Regression fix — proxy users must update immediately
Claude Code v2.1.276: Fixed 400 error with proxy/gateway ANTHROPIC_BASE_URL
Original: v2.1.276
Importance: プロキシ経由の環境で全リクエストが失敗する障害であり、対象ユーザーは即座の対応が必要
Summary
Claude Code v2.1.276 fixes a regression from v2.1.275 where all requests failed with a 400 error when ANTHROPIC_BASE_URL pointed to a proxy or gateway. The error was tied to an 'advisor_20260301' input tag validation. This update restores functionality for enterprise deployments using proxy/gateway infrastructure.
Key Points
- v2.1.275 regression: all requests return 400 when using proxy/gateway
- Root cause: 'advisor_20260301' input tag validation logic
- v2.1.276 fixes input schema processing with custom base URLs
- Enterprise proxy/gateway users must update immediately
View developer notes (APIs, breaking changes, migration)
Regression fix: v2.1.275 introduced a bug where requests with custom ANTHROPIC_BASE_URL (proxy/gateway) failed with 400 due to input tag 'advisor_20260301' validation logic. v2.1.276 corrects input schema validation when base URL is proxied. No API endpoint changes; clients must upgrade SDK to restore connectivity through enterprise proxies/gateways.
Source: https://github.com/anthropics/claude-code/releases/tag/v2.1.276
Outlet: Claude Code Releases
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