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The Claude Code Changelog · Yesterday · 4 min

Custom Deployment Prompts and Guardrails in Claude Code 2.1.312

Learn about changes in Claude Code 2.1.312 that alter default system prompts and refusal fallback behaviors for custom model deployment names on Bedrock, Vertex, Foundry, and Mantle. We also cover crucial updates to hook concurrency limits, subagent compaction settings, and a fix preventing accidental overwrites of large CLAUDE.md files.

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Learn about changes in Claude Code 2.1.312 that alter default system prompts and refusal fallback behaviors for custom model deployment names on Bedrock, Vertex, Foundry, and Mantle. We also cover crucial updates to hook concurrency limits, subagent compaction settings, and a fix preventing accidental overwrites of large CLAUDE.md files.

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