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v2.1.238 Claude Code Release Notes

Aug 20, 2026
Claude's Analysisby Sonnet 5
Full Analysis

Huge stability release: fixes a memory leak in long sessions plus 10+ Remote Control bugs (disconnects, stuck sessions, dropped messages), alongside terminal and MCP fixes.

Changes
39
Total Changes (vs Average)
3.1×
Version Type
Patch
Release Focus
Bug Fixes
Day Since Prior Release
1
Release # This Month
#17 of 19
Bug Fix Ratio
59%
Post-Release Edits
—
Change Category
Ecosystem Impact
MCP has appeared in 7 of the last 10 releases; this one adds headersHelper trust-dialog gating and credential isolation, continuing ongoing hardening of the MCP integration surface.
Key Themes
11Remote Control reliability overhaul|3Memory & session stability|5Terminal & input handling|5MCP protocol & security fixes|3Self-hosted runner & admin tooling
May Help If You've Noticed
Memory usage crept up steadily during very long coding sessions
Remote Control (phone/web) sessions dropped, went stale, or lost messages mid-task
Backspace stopped registering when held down over a slow SSH or mosh connection
Killing a paused (Ctrl+Z) session left your terminal cursor hidden or paste mode stuck
MCP permission or elicitation prompts showed blank for very long URLs

Changes in Claude Code v2.1.238

Added3 changes

  • •Added a keybindingFlavor setting: set it to "readline" to make Ctrl+W in the prompt delete back to the previous whitespace, as in Bash; the default ("classic") is unchanged
  • •Added claude self-hosted-runner --defer-shutdown-max-min <minutes>: on SIGTERM, keep serving attached sessions, park what is left after that many minutes, then exit
  • •Added claude self-hosted-runner --proxy-authorization-command / --proxy-authorization-file for egress proxies that require a freshly issued Proxy-Authorization header on every connection

Improved4 changes

  • •Improved startup: bare claude starts sooner on macOS
  • •Improved Bash tool permission checking for zsh-specific syntax in shell conditionals
  • •Improved Remote Control connection resilience: brief HTTP 403 refusals from a network edge, VPN, or proxy are now tolerated for up to 3 minutes, with the refusing party named when a block persists
  • •Improved startup responsiveness: the automatic update check now runs about 10 seconds after launch instead of competing with startup for CPU

Fixed23 changes

  • •Fixed unbounded memory growth in long interactive sessions: subagent tool results are now released once they leave the recent display window
  • •Fixed custom, project, and plugin output styles drifting back to the default voice mid-session
  • •Fixed CLAUDE_CODE_ENABLE_PROMPT_SUGGESTION=true not keeping prompt suggestions on when your account is near, but not over, its usage limit
  • •Fixed worktree-isolation Bash refusals telling you to remove a redirect when the command had none
  • •Fixed self-hosted runners occasionally being removed by the server after a single slow or lost poll request, handing their healthy session to another runner
  • •Fixed MCP elicitation dialogs showing nothing for URLs longer than 4,096 characters, and permission prompts dropping the "don't ask again" option when the project path didn't fit the terminal width
  • •Fixed leftover /tmp/claude-*-cwd files when a Bash command is killed, times out, or is interrupted
  • •Fixed held Backspace being ignored on terminals that send Ctrl+H for Backspace when keystrokes arrive in large bursts (slow SSH/mosh links)
  • •Fixed text-wrapping in permission prompt diffs: lines containing wide multi-code-point characters (such as emoji) or tabs are no longer clipped
  • •Fixed killing a suspended (Ctrl+Z) session sometimes leaving the terminal in bracketed-paste mode with the cursor hidden
  • •Fixed stdio MCP servers receiving a server/discover request before initialize, forcing lazy servers to start their backend on every session open
  • •Fixed a proxy's refusal of a connection being reported as a generic network error instead of naming the proxy
  • •Fixed the /model and /effort cache-miss warning appearing when the prompt cache had already expired
  • •Fixed per-task Stop from the Remote Control tasks panel doing nothing on CLI-hosted sessions
  • •Fixed remote sessions exiting when a client delivered a user message without a valid role
  • •Fixed Remote Control sessions started by claude remote-control inheriting session-scoped environment variables from the launching shell
  • •Fixed a Remote Control session whose process crashed staying unavailable until claude remote-control was restarted; it can now be reused when you next message it
  • •Fixed Remote Control messages sent from the web or Desktop while Claude is mid-turn disappearing from the transcript after the turn finishes
  • •Fixed Remote Control model picks made on a phone or web not updating the model shown in the terminal
  • •Fixed Remote Control disconnecting with "login expired" when a brief network hiccup delays renewing your sign-in; it now retries and stays connected
  • •Fixed Remote Control reporting a failed reconnect on sign-out; signing out now ends the session with a clear message
  • •Fixed ListAgents/SendMessage reporting "Remote Control is not connected" in sessions run by claude remote-control (server mode) or Desktop/IDE hosts; they now list and reach Remote Control peers
  • •Fixed ListAgents and SendMessage exposing the idle worker that the agent view pre-warms for your next background session; it now appears only once a task claims it

Changed3 changes

  • •Updated the bundled claude-api skill for the Managed Agents Aug 19 release: web search/fetch domain settings and memory stores on self-hosted sandboxes
  • •Changed Ctrl+L and Cmd+K in fullscreen to always just repaint — the double-press /clear shortcut was removed, and 1-row nvim terminals no longer trigger automatic /clear loops
  • •Changed claude mcp list and claude mcp get to show disabled servers as ⊘ Disabled instead of connecting to them for a health check

Other6 changes

  • •Plugin marketplaces: headersHelper on a url marketplace or a catalog entry runs a command that mints HTTP headers (e.g. a short-lived token) for catalog and same-origin archive fetches
  • •A catalog entry's headersHelper runs only when you install or update that plugin, after its command is shown; claude plugin install/update ask [y/N] (or pass -y)
  • •Cross-session messaging: sending to a session on this machine that refuses inbound messages (e.g. crossSessionInbound: "refuse") now reports "refused" to the sender instead of a silent success
  • •Cross-session messaging: a session whose inbox drops your messages (rate limit or full queue) now tells your session, instead of the messages vanishing silently
  • •MCP headersHelper in a project .mcp.json, and inline MCP servers in project or --add-dir agent files, now require that folder's trust dialog to have been accepted (also under claude -p)
  • •MCP headersHelper from a project .mcp.json, plugin, or agent file runs without inherited credential env vars; user, managed and claude.ai-scope helpers now run from the Claude config dir

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