```
+
+Then invoke other agents with `runSubagent`:
+
+```javascript
+const result = await runSubagent({
+  description: 'What this step does',
+  prompt: `You are the [Specialist] specialist.
+
+Context:
+- Parameter: ${parameterValue}
+- Input: ${inputPath}
+- Output: ${outputPath}
+
+Task:
+1. Do the specific work
+2. Write results to output location
+3. Return summary of completion`
+});
+```
+
+### Basic Pattern
+
+Structure each sub-agent call with:
+
+1. **description**: Clear one-line purpose of the sub-agent invocation
+2. **prompt**: Detailed instructions with substituted variables
+
+The prompt should include:
+- Who the sub-agent is (specialist role)
+- What context it needs (parameters, paths)
+- What to do (concrete tasks)
+- Where to write output
+- What to return (summary)
+
+### Example: Multi-Step Processing
+
+```javascript
+// Step 1: Process data
+const processing = await runSubagent({
+  description: 'Transform raw input data',
+  prompt: `You are the Data Processor specialist.
+
+Project: ${projectName}
+Input: ${basePath}/raw/
+Output: ${basePath}/processed/
+
+Task:
+1. Read all files from input directory
+2. Apply transformations
+3. Write processed files to output
+4. Create summary: ${basePath}/processed/summary.md
+
+Return: Number of files processed and any issues found`
+});
+
+// Step 2: Analyze (depends on Step 1)
+const analysis = await runSubagent({
+  description: 'Analyze processed data',
+  prompt: `You are the Data Analyst specialist.
+
+Project: ${projectName}
+Input: ${basePath}/processed/
+Output: ${basePath}/analysis/
+
+Task:
+1. Read processed files from input
+2. Generate analysis report
+3. Write to: ${basePath}/analysis/report.md
+
+Return: Key findings and identified patterns`
+});
+```
+
+### Key Points
+
+- **Pass variables in prompts**: Use `${variableName}` for all dynamic values
+- **Keep prompts focused**: Clear, specific tasks for each sub-agent
+- **Return summaries**: Each sub-agent should report what it accomplished
+- **Sequential execution**: Use `await` to maintain order when steps depend on each other
+- **Error handling**: Check results before proceeding to dependent steps
+
+### ⚠️ Tool Availability Requirement
+
+**Critical**: If a sub-agent requires specific tools (e.g., `edit`, `execute`, `search`), the orchestrator must include those tools in its own `tools` list. Sub-agents cannot access tools that aren't available to their parent orchestrator.
+
+**Example**:
+```yaml
+# If your sub-agents need to edit files, execute commands, or search code
+tools: ['read', 'edit', 'search', 'execute', 'agent']
+```
+
+The orchestrator's tool permissions act as a ceiling for all invoked sub-agents. Plan your tool list carefully to ensure all sub-agents have the tools they need.
+
+### ⚠️ Important Limitation
+
+**Sub-agent orchestration is NOT suitable for large-scale data processing.** Avoid using `runSubagent` when:
+- Processing hundreds or thousands of files
+- Handling large datasets
+- Performing bulk transformations on big codebases
+- Orchestrating more than 5-10 sequential steps
+
+Each sub-agent call adds latency and context overhead. For high-volume processing, implement logic directly in a single agent instead. Use orchestration only for coordinating specialized tasks on focused, manageable datasets.
+
+## Agent Prompt Structure
+
+The markdown content below the frontmatter defines the agent's behavior, expertise, and instructions. Well-structured prompts typically include:
+
+1. **Agent Identity and Role**: Who the agent is and its primary role
+2. **Core Responsibilities**: What specific tasks the agent performs
+3. **Approach and Methodology**: How the agent works to accomplish tasks
+4. **Guidelines and Constraints**: What to do/avoid and quality standards
+5. **Output Expectations**: Expected output format and quality
+
+### Prompt Writing Best Practices
+
+- **Be Specific and Direct**: Use imperative mood ("Analyze", "Generate"); avoid vague terms
+- **Define Boundaries**: Clearly state scope limits and constraints
+- **Include Context**: Explain domain expertise and reference relevant frameworks
+- **Focus on Behavior**: Describe how the agent should think and work
+- **Use Structured Format**: Headers, bullets, and lists make prompts scannable
+
+## Variable Definition and Extraction
+
+Agents can define dynamic parameters to extract values from user input and use them throughout the agent's behavior and sub-agent communications. This enables flexible, context-aware agents that adapt to user-provided data.
+
+### When to Use Variables
+
+**Use variables when**:
+- Agent behavior depends on user input
+- Need to pass dynamic values to sub-agents
+- Want to make agents reusable across different contexts
+- Require parameterized workflows
+- Need to track or reference user-provided context
+
+**Examples**:
+- Extract project name from user prompt
+- Capture certification name for pipeline processing
+- Identify file paths or directories
+- Extract configuration options
+- Parse feature names or module identifiers
+
+### Variable Declaration Pattern
+
+Define variables section early in the agent prompt to document expected parameters:
+
+```markdown
+# Agent Name
+
+## Dynamic Parameters
+
+- **Parameter Name**: Description and usage
+- **Another Parameter**: How it's extracted and used
+
+## Your Mission
+
+Process [PARAMETER_NAME] to accomplish [task].
+```
+
+### Variable Extraction Methods
+
+#### 1. **Explicit User Input**
+Ask the user to provide the variable if not detected in the prompt:
+
+```markdown
+## Your Mission
+
+Process the project by analyzing your codebase.
+
+### Step 1: Identify Project
+If no project name is provided, **ASK THE USER** for:
+- Project name or identifier
+- Base path or directory location
+- Configuration type (if applicable)
+
+Use this information to contextualize all subsequent tasks.
+```
+
+#### 2. **Implicit Extraction from Prompt**
+Automatically extract variables from the user's natural language input:
+
+```javascript
+// Example: Extract certification name from user input
+const userInput = "Process My Certification";
+
+// Extract key information
+const certificationName = extractCertificationName(userInput);
+// Result: "My Certification"
+
+const basePath = `certifications/${certificationName}`;
+// Result: "certifications/My Certification"
+```
+
+#### 3. **Contextual Variable Resolution**
+Use file context or workspace information to derive variables:
+
+```markdown
+## Variable Resolution Strategy
+
+1. **From User Prompt**: First, look for explicit mentions in user input
+2. **From File Context**: Check current file name or path
+3. **From Workspace**: Use workspace folder or active project
+4. **From Settings**: Reference configuration files
+5. **Ask User**: If all else fails, request missing information
+```
+
+### Using Variables in Agent Prompts
+
+#### Variable Substitution in Instructions
+
+Use template variables in agent prompts to make them dynamic:
+
+```markdown
+# Agent Name
+
+## Dynamic Parameters
+- **Project Name**: ${projectName}
+- **Base Path**: ${basePath}
+- **Output Directory**: ${outputDir}
+
+## Your Mission
+
+Process the **${projectName}** project located at `${basePath}`.
+
+## Process Steps
+
+1. Read input from: `${basePath}/input/`
+2. Process files according to project configuration
+3. Write results to: `${outputDir}/`
+4. Generate summary report
+
+## Quality Standards
+
+- Maintain project-specific coding standards for **${projectName}**
+- Follow directory structure: `${basePath}/[structure]`
+```
+
+#### Passing Variables to Sub-Agents
+
+When invoking a sub-agent, pass all context through template variables in the prompt:
+
+```javascript
+// Extract and prepare variables
+const basePath = `projects/${projectName}`;
+const inputPath = `${basePath}/src/`;
+const outputPath = `${basePath}/docs/`;
+
+// Pass to sub-agent with all variables substituted
+const result = await runSubagent({
+  description: 'Generate project documentation',
+  prompt: `You are the Documentation specialist.
