Feat/0.5.6 (#15)

* Enhance project structure and update configurations

- Added new project structure documentation in `project-structure.txt` for better clarity on the organization of the codebase.
- Updated Jest configuration in `jest.config.js` to support module path aliases for improved import management.
- Modified `tsconfig.json` to include the `src` directory for TypeScript compilation.
- Updated `package.json` with new dependencies for TypeScript and TSX support.
- Refactored service and transport layers to improve modularity and organization, including the introduction of new files in the `src/services` and `src/transport` directories.
- Removed deprecated files and methods to streamline the codebase and enhance maintainability.
- Updated tests to align with the new structure and validate functionality across the application.

* Update package.json and tsconfig.json for TypeScript enhancements; refactor service methods for clarity

- Added `ts-patch` dependency and a `prepare` script in `package.json` for TypeScript patching.
- Updated `tsconfig.json` to include `typescript-transform-paths` for improved path handling.
- Refactored service methods in `resubscribe-task.ts`, `send-message.ts`, and `stream-message.ts` to use `contextId` for better clarity.
- Modified `index.ts` to remove deprecated exports and enhance module organization.
- Introduced new tests for npm package installation and deployment functionalities to ensure robustness.

* Add A2A EngineBuilder and related types for step management

- Introduced `EngineBuilder` class to facilitate the creation and management of steps in the A2A protocol.
- Added types for `textStep`, `fileStep`, and `dataStep` to define various step functionalities.
- Implemented `createAgentExecutor` function to execute steps in order and handle task status updates.
- Updated `index.ts` and related type definitions to include new builder functionalities.
- Added comprehensive tests for the `AgentBuilder` to ensure correct step creation and execution.

* Update CHANGELOG and README for version 0.5.6; refactor examples and services for new architecture

- Added detailed entries in CHANGELOG for version 0.5.6, highlighting major architectural changes, new features, and breaking changes.
- Updated README to reflect the new service-based architecture, including the introduction of `createAgentServer()` and enhanced agent utilities.
- Refactored example implementations to align with the new architecture, demonstrating the use of `createAgentServer()` and improved agent logic.
- Enhanced service methods and task management to support asynchronous state handling and improved modularity.
- Updated tests to ensure compatibility with the new service-oriented design and validate functionality across the application.

* Remove deprecated dependencies from package.json and enhance README with new event handling section. Updated SDK documentation to include comprehensive event monitoring capabilities and examples for better user guidance.

* Refactor error handling in tests and remove outdated comments

- Removed a TODO comment in `errors.ts` regarding moving functionality to the server.
- Cleaned up comments in `server-impl.test.ts` and `server.test.ts` to enhance clarity and maintain consistency in error message expectations.

* Update package.json to include new dependencies and enhance type safety in service methods

- Added `escape-html` and its TypeScript types to improve HTML escaping in error handling.
- Refactored parameter types in various service methods to use `unknown` for better type safety.
- Updated error handling to utilize `escapeHtml` for sanitizing request IDs.
- Improved code clarity by using `const` instead of `let` where applicable.

* Enhance README and refactor A2A service components for improved clarity and functionality

- Updated README to clarify the artinet SDK's purpose and usage, including version support for `create-quick-agent`.
- Refactored A2A service components to improve modularity and organization, including the introduction of helper functions for message part extraction.
- Enhanced type definitions and added comprehensive documentation for new A2A context and event management features.
- Improved error handling and streamlined agent logic in quick server examples for better user guidance.
- Updated tests to validate new functionalities and ensure compatibility with recent changes.

Author: EditUndo

CHANGELOG.md

@@ -5,14 +5,85 @@ All notable changes to the @artinet/sdk package 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).
 
