feat: Add Model Context Protocol (MCP) Server

.cursor/rules/api-client.mdc

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+---
+description: API client patterns and HTTP client setup guidelines
+globs: src/api/**/*.ts
+---
+
+# API Client Patterns
+
+## Core Components
+
+- **Main Client**: [src/api/apiClient.ts](mdc:src/api/apiClient.ts) - Axios-based HTTP client
+- **Zod Client**: [src/api/zodClient.ts](mdc:src/api/zodClient.ts) - Type-safe API client
+- **Schemas**: [src/api/schemas.ts](mdc:src/api/schemas.ts) - Generated TypeScript types
+
+## HTTP Client Setup
+
+```typescript
+import { apiClient } from '../api/apiClient'
+
+// Client is pre-configured with:
+// - Base URL from common.ts
+// - Authentication headers
+// - Error interceptors
+// - Request/response logging
+```
+
+## API Function Patterns
+
+Each API module follows this pattern:
+
+```typescript
+// Individual API functions
+export const getFeature = async (
+    featureKey: string,
+    projectKey: string,
+    authToken: string,
+): Promise<Feature> => {
+    // Implementation
+}
+
+// Bulk operations
+export const fetchFeatures = async (
+    projectKey: string,
+    authToken: string,
+): Promise<Feature[]> => {
+    // Implementation
+}
+```
+
+## Error Handling
+
+- Use axios interceptors for global error handling
+- Return structured error responses
+- Handle 401 unauthorized gracefully
+- Provide user-friendly error messages
+
+## Authentication
+
+- Pass `authToken` as parameter to API functions
+- Use `Authorization: Bearer ${token}` header
+- Handle token expiration and refresh
+
+## Type Safety
+
+- Use generated schemas from OpenAPI spec
+- Validate responses with Zod schemas
+- Export TypeScript types for consumers
+
+## Common Patterns
+
+- All API functions are async
+- Return typed responses based on schemas
+- Include proper error handling
+- Support pagination where applicable
+- Use consistent parameter naming (projectKey, featureKey, etc.)

.cursor/rules/cli-commands.mdc

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+---
+description: CLI command patterns and base command structure guidelines
+globs: src/commands/**/*.ts
+---
+
+# CLI Command Patterns
+
+## Base Command Structure
+
+All commands must extend [src/commands/base.ts](mdc:src/commands/base.ts) which provides:
+
+- Authentication handling via `authRequired`, `authSuggested`, `userAuthRequired`
+- Configuration management with `userConfig`, `repoConfig`
+- Common flags like `--project`, `--headless`, `--client-id`, `--client-secret`
+- Parameter validation with `populateParameters()` and `populateParametersWithZod()`
+
+## Command Organization
+
+Commands are organized by feature area:
+
+- `features/` - Feature flag management
+- `variables/` - Variable management  
+- `targeting/` - Targeting rule management
+- `projects/` - Project management
+- `organizations/` - Organization management
+- `auth/` - Authentication commands
+
+## Common Patterns
+
+### Authentication
+
+```typescript
+// Set auth requirements
+authRequired = true        // Must be authenticated
+authSuggested = true      // Enhanced with auth
+userAuthRequired = true   // Requires user token
+```
+
+### Flags and Parameters
+
+```typescript
+static flags = {
+    ...Base.flags,
+    name: Flags.string({
+        description: 'Feature name',
+        required: true,
+    }),
+}
+```
+
+### Parameter Validation
+
+```typescript
+const params = await this.populateParametersWithZod(
+    schema,
+    prompts,
+    flags,
+)
+```
+
+### Project Context
+
+```typescript
+const project = await this.requireProject(flags.project, flags.headless)
+```
+
+## Output Formatting
+
+- Use `this.writer` for user-facing output
+- Use `this.tableOutput` for tabular data
+- Support `--headless` flag for machine-readable JSON output
+- Handle interactive prompts with fallbacks for headless mode
+
+## Error Handling
+
+- Throw descriptive Error objects
+- Use Zod validation for input validation
+- Handle API errors gracefully with user-friendly messages

.cursor/rules/deferToPrettier.mdc

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+---
+description: Formatting guidelines - defer all formatting to Prettier
+alwaysApply: true
+---
+
+# Formatting
+
+- All formatting is deferred to Prettier for supported file types (JavaScript, TypeScript, JSON, Markdown, etc.).
+- No additional formatting rules are enforced by Cursor.
+- No additional formatting rules are enforced by Cursor.