+
+Project: ${projectName}
+Input: ${inputPath}
+Output: ${outputPath}
+
+Task:
+1. Read source files from ${inputPath}
+2. Generate comprehensive documentation
+3. Write to ${outputPath}/index.md
+4. Include code examples and usage guides
+
+Return: Summary of documentation generated (file count, word count)`
+});
+```
+
+The sub-agent receives all necessary context embedded in the prompt. Variables are resolved before sending the prompt, so the sub-agent works with concrete paths and values, not variable placeholders.
+
+### Real-World Example: Code Review Orchestrator
+
+Example of a simple orchestrator that validates code through multiple specialized agents:
+
+```javascript
+async function reviewCodePipeline(repositoryName, prNumber) {
+  const basePath = `projects/${repositoryName}/pr-${prNumber}`;
+
+  // Step 1: Security Review
+  const security = await runSubagent({
+    description: 'Scan for security vulnerabilities',
+    prompt: `You are the Security Reviewer specialist.
+
+Repository: ${repositoryName}
+PR: ${prNumber}
+Code: ${basePath}/changes/
+
+Task:
+1. Scan code for OWASP Top 10 vulnerabilities
+2. Check for injection attacks, auth flaws
+3. Write findings to ${basePath}/security-review.md
+
+Return: List of critical, high, and medium issues found`
+  });
+
+  // Step 2: Test Coverage Check
+  const coverage = await runSubagent({
+    description: 'Verify test coverage for changes',
+    prompt: `You are the Test Coverage specialist.
+
+Repository: ${repositoryName}
+PR: ${prNumber}
+Changes: ${basePath}/changes/
+
+Task:
+1. Analyze code coverage for modified files
+2. Identify untested critical paths
+3. Write report to ${basePath}/coverage-report.md
+
+Return: Current coverage percentage and gaps`
+  });
+
+  // Step 3: Aggregate Results
+  const finalReport = await runSubagent({
+    description: 'Compile all review findings',
+    prompt: `You are the Review Aggregator specialist.
+
+Repository: ${repositoryName}
+Reports: ${basePath}/*.md
+
+Task:
+1. Read all review reports from ${basePath}/
+2. Synthesize findings into single report
+3. Determine overall verdict (APPROVE/NEEDS_FIXES/BLOCK)
+4. Write to ${basePath}/final-review.md
+
+Return: Final verdict and executive summary`
+  });
+
+  return finalReport;
+}
+```
+
+This pattern applies to any orchestration scenario: extract variables, call sub-agents with clear context, await results.
+
+
+### Variable Best Practices
+
+#### 1. **Clear Documentation**
+Always document what variables are expected:
+
+```markdown
+## Required Variables
+- **projectName**: The name of the project (string, required)
+- **basePath**: Root directory for project files (path, required)
+
+## Optional Variables
+- **mode**: Processing mode - quick/standard/detailed (enum, default: standard)
+- **outputFormat**: Output format - markdown/json/html (enum, default: markdown)
+
+## Derived Variables
+- **outputDir**: Automatically set to ${basePath}/output
+- **logFile**: Automatically set to ${basePath}/.log.md
+```
+
+#### 2. **Consistent Naming**
+Use consistent variable naming conventions:
+
+```javascript
+// Good: Clear, descriptive naming
+const variables = {
+  projectName,          // What project to work on
+  basePath,            // Where project files are located
+  outputDirectory,     // Where to save results
+  processingMode,      // How to process (detail level)
+  configurationPath    // Where config files are
+};
+
+// Avoid: Ambiguous or inconsistent
+const bad_variables = {
+  name,     // Too generic
+  path,     // Unclear which path
+  mode,     // Too short
+  config    // Too vague
+};
+```
+
+#### 3. **Validation and Constraints**
+Document valid values and constraints:
+
+```markdown
+## Variable Constraints
+
+**projectName**:
+- Type: string (alphanumeric, hyphens, underscores allowed)
+- Length: 1-100 characters
+- Required: yes
+- Pattern: `/^[a-zA-Z0-9_-]+$/`
+
+**processingMode**:
+- Type: enum
+- Valid values: "quick" (< 5min), "standard" (5-15min), "detailed" (15+ min)
+- Default: "standard"
+- Required: no
+```
+
+## MCP Server Configuration (Organization/Enterprise Only)
+
+MCP servers extend agent capabilities with additional tools. Only supported for organization and enterprise-level agents.
+
+### Configuration Format
+
+```yaml
+---
+name: my-custom-agent
+description: 'Agent with MCP integration'
+tools: ['read', 'edit', 'custom-mcp/tool-1']
+mcp-servers:
+  custom-mcp:
+    type: 'local'
+    command: 'some-command'
+    args: ['--arg1', '--arg2']
+    tools: ["*"]
+    env:
+      ENV_VAR_NAME: ${{ secrets.API_KEY }}
+---
+```
+
+### MCP Server Properties
+
+- **type**: Server type (`'local'` or `'stdio'`)
+- **command**: Command to start the MCP server
+- **args**: Array of command arguments
+- **tools**: Tools to enable from this server (`["*"]` for all)
+- **env**: Environment variables (supports secrets)
+
+### Environment Variables and Secrets
+
+Secrets must be configured in repository settings under "copilot" environment.
+
+**Supported syntax**:
+```yaml
+env:
+  # Environment variable only
+  VAR_NAME: COPILOT_MCP_ENV_VAR_VALUE
+
+  # Variable with header
+  VAR_NAME: $COPILOT_MCP_ENV_VAR_VALUE
+  VAR_NAME: ${COPILOT_MCP_ENV_VAR_VALUE}
+
+  # GitHub Actions-style (YAML only)
+  VAR_NAME: ${{ secrets.COPILOT_MCP_ENV_VAR_VALUE }}
+  VAR_NAME: ${{ var.COPILOT_MCP_ENV_VAR_VALUE }}
+```
+
+## File Organization and Naming
+
+### Repository-Level Agents
+- Location: `.github/agents/`
+- Scope: Available only in the specific repository
+- Access: Uses repository-configured MCP servers
+
+### Organization/Enterprise-Level Agents
+- Location: `.github-private/agents/` (then move to `agents/` root)
+- Scope: Available across all repositories in org/enterprise
+- Access: Can configure dedicated MCP servers
+
+### Naming Conventions
+- Use lowercase with hyphens: `test-specialist.agent.md`
+- Name should reflect agent purpose
+- Filename becomes default agent name (if `name` not specified)
+- Allowed characters: `.`, `-`, `_`, `a-z`, `A-Z`, `0-9`
+
+## Agent Processing and Behavior
+
+### Versioning
+- Based on Git commit SHAs for the agent file
+- Create branches/tags for different agent versions
+- Instantiated using latest version for repository/branch
+- PR interactions use same agent version for consistency
+
+### Name Conflicts
+Priority (highest to lowest):
+1. Repository-level agent
+2. Organization-level agent
+3. Enterprise-level agent
+
+Lower-level configurations override higher-level ones with the same name.
+
+### Tool Processing
+- `tools` list filters available tools (built-in and MCP)
+- No tools specified = all tools enabled
+- Empty list (`[]`) = all tools disabled
+- Specific list = only those tools enabled
+- Unrecognized tool names are ignored (allows environment-specific tools)
+
+### MCP Server Processing Order
+1. Out-of-the-box MCP servers (e.g., GitHub MCP)
+2. Custom agent MCP configuration (org/enterprise only)
+3. Repository-level MCP configurations
+
+Each level can override settings from previous levels.
