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v2.1.247 Claude Code Release Notes

Aug 26, 2026
Claude's Analysisby Sonnet 5
Full Analysis

Broad stability pass fixes hangs, unbounded memory growth, terminal input glitches, and background/cloud session failures; adds a new /feedback tool for bug reports.

Changes
33
Total Changes (vs Average)
2.4×
Version Type
Patch
Release Focus
Bug Fixes
Day Since Prior Release
1
Release # This Month
#24 of 28
Bug Fix Ratio
58%
Post-Release Edits
—
Change Category
Ecosystem Impact
Bedrock, Vertex, and Foundry keep surfacing together (4 of last 10 releases each), reflecting sustained parity work aligning MCP error handling and Admin API coverage across all model-provider surfaces.
Key Themes
8Hang & Memory Stability Fixes|4New Capabilities: Feedback & Cost Tools|5Cloud & Background Session Reliability|5Provider & Model Plumbing|5Terminal & Plugin Hardening
May Help If You've Noticed
Session hangs or freezes with "Prompt is too long" after a noisy hook or background task
A background session shows "opening…" forever and never becomes usable
Keyboard shortcuts stop working when typing in Cyrillic or other non-Latin layouts
Garbled text like <35;150;7M appears in your prompt after moving the mouse
A cloud session goes silent with no progress after your machine or container restarts

Changes in Claude Code v2.1.247

Added4 changes

  • •Added the SendFeedback tool: when something goes wrong in a session, Claude can draft a feedback report for you to review and send from /feedback (turn off with the feedbackDrafts setting)
  • •Added {id, text, cooldownSessions, priority} entries, tipsFile, and label to spinnerTipsOverride, so organizations can rotate their own tips alongside the built-in ones
  • •Added a tip on Bash permission prompts pointing to auto mode, with a one-keystroke "Yes, and switch to auto mode" option
  • •Added /claude-api cost-optimize to profile an existing project's Claude API spend and work through cost levers (caching, token hygiene, batch, effort, model choice) one measured change at a time

Improved2 changes

  • •Improved plugin marketplace hardening: names containing control or invisible characters are rejected, and marketplace-supplied text in /plugin and claude plugin output is escape-safe
  • •Improved Bedrock, Vertex, and Foundry sessions (and any with telemetry disabled): Claude is now told when a configured MCP server failed to connect, instead of concluding its tools don't exist

Fixed19 changes

  • •Fixed fast arrow-key + Enter sequences acting on the row above the one you navigated to in history search, /config, /mcp, /skills, background tasks, and /model
  • •Fixed sub-agents dying on a first-call model 404: they now use the session's fallback model chain, and the error returned to the parent includes the error type, status, request id, and model
  • •Fixed a hook or background agent that printed megabytes of error output being able to overflow the conversation and wedge the session on "Prompt is too long"
  • •Fixed Ctrl keyboard shortcuts not firing under non-Latin (e.g. Cyrillic) keyboard layouts in kitty-protocol terminals
  • •Fixed text like <35;150;7M being inserted into the prompt when a mouse report arrived split across reads right after the escape prefix
  • •Fixed the Bash sandbox's after-command cleanup deleting a dotfile-managed ~/.claude/settings.json symlink (nix/home-manager, stow) when it is repointed outside the sandbox's writable area
  • •Fixed /terminal-setup overwriting your entire Zed keymap.json instead of merging in its keybinding
  • •Fixed /rename silently confirming when the session registry could not be updated; it now says other sessions may still show the old name
  • •Fixed /compact and "Summarize from here" in sessions started with --agent summarizing under the default system prompt instead of the conversation's own
  • •Fixed a background session showing "opening…" forever in claude agents after its terminal host process died; the row now fails within seconds with the reason, and Enter restarts it
  • •Fixed unbounded memory growth when a hook's or background task's output file could not be written; the file now notes where output was lost
  • •Fixed /install-github-app over SSH: the copy shortcut now says how the sign-in URL was copied instead of always claiming success, and the URL appears immediately when no browser can open
  • •Fixed shell commands carried over from the foreground logging an internal error or showing a misleading [exited with code -1] line when they finish in background sessions
  • •Fixed a version-less marketplace plugin's live cache directory being deleted and recreated on a second-scope install, which could disrupt a running session using it
  • •Fixed Remote Control sessions started with /remote-control not reporting the working-tree diff to connected clients
  • •Fixed self-hosted runner sessions reporting running before Claude Code had started, which could trigger a premature "Claude is waiting for your input" notification from the Claude desktop app
  • •Fixed first-run setup exiting with "Unable to connect to Anthropic services" when managed settings configure Claude apps gateway sign-in and Anthropic endpoints are unreachable
  • •Fixed cloud sessions (Claude Code on the web, desktop and mobile apps) sometimes showing the previous permission mode when you switch modes right after sending a message
  • •Fixed cloud sessions going silent when the session's container restarts between turns while a background agent, shell, or monitor is still running — the resumed session now reports the lost work

Changed8 changes

  • •Updated the /claude-api skill with Admin API coverage (organization members, invites, workspaces, API keys, rate limit reports, workload identity federation, CMEK)
  • •Changed Sonnet 5's default auto-compact window to its full 1M context, so sessions on the 1M window now auto-compact at about 967K tokens instead of about 934K
  • •Changed cross-session peer messages to collapse by default to a one-line Message from @<sender>: <first line> preview; Ctrl+O expands the full body
  • •Changed terminal hyperlinks in rendered markdown: link targets that point at a network or automounter path, contain a control character, or lead with an invisible character now render as plain text
  • •Changed the prompt-footer PR badge to skip its GitHub re-check on terminal refocus when the last check is under a minute old
  • •Changed analytics to stay off from startup, not only after login, when managed settings force gateway login or a custom OAuth deployment is configured
  • •Changed Claude apps gateway sign-in requests to identify Claude Code (a surface=claude_code device-authorization parameter and a claude-code/<version> User-Agent)
  • •Changed organization sign-in enforcement to exit at start when the administrator's managed settings cannot be read, even if host-supplied or per-user Windows registry settings exist

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