Claude Code Changelog

UNOFFICIAL – but tolerated – bot posting Claude Code CLI, feature flag & prompt changes. Full CC history in github repo.

[Claude Code Changelog @ClaudeCodeLog]

Claude Code 2.1.217 additional updates

CLI surface:
Removed:
• env vars: TEST_ENABLE_SESSION_PERSISTENCE

File: https://t.co/5CCMNbWsFJ

Metadata:
• Time since 2.1.216 release: 1d 0h 3m 10s
• Bundle file size: +222.6 kB (+0.6%)

• Prompt files: +3 (+17.6%)
• Prompt tokens: +7,002 (+27.7%)

Prompt token mix by kind:
• system: 52.3%→56.7%
• tools: 47.7%→43.3%

Files:
• metadata: https://t.co/nGc1xxVl0r
• prompt stats: https://t.co/yKbnFH90TT

Other prompt/string highlights:
1) Clarified grep tool docs to note it’s a ripgrep-based search tool, recommend using Grep for search tasks, and refine the output_mode, head_limit, and offset parameter descriptions.

Links:
1) https://t.co/bwkKiNr7AE

More details: https://t.co/jcVRr1bmKl

[Claude Code Changelog @ClaudeCodeLog]

Claude Code 2.1.217 has been released.

20 CLI changes

Highlights:
• Prompts instruct use of the ripgrep-backed Grep tool for search tasks, yielding faster, more accurate results
• Added warnings when transcript writes fail (e.g. disk full) or session saving is disabled to avoid silent loss
• Limit concurrent subagents to 20 (default), configurable via env var, to prevent unbounded agent fan-out

Complete details in thread ↓

[Claude Code Changelog @ClaudeCodeLog]

Claude Code CLI 2.1.217 changelog:

New features:
• Added emoji shortcode autocomplete in the prompt input: type :heart: to insert ❤️, or :hea for suggestions — disable with the emojiCompletionEnabled setting
• Added warnings when transcript writes are failing (e.g. disk full) or when session saving is off due to an inherited environment variable, instead of losing transcripts silently
• Added a cap on concurrently-running subagents (default 20, override with CLAUDE_CODE_MAX_CONCURRENT_SUBAGENTS) so one message can't fan out unbounded background agents

Fixes:
• Fixed a memory leak where truncated MCP tool outputs kept the full untruncated result in memory for the rest of the session
• Fixed Windows auto-update failures that could leave claude.exe missing; failed updates now restore the preserved executable automatically
• Fixed background session isolation not canonicalizing symlinked working directories, which could let sessions escape their workspace folder
• Fixed auto-compact never triggering for Claude Opus 4.8 on Bedrock and /compact failing once over the limit
• Fixed corporate mTLS, TLS-verify, OAuth scope, and proxy settings being ignored in Claude Desktop sessions
• Fixed screen reader mode's startup announcement being cut off by the first prompt render, and the thinking status row re-rendering every few seconds to update elapsed time and token counts
• Fixed managed settings that set OTEL_EXPORTER_OTLP_ENDPOINT not governing all signals — lower-scope signal-specific overrides no longer redirect telemetry away from the managed endpoint
• Fixed --resume/--continue and /resume failing with a TypeError when a transcript has a malformed attachment entry
• Fixed Remote Control sessions not showing a pending permission prompt or dialog to viewers that connected after it appeared
• Fixed background shells sometimes becoming impossible to stop after a session is sent to the background (/background or ←) or when the session exits on a heavily loaded machine, most visible on Windows
• Fixed a CLAUDE.md or SKILL.md paths frontmatter value with many brace groups OOM-killing or stalling the CLI at startup — brace expansion is now budget-bounded
• Fixed the transcript preview sitting flush against the input area when attaching to a starting background session; it now leaves the same one-line gap as the live layout, so the transcript no longer shifts when the session takes over
• Fixed --max-budget-usd not stopping background subagents: once the cap is reached, new spawns are denied and running background agents are halted