+
+## Agent Creation Checklist
+
+### Frontmatter
+- [ ] `description` field present and descriptive (50-150 chars)
+- [ ] `description` wrapped in single quotes
+- [ ] `name` specified (optional but recommended)
+- [ ] `tools` configured appropriately (or intentionally omitted)
+- [ ] `model` specified for optimal performance
+- [ ] `target` set if environment-specific
+- [ ] `infer` set to `false` if manual selection required
+
+### Prompt Content
+- [ ] Clear agent identity and role defined
+- [ ] Core responsibilities listed explicitly
+- [ ] Approach and methodology explained
+- [ ] Guidelines and constraints specified
+- [ ] Output expectations documented
+- [ ] Examples provided where helpful
+- [ ] Instructions are specific and actionable
+- [ ] Scope and boundaries clearly defined
+- [ ] Total content under 30,000 characters
+
+### File Structure
+- [ ] Filename follows lowercase-with-hyphens convention
+- [ ] File placed in correct directory (`.github/agents/` or `agents/`)
+- [ ] Filename uses only allowed characters
+- [ ] File extension is `.agent.md`
+
+### Quality Assurance
+- [ ] Agent purpose is unique and not duplicative
+- [ ] Tools are minimal and necessary
+- [ ] Instructions are clear and unambiguous
+- [ ] Agent has been tested with representative tasks
+- [ ] Documentation references are current
+- [ ] Security considerations addressed (if applicable)
+
+## Common Agent Patterns
+
+### Testing Specialist
+**Purpose**: Focus on test coverage and quality
+**Tools**: All tools (for comprehensive test creation)
+**Approach**: Analyze, identify gaps, write tests, avoid production code changes
+
+### Implementation Planner
+**Purpose**: Create detailed technical plans and specifications
+**Tools**: Limited to `['read', 'search', 'edit']`
+**Approach**: Analyze requirements, create documentation, avoid implementation
+
+### Code Reviewer
+**Purpose**: Review code quality and provide feedback
+**Tools**: `['read', 'search']` only
+**Approach**: Analyze, suggest improvements, no direct modifications
+
+### Refactoring Specialist
+**Purpose**: Improve code structure and maintainability
+**Tools**: `['read', 'search', 'edit']`
+**Approach**: Analyze patterns, propose refactorings, implement safely
+
+### Security Auditor
+**Purpose**: Identify security issues and vulnerabilities
+**Tools**: `['read', 'search', 'web']`
+**Approach**: Scan code, check against OWASP, report findings
+
+## Common Mistakes to Avoid
+
+### Frontmatter Errors
+- ❌ Missing `description` field
+- ❌ Description not wrapped in quotes
+- ❌ Invalid tool names without checking documentation
+- ❌ Incorrect YAML syntax (indentation, quotes)
+
+### Tool Configuration Issues
+- ❌ Granting excessive tool access unnecessarily
+- ❌ Missing required tools for agent's purpose
+- ❌ Not using tool aliases consistently
+- ❌ Forgetting MCP server namespace (`server-name/tool`)
+
+### Prompt Content Problems
+- ❌ Vague, ambiguous instructions
+- ❌ Conflicting or contradictory guidelines
+- ❌ Lack of clear scope definition
+- ❌ Missing output expectations
+- ❌ Overly verbose instructions (exceeding character limits)
+- ❌ No examples or context for complex tasks
+
+### Organizational Issues
+- ❌ Filename doesn't reflect agent purpose
+- ❌ Wrong directory (confusing repo vs org level)
+- ❌ Using spaces or special characters in filename
+- ❌ Duplicate agent names causing conflicts
+
+## Testing and Validation
+
+### Manual Testing
+1. Create the agent file with proper frontmatter
+2. Reload VS Code or refresh GitHub.com
+3. Select the agent from the dropdown in Copilot Chat
+4. Test with representative user queries
+5. Verify tool access works as expected
+6. Confirm output meets expectations
+
+### Integration Testing
+- Test agent with different file types in scope
+- Verify MCP server connectivity (if configured)
+- Check agent behavior with missing context
+- Test error handling and edge cases
+- Validate agent switching and handoffs
+
+### Quality Checks
+- Run through agent creation checklist
+- Review against common mistakes list
+- Compare with example agents in repository
+- Get peer review for complex agents
+- Document any special configuration needs
+
+## Additional Resources
+
+### Official Documentation
+- [Creating Custom Agents](https://docs.github.com/en/copilot/how-tos/use-copilot-agents/coding-agent/create-custom-agents)
+- [Custom Agents Configuration](https://docs.github.com/en/copilot/reference/custom-agents-configuration)
+- [Custom Agents in VS Code](https://code.visualstudio.com/docs/copilot/customization/custom-agents)
+- [MCP Integration](https://docs.github.com/en/copilot/how-tos/use-copilot-agents/coding-agent/extend-coding-agent-with-mcp)
+
+### Community Resources
+- [Awesome Copilot Agents Collection](https://github.com/github/awesome-copilot/tree/main/agents)
+- [Customization Library Examples](https://docs.github.com/en/copilot/tutorials/customization-library/custom-agents)
+- [Your First Custom Agent Tutorial](https://docs.github.com/en/copilot/tutorials/customization-library/custom-agents/your-first-custom-agent)
+
+### Related Files
+- [Prompt Files Guidelines](./prompt.instructions.md) - For creating prompt files
+- [Instructions Guidelines](./instructions.instructions.md) - For creating instruction files
+
+## Version Compatibility Notes
+
+### GitHub.com (Coding Agent)
+- ✅ Fully supports all standard frontmatter properties
+- ✅ Repository and org/enterprise level agents
+- ✅ MCP server configuration (org/enterprise)
+- ❌ Does not support `model`, `argument-hint`, `handoffs` properties
+
+### VS Code / JetBrains / Eclipse / Xcode
+- ✅ Supports `model` property for AI model selection
+- ✅ Supports `argument-hint` and `handoffs` properties
+- ✅ User profile and workspace-level agents
+- ❌ Cannot configure MCP servers at repository level
+- ⚠️ Some properties may behave differently
+
+When creating agents for multiple environments, focus on common properties and test in all target environments. Use `target` property to create environment-specific agents when necessary.
diff --git a/.github/instructions/azure-devops-pipelines.instructions.md b/.github/instructions/azure-devops-pipelines.instructions.md
new file mode 100644
index 0000000000..c98d8bb1d4
--- /dev/null
+++ b/.github/instructions/azure-devops-pipelines.instructions.md
@@ -0,0 +1,187 @@
+---
+description: 'Best practices for Azure DevOps Pipeline YAML files'
+applyTo: '**/azure-pipelines.yml, **/azure-pipelines*.yml, **/*.pipeline.yml'
+---
+
+# Azure DevOps Pipeline YAML Best Practices
+
+Guidelines for creating maintainable, secure, and efficient Azure DevOps pipelines in PowerToys.
+
+## General Guidelines
+
+- Use YAML syntax consistently with proper indentation (2 spaces)
+- Always include meaningful names and display names for pipelines, stages, jobs, and steps
+- Implement proper error handling and conditional execution
+- Use variables and parameters to make pipelines reusable and maintainable
+- Follow the principle of least privilege for service connections and permissions
+- Include comprehensive logging and diagnostics for troubleshooting
+
+## Pipeline Structure
+
+- Organize complex pipelines using stages for better visualization and control
+- Use jobs to group related steps and enable parallel execution when possible
+- Implement proper dependencies between stages and jobs
+- Use templates for reusable pipeline components
+- Keep pipeline files focused and modular - split large pipelines into multiple files
+
+## Build Best Practices
+
+- Use specific agent pool versions and VM images for consistency
+- Cache dependencies (npm, NuGet, Maven, etc.) to improve build performance
+- Implement proper artifact management with meaningful names and retention policies
+- Use build variables for version numbers and build metadata
+- Include code quality gates (lint checks, testing, security scans)
+- Ensure builds are reproducible and environment-independent
+
+## Testing Integration
+
+- Run unit tests as part of the build process
+- Publish test results in standard formats (JUnit, VSTest, etc.)
