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v2.1.80 Claude Code Release Notes

Mar 19, 2026
Claude's Analysisby Sonnet 4.6
Full Analysis

MCP --channels enables server-push messaging (preview); plugins gain inline settings and effort frontmatter. Resume now restores parallel tool calls; API proxy errors resolved.

Changes
17
Total Changes (vs Average)
1.0×
Version Type
Patch
Release Focus
Mixed
Day Since Prior Release
1
Release # This Month
#14 of 20
Bug Fix Ratio
35%
Post-Release Edits
—
Change Category
Ecosystem Impact
Plugins / Skills has appeared in 9 of the last 10 releases, signaling sustained extensibility investment. AWS Bedrock and Google Vertex return after a 5-release absence with a streaming fix, suggesting active provider parity work alongside the plugin push.
Key Themes
1MCP bidirectional push channels|4Plugin system authoring depth|4Session and streaming reliability|6Keyboard UX and observability
May Help If You've Noticed
Resumed sessions show '[Tool result missing]' where parallel tool outputs should appear
Voice mode disconnects unexpectedly or won't connect at all
Tool calls fail with errors when routed through an API proxy, Bedrock, or Vertex
Managed settings or workspace policies don't apply when starting a new session
Claude Code takes a long time to start or feels sluggish on a large codebase

Changes in Claude Code v2.1.80

Added5 changes

  • •Added rate_limits field to statusline scripts for displaying Claude.ai rate limit usage (5-hour and 7-day windows with used_percentage and resets_at)
  • •Added source: 'settings' plugin marketplace source — declare plugin entries inline in settings.json
  • •Added CLI tool usage detection to plugin tips, in addition to file pattern matching
  • •Added effort frontmatter support for skills and slash commands to override the model effort level when invoked
  • •Added --channels (research preview) — allow MCP servers to push messages into your session

Improved5 changes

  • •Improved responsiveness of @ file autocomplete in large git repositories
  • •Improved /effort to show what auto currently resolves to, matching the status bar indicator
  • •Improved /permissions — Tab and arrow keys now switch tabs from within a list
  • •Improved background tasks panel — left arrow now closes from the list view
  • •Reduced memory usage on startup in large repositories (~80 MB saved on 250k-file repos)

Fixed6 changes

  • •Fixed --resume dropping parallel tool results — sessions with parallel tool calls now restore all tool_use/tool_result pairs instead of showing [Tool result missing] placeholders
  • •Fixed voice mode WebSocket failures caused by Cloudflare bot detection on non-browser TLS fingerprints
  • •Fixed 400 errors when using fine-grained tool streaming through API proxies, Bedrock, or Vertex
  • •Fixed /remote-control appearing for gateway and third-party provider deployments where it cannot function
  • •Fixed /sandbox tab switching not responding to Tab or arrow keys
  • •Fixed managed settings (enabledPlugins, permissions.defaultMode, policy-set env vars) not being applied at startup when remote-settings.json was cached from a prior session

Other1 change

  • •Simplified plugin install tips to use a single /plugin install command instead of a two-step flow

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