v1.0.27 Claude Code Release Notes

Jun 18, 2025

Claude's Analysisby Sonnet 4.6

Full Analysis

MCP gains Streamable HTTP, OAuth auth, and @-mention resources; /resume adds in-session conversation switching.

Changes

Total Changes (vs Average)

0.3×

Version Type

Patch

Release Focus

Mixed

Days Since Prior Release

Release # This Month

#13 of 24

Bug Fix Ratio

Post-Release Edits

Change Category

Ecosystem Impact

MCP changes have appeared in 4 of the last 10 releases, with this version delivering the most comprehensive MCP upgrade yet — combining transport, auth, and discoverability improvements simultaneously.

Key Themes

3MCP Protocol Maturity Leap|1Conversation Navigation

May Help If You've Noticed

Your MCP server uses HTTP streaming but Claude Code couldn't connect to it

Other4 changes

•Streamable HTTP MCP servers are now supported
•Remote MCP servers (SSE and HTTP) now support OAuth
•MCP resources can now be @-mentioned
•/resume slash command to switch conversations within Claude Code

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v1.0.27 Claude Code Release Notes

Jun 18, 2025

Claude's Analysisby Sonnet 4.6

Full Analysis

MCP gains Streamable HTTP, OAuth auth, and @-mention resources; /resume adds in-session conversation switching.

Changes

Total Changes (vs Average)

0.3×

Version Type

Patch

Release Focus

Mixed

Days Since Prior Release

Release # This Month

#13 of 24

Bug Fix Ratio

Post-Release Edits

Change Category

Ecosystem Impact

Key Themes

3MCP Protocol Maturity Leap|1Conversation Navigation

May Help If You've Noticed

Your MCP server uses HTTP streaming but Claude Code couldn't connect to it

Other4 changes

•Streamable HTTP MCP servers are now supported
•Remote MCP servers (SSE and HTTP) now support OAuth
•MCP resources can now be @-mentioned
•/resume slash command to switch conversations within Claude Code

v1.0.27 Claude Code Release Notes

Changes in Claude Code v1.0.27

Other4 changes

v1.0.27 Claude Code Release Notes

Changes in Claude Code v1.0.27

Other4 changes