claude-code bedrock vertex-ai auto-mode deprecation

Claude Code auto mode lands on Bedrock, Vertex, Azure

Classifier-gated execution now available on managed inference platforms—set CLAUDE_CODE_ENABLE_AUTO_MODE=1 to skip manual approval for provably-safe tool calls without --dangerously-skip-permissions.

Summary

Enterprise teams on AWS/GCP/Azure previously chose between slow (approve every call) or risky (skip all checks). Auto mode eliminates that tradeoff for CI/CD and automated refactoring workflows. Hard deadline: CLAUDE_CODE_OPUS_4_6_FAST_MODE_OVERRIDE removed June 1—audit your configs now.

Why it matters

Implementation verdict

Replaces manual approval bottleneck and the deprecated CLAUDE_CODE_OPUS_4_6_FAST_MODE_OVERRIDE flag. Requires v2.1.158+, Opus 4.7/4.8, one env var, and 30-second config per provider. Ready now—upgrade to v2.1.156+ immediately if using Opus 4.8 (v2.1.156 fixes deterministic API 400 errors from thinking block mutation).

Sources

1.Set CLAUDE_CODE_ENABLE_AUTO_MODE=1 and upgrade before the June 1 deprecation of CLAUDE_CODE_OPUS_4_6_FAST_MODE_OVERRIDE
2.classifier-gated execution — called 'auto mode' — is now available on AWS Bedrock, Google Vertex AI, and Azure Foundry
3.Provably-safe operations (read-only file access, low-risk Bash) → proceed without prompting
4.Versions below v2.1.156 mutate thinking blocks between turns. Opus 4.8 rejects this with deterministic API 400 errors

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