Claude Code 2.1.86 release notes

Version

2.1.86

Released

27 March 2026

Status

Stable release

What's new in Claude Code 2.1.86

The official notes for Claude Code 2.1.86 list 26 changes: 2 new features, 14 fixes, 2 performance improvements and 8 other changes.

• 2 new features
• 14 fixes
• 2 performance improvements
• 8 other changes

Highlights

• new feature Added X-Claude-Code-Session-Id header to API requests so proxies can aggregate requests by session without parsing the body
• new feature Added .jj and .sl to VCS directory exclusion lists so Grep and file autocomplete don't descend into Jujutsu or Sapling…
• performance improvement Reduced startup event-loop stalls when many claude.ai MCP connectors are configured (macOS keychain cache extended from 5s to 30s)
• performance improvement Improved prompt cache hit rate for Bedrock, Vertex, and Foundry users by removing dynamic content from tool descriptions
• fix Fixed --resume failing with "tool_use ids were found without tool_result blocks" on sessions created before v2.1.85

Our short summary: changes are counted and classified automatically from the official notes, and highlights are shortened. The complete, authoritative list is in the official release notes on GitHub.

Full release notes on GitHub (Claude Code 2.1.86)

All Claude Code release notes · All releases

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