+- Include code coverage reporting and quality gates
+- Implement integration and end-to-end tests in appropriate stages
+- Use test impact analysis when available to optimize test execution
+- Fail fast on test failures to provide quick feedback
+
+## Security Considerations
+
+- Use Azure Key Vault for sensitive configuration and secrets
+- Implement proper secret management with variable groups
+- Use service connections with minimal required permissions
+- Enable security scans (dependency vulnerabilities, static analysis)
+- Implement approval gates for production deployments
+- Use managed identities when possible instead of service principals
+
+## Deployment Strategies
+
+- Implement proper environment promotion (dev → staging → production)
+- Use deployment jobs with proper environment targeting
+- Implement blue-green or canary deployment strategies when appropriate
+- Include rollback mechanisms and health checks
+- Use infrastructure as code (ARM, Bicep, Terraform) for consistent deployments
+- Implement proper configuration management per environment
+
+## Variable and Parameter Management
+
+- Use variable groups for shared configuration across pipelines
+- Implement runtime parameters for flexible pipeline execution
+- Use conditional variables based on branches or environments
+- Secure sensitive variables and mark them as secrets
+- Document variable purposes and expected values
+- Use variable templates for complex variable logic
+
+## Performance Optimization
+
+- Use parallel jobs and matrix strategies when appropriate
+- Implement proper caching strategies for dependencies and build outputs
+- Use shallow clone for Git operations when full history isn't needed
+- Optimize Docker image builds with multi-stage builds and layer caching
+- Monitor pipeline performance and optimize bottlenecks
+- Use pipeline resource triggers efficiently
+
+## Monitoring and Observability
+
+- Include comprehensive logging throughout the pipeline
+- Use Azure Monitor and Application Insights for deployment tracking
+- Implement proper notification strategies for failures and successes
+- Include deployment health checks and automated rollback triggers
+- Use pipeline analytics to identify improvement opportunities
+- Document pipeline behavior and troubleshooting steps
+
+## Template and Reusability
+
+- Create pipeline templates for common patterns
+- Use extends templates for complete pipeline inheritance
+- Implement step templates for reusable task sequences
+- Use variable templates for complex variable logic
+- Version templates appropriately for stability
+- Document template parameters and usage examples
+
+## Branch and Trigger Strategy
+
+- Implement appropriate triggers for different branch types
+- Use path filters to trigger builds only when relevant files change
+- Configure proper CI/CD triggers for main/master branches
+- Use pull request triggers for code validation
+- Implement scheduled triggers for maintenance tasks
+- Consider resource triggers for multi-repository scenarios
+
+## Example Structure
+
+```yaml
+# azure-pipelines.yml
+trigger:
+  branches:
+    include:
+      - main
+      - develop
+  paths:
+    exclude:
+      - docs/*
+      - README.md
+
+variables:
+  - group: shared-variables
+  - name: buildConfiguration
+    value: 'Release'
+
+stages:
+  - stage: Build
+    displayName: 'Build and Test'
+    jobs:
+      - job: Build
+        displayName: 'Build Application'
+        pool:
+          vmImage: 'ubuntu-latest'
+        steps:
+          - task: UseDotNet@2
+            displayName: 'Use .NET SDK'
+            inputs:
+              version: '8.x'
+          
+          - task: DotNetCoreCLI@2
+            displayName: 'Restore dependencies'
+            inputs:
+              command: 'restore'
+              projects: '**/*.csproj'
+          
+          - task: DotNetCoreCLI@2
+            displayName: 'Build application'
+            inputs:
+              command: 'build'
+              projects: '**/*.csproj'
+              arguments: '--configuration $(buildConfiguration) --no-restore'
+
+  - stage: Deploy
+    displayName: 'Deploy to Staging'
+    dependsOn: Build
+    condition: and(succeeded(), eq(variables['Build.SourceBranch'], 'refs/heads/main'))
+    jobs:
+      - deployment: DeployToStaging
+        displayName: 'Deploy to Staging Environment'
+        environment: 'staging'
+        strategy:
+          runOnce:
+            deploy:
+              steps:
+                - download: current
+                  displayName: 'Download drop artifact'
+                  artifact: drop
+                - task: AzureWebApp@1
+                  displayName: 'Deploy to Azure Web App'
+                  inputs:
+                    azureSubscription: 'staging-service-connection'
+                    appType: 'webApp'
+                    appName: 'myapp-staging'
+                    package: '$(Pipeline.Workspace)/drop/**/*.zip'
+```
+
+## Common Anti-Patterns to Avoid
+
+- Hardcoding sensitive values directly in YAML files
+- Using overly broad triggers that cause unnecessary builds
+- Mixing build and deployment logic in a single stage
+- Not implementing proper error handling and cleanup
+- Using deprecated task versions without upgrade plans
+- Creating monolithic pipelines that are difficult to maintain
+- Not using proper naming conventions for clarity
+- Ignoring pipeline security best practices
diff --git a/.github/instructions/common-libraries.instructions.md b/.github/instructions/common-libraries.instructions.md
new file mode 100644
index 0000000000..b016032fb9
--- /dev/null
+++ b/.github/instructions/common-libraries.instructions.md
@@ -0,0 +1,61 @@
+---
+description: 'Guidelines for shared libraries including logging, IPC, settings, DPI, telemetry, and utilities consumed by multiple modules'
+applyTo: 'src/common/**'
+---
+
+# Common Libraries – Shared Code Guidance
+
+Guidelines for modifying shared code in `src/common/`. Changes here can have wide-reaching impact across the entire PowerToys codebase.
+
+## Scope
+
+- Logging infrastructure (`src/common/logger/`)
+- IPC primitives and named pipe utilities
+- Settings serialization and management
+- DPI awareness and scaling utilities
+- Telemetry helpers
+- General utilities (JSON parsing, string helpers, etc.)
+
+## Guidelines
+
+### API Stability
+
+- Avoid breaking public headers/APIs; if changed, search & update all callers
+- Coordinate ABI-impacting struct/class layout changes; keep binary compatibility
+- When modifying public interfaces, grep the entire codebase for usages
+
+### Performance
+
+- Watch perf in hot paths (hooks, timers, serialization)
+- Avoid avoidable allocations in frequently called code
+- Profile changes that touch performance-sensitive areas
+
+### Dependencies
+
+- Ask before adding third-party deps or changing serialization formats
+- New dependencies must be MIT-licensed or approved by PM team
+- Add any new external packages to `NOTICE.md`
+
+### Logging
+
+- C++ logging uses spdlog (`Logger::info`, `Logger::warn`, `Logger::error`, `Logger::debug`)
+- Initialize with `init_logger()` early in startup
+- Keep hot paths quiet – no logging in tight loops or hooks
+
+## Acceptance Criteria
+
+- No unintended ABI breaks
+- No noisy logs in hot paths
+- New non-obvious symbols briefly commented
+- All callers updated when interfaces change
+
+## Code Style
+
+- **C++**: Follow `.clang-format` in `src/`; use Modern C++ patterns per C++ Core Guidelines
+- **C#**: Follow `src/.editorconfig`; enforce StyleCop.Analyzers
+
+## Validation
+
+- Build: `tools\build\build.cmd` from `src/common/` folder
+- Verify no ABI breaks: grep for changed function/struct names across codebase
+- Check logs: ensure no new logging in performance-critical paths
diff --git a/.github/instructions/instructions.instructions.md b/.github/instructions/instructions.instructions.md
new file mode 100644
index 0000000000..9de95659ab
--- /dev/null
+++ b/.github/instructions/instructions.instructions.md
@@ -0,0 +1,256 @@
+---
+description: 'Guidelines for creating high-quality custom instruction files for GitHub Copilot'
+applyTo: '**/*.instructions.md'
+---
+
+# Custom Instructions File Guidelines
+
+Instructions for creating effective and maintainable custom instruction files that guide GitHub Copilot in generating domain-specific code and following project conventions.