+## [0.5.6] - 2025-01-25
+
+### Added
+
+- **New Service-Based Architecture**: Complete refactoring with dedicated service layer for better modularity and maintainability
+  - `src/services/a2a/` - A2A protocol service implementation with factory pattern
+  - `src/services/core/` - Core execution and management services
+  - New `A2AServiceInterface` for standardized service contracts
+- **New Express Server Implementation**: Modern Express-based server replacing the legacy A2A server
+  - `createAgentServer()` function for simplified server creation
+  - Custom JSON-RPC middleware for Express (`jsonRPCMiddleware`)
+  - Enhanced error handling with dedicated error middleware
+  - Support for tRPC integration (commented example provided)
+- **Enhanced Type Organization**: Comprehensive type restructuring under `schemas/a2a/` directory using Zod
+  - Authentication types (`auth/auth.ts`, `auth/oauth.ts`, etc.)
+  - Enhanced message, task, and parameter schemas
+  - New deployment-specific type definitions
+- **New Deployment Export Path**: Added `./deployment` export in package.json for deployment utilities
+- **Path Alias Support**: Added `~/` path alias for cleaner imports throughout the codebase
+- **New Core Managers**: Command, event, and stream managers for better resource management
+- **Enhanced Factory Pattern**: Builder pattern implementation for creating A2A services and agents
+
+### Changed
+
+- **BREAKING**: Updated package description from "TypeScript SDK for Agentic Communication" to "TypeScript SDK for the Agent2Agent (A2A) Protocol"
+- **BREAKING**: Major refactoring of server architecture - `A2AServer` is now removed in favor of the new Express-based `createAgentServer()`
+- **BREAKING**: Reorganized exports in main index - services now exported before utils
+- **BREAKING**: Updated Agent Card endpoint from `/.well-known/agent.json` to `/.well-known/agent-card.json`
+- Updated dependencies:
+  - Added `@trpc/server: ^11.4.3` for tRPC integrations
+  - Added `ts-patch: ^3.3.0` for TypeScript transformations
+  - Added `typescript-transform-paths: ^3.5.5` for path transformation
+- Enhanced project structure with better separation of concerns
+- Improved JSON-RPC method handling with dedicated middleware
+- Enhanced error handling with more specific error types and better context
+
+### Deprecated
+
+- **`A2AServer` class**: The legacy A2A server implementation is deprecated. Use the new `createAgentServer()` function instead
+- Legacy server interfaces and parameter types in favor of the new service-based architecture
+
+### Removed
+
+- **Legacy Server Components**: Removed outdated server interfaces and implementations
+  - `src/server/interfaces/params.ts`
+  - `src/server/interfaces/server.ts`
+  - `src/server/interfaces/store.ts`
+  - Legacy Express server utilities
+- **Outdated Manager**: Removed `src/services/manager.ts` in favor of new core managers
+
+### Improved
+
+- **Development Experience**:
+  - Added `prepare` script for automatic ts-patch installation
+  - Added `rebuild` script for clean rebuilds
+  - Enhanced Jest configuration with path mapping support
+- **Code Organization**: Better separation between client, server, services, and utilities
+- **Type Safety**: Enhanced type definitions with more specific interfaces and better error handling
+- **Modularity**: Service-based architecture allows for better testing and extensibility
+- **Documentation**: Added comprehensive project structure documentation
+
+### Technical Notes
+
+- This release represents a major architectural shift towards a service-oriented design
+- The new architecture provides better separation of concerns and improved testability
+- Legacy `A2AServer` has been removed developers should migrate to the new `createAgentServer()` approach
+- Enhanced support for different transport layers (Express, tRPC, WebSockets, etc.)
+- Improved factory patterns for creating and configuring A2A services and agents
+
 ## [0.5.4] - 2025-06-12
 
 ### Added
+
 - New `ExecutionContext` interface for enhanced parameter management across services
 - `MCPExecutionContext` and `NLWebExecutionContext` interfaces for protocol-specific request handling
 - New schema organization under `schemas/a2a` directory for improved code structure
 
 ### Changed
+
 - **BREAKING**: Renamed core methods to align with message-based approach:
   - `sendTask` → `sendMessage`
   - `sendTaskSubscribe` → `sendStreamingMessage`
@@ -22,50 +93,59 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Updated documentation to reflect new method names and functionalities
 
 ### Removed
+
 - Deprecated submodules for `a2a-samples` and `mcp-use`
 
 ## [0.5.2] - 2025-05-25
 
 ### Added
+
 - New `artinet.v0` namespace in `src/utils/deployment/agents.ts` providing `taskManager`, `connect`, and `agent` utilities. These are designed for agents running in sandboxed or managed environments, offering a standardized way to interact with the host system for task execution, inter-agent communication, and external API calls.
 - Corresponding types for the new agent utilities in `src/types/proxy.ts`: `TaskProxy`, `TaskManagerProps`, `TaskManager`, `ConnectProps`, `ConnectAPICallback`, `ClientProxy`, `ClientProps`, `ClientFactory`.
 - New `exports` path `./agents` in `package.json` to expose the `artinet.v0` utilities.
 - New example file `examples/nested-deployment.ts` demonstrating how to use `artinet.v0.agent` for an agent to call another agent, and `artinet.v0.taskManager` for managing the agent's lifecycle.
 - New `dev-pack` script in `package.json` for easier local development and packaging.
 
