fixing jsonSchema validation by using zod

CHANGELOG.md

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+# Changelog
+
+All notable changes to the GDS Mock MCP Server will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.0] - 2026-04-08
+
+### Added
+- Initial release of GDS Mock MCP Server
+- **Flight Search and Booking** (User Story 1 - MVP)
+  - `searchFlights` tool: Search for flights between airports with realistic pricing
+  - `bookFlight` tool: Create flight bookings with passenger details
+  - Mock data: 100+ airports, 30+ airlines, deterministic flight generation
+  - Support for economy, business, and first class cabins
+  - Realistic pricing ($200-$2500+ based on route and class)
+  
+- **Session Management** (User Story 4)
+  - Concurrent session support with UUID v4 session IDs
+  - Session isolation: bookings scoped to sessions with zero data leakage
+  - Session TTL management (1 hour default, configurable)
+  - Activity tracking and automatic cleanup
+  
+- **Remote Access** (User Story 6)
+  - **MCP 2025-11-25 Streamable HTTP transport** (HTTP/1.1 + SSE)
+  - Protocol version validation middleware (strict 2025-11-25)
+  - IP-based rate limiting (100 req/min default, Valkey-backed)
+  - CORS middleware with permissive wildcard policy
+  - Health check endpoint (`/health`)
+  - CLI arguments: `--remote`, `--port`, `--host`, `--verbose`, `--log-level`
+  - Dual transport support: stdio (default) or HTTP
+  - SSE polling pattern with Last-Event-ID resumption
+  - Example remote client demonstrating SSE connection
+  - Nginx reverse proxy configuration template
+  
+- **Hotel Search and Bundling** (User Story 2)
+  - `searchHotels` tool: Search hotels by city with pricing tiers
+  - `bookHotel` tool: Create hotel bookings and bundle with flights
+  - Mock data: 50+ properties across major cities (3-5 star ratings)
+  - Realistic pricing: budget ($80-$150), midrange ($150-$300), luxury ($300-$800)
+  - Multi-service bundling: combine hotels with flights under single PNR
+  
+- **Car Rental Integration** (User Story 3)
+  - `searchCars` tool: Search car rentals by pickup/dropoff location
+  - `bookCar` tool: Create car rental bookings and bundle with flights/hotels
+  - Mock data: 8 rental companies, 8 vehicle categories
+  - Complete travel package support: flights + hotels + cars under one PNR
+  
+- **Booking Management Tools**
+  - `retrieveBooking` tool: Fetch booking details by PNR
+  - `cancelBooking` tool: Cancel bookings with status validation
+  - `listBookings` tool: List all bookings in current session
+  - `getSessionInfo` tool: View session metadata
+  - `clearSession` tool: Clear session data
+  
+- **Infrastructure**
+  - Valkey 8.0+ integration for session and PNR storage
+  - Structured logging with Pino
+  - MCP error codes and error handling
+  - JSON schema validation
+  - PNR generation with TEST- prefix (base32 encoding)
+  - Docker Compose configuration for Valkey
+  - Multi-stage Dockerfile with non-root user
+  - ESLint and Prettier configuration
+  
+### Technical Details
+- **Node.js 20 LTS** with ES modules
+- **@modelcontextprotocol/sdk v1.0.4+** for MCP protocol
+- **ioredis v5.4.1** for Valkey/Redis client
+- **Pino v9.5.0** for structured logging
+- **Express v4.18+** for HTTP middleware
+- **express-rate-limit v7.1+** for IP-based rate limiting
+- **CORS v2.8+** for cross-origin support
+
+### Security
+- PNRs prefixed with TEST- to prevent confusion with production
+- No real external API calls (100% self-contained)
+- Rate limiting on remote access (100 req/min per IP)
+- Localhost binding by default (127.0.0.1) per MCP security
+- Non-root Docker user
+- Session isolation with cryptographically secure UUIDs
+
+### Documentation
+- Comprehensive README with installation and usage instructions
+- SAFETY_DISCLAIMER.md emphasizing testing/demo purpose only
+- Inline JSDoc comments for all public functions
+- Example remote client with SSE demonstration
+- Nginx configuration template for optional HTTP/2 upgrade
+
+## [Unreleased]
+
+### Planned
+- Additional search filters (airline preference, hotel amenities, car features)
+- Enhanced error messages with suggested corrections
+- Metrics and monitoring endpoints
+- Load testing and performance optimization
+- Additional mock data for global coverage
+
+---
+
+**Note**: This is a mock server for testing and demonstration purposes only. All data is simulated. No real travel bookings are created.