January 2026 monthly summary for the modelcontextprotocol/go-sdk: Key feature delivered: Configurable Standalone SSE Connection Establishment in StreamableClientTransport. This feature adds explicit options to control how the standalone SSE connection is established, enabling better resource management and compatibility with third-party MCP servers. Key impact: Reduces unnecessary resource usage and improves reliability in mixed environments where server-initiated messages are not required. Brings the SDK behavior in line with MCP spec guidance and peer SDKs, enabling simpler, more predictable deployments in scientific computing and other use cases that rely on request-response patterns. Overall accomplishment: Delivered a targeted, low-risk configuration enhancement that increases flexibility, reliability, and interoperability, while addressing long-standing issues related to SSE streaming behavior. Top achievements: - Implemented DisableListening and DisableStandaloneSSE options in StreamableClientTransport (commit b4f957ff3c279051f9bcc88aa08e897add012a95). - Reduced resource overhead by allowing clients to disable the standalone SSE stream when not needed. - Improved compatibility with third-party MCP servers that do not handle SSE GET requests well. - Brought client behavior in line with MCP SDKs in other languages, improving consistency across implementations. - Addresses issues referenced (Fixes #728; related to server-compatibility and optional listening).