Add TypeScript SDK Implementation to AgentConnect

typescript/.kiro/specs/anp-typescript-sdk/requirements.md

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+# Requirements Document
+
+## Introduction
+
+This document defines the requirements for developing a TypeScript SDK for the Agent Network Protocol (ANP). The SDK will enable developers to build ANP-compliant agents with support for identity authentication (did:wba), agent description (ADP), agent discovery (ADSP), and meta-protocol negotiation. The SDK will use XState v5 for state machine management to handle complex protocol flows and state transitions.
+
+**IMPORTANT**: All SDK code MUST be developed in a new `ts_sdk` directory at the root of the project. This directory will contain the complete TypeScript SDK implementation including source code, tests, configuration files, and documentation.
+
+## Glossary
+
+- **ANP_SDK**: The TypeScript Software Development Kit for implementing Agent Network Protocol functionality, located in the `ts_sdk` directory
+- **ts_sdk_Directory**: The root directory containing all SDK source code, tests, and configuration files
+- **Agent**: An autonomous software entity that can communicate and collaborate with other agents using ANP
+- **DID_WBA**: Web-Based Agent Decentralized Identifier method for cross-platform identity authentication
+- **ADP**: Agent Description Protocol for publishing agent capabilities and interfaces
+- **ADSP**: Agent Discovery Service Protocol for discovering agents in the network
+- **Meta_Protocol**: Protocol negotiation mechanism for agents to dynamically agree on communication protocols
+- **State_Machine**: XState v5 state machine for managing protocol flows and transitions
+- **HTTP_Client**: HTTP client for making requests to other agents and services
+- **Crypto_Module**: Cryptographic module for signing, verification, and encryption operations
+
+## Requirements
+
+### Requirement 1: DID:WBA Identity Management
+
+**User Story:** As an agent developer, I want to create and manage DID:WBA identities, so that my agent can authenticate with other agents across platforms.
+
+#### Acceptance Criteria
+
+1. WHEN the developer creates a new DID:WBA identity, THE ANP_SDK SHALL generate a key pair and create a DID document conforming to the did:wba specification
+2. WHEN the developer provides a domain and path, THE ANP_SDK SHALL construct a valid did:wba identifier following the format "did:wba:domain:path"
+3. WHEN the developer requests to sign data, THE ANP_SDK SHALL use the private key to generate a signature and return the signature value
+4. WHEN the developer provides a DID identifier, THE ANP_SDK SHALL resolve the DID document from the appropriate HTTPS endpoint
+5. WHEN the developer provides signature data and a DID document, THE ANP_SDK SHALL verify the signature using the public key from the verification method
+
+### Requirement 2: HTTP Authentication with DID:WBA
+
+**User Story:** As an agent developer, I want to authenticate HTTP requests using DID:WBA, so that my agent can securely communicate with other agents.
+
+#### Acceptance Criteria
+
+1. WHEN the agent makes an initial HTTP request to another agent, THE ANP_SDK SHALL include the Authorization header with DID, nonce, timestamp, verification_method, and signature
+2. WHEN the agent receives an HTTP request with DID:WBA authentication, THE ANP_SDK SHALL resolve the client DID document and verify the signature
+3. WHEN signature verification succeeds, THE ANP_SDK SHALL generate an access token and return it to the client
+4. WHEN the agent makes subsequent requests, THE ANP_SDK SHALL include the access token in the Authorization header
+5. WHEN the agent receives a request with an access token, THE ANP_SDK SHALL validate the token and grant access if valid
+
+### Requirement 3: Agent Description Management
+
+**User Story:** As an agent developer, I want to create and publish agent description documents, so that other agents can discover my agent's capabilities and interfaces.
+
+#### Acceptance Criteria
+
+1. WHEN the developer provides agent metadata, THE ANP_SDK SHALL generate an ADP-compliant JSON-LD document with required fields
+2. WHEN the developer adds information resources, THE ANP_SDK SHALL include them in the Infomations array with type, description, and url
+3. WHEN the developer adds interfaces, THE ANP_SDK SHALL include them in the interfaces array with type, protocol, version, and url
+4. WHEN the developer requests to sign the agent description, THE ANP_SDK SHALL generate a proof object with digital signature
+5. WHEN the developer provides an agent description URL, THE ANP_SDK SHALL fetch and parse the agent description document
+
+### Requirement 4: Agent Discovery
+
+**User Story:** As an agent developer, I want to discover other agents in the network, so that my agent can find and interact with relevant services.
+
+#### Acceptance Criteria
+
+1. WHEN the developer provides a domain name, THE ANP_SDK SHALL fetch the agent discovery document from the .well-known/agent-descriptions endpoint
+2. WHEN the discovery document contains pagination, THE ANP_SDK SHALL recursively fetch all pages until no next property exists
+3. WHEN the developer registers with a search service, THE ANP_SDK SHALL send a registration request with the agent description URL
+4. WHEN the developer searches for agents, THE ANP_SDK SHALL query the search service and return matching agent descriptions
+5. WHEN the discovery process encounters errors, THE ANP_SDK SHALL handle errors gracefully and return appropriate error messages
+
+### Requirement 5: Meta-Protocol Negotiation State Machine
+
+**User Story:** As an agent developer, I want to negotiate communication protocols dynamically, so that my agent can communicate efficiently with heterogeneous agents.