+
+## Project Context
+
+- Target audience: Developers and GitHub Copilot working with domain-specific code
+- File format: Markdown with YAML frontmatter
+- File naming convention: lowercase with hyphens (e.g., `react-best-practices.instructions.md`)
+- Location: `.github/instructions/` directory
+- Purpose: Provide context-aware guidance for code generation, review, and documentation
+
+## Required Frontmatter
+
+Every instruction file must include YAML frontmatter with the following fields:
+
+```yaml
+---
+description: 'Brief description of the instruction purpose and scope'
+applyTo: 'glob pattern for target files (e.g., **/*.ts, **/*.py)'
+---
+```
+
+### Frontmatter Guidelines
+
+- **description**: Single-quoted string, 1-500 characters, clearly stating the purpose
+- **applyTo**: Glob pattern(s) specifying which files these instructions apply to
+  - Single pattern: `'**/*.ts'`
+  - Multiple patterns: `'**/*.ts, **/*.tsx, **/*.js'`
+  - Specific files: `'src/**/*.py'`
+  - All files: `'**'`
+
+## File Structure
+
+A well-structured instruction file should include the following sections:
+
+### 1. Title and Overview
+
+- Clear, descriptive title using `#` heading
+- Brief introduction explaining the purpose and scope
+- Optional: Project context section with key technologies and versions
+
+### 2. Core Sections
+
+Organize content into logical sections based on the domain:
+
+- **General Instructions**: High-level guidelines and principles
+- **Best Practices**: Recommended patterns and approaches
+- **Code Standards**: Naming conventions, formatting, style rules
+- **Architecture/Structure**: Project organization and design patterns
+- **Common Patterns**: Frequently used implementations
+- **Security**: Security considerations (if applicable)
+- **Performance**: Optimization guidelines (if applicable)
+- **Testing**: Testing standards and approaches (if applicable)
+
+### 3. Examples and Code Snippets
+
+Provide concrete examples with clear labels:
+
+```markdown
+### Good Example
+\`\`\`language
+// Recommended approach
+code example here
+\`\`\`
+
+### Bad Example
+\`\`\`language
+// Avoid this pattern
+code example here
+\`\`\`
+```
+
+### 4. Validation and Verification (Optional but Recommended)
+
+- Build commands to verify code
+- Lint checks and formatting tools
+- Testing requirements
+- Verification steps
+
+## Content Guidelines
+
+### Writing Style
+
+- Use clear, concise language
+- Write in imperative mood ("Use", "Implement", "Avoid")
+- Be specific and actionable
+- Avoid ambiguous terms like "should", "might", "possibly"
+- Use bullet points and lists for readability
+- Keep sections focused and scannable
+
+### Best Practices
+
+- **Be Specific**: Provide concrete examples rather than abstract concepts
+- **Show Why**: Explain the reasoning behind recommendations when it adds value
+- **Use Tables**: For comparing options, listing rules, or showing patterns
+- **Include Examples**: Real code snippets are more effective than descriptions
+- **Stay Current**: Reference current versions and best practices
+- **Link Resources**: Include official documentation and authoritative sources
+
+### Common Patterns to Include
+
+1. **Naming Conventions**: How to name variables, functions, classes, files
+2. **Code Organization**: File structure, module organization, import order
+3. **Error Handling**: Preferred error handling patterns
+4. **Dependencies**: How to manage and document dependencies
+5. **Comments and Documentation**: When and how to document code
+6. **Version Information**: Target language/framework versions
+
+## Patterns to Follow
+
+### Bullet Points and Lists
+
+```markdown
+## Security Best Practices
+
+- Always validate user input before processing
+- Use parameterized queries to prevent SQL injection
+- Store secrets in environment variables, never in code
+- Implement proper authentication and authorization
+- Enable HTTPS for all production endpoints
+```
+
+### Tables for Structured Information
+
+```markdown
+## Common Issues
+
+| Issue            | Solution            | Example                       |
+| ---------------- | ------------------- | ----------------------------- |
+| Magic numbers    | Use named constants | `const MAX_RETRIES = 3`       |
+| Deep nesting     | Extract functions   | Refactor nested if statements |
+| Hardcoded values | Use configuration   | Store API URLs in config      |
+```
+
+### Code Comparison
+
+```markdown
+### Good Example - Using TypeScript interfaces
+\`\`\`typescript
+interface User {
+  id: string;
+  name: string;
+  email: string;
+}
+
+function getUser(id: string): User {
+  // Implementation
+}
+\`\`\`
+
+### Bad Example - Using any type
+\`\`\`typescript
+function getUser(id: any): any {
+  // Loses type safety
+}
+\`\`\`
+```
+
+### Conditional Guidance
+
+```markdown
+## Framework Selection
+
+- **For small projects**: Use Minimal API approach
+- **For large projects**: Use controller-based architecture with clear separation
+- **For microservices**: Consider domain-driven design patterns
+```
+
+## Patterns to Avoid
+
+- **Overly verbose explanations**: Keep it concise and scannable
+- **Outdated information**: Always reference current versions and practices
+- **Ambiguous guidelines**: Be specific about what to do or avoid
+- **Missing examples**: Abstract rules without concrete code examples
+- **Contradictory advice**: Ensure consistency throughout the file
+- **Copy-paste from documentation**: Add value by distilling and providing context
+
+## Testing Your Instructions
+
+Before finalizing instruction files:
+
+1. **Test with Copilot**: Try the instructions with actual prompts in VS Code
+2. **Verify Examples**: Ensure code examples are correct and run without errors
+3. **Check Glob Patterns**: Confirm `applyTo` patterns match intended files
+
+## Example Structure
+
+Here's a minimal example structure for a new instruction file:
+
+```markdown
+---
+description: 'Brief description of purpose'
+applyTo: '**/*.ext'
+---
+
+# Technology Name Development
+
+Brief introduction and context.
+
+## General Instructions
+
+- High-level guideline 1
+- High-level guideline 2
+
+## Best Practices
+
+- Specific practice 1
+- Specific practice 2
+
+## Code Standards
+
+### Naming Conventions
+- Rule 1
+- Rule 2
+
+### File Organization
+- Structure 1
+- Structure 2
+
+## Common Patterns
+
+### Pattern 1
+Description and example
+
+\`\`\`language
+code example
+\`\`\`
+
+### Pattern 2
+Description and example
+
+## Validation
+
+- Build command: `command to verify`
+- Lint checks: `command to lint`
+- Testing: `command to test`
+```
+
+## Maintenance
+
+- Review instructions when dependencies or frameworks are updated
+- Update examples to reflect current best practices
+- Remove outdated patterns or deprecated features
+- Add new patterns as they emerge in the community
+- Keep glob patterns accurate as project structure evolves
+
+## Additional Resources
+
+- [Custom Instructions Documentation](https://code.visualstudio.com/docs/copilot/customization/custom-instructions)
+- [Awesome Copilot Instructions](https://github.com/github/awesome-copilot/tree/main/instructions)
diff --git a/.github/instructions/prompt.instructions.md b/.github/instructions/prompt.instructions.md
new file mode 100644
index 0000000000..a232edb97d
--- /dev/null
+++ b/.github/instructions/prompt.instructions.md
@@ -0,0 +1,88 @@
+---
+description: 'Guidelines for creating high-quality prompt files for GitHub Copilot'
+applyTo: '**/*.prompt.md'
+---
+
+# Copilot Prompt Files Guidelines
+
+Instructions for creating effective and maintainable prompt files that guide GitHub Copilot in delivering consistent, high-quality outcomes across any repository.
+
+## Scope and Principles
+- Target audience: maintainers and contributors authoring reusable prompts for Copilot Chat.
+- Goals: predictable behaviour, clear expectations, minimal permissions, and portability across repositories.
+- Primary references: VS Code documentation on prompt files and organization-specific conventions.
