Fix infinite retry loop in _handle_reconnection#2397
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Christian-Sidak wants to merge 1 commit intomodelcontextprotocol:mainfrom
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Fix infinite retry loop in _handle_reconnection#2397Christian-Sidak wants to merge 1 commit intomodelcontextprotocol:mainfrom
Christian-Sidak wants to merge 1 commit intomodelcontextprotocol:mainfrom
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When a reconnection succeeds at the HTTP level but the SSE stream ends without delivering a complete response, _handle_reconnection recursed with attempt=0, resetting the counter and making MAX_RECONNECTION_ATTEMPTS ineffective. This caused the client to retry forever if the server repeatedly accepted connections but dropped streams. Pass attempt + 1 instead of 0 so total reconnection attempts are properly tracked across recursions. Fixes modelcontextprotocol#2393
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Summary
_handle_reconnectionresetting theattemptcounter to0when an SSE stream ends without a complete response, which madeMAX_RECONNECTION_ATTEMPTSineffective and caused infinite retriesattempt + 1instead of0so total reconnection attempts are tracked across recursionsRoot Cause
When a reconnection succeeds at the HTTP level (200 OK) but the SSE stream drops before delivering a complete
JSONRPCResponse, the method recursed withattempt=0. Only the exception path (connection failure) incremented the counter. A server that accepts connections but drops streams caused the client to retry forever at 1-second intervals.Test plan
MAX_RECONNECTION_ATTEMPTS(2) instead of looping indefinitelyFixes #2393