Improvement:
• Improved footer PR badge links to be clickable hyperlinks even when terminal support can't be detected (e.g. over ssh/tmux); set FORCE_HYPERLINK=0 to opt out

Other changes:
• Changed the login-expiry warning to appear 3 days before expiry instead of 5
• Capped the frontend-design plugin suggestion tip at 3 lifetime impressions instead of repeating indefinitely
• Changed subagents to no longer spawn nested subagents by default; set CLAUDE_CODE_MAX_SUBAGENT_SPAWN_DEPTH to allow deeper nesting

Source: https://t.co/0e4JwaCMBJ

[Claude Code Changelog @ClaudeCodeLog]

Claude Code 2.1.217 is about to be released
#cccnext

[Claude Code Changelog @ClaudeCodeLog]

Claude Code 2.1.216 additional updates

CLI surface:
Added:
• models: claude-code-guide

Removed:
• models: claude-code-guideG

File: https://t.co/4mJQF7xfzz

Metadata:
• Time since 2.1.215 release: 1d 18h 31m 5s
• Bundle file size: +332.7 kB (+0.9%)

• Prompt files: +2 (+13.3%)
• Prompt tokens: +3,099 (+14.0%)

Prompt token mix by kind:
• system: 38.4%→52.3%
• tools: 61.6%→47.7%

Files:
• metadata: https://t.co/xLOqD6UyqR
• prompt stats: https://t.co/Ay27aaDtXs

Other prompt/string highlights:
1) Documents that the write tool writes files to the local filesystem.

Links:
1) https://t.co/kRPNcEPj5B

More details: https://t.co/wp2bPNT7k4

[Claude Code Changelog @ClaudeCodeLog]

Claude Code 2.1.216 is now available.

40 CLI changes, 1 system prompt change

Highlights:
• Added sandbox.filesystem.disabled setting to skip filesystem isolation while keeping network egress control
• Fixed quadratic message normalization in long sessions, preventing multi-second stalls on resume
• Resumed background agent sessions restore agent prompt and tool restrictions to preserve configured behavior

Complete details in thread ↓

[Claude Code Changelog @ClaudeCodeLog]

Claude Code 2.1.216 system prompt updates

Notable changes:
1) Claude no longer sees a stray Bun HMR error about adding https://t.co/fsmgq9eZed.accept. Removing this unrelated log line reduces prompt noise and lowers the chance Claude treats it as a required action or shifts the conversation toward frontend hot-reload fixes.

Links:
1) https://t.co/SYUewICxqO

[Claude Code Changelog @ClaudeCodeLog]

Claude Code 2.1.216 is about to be released
#cccnext

[Claude Code Changelog @ClaudeCodeLog]

Claude Code 2.1.215 additional modifications

CLI surface:
Added:
• models: claude-code-guideG

Removed:
• models: claude-code-guide

File: https://t.co/fjLNvQfT7o

Metadata:
• Time since 2.1.214 release: 1d 0h 36m 14s
• Bundle file size: -48.8 kB (-0.1%)

• Prompt files: +2 (+15.4%)
• Prompt tokens: +6,001 (+37.2%)

Prompt token mix by kind:
• tools: 74.0%→61.6%
• system: 26.0%→38.4%

Files:
• metadata: https://t.co/zB08BxBXs2
• prompt stats: https://t.co/XazPkjU15D

Other prompt/string highlights:
1) Assistant will now always use the grep search tool for search tasks.
2) Clarifies that the write tool writes files to the local filesystem.

Links:
1) https://t.co/Ozd9dlPrgH
2) https://t.co/G90PSKIrtz

More details: https://t.co/gTJsS1HRJV

[Claude Code Changelog @ClaudeCodeLog]

Claude Code 2.1.215 has been released.

