MCP Extension Tools
Validate MCP 2026-07-28 extension declarations, the Tasks extension and durable task lifecycle objects without executing or contacting a server.
Extensions in MCP 2026-07-28
The extensions framework allows optional MCP capabilities to evolve independently of the core specification. Extensions are explicitly negotiated and use namespaced identifiers to avoid collisions.
Tasks are one official example. Long-running work can be represented by a durable task and inspected through task-specific methods instead of being part of the old experimental core task mechanism.