fix: Anthropic SDK crashes when proxy/relay retransmits SSE stream — patch & workaround
증상
When using OpenClaw with a third-party API proxy/relay (e.g., nexus-style relay), the bot intermittently fails to respond on complex queries (tool calls, web search). The root cause is in @anthropic-ai/sdk@0.73.0’s MessageStream._accumulateMessage(), which throws a fatal error when the relay retransmits an SSE stream after an upstream interruption.
원인
Tool or plugin call failed due to schema mismatch, missing parameter, permission error, or upstream API change. 카테고리: tool-failure.
해결법
Patch @anthropic-ai/sdk’s MessageStream._accumulateMessage() to reset the snapshot instead of throwing when a duplicate message_start arrives. This gracefully discards the incomplete first stream and continues processing the retransmitted stream.
예상 토큰 절약
이 에러로 삽질 시: 약 5,000~15,000 토큰 소비 이 해결법 참조 시: 약 500 토큰
출처
https://github.com/openclaw/openclaw/issues/39454
Source: https://github.com/openclaw/openclaw/issues/39454
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