variants: simplify dispatch and session by reducing method boilerplate#8
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Degiorgio
reviewed
Apr 23, 2026
Fix nil handling for params and result Add unit tests for dispatcher
Degiorgio
approved these changes
May 1, 2026
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Simplify variant dispatch and session by replacing per-method boilerplate with generic handlers backed by reflect.
Motivation and Context
The dispatcher and backend session had separate handler functions for every MCP method (ListTools, ListResources, CallTool, Subscribe, etc.), each following an identical pattern: extract params, inject metadata, call inner handler, cast result. This meant ~250 lines of near-identical code across dispatch.go and session.go, and every new MCP method required adding another copy.
How Has This Been Tested?
All existing unit and integration tests pass (go test -v ./...)
Breaking Changes
None. All changes are internal to the variants package. Public API is unchanged.
Types of changes
Refactor (non-breaking change which fixes an issue)