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v2.1.267 Claude Code Release Notes

Sep 9, 2026
Claude's Analysisby Sonnet 5
Full Analysis

New maxEffortLevel setting caps model effort across Bedrock/Vertex/Foundry; huge stability pass fixes 10+ prompt-cache breaks in MCP tool handling plus VS Code hangs.

Changes
53
Total Changes (vs Average)
3.9×
Version Type
Patch
Release Focus
Bug Fixes
Day Since Prior Release
1
Release # This Month
#9 of 9
Bug Fix Ratio
68%
Post-Release Edits
—
Change Category
Ecosystem Impact
MCP tool-list handling has driven fixes in 6 of the last 10 releases; this release alone closes 11 prompt-cache invalidation bugs tied to MCP reconnects, resumes, and model switches.
Key Themes
3Model effort controls|11Prompt-cache & MCP tool-state stability|9VS Code platform fixes|30Session, security & admin reliability
May Help If You've Noticed
Claude Code seemed to hang or slow down after switching models mid-conversation
VS Code froze at high CPU when editing or rewinding an earlier message
Pasting a screenshot on WSL showed garbled bytes instead of an image
Resuming a long conversation lost earlier tool results or reasoning
Login screen wouldn't close when you pressed Escape on a managed machine

Changes in Claude Code v2.1.267

Added2 changes

  • •Added maxEffortLevel setting (top-level or per model under modelSettings): caps the effort level on every provider, including Bedrock, Vertex and Foundry; users can still pick a lower level
  • •Added --system-prompt-snapshot off to render the system prompt fresh on every request instead of reusing the conversation's recorded prompt (for iterating on prompt text)

Improved7 changes

  • •Improved the /diff panel: it no longer flashes "0 files changed" and a spinner before settling, and its empty state is centered in the panel
  • •Improved the Bash tool's description guidance so Claude describes what a command does in plain words instead of echoing the command
  • •Improved sandbox guidance so Claude suggests /copy when clipboard commands such as pbcopy fail inside the sandbox
  • •Improved --resume first-render time for sessions with many Bash tool calls
  • •Improved prompt input responsiveness: keystrokes no longer occasionally wait a frame behind spinner or streaming repaints
  • •Improved prompt-cache stability: subagents and sessions started with --system-prompt or --append-system-prompt now record the system prompt and tool definitions once instead of re-rendering them
  • •Improved Artifact tool publish errors: when a publish is refused, the message now says why and what to do about it

