Connection Error Handling Improvements

This cluster focuses on enhancing the handling of connection errors and failover mechanisms within the AI agent framework.

16 PRs

fix

#	Title	Author	Created	GitHub
4036	fix: include cause detail in agent connection error diagnostic	anajuliabit	2026-01-29	View
5031	fix: add network connection error codes to failover classifier	shayan919293	2026-01-30	View
12314	fix: treat HTTP 5xx server errors as failover-worthy	hsssgdtc	2026-02-09	View
12687	fix: handle empty LLM stream response with failover	janckerchen	2026-02-09	View
12725	Update gateway-smoke.ts	yasir-shahhhhh	2026-02-09	View
13820	feat(agents): retry empty-stream once before fallback	Louise-Qiuqiu	2026-02-11	View
15163	fix(errors): classify connection errors as retryable failover reason	fagemx	2026-02-13	View
15815	Fallback LLM doesn't trigger if primary model is local	shihanqu	2026-02-13	View
16529	fix(fallback): treat OpenRouter routing errors as failover-eligible	zirubak	2026-02-14	View
19077	fix(agents): trigger model failover on connection-refused and network-unreach...	ayanesakura	2026-02-17	View
21017	fix: treat HTTP 502/503/504 as failover-eligible (timeout reason)	taw0002	2026-02-19	View
21033	fix(failover): classify connection errors as timeout for model failover	zerone0x	2026-02-19	View
21049	fix(failover): treat HTTP 5xx as rate-limit for model fallback	maximalmargin	2026-02-19	View
21491	fix: classify Google 503 UNAVAILABLE as transient failover [AI-assisted]	ZPTDclaw	2026-02-20	View
21516	fix: classify connection errors as timeout for model failover (#20931)	echoVic	2026-02-20	View
22589	fix: trigger failover on gateway websocket connection errors	pandego	2026-02-21	View