sketch: refactor lowlevel server to handler pattern#1968

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maxisbey wants to merge 17 commits intomainfrom

sketch/lowlevel-server-v2

Commits on Feb 2, 2026

sketch: lowlevel server v2 with overloaded handler classes
maxisbey
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refactor: replace decorator-based handlers with RequestHandler/NotificationHandler pattern
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refactor: split RequestContext into handler context hierarchy
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rename: self.endpoint -> self.handler in handler classes
maxisbey
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refactor: decouple ExperimentalHandlers from Server internals, update migration docs
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refactor: update MCPServer to use RequestHandler pattern instead of decorators
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refactor: collapse context hierarchy into single RequestContext class
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refactor: move _ping_handler below Server class
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refactor: merge request_handler.py and notification_handler.py into handler.py
maxisbey
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refactor: move request_ctx contextvar to lowlevel server, remove per-handler boilerplate
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docs: fix migration guide — request_ctx contextvar still exists
maxisbey
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docs: fix stale examples in migration guide
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refactor: address review — kw_only dataclass, type Experimental properly, remove redundant guard
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fix: allow ping handler override, add task overloads, update stale docstrings
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docs: move lowlevel server sections to Breaking Changes in migration guide
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Update src/mcp/server/lowlevel/__init__.py

maxisbey
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Kludex
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refactor: remove request_ctx from lowlevel public API, fix experimental docs example
maxisbey
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