fix: register logging/setLevel handler via registerCapabilities #1508
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…ed via registerCapabilities When logging capability was added via `registerCapabilities()` instead of the constructor options, the `logging/setLevel` request handler was not being registered, causing setLevel requests to fail silently. Extract the handler registration into a private `registerLoggingHandler()` method with an idempotency guard, and call it from both the constructor and `registerCapabilities()`. Fixes modelcontextprotocol#1464 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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@modelcontextprotocol/client
@modelcontextprotocol/server
@modelcontextprotocol/express
@modelcontextprotocol/hono
@modelcontextprotocol/node
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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
registerCapabilitiesto properly register thelogging/setLevelrequest handler when the logging capability is added after constructionregisterLoggingHandler()method with an idempotency guard, called from both the constructor andregisterCapabilities()setLoggingLevelworks when logging is registered viaregisterCapabilities()Fixes #1464
Test plan
client.setLoggingLevel()works when server usesregisterCapabilities({ logging: {} })instead of constructor optionsregisterCapabilities()🤖 Generated with Claude Code