Anthropic shipped Claude Code 2.1.281 on 2026-09-23 (@anthropic-ai/[email protected]): Claude apps gateway gains newer Desktop-key desktop policy fields, Bedrock assume_role (cross-account STS, optional per-developer sessions) plus guardrail:{id,version}, richer claude plugin validate MCP checks, and multiple resume/retry crash fixes.

Key Takeaways

  • ✓Upgrade with npm i -g @anthropic-ai/[email protected] (changelog dated 2026-09-23)
  • ✓Bedrock upstreams support assume_role via STS, including cross-account and optional per-developer sessions
  • ✓Optional guardrail: {id, version} on Bedrock upstreams — set on all Bedrock upstreams or none
  • ✓claude plugin validate flags silently-dropped .mcp.json entries, undeclared ${user_config.*}, and insecure URLs
  • ✓"attribution": false hides commit/PR attribution; older CLIs skip whole settings files that contain it
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claude plugin validate flags silently-dropped .mcp.json entries, undeclared ${userconfig.}, and insecure URLs
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Claude Code · Anthropic · Bedrock
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Project Links & Resources

Direct Access
Direct access to official project resources and documentation
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Claude Code v2.1.281 GitHub Release
github.com/anthropics/claude-code/releases/tag/v2.1.281
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Claude Code official changelog
docs.anthropic.com/en/docs/claude-code/changelog
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npm @anthropic-ai/claude-code
www.npmjs.com/package/@anthropic-ai/claude-code
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Claude Code docs home
docs.anthropic.com/en/docs/claude-code/overview
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In-Depth Technical Analysis

Core Background & Industry Pain Points

Enterprise Claude Code on Apps Gateway/Bedrock needs finer Desktop-key policy, cross-account IAM, and uniform Guardrails. 2.1.281 targets that gateway surface plus resume reliability.

Architecture Highlights & Internals

Desktop policy adds blockReadsOutsideWorkingDirectories and disableBypassPermissionsMode. Bedrock upstreams gain assume_role (STS, cross-account, optional per-developer sessions) and consistent guardrail:{id,version}. MCP URL-mode elicitation lands for 2026-07-28 protocol links; claude plugin validate catches silent .mcp.json drops.

Benchmarks & Measured Numbers

No new public coding-bench scores. Verified timestamps: GitHub 2026-09-23T19:19:15Z; npm ~2026-09-23T17:01Z; changelog matches the release notes.

Developer Getting Started

npm i -g @anthropic-ai/[email protected], configure Bedrock assume_role/guardrails, run claude plugin validate, and regression-test long-session resume. Keep shared settings compatible with older CLIs if using attribution: false.

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Up NextClaude Code 2.1.283: availableModelsMatch/deniedModels controls, gateway prompt-id headers, /doctor prompt-audit
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