Claude Code Platform Fixes This Week: SSE Keepalive for Vertex/Bedrock, MCP OAuth Fix, Usage Boost Through Aug 19

Claude Code v2.1.229–231: SSE keepalive for Vertex/Bedrock streaming prevents mid-response disconnects, MCP OAuth redirect is fixed, and the usage boost runs through August 19.

Three fixes from the past two days, each addressing a distinct failure mode.

SSE keepalive during long thinking pauses (v2.1.229, Aug 12). When Claude runs extended reasoning on Vertex AI or Amazon Bedrock with streaming on, the upstream gateway can time out if the model thinks for too long without emitting a token. The connection closes silently, and your code gets a truncated response or an error — with no obvious reason why. Claude Code now sends SSE keepalive pings during those pauses, preventing the idle-timeout from triggering. If you've been seeing intermittent mid-response disconnects on Claude Sonnet 5 or Haiku 4.5 through Vertex or Bedrock, this is the fix.

MCP OAuth redirect URI mismatch (v2.1.231, Aug 13). OAuth sign-in was silently failing for MCP servers that use a pre-registered OAuth client — Slack, and any server that registers specific redirect URIs in advance. The URI Claude Code sent didn't match the server's expected value. Fixed. If your Slack MCP or a similar OAuth-backed server was failing to authenticate, upgrade and retry.

Usage boost extended through August 19. The 50% weekly usage boost for Claude Code subscribers (Pro, Max, Team) runs five more days. If you have large multi-agent workflow runs queued, schedule them before August 20 when normal limits resume.

Why it matters: The Vertex/Bedrock SSE fix is the most impactful for production pipelines — enterprises routing Claude through cloud provider APIs were seeing silent failures on extended-reasoning calls. The MCP fix unblocks Slack and any OAuth server with pre-registered redirect URIs.

Sources: Claude Code changelog — code.claude.com · Claude Code August updates — Releasebot