 ### Changed
+
 - **Refactoring**:
-    - `src/client/interfaces/client.ts` has been moved to `src/types/client.ts`.
-    - `src/server/interfaces/context.ts` has been moved to `src/types/context.ts`.
-    - Internal type imports throughout the codebase have been updated to reflect these changes.
+  - `src/client/interfaces/client.ts` has been moved to `src/types/client.ts`.
+  - `src/server/interfaces/context.ts` has been moved to `src/types/context.ts`.
+  - Internal type imports throughout the codebase have been updated to reflect these changes.
 - Examples `examples/code-deployment.js` and `examples/code-deployment.ts` have been updated to use the new `artinet.v0.taskManager` and `artinet.v0.connect` utilities instead of the deprecated proxy functions.
 - Updated `@types/node` dependency to `^20.17.50`.
 
 ### Deprecated
+
 - The `taskHandlerProxy` and `fetchResponseProxy` functions in `src/utils/deployment/task-wrapper.ts` are now deprecated. Developers should migrate to the new `artinet.v0.taskManager` and `artinet.v0.connect` utilities respectively.
 
 ### Removed
+
 - Removed `json-schema-to-typescript` from `devDependencies` as it's no longer directly used.
 
 ### Fixed
+
 - Minor wording update in the "QUICK-AGENT FAQs" section of `README.md` for clarity on searching by `registrationId/agentId`.
 
 ## [0.5.1] - 2025-05-12
 
 ### Added
+
 - `fullDeployment` utility (`src/utils/deployment/full-deployment.ts`): Enables direct deployment of bundled agent code and its `AgentCard` to the Artinet platform. Requires an `ARTINET_API_KEY`.
 - New comprehensive test suite for deployment features (`tests/deployment.test.ts`), covering `testDeployment` and `fullDeployment`.
 - Agents registered via `A2AServer.registerServer()` or `register: true` now include `tags: ["a2a"]` in their registration payload.
 
 ### Changed
+
 - The `handler` property in `A2AServerParams` (used to pass the agent's core logic) was previously documented and used in some examples as `taskHandler`. This has been corrected to `handler` consistently. While `taskHandler` might have worked due to object flexibility, `handler` is the intended property name.
 - Clarified type description for `ServerDeploymentRequestParams.dependencies` to note it is "currently unsupported".
 - Clarified type description for `BaseServerDeploymentResponseParams.deploymentId` regarding its value in full deployments.
 
 ### Fixed
+
 - Improved error handling in `A2AClient` during `agentCard()` fetching:
-    - Validates parsed URLs before use.
-    - Ensures `AgentCard` objects contain a `name` property.
+  - Validates parsed URLs before use.
+  - Ensures `AgentCard` objects contain a `name` property.
 - Enhanced error logging in `src/transport/rpc/parser.ts` to include `error.message` for `SystemError` instances.
 - Prevented agent registration via `register()` utility if the `AgentCard.url` is localhost, 127.0.0.1, or empty, returning an empty string instead of attempting registration.
 - Corrected an issue in an example in `README.md` where `taskHandler` was used instead of `handler` for the `A2AServer` constructor (matches the breaking change clarification above).
@@ -74,24 +154,28 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [0.5.0] - 2025-05-10
 
 ### Added
+
 - `A2AServer.getExpressApp()`: New method to access the underlying Express application instance, allowing for more flexible server customization and middleware integration.
 - More specific error messages for various RPC errors (e.g., `TASK_NOT_FOUND`, `INVALID_PARAMS`, `PARSE_ERROR`), providing better debugging information and context.
 
 ### Changed
+
 - **BREAKING**: The `data` parameter in the `SystemError` constructor and all specific error factory functions (e.g., `PARSE_ERROR()`, `INVALID_PARAMS()`, `TASK_NOT_FOUND()`) is now mandatory. This change aims to enhance error reporting by ensuring contextual information is always provided with errors.
 - **BREAKING**: Refactored the `createExpressServer` utility (`src/server/lib/express-server.ts`):
-    - It no longer accepts a `port` parameter.
-    - It no longer creates or returns an `http.Server` instance (i.e., it doesn't call `app.listen()`). It now solely configures and returns the Express `app` instance.
-    - The responsibility of starting the HTTP server is now fully handled within the `A2AServer.start()` method, which uses the `app` configured by `createExpressServer`.
+  - It no longer accepts a `port` parameter.
+  - It no longer creates or returns an `http.Server` instance (i.e., it doesn't call `app.listen()`). It now solely configures and returns the Express `app` instance.
+  - The responsibility of starting the HTTP server is now fully handled within the `A2AServer.start()` method, which uses the `app` configured by `createExpressServer`.
 - Updated numerous TypeScript type definitions in `src/types/schema.ts` to more strictly define optional properties. Many properties that were previously `type | null` are now just `type?`, and JSDoc `@default null` comments have been removed. This aligns with standard TypeScript practices where optional properties are either present with a value or absent (undefined), rather than being explicitly `null`.
 - When a task is initiated via `A2AServer.sendTaskAndStore()`, the initial task status (`Task.status`) no longer includes a `message: null` field.
 - In `src/server/lib/state.ts`, when creating a new task object during `loadState`, `sessionId` and `metadata` properties are assigned directly if provided, without defaulting to `null` if they are undefined.
 - Replaced generic `METHOD_NOT_FOUND()` errors with more specific `PUSH_NOTIFICATION_NOT_SUPPORTED()` errors in `defaultSetTaskPushNotificationMethod` and `defaultGetTaskPushNotificationMethod` when the agent's card indicates that push notifications are not supported.
 
