Bedrock double-billing fix is subtle but valuable. Invisible non-streaming re-runs behind proxies are hard to spot.
Claude Code v2.1.239 — Cost estimates, plugin sync, and multi-environment fixes
Original: v2.1.239
Importance: 既存ユーザーへの直接的な影響（障害修正・本番環境対応の改善）はあるが、破壊的変更や全体ユーザーへの義務的な対応ではないため、インパクトは中程度
Summary
Claude Code v2.1.239 released with improvements to cost estimation, plugin synchronization, and multi-environment support. Cost estimates now include the 1.1× US-only-inference premium for data-residency workspaces. The fullscreen renderer is now available on Bedrock, Vertex, Foundry and other previously excluded setups. A new `/claude-api upgrade` tool helps migrate Python projects from anthropic 0.x to 1.x. Cloud sessions now properly sync plugins as `name@synced`, and Alpine/musl builds now support native image paste, clipboard, and audio-capture. Numerous fixes address proxy environments, JetBrains IDE terminals, Bedrock streaming, and cloud session resumption.
Key Points
- Cost estimates now include data-residency 1.1× US-only-inference premium
- Fullscreen renderer now available on Bedrock, Vertex, and other previously excluded setups
- New `/claude-api upgrade` command simplifies anthropic 0.x to 1.x migration
- Fixed Bedrock streaming behind proxies causing silent double-billing
- Alpine/musl native support; multiple JetBrains IDE, cloud session, and MCP fixes
View developer notes (APIs, breaking changes, migration)
Claude Code v2.1.239 adds `/claude-api upgrade` command to automate migration from anthropic 0.x to 1.x (timeout handling shifts from `httpx.Timeout` to `anthropic.Timeout`). Cloud sessions now sync plugins as `name@synced` format, preventing overwrites of same-named local plugins. Cost estimation now includes 1.1× US-only-inference premium for data-residency workspaces. Fixed Bedrock streaming behind proxies that strip Content-Type headers, which previously caused silent double-billing by re-running turns non-streaming. Alpine/musl builds now load native image paste, clipboard, and audio-capture add-ons (musl-built binaries instead of glibc). Additional fixes: Bedrock + SSO profile + awsAuthRefresh credential pre-check honors HTTPS_PROXY; JetBrains IDE terminal Edit/Write calls no longer pause 5 seconds; MCP forms in fullscreen now fit window with scroll; remote MCP servers recover after transient 5xx errors.
Source: https://github.com/anthropics/claude-code/releases/tag/v2.1.239
Outlet: Claude Code Releases
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