1 CLI change

Highlights:
• Documentation designates ripgrep as the primary search tool for faster, more consistent codebase searches
• Skills /verify and /code-review no longer auto-run; they need explicit invocation to avoid unsolicited checks

Full details in the thread ↓

[Claude Code Changelog @ClaudeCodeLog]

Claude Code CLI 2.1.215 changelog:

Other change:
• Claude no longer runs the /verify and /code-review skills on its own; invoke them with /verify or /code-review when you want them

Source: https://t.co/H1A7WaZFZn

[Claude Code Changelog @ClaudeCodeLog]

Claude Code 2.1.215 is about to be released
#cccnext

[Claude Code Changelog @ClaudeCodeLog]

Claude Code 2.1.214: additional changes

CLI surface:
Removed:
• models: claude-code-github-actionj

File: https://t.co/uPzGz6fnuQ

Metadata:
• Time since 2.1.213 release: 2h 25m 30s
• Bundle file size: +6.9 kB (+0.0%)

• Prompt files: -18 (-58.1%)
• Prompt tokens: -92,279 (-85.1%)

Prompt token mix by kind:
• tools: 14.3%→74.0%
• system: 33.1%→26.0%
• system-reminder: 52.6%→0.0%

Files:
• metadata: https://t.co/F11XU98LQ2
• prompt stats: https://t.co/NGJKdUipqo

Other prompt/string highlights:
1) Edit tool now documented to perform exact string replacements in files, with guidance to use replace_all for renaming.

Links:
1) https://t.co/4gHbnyuwHJ

More details: https://t.co/skNUXuIKA3

[Claude Code Changelog @ClaudeCodeLog]

Claude Code 2.1.214 has been released.

47 CLI changes

Highlights:
• Added EndConversation tool to end sessions with abusive users or jailbreak attempts and halt interaction
• Added permission prompts for Docker/Podman daemon-redirect flags to prevent accidental remote daemon access
• Edit tool makes literal string replacements in files so edits affect only exact specified text, not patterns

Complete details available in thread ↓

[Claude Code Changelog @ClaudeCodeLog]

Claude Code CLI 2.1.214 changelog:

New features:
• Added the EndConversation tool: Claude can end sessions with highly abusive users or jailbreak attempts, as on https://t.co/ldz5BaC3j0 since 2025 — see https://t.co/kySFQpxpsf
• Added a periodic progress heartbeat for long-running tool calls that previously went silent
• Added an ISO modified timestamp to memory file frontmatter
• Added message.uuid, client_request_id, and tool_source attributes to OpenTelemetry log events for message-level correlation and tool provenance
• Added CLAUDE_CODE_OTEL_CONTENT_MAX_LENGTH to configure the 60 KB truncation limit on OpenTelemetry content attributes
• Added reasoning effort to the subagentStatusLine payload, so custom agent rows can render model and effort
• Added permission prompts for docker commands (including the Podman docker shim) carrying daemon-redirect flags (--url, --connection, --identity, and Podman's remote mode) that previously ran without one