+
+## Frontmatter Requirements
+
+Every prompt file should include YAML frontmatter with the following fields:
+
+### Required/Recommended Fields
+
+| Field | Required | Description |
+|-------|----------|-------------|
+| `description` | Recommended | A short description of the prompt (single sentence, actionable outcome) |
+| `name` | Optional | The name shown after typing `/` in chat. Defaults to filename if not specified |
+| `agent` | Recommended | The agent to use: `ask`, `edit`, `agent`, or a custom agent name. Defaults to current agent |
+| `model` | Optional | The language model to use. Defaults to currently selected model |
+| `tools` | Optional | List of tool/tool set names available for this prompt |
+| `argument-hint` | Optional | Hint text shown in chat input to guide user interaction |
+
+### Guidelines
+
+- Use consistent quoting (single quotes recommended) and keep one field per line for readability and version control clarity
+- If `tools` are specified and current agent is `ask` or `edit`, the default agent becomes `agent`
+- Preserve any additional metadata (`language`, `tags`, `visibility`, etc.) required by your organization
+
+## File Naming and Placement
+- Use kebab-case filenames ending with `.prompt.md` and store them under `.github/prompts/` unless your workspace standard specifies another directory.
+- Provide a short filename that communicates the action (for example, `generate-readme.prompt.md` rather than `prompt1.prompt.md`).
+
+## Body Structure
+- Start with an `#` level heading that matches the prompt intent so it surfaces well in Quick Pick search.
+- Organize content with predictable sections. Recommended baseline: `Mission` or `Primary Directive`, `Scope & Preconditions`, `Inputs`, `Workflow` (step-by-step), `Output Expectations`, and `Quality Assurance`.
+- Adjust section names to fit the domain, but retain the logical flow: why → context → inputs → actions → outputs → validation.
+- Reference related prompts or instruction files using relative links to aid discoverability.
+
+## Input and Context Handling
+- Use `${input:variableName[:placeholder]}` for required values and explain when the user must supply them. Provide defaults or alternatives where possible.
+- Call out contextual variables such as `${selection}`, `${file}`, `${workspaceFolder}` only when they are essential, and describe how Copilot should interpret them.
+- Document how to proceed when mandatory context is missing (for example, “Request the file path and stop if it remains undefined”).
+
+## Tool and Permission Guidance
+- Limit `tools` to the smallest set that enables the task. List them in the preferred execution order when the sequence matters.
+- If the prompt inherits tools from a chat mode, mention that relationship and state any critical tool behaviours or side effects.
+- Warn about destructive operations (file creation, edits, terminal commands) and include guard rails or confirmation steps in the workflow.
+
+## Instruction Tone and Style
+- Write in direct, imperative sentences targeted at Copilot (for example, “Analyze”, “Generate”, “Summarize”).
+- Keep sentences short and unambiguous, following Google Developer Documentation translation best practices to support localization.
+- Avoid idioms, humor, or culturally specific references; favor neutral, inclusive language.
+
+## Output Definition
+- Specify the format, structure, and location of expected results (for example, “Create an architecture decision record file using the template below, such as `docs/architecture-decisions/record-XXXX.md`).
+- Include success criteria and failure triggers so Copilot knows when to halt or retry.
+- Provide validation steps—manual checks, automated commands, or acceptance criteria lists—that reviewers can execute after running the prompt.
+
+## Examples and Reusable Assets
+- Embed Good/Bad examples or scaffolds (Markdown templates, JSON stubs) that the prompt should produce or follow.
+- Maintain reference tables (capabilities, status codes, role descriptions) inline to keep the prompt self-contained. Update these tables when upstream resources change.
+- Link to authoritative documentation instead of duplicating lengthy guidance.
+
+## Quality Assurance Checklist
+- [ ] Frontmatter fields are complete, accurate, and least-privilege.
+- [ ] Inputs include placeholders, default behaviours, and fallbacks.
+- [ ] Workflow covers preparation, execution, and post-processing without gaps.
+- [ ] Output expectations include formatting and storage details.
+- [ ] Validation steps are actionable (commands, diff checks, review prompts).
+- [ ] Security, compliance, and privacy policies referenced by the prompt are current.
+- [ ] Prompt executes successfully in VS Code (`Chat: Run Prompt`) using representative scenarios.
+
+## Maintenance Guidance
+- Version-control prompts alongside the code they affect; update them when dependencies, tooling, or review processes change.
+- Review prompts periodically to ensure tool lists, model requirements, and linked documents remain valid.
+- Coordinate with other repositories: when a prompt proves broadly useful, extract common guidance into instruction files or shared prompt packs.
+
+## Additional Resources
+- [Prompt Files Documentation](https://code.visualstudio.com/docs/copilot/customization/prompt-files#_prompt-file-format)
+- [Awesome Copilot Prompt Files](https://github.com/github/awesome-copilot/tree/main/prompts)
+- [Tool Configuration](https://code.visualstudio.com/docs/copilot/chat/chat-agent-mode#_agent-mode-tools)
diff --git a/.github/instructions/runner-settings-ui.instructions.md b/.github/instructions/runner-settings-ui.instructions.md
new file mode 100644
index 0000000000..ebc2510a37
--- /dev/null
+++ b/.github/instructions/runner-settings-ui.instructions.md
@@ -0,0 +1,68 @@
+---
+description: 'Guidelines for Runner and Settings UI components that communicate via named pipes and manage module lifecycle'
+applyTo: 'src/runner/**,src/settings-ui/**'
+---
+
+# Runner & Settings UI – Core Components Guidance
+
+Guidelines for modifying the Runner (tray/module loader) and Settings UI (configuration app). These components communicate via Windows Named Pipes using JSON messages.
+
+## Runner (`src/runner/`)
+
+### Scope
+
+- Module bootstrap, hotkey management, settings bridge, update/elevation handling
+
+### Guidelines
+
+- If IPC/JSON contracts change, mirror updates in `src/settings-ui/**`
+- Keep module discovery in `src/runner/main.cpp` in sync when adding/removing modules
+- Keep startup lean: avoid blocking/network calls in early init path
+- Preserve GPO & elevation behaviors; confirm no regression in policy handling
+- Ask before modifying update workflow or elevation logic
+
+### Acceptance Criteria
+
+- Stable startup, consistent contracts, no unnecessary logging noise
+
+## Settings UI (`src/settings-ui/`)
+
+### Scope
+
+- WinUI/WPF UI, communicates with Runner over named pipes; manages persisted settings schema
+
+### Guidelines
+
+- Don't break settings schema silently; add migration when shape changes
+- If IPC/JSON contracts change, align with `src/runner/**` implementation
+- Keep UI responsive: marshal to UI thread for UI-bound operations
+- Reuse existing styles/resources; avoid duplicate theme keys
+- Add/adjust migration or serialization tests when changing persisted settings
+
+### Acceptance Criteria
+
+- Schema integrity preserved, responsive UI, consistent contracts, no style duplication
+
+## Shared Concerns
+
+### IPC Contract Changes
+
+When modifying the JSON message format between Runner and Settings UI:
+
+1. Update both `src/runner/` and `src/settings-ui/` in the same PR
+2. Preserve backward compatibility where possible
+3. Add migration logic for settings schema changes
+4. Test both directions of communication
+
+### Code Style
+
+- **C++ (Runner)**: Follow `.clang-format` in `src/`
+- **C# (Settings UI)**: Follow `src/.editorconfig`, use StyleCop.Analyzers
+- **XAML**: Use XamlStyler or run `.\.pipelines\applyXamlStyling.ps1 -Main`
+
+## Validation
+
+- Build Runner: `tools\build\build.cmd` from `src/runner/`
+- Build Settings UI: `tools\build\build.cmd` from `src/settings-ui/`
+- Test IPC: Launch both Runner and Settings UI, verify communication works
+- Schema changes: Run serialization tests if settings shape changed
diff --git a/.github/prompts/create-commit-title.prompt.md b/.github/prompts/create-commit-title.prompt.md
index e589b660c5..6c665fe7ba 100644
--- a/.github/prompts/create-commit-title.prompt.md
+++ b/.github/prompts/create-commit-title.prompt.md
@@ -1,7 +1,10 @@
-agent: 'agent'
-model: GPT-5.1-Codex-Max
-description: 'Generate an 80-character git commit title for the local diff.'