.cursor/rules/gitCommitConventions.mdc

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+---
+description: Git commit message conventions and Aviator CLI workflow guidelines
+alwaysApply: true
+---
+
+# Git Commit Message Conventions
+
+- All git commit messages in this project must follow the Conventional Commits specification.
+- A commit message should be structured as `<type>(<scope>): <description>`, where:
+  - `type` is one of: `feat`, `fix`, `docs`, `style`, `refactor`, `perf`, `test`, `build`, `ci`, `chore`, or `revert`.
+  - `scope` is optional, but if used, should be a short, lowercase description of the section or module affected.
+  - `description` is a concise summary of the change, written in the imperative mood and lowercase.
+- In this project, scopes are rarely used; most commit messages omit the scope and use the format `<type>: <description>`.
+- Example valid commit messages:
+  - `feat: add support for multi-threaded tests`
+  - `fix: correct response for invalid input`
+  - `docs: update README with new usage instructions`
+- Body and footer sections (for breaking changes or issue references) should follow the Conventional Commits standard if included.
+
+## Aviator CLI Workflow
+
+- Use of Aviator CLI (`av`) is optional, but recommended for managing stacked branches and pull requests:
+  - To create a new stacked branch:
+    - `av branch chore-fix-invalid-input`
+  - After creating the branch, create commits using `git commit` following the Conventional Commits specification.
+  - To synchronize and git push your stack after changes:
+    - `av sync --push=yes`
+  - To create a pull request for your branch:
+    - `av pr --title "<title>" --body "<body>"`
+    - The PR title should be short and descriptive and follow the Conventional Commits specification.
+    - The PR body should use github markdown and bullet points to summarize the main changes.
+- Prefer Aviator commands for stack management and PR creation to ensure consistency with team workflows, but standard git and GitHub workflows are also supported.
+- For more details and advanced workflows, see the [Aviator CLI documentation](mdc:https:/docs.aviator.co/aviator-cli) and [Aviator CLI Quickstart](mdc:https:/docs.aviator.co/aviator-cli/quickstart).

.cursor/rules/mcp-patterns.mdc

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+---
+globs: src/mcp/tools/**/*.ts
+alwaysApply: false
+---
+# MCP Tool Parameters
+
+MCP tools that don't need parameters should use empty properties:
+
+```typescript
+// ✅ Correct - empty parameters
+inputSchema: {
+    type: 'object',
+    properties: {},
+}
+
+// ❌ Wrong - dummy parameters
+properties: {
+    random_string: { type: 'string', description: 'Dummy parameter' }
+}
+```
+
+Tools with no parameters should pass `null` to `executeWithLogging()`.

