core/client: add MCP client with sessions, server requests, and docs #133
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🦋 Changeset detectedLatest commit: 020cc8b The changes in this PR will be included in the next version bump. This PR includes changesets to release 1 package
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Add complete MCP client implementation: Core Foundation: - McpClient class with fluent API (.use, .onError) - Connection class for server interactions (tools, prompts, resources) - StreamableHttpClientTransport for HTTP communication - ToolAdapter interface for SDK integration - Full TypeScript support with proper type inference - Zero runtime dependencies (built on Fetch API) Session Management: - ClientSessionAdapter interface for session persistence - InMemoryClientSessionAdapter implementation - openSessionStream() for GET SSE streams - Session lifecycle management (create, reconnect, delete) - Event replay with Last-Event-ID support Server-Initiated Requests: - onSample() and onElicit() handler registration - Client _dispatch() method for processing server requests - Middleware support for server-initiated requests - Automatic SSE stream processing for incoming requests - Response sending back to server via POST Testing and Documentation: - 182 integration tests (stateless, session, server requests, E2E) - 624 expect() assertions validating all features - Multi-server workflow tests - Progress notification handling - Error recovery patterns - Complete README documentation with examples The client mirrors McpServer patterns but inverted for sending requests rather than handling them. Supports stateless operations by default with opt-in session and bidirectional features.
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