Add Tasks support to MCPServer #2201

Tasks support (SEP-1686) landed in #1645 for the lowlevel Server API only. MCPServer has no way to return a CreateTaskResult from a @tool()-decorated function, nor does it expose enable_tasks().

This was explicitly deferred during review of #1645 (comment).

Related

• SEP-1686: Tasks #1645 — SEP-1686 implementation (lowlevel only)
• MCPServer.add_tool() missing execution parameter for task support declaration (spec compliance gap) #2156 — closed; requested execution param on add_tool(), but that alone is insufficient without the ability to return CreateTaskResult
• feat: add execution parameter to add_tool() for task support declaration #2157 — open PR for the execution param (same limitation)
• fix: expose enable_tasks() on MCPServer #2033 — closed PR that exposed enable_tasks() on MCPServer (also insufficient on its own)

Note

The Tasks spec is expected to change significantly in the next spec revision — see the Multi Round-Trip Requests SEP draft, which reworks the Tasks workflow for server-initiated requests (new tasks/input_response method, InputRequests/InputResponses types, new ephemeral/persistent tool split).

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