+
+#### Acceptance Criteria
+
+1. WHEN the agent initiates protocol negotiation, THE State_Machine SHALL transition to the negotiating state and send a protocolNegotiation message
+2. WHEN the agent receives a negotiation response, THE State_Machine SHALL process the candidateProtocols and determine whether to accept or continue negotiating
+3. WHEN both agents agree on a protocol, THE State_Machine SHALL transition to the codeGeneration state
+4. WHEN code generation completes, THE State_Machine SHALL send a codeGeneration message with status "generated"
+5. WHEN the negotiation exceeds the maximum rounds, THE State_Machine SHALL transition to the rejected state and terminate negotiation
+
+### Requirement 6: Application Protocol Communication
+
+**User Story:** As an agent developer, I want to send and receive application protocol messages, so that my agent can exchange data with other agents using negotiated protocols.
+
+#### Acceptance Criteria
+
+1. WHEN the agent sends an application message, THE ANP_SDK SHALL construct a message with protocol type 01 and the application data
+2. WHEN the agent receives an application message, THE ANP_SDK SHALL parse the protocol data according to the negotiated protocol
+3. WHEN the agent sends a natural language message, THE ANP_SDK SHALL construct a message with protocol type 10 and UTF-8 encoded text
+4. WHEN the agent receives a natural language message, THE ANP_SDK SHALL decode the UTF-8 text and pass it to the application
+5. WHEN message processing fails, THE ANP_SDK SHALL generate appropriate error messages and handle the failure gracefully
+
+### Requirement 7: End-to-End Encryption
+
+**User Story:** As an agent developer, I want to encrypt messages end-to-end, so that my agent's communications remain private even through intermediaries.
+
+#### Acceptance Criteria
+
+1. WHEN the agent initiates encrypted communication, THE Crypto_Module SHALL perform ECDHE key exchange using the recipient's keyAgreement public key
+2. WHEN the shared secret is established, THE Crypto_Module SHALL derive encryption keys using a key derivation function
+3. WHEN the agent sends a message, THE Crypto_Module SHALL encrypt the message data using the derived encryption key
+4. WHEN the agent receives an encrypted message, THE Crypto_Module SHALL decrypt the message using the shared secret
+5. WHEN encryption or decryption fails, THE Crypto_Module SHALL return an error and prevent message processing
+
+### Requirement 8: Test Cases Negotiation
+
+**User Story:** As an agent developer, I want to negotiate test cases with other agents, so that protocol implementations can be verified before production use.
+
+#### Acceptance Criteria
+
+1. WHEN the agent proposes test cases, THE State_Machine SHALL send a testCasesNegotiation message with test case descriptions
+2. WHEN the agent receives test case proposals, THE State_Machine SHALL evaluate the test cases and respond with acceptance or modifications
+3. WHEN both agents agree on test cases, THE State_Machine SHALL execute the test cases and verify the results
+4. WHEN test execution fails, THE State_Machine SHALL send a fixErrorNegotiation message with error descriptions
+5. WHEN all tests pass, THE State_Machine SHALL transition to the ready state for production communication
+
+### Requirement 9: Error Handling and Recovery
+
+**User Story:** As an agent developer, I want robust error handling, so that my agent can recover from failures and continue operating.
+
+#### Acceptance Criteria
+
+1. WHEN network errors occur, THE ANP_SDK SHALL retry the request with exponential backoff up to a maximum number of attempts
+2. WHEN DID resolution fails, THE ANP_SDK SHALL return a descriptive error message indicating the resolution failure
+3. WHEN signature verification fails, THE ANP_SDK SHALL reject the request and return an authentication error
+4. WHEN protocol negotiation fails, THE State_Machine SHALL transition to the rejected state and notify the application
+5. WHEN unexpected errors occur, THE ANP_SDK SHALL log the error details and provide a generic error response
+
+### Requirement 10: Configuration and Extensibility
+
+**User Story:** As an agent developer, I want to configure the SDK behavior, so that I can customize it for my specific use case.
+
+#### Acceptance Criteria
+
+1. WHEN the developer initializes the SDK, THE ANP_SDK SHALL accept configuration options for timeouts, retry policies, and endpoints
+2. WHEN the developer registers custom protocol handlers, THE ANP_SDK SHALL use the custom handlers for processing specific protocol types
+3. WHEN the developer provides custom cryptographic implementations, THE ANP_SDK SHALL use the custom implementations instead of defaults
+4. WHEN the developer enables debug mode, THE ANP_SDK SHALL log detailed information about protocol flows and state transitions
+5. WHEN the developer extends the SDK with plugins, THE ANP_SDK SHALL load and execute the plugins at appropriate lifecycle hooks
+
+### Requirement 11: Test-Driven Development Support
+
+**User Story:** As an agent developer, I want comprehensive test coverage, so that I can trust the SDK implementation and ensure protocol compliance.
+
+#### Acceptance Criteria
+
+1. WHEN implementing any SDK feature, THE ANP_SDK SHALL have unit tests written before the implementation code
+2. WHEN testing DID operations, THE ANP_SDK SHALL include tests for key generation, signing, verification, and DID resolution
+3. WHEN testing protocol negotiation, THE ANP_SDK SHALL include tests for all state transitions and edge cases
+4. WHEN testing HTTP authentication, THE ANP_SDK SHALL include tests for both successful and failed authentication scenarios
+5. WHEN running the test suite, THE ANP_SDK SHALL achieve at least 80% code coverage across all modules