Fixed36 changes

  • •Fixed Cowork scheduled tasks in the cloud failing at startup for organizations whose managed settings require sandboxing
  • •Fixed /context and other local command output rendering blank on mobile clients
  • •Fixed shift+enter and option+backspace not working after reconnecting to a tmux or ssh session inside an agent view
  • •Fixed the dim last-prompt header not appearing at the top of the conversation when scrolling up in fullscreen mode
  • •Fixed Workflow agent() calls with large output schemas being refused in auto mode instead of being checked by the safety classifier
  • •Fixed a case where a marketplace entry path containing a backslash could bypass the containment check for fetched marketplaces on macOS and Linux
  • •Fixed expired AWS or Google Cloud credentials under a host app such as Claude Desktop retrying ten times with a generic "request failed" before the re-authenticate error appeared
  • •Fixed resuming a session after /compact or another slash command ran via -p --resume: a spurious "Continue from where you left off." turn is no longer inserted
  • •Fixed resuming a large session (transcript over 5 MB): parallel tool calls and their hook output are no longer dropped from the reloaded conversation
  • •Fixed managed allowedHttpHookUrls, httpHookAllowedEnvVars and allowedChannelPlugins to admit nothing, not everything, when unreadable
  • •Fixed /login on machines whose managed settings require Claude apps gateway sign-in: Esc now closes the dialog instead of doing nothing
  • •Fixed artifact publishes cut off by a dropped connection mid-upload: they now retry once when Claude Code can tell the upload never completed, instead of reporting an unknown outcome
  • •Fixed effort: frontmatter on custom commands, skills, and subagents being ignored on models whose default effort is still pinned (Opus 4.7, Opus 4.8, Fable 5)
  • •Fixed artifact publish failing with an unhelpful error when the page file isn't valid UTF-8 or contains a replacement character (U+FFFD); the error now names the line and column to fix
  • •Fixed claude agents @ directory menu not listing repositories created after the session started
  • •Fixed Remote Control clients that join a Claude Desktop or VS Code session showing a stale permission mode until it was changed again
  • •Fixed claude remote-control exiting and dropping every attached session when its server credential expires (about 30 days after start); the host now re-registers and keeps going
  • •Fixed the usage-limit warning flickering on and off during a session when requests for different models or modes report different limit windows
  • •Fixed earlier reasoning being dropped when an MCP server re-sends, or a built-in tool re-renders, a tool the model already loaded
  • •Fixed a tool that disappears mid-conversation, from a disconnected MCP server or an upgrade, rewriting the tool list and discarding earlier thinking
  • •Fixed a background worker forked from a conversation adding EnterWorktree to the conversation's tool block mid-session, which broke prompt-cache reuse
  • •Fixed mid-session MCP and plugin tools being added to the tool list in sessions without ToolSearch, which broke prompt-cache reuse; supported models now receive them as deferred definitions
  • •Fixed switching models with /model re-sending every tool definition (a prompt-cache miss); commit and PR attribution text now arrives as a conversation note that updates on model changes
  • •Fixed resumed sessions rewriting the inline tool set when an MCP connector reconnects at a different moment than before
  • •Fixed resumed sessions re-rendering tool descriptions instead of replaying the recorded ones when the first turn ran a tool
  • •Fixed prompt-cache misses and dropped extended thinking when a claude.ai connector's tools change between a session and its resume
  • •Fixed resumed sessions rewriting earlier MCP tool announcements (and dropping extended thinking) before their connectors reconnect
  • •Fixed a prompt-cache break when a print-mode (-p) conversation is resumed interactively: the system prompt prefix no longer changes
  • •[VSCode] Fixed the extension host hanging at 100% CPU when forking, editing an earlier message, or rewinding in a conversation whose saved transcript contains a cyclic parent link
  • •[VSCode] Fixed pasting a screenshot on WSL2/WSLg inserting raw image bytes into the chat input; the image is now attached when the clipboard provides it, otherwise the paste is ignored
  • •[VSCode] Fixed chat diff blocks always rendering with a dark editor theme; they now follow the active VS Code color theme, including high contrast
  • •[VSCode] Fixed mixed right-to-left and English text rendering in the wrong order while typing in the message input
  • •[VSCode] Fixed accepting an edit in the diff view on a file with Windows (CRLF) line endings failing with "String not found in file"
  • •[VSCode] Fixed @-mentions dropping files whose paths contain spaces
  • •[VSCode] Fixed the sessions list view failing to load in windows connected over Remote-SSH when the workspace folder exists only on the remote host
  • •[VSCode] Fixed runaway ripgrep processes when viewing files in large or symlink-heavy workspaces

Other8 changes

  • •Self-hosted runner: Changed --use-anthropic-git-proxy to be reported to the server at registration and to print a warning for each session that still clones through the legacy git proxy
  • •Gateway: Changed forward_user_identity upstreams to return a 429 as-is to a developer whose email was forwarded, instead of failing over to the next upstream, so the proxy's per-user limits hold
  • •[Claude Code on the web] Fixed GitHub Enterprise Server sessions showing your GitHub account as disconnected once its token expired; PR and issue operations now refresh it automatically
  • •[Claude Code on the web] Fixed gh and GitHub API calls failing in organizations without the Claude GitHub App; they now use your connected GitHub account and say so when none is connected
  • •[Claude Tag] Added a "Use a custom connector" link to the preset connection forms in Claude Tag admin settings, so you can switch to a custom connection without starting over
  • •[Claude Tag] Fixed Claude replying "The API rejected the request as invalid" when the organization has run out of usage credits; the reply now says so and explains how to add more
  • •[Claude Tag] Fixed thread requests to edit or delete a message Claude posted at the channel's top level being answered with a correction instead of reaching the session that posted it
  • •[Claude Tag] Fixed **Connect** on Tool access requests under Admin settings > Review requests failing with "Authorization failed" or showing the requested access bundle as deleted

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