 ### Removed
+
 - The test file `tests/deployment.test.ts` has been removed. The `testDeployment` utility and related "Quick-Agents" features remain.
 
 ### Improved
+
 - The documentation section in `README.md` regarding agent code deployment has been renamed from "Agent Code Deployment (Beta)" to "Quick-Agents (Alpha)". This section includes updated descriptions, code examples for bundling and testing agents, and a new FAQ.
 - Server startup logging in `A2AServer` now consistently uses `logInfo` for messages like "A2A Server started and listening".
 
@@ -127,23 +211,23 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - **BREAKING:** Renamed server configuration type from `A2AServerOptions` to `A2AServerParams` for consistency.
 - Updated dependencies to latest versions:
-    - `eventsource-parser` to `^3.0.1`. Adapted streaming logic (`handleEventStream`) to use `EventSourceMessage` type from this library.
-    - `express` to `^5.1.0`.
-    - `jayson` to `^4.2.0`.
-    - `node:16` to `node:22`
-    - `ES2020` to `ES2022`
+  - `eventsource-parser` to `^3.0.1`. Adapted streaming logic (`handleEventStream`) to use `EventSourceMessage` type from this library.
+  - `express` to `^5.1.0`.
+  - `jayson` to `^4.2.0`.
+  - `node:16` to `node:22`
+  - `ES2020` to `ES2022`
 - Updated various code examples in documentation for improved clarity and consistency (`README.md`, `examples/`).
 
 ### Improved
 
 - Refactored server JSON-RPC method handling:
-    - Introduced `createJSONRPCMethod` helper for wrapping A2A method logic with dependency injection and error handling.
-    - Exported default implementations for standard A2A methods (e.g., `defaultSendTaskMethod`) from `lib/middleware/a2a-methods.js`.
-    - Provided `defaultCreateJSONRPCServer` factory demonstrating standard server setup. This simplifies advanced server customization.
+  - Introduced `createJSONRPCMethod` helper for wrapping A2A method logic with dependency injection and error handling.
+  - Exported default implementations for standard A2A methods (e.g., `defaultSendTaskMethod`) from `lib/middleware/a2a-methods.js`.
+  - Provided `defaultCreateJSONRPCServer` factory demonstrating standard server setup. This simplifies advanced server customization.
 - Significantly revised and expanded `README.md` documentation:
-    - Updated Features, Class Documentation, and Usage sections.
-    - Added detailed section on Server Registration & Discovery.
-    - Corrected and clarified Advanced Server Customization examples.
+  - Updated Features, Class Documentation, and Usage sections.
+  - Added detailed section on Server Registration & Discovery.
+  - Corrected and clarified Advanced Server Customization examples.
 - Updated test suite to incorporate tests for new server registration and fallback path functionalities.
 
 ## [0.2.0] - 2025-04-25
@@ -180,7 +264,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Support for streaming responses and push notifications
 - Comprehensive test suite and documentation
 
-<!-- [Unreleased]: https://github.com/artinet/sdk/compare/v0.5.1...HEAD -->
+<!-- [Unreleased]: https://github.com/artinet/sdk/compare/v0.5.6...HEAD -->
+
+[0.5.6]: https://github.com/the-artinet-project/artinet-sdk/compare/v0.5.4...v0.5.6
 [0.5.2]: https://github.com/the-artinet-project/artinet-sdk/compare/v0.5.1...v0.5.2
 [0.5.1]: https://github.com/the-artinet-project/artinet-sdk/compare/v0.5.0...v0.5.1
 [0.5.0]: https://github.com/the-artinet-project/artinet-sdk/compare/v0.4.1...v0.5.0