 ---
+agent: 'agent'
+model: 'GPT-5.1-Codex-Max'
+description: 'Generate an 80-character git commit title for the local diff'
+---
+
+# Generate Commit Title
 
 **Goal:** Provide a ready-to-paste git commit title (<= 80 characters) that captures the most important local changes since `HEAD`.
 
diff --git a/.github/prompts/create-pr-summary.prompt.md b/.github/prompts/create-pr-summary.prompt.md
index 1df32e1d47..cbd1c0443d 100644
--- a/.github/prompts/create-pr-summary.prompt.md
+++ b/.github/prompts/create-pr-summary.prompt.md
@@ -1,7 +1,10 @@
-agent: 'agent'
-model: GPT-5.1-Codex-Max
-description: 'Generate a PowerToys-ready pull request description from the local diff.'
 ---
+agent: 'agent'
+model: 'GPT-5.1-Codex-Max'
+description: 'Generate a PowerToys-ready pull request description from the local diff'
+---
+
+# Generate PR Summary
 
 **Goal:** Produce a ready-to-paste PR title and description that follows PowerToys conventions by comparing the current branch against a user-selected target branch.
 
diff --git a/.github/prompts/fix-issue.prompt.md b/.github/prompts/fix-issue.prompt.md
index 38098bdd51..d7aeda0381 100644
--- a/.github/prompts/fix-issue.prompt.md
+++ b/.github/prompts/fix-issue.prompt.md
@@ -1,9 +1,12 @@
+---
 agent: 'agent'
-model: GPT-5.1-Codex-Max
-description: "Execute the fix for a GitHub issue using the previously generated implementation plan. Apply code & tests directly in the repo. Output only a PR description (and optional manual steps)."
+model: 'GPT-5.1-Codex-Max'
+description: 'Execute the fix for a GitHub issue using the previously generated implementation plan'
 ---
 
-# DEPENDENCY
+# Fix GitHub Issue
+
+## Dependencies
 Source review prompt (for generating the implementation plan if missing):
 - .github/prompts/review-issue.prompt.md
 
diff --git a/.github/prompts/fix-spelling.prompt.md b/.github/prompts/fix-spelling.prompt.md
index a5762358b8..91d11a73b5 100644
--- a/.github/prompts/fix-spelling.prompt.md
+++ b/.github/prompts/fix-spelling.prompt.md
@@ -1,7 +1,10 @@
-agent: 'agent'
-model: GPT-5.1-Codex-Max
-description: 'Resolve Code scanning / check-spelling comments on the active PR.'
 ---
+agent: 'agent'
+model: 'GPT-5.1-Codex-Max'
+description: 'Resolve Code scanning / check-spelling comments on the active PR'
+---
+
+# Fix Spelling Comments
 
 **Goal:** Clear every outstanding GitHub pull request comment created by the `Code scanning / check-spelling` workflow by explicitly allowing intentional terms.
 
diff --git a/.github/prompts/review-issue.prompt.md b/.github/prompts/review-issue.prompt.md
index 86b8955f70..f0de64f699 100644
--- a/.github/prompts/review-issue.prompt.md
+++ b/.github/prompts/review-issue.prompt.md
@@ -1,9 +1,12 @@
+---
 agent: 'agent'
-model: GPT-5.1-Codex-Max
-description: "You are a GitHub issue review and planning expert; score (0-100) and write one implementation plan. Outputs: overview.md, implementation-plan.md."
+model: 'GPT-5.1-Codex-Max'
+description: 'Review a GitHub issue, score it (0-100), and generate an implementation plan'
 ---
 
-# GOAL
+# Review GitHub Issue
+
+## Goal
 For **#{{issue_number}}** produce:
 1) `Generated Files/issueReview/{{issue_number}}/overview.md`
 2) `Generated Files/issueReview/{{issue_number}}/implementation-plan.md`
diff --git a/.github/prompts/review-pr.prompt.md b/.github/prompts/review-pr.prompt.md
index a3687b30e8..3f8f07d6b0 100644
--- a/.github/prompts/review-pr.prompt.md
+++ b/.github/prompts/review-pr.prompt.md
@@ -1,9 +1,10 @@
+---
 agent: 'agent'
-model: GPT-5.1-Codex-Max
-description: "gh-driven PR review; per-step Markdown + machine-readable outputs"
+model: 'GPT-5.1-Codex-Max'
+description: 'Perform a comprehensive PR review with per-step Markdown and machine-readable outputs'
 ---
 
-# PR Review — gh + stepwise
+# Review Pull Request
 
 **Goal**: Given `{{pr_number}}`, run a *one-topic-per-step* review. Write files to `Generated Files/prReview/{{pr_number}}/` (replace `{{pr_number}}` with the integer). Emit machine‑readable blocks for a GitHub MCP to post review comments.
 
diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000000..b3663bdbd8
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,165 @@
+---
+description: 'Top-level AI contributor guidance for developing PowerToys - a collection of Windows productivity utilities'
+applyTo: '**'
+---
+
+# PowerToys – AI Contributor Guide
+
+This is the top-level guidance for AI contributions to PowerToys. Keep changes atomic, follow existing patterns, and cite exact paths in PRs.
+
+## Overview
+
+PowerToys is a set of utilities for power users to tune and streamline their Windows experience.
+
+| Area | Location | Description |
+|------|----------|-------------|
+| Runner | `src/runner/` | Main executable, tray icon, module loader, hotkey management |
+| Settings UI | `src/settings-ui/` | WinUI/WPF configuration app communicating via named pipes |
+| Modules | `src/modules/` | Individual PowerToys utilities (each in its own subfolder) |
+| Common Libraries | `src/common/` | Shared code: logging, IPC, settings, DPI, telemetry, utilities |
+| Build Tools | `tools/build/` | Build scripts and automation |
+| Documentation | `doc/devdocs/` | Developer documentation |
+| Installer | `installer/` | WiX-based installer projects |
+
+For architecture details and module types, see [Architecture Overview](doc/devdocs/core/architecture.md).
+
+## Conventions
+
+For detailed coding conventions, see:
+- [Coding Guidelines](doc/devdocs/development/guidelines.md) – Dependencies, testing, PR management
+- [Coding Style](doc/devdocs/development/style.md) – Formatting, C++/C#/XAML style rules
+- [Logging](doc/devdocs/development/logging.md) – C++ spdlog and C# Logger usage
+
+### Component-Specific Instructions
+
+These instruction files are automatically applied when working in their respective areas:
+- [Runner & Settings UI](.github/instructions/runner-settings-ui.instructions.md) – IPC contracts, schema migrations
+- [Common Libraries](.github/instructions/common-libraries.instructions.md) – ABI stability, shared code guidelines
+
+## Build
+
+### Prerequisites
+
+- Visual Studio 2022 17.4+
+- Windows 10 1803+ (April 2018 Update or newer)
+- Initialize submodules once: `git submodule update --init --recursive`
+
+### Build Commands
+
+| Task | Command |
+|------|---------|
+| First build / NuGet restore | `tools\build\build-essentials.cmd` |
+| Build current folder | `tools\build\build.cmd` |
+| Build with options | `build.ps1 -Platform x64 -Configuration Release` |
+
+### Build Discipline
+
+1. One terminal per operation (build → test). Do not switch or open new ones mid-flow
+2. After making changes, `cd` to the project folder that changed (`.csproj`/`.vcxproj`)
+3. Use scripts to build: `tools/build/build.ps1` or `tools/build/build.cmd`
+4. For first build or missing NuGet packages, run `build-essentials.cmd` first
+5. **Exit code 0 = success; non-zero = failure** – treat this as absolute
+6. On failure, read the errors log: `build.<config>.<platform>.errors.log`
+7. Do not start tests or launch Runner until the build succeeds
+
+### Build Logs
+
+Located next to the solution/project being built:
+- `build.<configuration>.<platform>.errors.log` – errors only (check this first)
+- `build.<configuration>.<platform>.all.log` – full log
+- `build.<configuration>.<platform>.trace.binlog` – for MSBuild Structured Log Viewer
+
+For complete details, see [Build Guidelines](tools/build/BUILD-GUIDELINES.md).
