May 2026 monthly summary for microsoft/mcp focusing on business value, features and stability gains. Delivered Data Factory tooling integration in Fabric MCP Server with multi-user authentication, enabling create/list/execute queries on dataflows and leveraging host TokenCredential delegation to streamline authentication without separate login steps. Implemented a provider-based TokenCredential bridge to DataFactory.MCP.Core, supporting per-execution credentials and removing deadlocks in multi-user scenarios. Consolidated Data Factory tooling by moving towards in-repo adapters and DI registrations, and introduced the ExecuteQuery command to support power-user dataflow queries. Deprecated the DataFactory.MCP submodule in favor of NuGet-based Core delivery, simplifying CI and dependency management. Expanded test coverage with 45 unit tests for the Data Factory tools and dedicated tests for the ProviderDelegatingCredential, improving reliability and maintainability. Strengthened CI and docs: aligned solution files, fixed stdout/stderr separation for smoke tests, and added Data Factory README and changelog entries.