Fixes:
• Fixed single-segment dir/ allow rules like Edit(src/) auto-approving writes to nested dir/ directories anywhere in the tree instead of only <cwd>/dir
• Fixed a permission-check bypass affecting commands run in Windows PowerShell 5.1 sessions
• Fixed Bash permission checks to fail closed on file-descriptor redirect forms that bash parses differently than the permission analyzer
• Fixed Bash permission checks misjudging very long commands — commands over 10,000 characters now always prompt instead of running automatically
• Fixed Bash permission checks treating zsh variable subscripts and modifiers in [[ ]] comparisons as inert text — these commands now prompt for approval
• Fixed Bash permission checks to no longer auto-approve certain help and man commands that could run unsafe options, command substitutions, or backslash paths
• Fixed permission prompts on remote sessions that could proceed before the local confirmation dialog
• Fixed a crash when a GrowthBook feature evaluates to null, and a bug where a malformed flag payload could wipe the cached feature flags
• Fixed Bash tool killing the Claude session when a pkill -f pattern accidentally matched the CLI's own process (Linux)
• Fixed unbounded memory growth when --settings points at a device file or multi-GB file; oversized (>2 MiB) settings files now fail at startup with a clear error
• Fixed streaming turns failing with "Socket is closed" behind corporate proxies on Windows
• Fixed stream-json output truncation at exit for slow-reading SDK/pipeline consumers; the exit drain now scales with queued bytes instead of a flat 2s cap
• Fixed scheduled tasks refusing their own configured prompt as untrusted input — the fired prompt is now delivered as the session's assigned task
• Fixed PowerShell tool commands hanging until timeout when a child process waited on standard input (Windows)
• Fixed Python scripts under the PowerShell tool crashing with UnicodeDecodeError when reading non-UTF-8 data from standard input (Windows)
• Fixed Python scripts run via the PowerShell tool crashing with UnicodeEncodeError on non-ASCII output, and PowerShell 7 error messages containing raw ANSI escape sequences (Windows)
• Fixed the PowerShell tool reporting where.exe, fc.exe, and diff.exe as errors when they return a valid negative answer (Windows)
• Fixed > and >> under the PowerShell tool on Windows PowerShell 5.1 writing UTF-16LE files that other tools couldn't read as UTF-8
• Fixed a displaced background daemon deleting its successor's control socket on shutdown, which made the next client kill the healthy replacement daemon
• Fixed background sessions parked with ← or /background and left idle keeping the background daemon and a worker process alive indefinitely
• Fixed completed background sessions being impossible to remove via claude rm or the agent view once the background service had gone idle
• Fixed background sessions dispatched from a non-git folder being impossible to delete from the agents view
• Fixed reopening a stopped background session failing to restore its saved conversation when an unreadable folder exists in the session store
• Fixed the Remote Control "session ready" push notification firing for sessions where Remote Control was not explicitly enabled
• Fixed /install-github-app and the /mcp settings menu being blocked in agent-view sessions — they're now refused only in background sessions with no terminal attached
• Fixed plugins enabled via the --settings CLI flag not loading (regression since v2.1.181)
• Fixed feature flags going stale in long-running sessions after the OAuth token rotates
• Fixed /ultrareview refusing to run in repos with no merge base — it now offers to review all tracked files
• Fixed claude update and claude doctor hanging silently, and the /status System diagnostics section going blank, when a shell-config path is a directory
• Fixed memory frontmatter values being silently truncated at an inline # when memory files are saved
• Fixed session cost and token telemetry double-counting on streams that emit multiple cumulative message_delta frames
• Fixed a spurious "check your network" warning that appeared while the advisor was thinking
• Fixed hooks with exit code 2 not blocking as documented when the hook's stdout JSON fails schema validation
• Fixed OTel log events emitted outside the turn's async context missing the interaction span's trace context
• Fixed MCP transient errors during prompts/resources refresh clearing the server's slash commands and resources

Improvement:
• Improved the claude rc workspace-trust error in the home directory to say trust there is never saved and to suggest running from a project directory

Security/safety changes:
• Changed single-segment dir/ hook if: conditions to match only <cwd>/dir; write /dir/ for any-depth matching. deny/ask permission rules keep their any-depth match.
• Changed file commands using -m/--magic-file or -f/--files-from to require permission instead of being auto-allowed as read-only

Other changes:
• Changed keep-alive connection pooling to disable after a stale-connection error, so retries open a fresh socket
• Changed SessionStart hooks to report source "fork" when a session begins as a fork instead of "resume"

Source: https://t.co/r0AVEskMkU

[Claude Code Changelog @ClaudeCodeLog]

Claude Code 2.1.214 is about to be released
#cccnext

[Claude Code Changelog @ClaudeCodeLog]

Claude Code 2.1.213 is about to be released
#cccnext

[Claude Code Changelog @ClaudeCodeLog]

