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Context7's SDK 2.0 Migration Leaked SSE Streams — Two Patches Landed the Same Day With p99.9 Latency Data
Context7 shipped @upstash/context7-mcp 4.0.1 and 4.0.2 on 2026-08-11, both cleaning up fallout from the 4.0.0 migration to MCP SDK 2.0. Version 4.0.1 stopped forcing `responseMode: "sse"` on the HTTP handler because every response was riding an unreleased SSE stream, and 4.0.2 added a 60s `AbortSignal.timeout()` after finding stalled backend calls were inheriting undici's ~300s default. The team justified the 60s figure with production data — these are vector queries with p99.9 around 3.2s — and a companion [redacted] release fixed silent anonymous fallback when stored OAuth tokens expired.
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