feat(ai-proxy): distinguish MCP connection errors from configuration errors in logs #1440
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…Error When MCP servers are unreachable (connection refused, DNS not found, timeout, network unreachable), log as 'Warn' instead of 'Error' to reduce noise. All other errors (authentication, configuration, protocol errors) remain as 'Error'. Unreachable error codes: ECONNREFUSED, ENOTFOUND, ETIMEDOUT, ENETUNREACH, EHOSTUNREACH Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
Warninstead ofErrorErrorThis reduces log noise when MCP servers are temporarily unavailable, which is a common scenario when customers configure MCP servers but don't remove them when they go down.
Connection error patterns detected:
ECONNREFUSED,ENOTFOUND,ETIMEDOUT,ECONNRESET,ENETUNREACH,EHOSTUNREACH,EPIPE,ECONNABORTEDfetch failed,socket hang up,network errorMCP error -32000(ConnectionClosed),MCP error -32001(RequestTimeout)spawn ENOENT,spawn EACCESTest plan
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