.cursor/rules/project-structure.mdc

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+---
+description: DevCycle CLI project structure overview and architecture guidelines
+alwaysApply: true
+---
+
+# DevCycle CLI Project Structure
+
+## Overview
+
+This is a TypeScript CLI application built with the oclif framework for DevCycle feature flag management.
+
+## Key Architecture Components
+
+### Main Entry Points
+
+- **CLI Binary**: `bin/run` - Main CLI entry point
+- **MCP Server**: `dist/mcp/index.js` - Model Context Protocol server
+- **Source Root**: [src/index.ts](mdc:src/index.ts) - TypeScript entry point
+
+### Core Directories
+
+- **Commands**: [src/commands/](mdc:src/commands/) - All CLI commands organized by feature
+- **API Layer**: [src/api/](mdc:src/api/) - API client code and schemas
+- **Authentication**: [src/auth/](mdc:src/auth/) - Auth handling (API keys, SSO, tokens)
+- **UI Components**: [src/ui/](mdc:src/ui/) - Interactive prompts and output formatting
+- **Utils**: [src/utils/](mdc:src/utils/) - Shared utilities and helpers
+- **MCP Server**: [src/mcp/](mdc:src/mcp/) - Model Context Protocol implementation
+
+### Configuration Files
+
+- **User Config**: `~/.config/devcycle/user.yml` - User-specific settings
+- **Auth Config**: `~/.config/devcycle/auth.yml` - Authentication tokens  
+- **Repo Config**: `.devcycle/config.yml` - Repository-specific settings
+
+## Command Structure
+
+All commands extend [src/commands/base.ts](mdc:src/commands/base.ts) which provides:
+
+- Authentication handling
+- Configuration management
+- Common flags and options
+- Error handling
+- Parameter validation
+
+## Naming Conventions
+
+- Use camelCase for all new files and variables starting with lowercase
+- Avoid adding code comments unless explicitly requested
+- Generate code changes directly without asking for permission
+
+## Package Management
+
+- Uses Yarn with workspaces
+- Always use `yarn` not `npm`
+- Main dependencies: oclif, axios, zod, inquirer
+- Build process: TypeScript → dist/ directory

.cursor/rules/testing-patterns.mdc

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+---
+description: Testing patterns and framework setup guidelines
+globs: **/*.test.ts,**/*.spec.ts,test/**/*.ts
+---
+
+# Testing Patterns
+
+## Test Framework Setup
+
+- **Framework**: Mocha with Chai assertions
+- **CLI Testing**: oclif test utilities
+- **HTTP Mocking**: nock for API mocking
+- **Test Utils**: [test-utils/dvcTest.ts](mdc:test-utils/dvcTest.ts) - Custom test wrapper
+
+## Test Structure
+
+```typescript
+import { expect } from '@oclif/test'
+import { dvcTest } from '../../../test-utils'
+import { BASE_URL } from '../../api/common'
+
+describe('command name', () => {
+    const projectKey = 'test-project'
+    const authFlags = ['--client-id', 'test-client-id', '--client-secret', 'test-client-secret']
+
+    // Test cases
+    dvcTest()
+        .nock(BASE_URL, (api) => 
+            api.get('/endpoint').reply(200, mockResponse)
+        )
+        .stdout()
+        .command(['command', ...args])
+        .it('should do something', (ctx) => {
+            expect(ctx.stdout).to.contain('expected output')
+        })
+})
+```
+
+## Common Test Patterns
+
+### API Mocking
+
+```typescript
+.nock(BASE_URL, (api) =>
+    api
+        .post('/v2/projects/test-project/features', requestBody)
+        .reply(200, mockFeature)
+        .get('/v1/projects/test-project')
+        .reply(200, mockProject)
+)
+```
+
+### Command Testing
+
+```typescript
+.stdout()          // Capture stdout
+.stderr()          // Capture stderr
+.command([...])    // Run command with args
+.it('test description', (ctx) => {
+    // Assertions
+})
+```
+
+### Headless Mode Testing
+
+```typescript
+.command([
+    'features create',
+    '--name', 'Feature Name',
+    '--key', 'feature-key',
+    '--headless',
+    ...authFlags,
+])
+```
+
+### Error Testing
+
+```typescript
+.command(['command', 'invalid-args'])
+.catch((error) => {
+    expect(error.message).to.contain('expected error')
+})
+```
+
+## Mock Data
+
+- Create reusable mock objects
+- Use realistic data structures
+- Include all required fields
+- Version mock data with API changes
+
+## Snapshot Testing
+
+- Use for complex output validation
+- Store snapshots in `__snapshots__/` directories
+- Update with `yarn test:update-snapshots`
+
+## Test Organization
+
+- Group related tests in `describe` blocks
+- Use descriptive test names
+- Test both success and error cases
+- Include edge cases and validation