+
+## Tests
+
+### Test Discovery
+
+- Find test projects by product code prefix (e.g., `FancyZones`, `AdvancedPaste`)
+- Look for sibling folders or 1-2 levels up named `<Product>*UnitTests` or `<Product>*UITests`
+
+### Running Tests
+
+1. **Build the test project first**, wait for exit code 0
+2. Run via VS Test Explorer (`Ctrl+E, T`) or `vstest.console.exe` with filters
+3. **Avoid `dotnet test`** in this repo – use VS Test Explorer or vstest.console.exe
+
+### Test Types
+
+| Type | Requirements | Setup |
+|------|--------------|-------|
+| Unit Tests | Standard dev environment | None |
+| UI Tests | WinAppDriver v1.2.1, Developer Mode | Install from [WinAppDriver releases](https://github.com/microsoft/WinAppDriver/releases/tag/v1.2.1) |
+| Fuzz Tests | OneFuzz, .NET 8 | See [Fuzzing Tests](doc/devdocs/tools/fuzzingtesting.md) |
+
+### Test Discipline
+
+1. Add or adjust tests when changing behavior
+2. If tests skipped, state why (e.g., comment-only change, string rename)
+3. New modules handling file I/O or user input **must** implement fuzzing tests
+
+### Special Requirements
+
+- **Mouse Without Borders**: Requires 2+ physical computers (not VMs)
+- **Multi-monitor utilities**: Test with 2+ monitors, different DPI settings
+
+For UI test setup details, see [UI Tests](doc/devdocs/development/ui-tests.md).
+
+## Boundaries
+
+### Ask for Clarification When
+
+- Ambiguous spec after scanning relevant docs
+- Cross-module impact (shared enum/struct) is unclear
+- Security, elevation, or installer changes involved
+- GPO or policy handling modifications needed
+
+### Areas Requiring Extra Care
+
+| Area | Concern | Reference |
+|------|---------|-----------|
+| `src/common/` | ABI breaks | [Common Libraries Instructions](.github/instructions/common-libraries.instructions.md) |
+| `src/runner/`, `src/settings-ui/` | IPC contracts, schema | [Runner & Settings UI Instructions](.github/instructions/runner-settings-ui.instructions.md) |
+| Installer files | Release impact | Careful review required |
+| Elevation/GPO logic | Security | Confirm no regression in policy handling |
+
+### What NOT to Do
+
+- Don't merge incomplete features into main (use feature branches)
+- Don't break IPC/JSON contracts without updating both runner and settings-ui
+- Don't add noisy logs in hot paths
+- Don't introduce third-party deps without PM approval and `NOTICE.md` update
+
+## Validation Checklist
+
+Before finishing, verify:
+
+- [ ] Build clean with exit code 0
+- [ ] Tests updated and passing locally
+- [ ] No unintended ABI breaks or schema changes
+- [ ] IPC contracts consistent between runner and settings-ui
+- [ ] New dependencies added to `NOTICE.md`
+- [ ] PR is atomic (one logical change), with issue linked
+
+## Documentation Index
+
+### Core Architecture
+- [Architecture Overview](doc/devdocs/core/architecture.md)
+- [Runner](doc/devdocs/core/runner.md)
+- [Settings System](doc/devdocs/core/settings/readme.md)
+- [Module Interface](doc/devdocs/modules/interface.md)
+
+### Development
+- [Coding Guidelines](doc/devdocs/development/guidelines.md)
+- [Coding Style](doc/devdocs/development/style.md)
+- [Logging](doc/devdocs/development/logging.md)
+- [UI Tests](doc/devdocs/development/ui-tests.md)
+- [Fuzzing Tests](doc/devdocs/tools/fuzzingtesting.md)
+
+### Build & Tools
+- [Build Guidelines](tools/build/BUILD-GUIDELINES.md)
+- [Tools Overview](doc/devdocs/tools/readme.md)
+
+### Instructions (Auto-Applied)
+- [Runner & Settings UI](.github/instructions/runner-settings-ui.instructions.md)
+- [Common Libraries](.github/instructions/common-libraries.instructions.md)
diff --git a/src/common/common.instructions.md b/src/common/common.instructions.md
deleted file mode 100644
index f9bde1d388..0000000000
--- a/src/common/common.instructions.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-applyTo: "**/*.cs,**/*.cpp,**/*.c,**/*.h,**/*.hpp"
----
-# Common – shared libraries guidance (concise)
-
-Scope
-- Logging, IPC, settings, DPI, telemetry, utilities consumed by multiple modules.
-
-Guidelines
-- Avoid breaking public headers/APIs; if changed, search & update all callers.
-- Coordinate ABI-impacting struct/class layout changes; keep binary compatibility.
-- Watch perf in hot paths (hooks, timers, serialization); avoid avoidable allocations.
-- Ask before adding third‑party deps or changing serialization formats.
-
-Acceptance
-- No unintended ABI breaks, no noisy logs, new non-obvious symbols briefly commented.
\ No newline at end of file
diff --git a/src/runner/runner.instructions.md b/src/runner/runner.instructions.md
deleted file mode 100644
index 9dace8aae3..0000000000
--- a/src/runner/runner.instructions.md
+++ /dev/null
@@ -1,17 +0,0 @@
----
-applyTo: "**/*.cpp,**/*.c,**/*.h,**/*.hpp,**/*.rc"
----
-# Runner – tray / host process guidance
-
-Scope
-- Module bootstrap, hotkey management, settings bridge, update/elevation handling.
-
-Guidelines
-- If IPC/JSON contracts change, mirror updates in `src/settings-ui/**`.
-- Keep module discovery in `src/runner/main.cpp` in sync when adding/removing modules.
-- Keep startup lean: avoid blocking/network calls in early init path.
-- Preserve GPO & elevation behaviors; confirm no regression in policy handling.
-- Ask before modifying update workflow or elevation logic.
-
-Acceptance
-- Stable startup, consistent contracts, no unnecessary logging noise.
\ No newline at end of file
diff --git a/src/settings-ui/settings-ui.instructions.md b/src/settings-ui/settings-ui.instructions.md
deleted file mode 100644
index cf527b69f0..0000000000
--- a/src/settings-ui/settings-ui.instructions.md
+++ /dev/null
@@ -1,17 +0,0 @@
----
-applyTo: "**/*.cs,**/*.xaml"
----
-# Settings UI – configuration app guidance
-
-Scope
-- WinUI/WPF UI, communicates with Runner over named pipes; manages persisted settings schema.
-
-Guidelines
-- Don’t break settings schema silently; add migration when shape changes.
-- If IPC/JSON contracts change, align with `src/runner/**` implementation.
-- Keep UI responsive: marshal to UI thread for UI-bound operations.
-- Reuse existing styles/resources; avoid duplicate theme keys.
-- Add/adjust migration or serialization tests when changing persisted settings.
-
-Acceptance
-- Schema integrity preserved, responsive UI, consistent contracts, no style duplication.
\ No newline at end of file