Claude Code 2.1.212 additional updates

CLI surface:
Added:
• commands: reset

Removed:
• env vars: ANTHROPIC_AWS_WORKSPACE_ID, ANTHROPIC_BETAS, ANTHROPIC_CUSTOM_MODEL_OPTION, ANTHROPIC_CUSTOM_MODEL_OPTION_DESCRIPTION, ANTHROPIC_CUSTOM_MODEL_OPTION_NAME, ANTHROPIC_DEFAULT_HAIKU_MODEL_DESCRIPTION, ANTHROPIC_DEFAULT_HAIKU_MODEL_NAME, ANTHROPIC_DEFAULT_OPUS_MODEL, ANTHROPIC_DEFAULT_SONNET_MODEL, ANTHROPIC_DEFAULT_SONNET_MODEL_DESCRIPTION, ANTHROPIC_DEFAULT_SONNET_MODEL_NAME, ANTHROPIC_FOUNDRY_BASE_URL, ANTHROPIC_FOUNDRY_RESOURCE, CCR_ENABLE_BUNDLE, CCR_FORCE_BUNDLE, CLAUDE_CODE_ACCOUNT_TAGGED_ID, CLAUDE_CODE_ADDITIONAL_DIRECTORIES_CLAUDE_MD, CLAUDE_CODE_ALWAYS_ENABLE_EFFORT, CLAUDE_CODE_API_KEY_HELPER_TTL_MS, CLAUDE_CODE_BASE_REF, CLAUDE_CODE_CLIENT_KEY, CLAUDE_CODE_DIAGNOSTICS_FILE, CLAUDE_CODE_DISABLE_1M_CONTEXT, CLAUDE_CODE_DISABLE_ADVISOR_TOOL, CLAUDE_CODE_DISABLE_ALTERNATE_SCREEN, CLAUDE_CODE_DISABLE_ATTACHMENTS, CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS, CLAUDE_CODE_DISABLE_LEGACY_MODEL_REMAP, CLAUDE_CODE_DISABLE_OFFICIAL_MARKETPLACE_AUTOINSTALL, CLAUDE_CODE_EMIT_SESSION_STATE_EVENTS, CLAUDE_CODE_ENABLE_EXPERIMENTAL_ADVISOR_TOOL, CLAUDE_CODE_ENABLE_GATEWAY_MODEL_DISCOVERY, CLAUDE_CODE_ENABLE_PROXY_AUTH_HELPER, CLAUDE_CODE_ENABLE_SDK_FILE_CHECKPOINTING, CLAUDE_CODE_ENABLE_TASKS, CLAUDE_CODE_ENABLE_TOKEN_USAGE_ATTACHMENT, CLAUDE_CODE_EXIT_AFTER_STOP_DELAY, CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS, CLAUDE_CODE_FORCE_MID_CONVERSATION_SYSTEM, CLAUDE_CODE_FORCE_TIP_ID, CLAUDE_CODE_GIT_BASH_PATH, CLAUDE_CODE_GLOB_TIMEOUT_SECONDS, CLAUDE_CODE_LOOP_PERSISTENT, CLAUDE_CODE_MAX_CONTEXT_TOKENS, CLAUDE_CODE_NATIVE_CURSOR, CLAUDE_CODE_OAUTH_TOKEN_FILE_DESCRIPTOR, CLAUDE_CODE_OTEL_FLUSH_TIMEOUT_MS, CLAUDE_CODE_OTEL_SHUTDOWN_TIMEOUT_MS, CLAUDE_CODE_PERFETTO_TRACE, CLAUDE_CODE_PLAN_V2_AGENT_COUNT, CLAUDE_CODE_PLAN_V2_EXPLORE_AGENT_COUNT, CLAUDE_CODE_PLUGIN_GIT_TIMEOUT_MS, CLAUDE_CODE_PLUGIN_KEEP_MARKETPLACE_ON_FAILURE, CLAUDE_CODE_PLUGIN_PREFER_HTTPS, CLAUDE_CODE_PLUGIN_SEED_DIR, CLAUDE_CODE_PLUGIN_USE_ZIP_CACHE, CLAUDE_CODE_POWERSHELL_RESPECT_EXECUTION_POLICY, CLAUDE_CODE_PROFILE_STARTUP, CLAUDE_CODE_PROXY_AUTH_HELPER_TTL_MS, CLAUDE_CODE_PROXY_RESOLVES_HOSTS, CLAUDE_CODE_PWSH_PARSE_TIMEOUT_MS, CLAUDE_CODE_REMOTE_SEND_KEEPALIVES, CLAUDE_CODE_RESUME_PROMPT, CLAUDE_CODE_SANDBOXED, CLAUDE_CODE_SESSIONEND_HOOKS_TIMEOUT_MS, CLAUDE_CODE_SESSION_LOG, CLAUDE_CODE_SESSION_NAME, CLAUDE_CODE_SKIP_FAST_MODE_NETWORK_ERRORS, CLAUDE_CODE_SKIP_FAST_MODE_ORG_CHECK, CLAUDE_CODE_TASK_LIST_ID, CLAUDE_CODE_TMUX_PREFIX, CLAUDE_CODE_TMUX_PREFIX_CONFLICTS, CLAUDE_CODE_TMUX_SESSION, CLAUDE_CODE_USE_COWORK_PLUGINS, CLAUDE_CODE_WORKSPACE_HOST_PATHS, CLAUDE_ENV_FILE, COLORFGBG, DEBUG_CLAUDE_AGENT_SDK, DEMO_VERSION, DISABLE_INTERLEAVED_THINKING, ENABLE_BETA_TRACING_DETAILED, FORCE_AUTOUPDATE_PLUGINS, GITHUB_ACTOR, GITHUB_ACTOR_ID, GITHUB_REPOSITORY, GITHUB_REPOSITORY_ID, GITHUB_REPOSITORY_OWNER, GITHUB_REPOSITORY_OWNER_ID, ITERM_SESSION_ID, LANG, LC_ALL, LC_TIME, LOCAL_BRIDGE, MAX_MCP_OUTPUT_TOKENS, OTEL_EXPORTER_OTLP_LOGS_PROTOCOL, OTEL_EXPORTER_OTLP_METRICS_PROTOCOL, OTEL_EXPORTER_OTLP_PROTOCOL, OTEL_EXPORTER_OTLP_TRACES_PROTOCOL, OTEL_LOGS_EXPORTER, OTEL_LOG_USER_PROMPTS, OTEL_METRICS_EXPORTER, OTEL_METRIC_EXPORT_INTERVAL, OTEL_TRACES_EXPORTER, OTEL_TRACES_EXPORT_INTERVAL, PWD, SYSTEMROOT, TERMINAL, TMUX_PANE, TRACEPARENT, TRACESTATE, USERNAME, USE_API_CONTEXT_MANAGEMENT, USE_LOCAL_OAUTH, USE_STAGING_OAUTH
• models: claude-bg-, opus-on-pro-near-limit

File: https://t.co/BUEzZOiLHK

Metadata:
• Time since 2.1.211 release: 1d 0h 5m 53s
• Bundle file size: +1,032.0 kB (+2.9%)

• Prompt files: -2 (-6.7%)
• Prompt tokens: +2,665 (+2.7%)

Prompt token mix by kind:
• system-reminder: 58.2%→56.6%
• system: 24.3%→29.4%
• tools: 17.6%→13.9%

Files:
• metadata: https://t.co/ZtaFVzyL3O
• prompt stats: https://t.co/WKgD8vUmyA

Other prompt/string highlights:
1) Runs a given Bash command and returns its output.
2) Edit tool now explicitly requires preserving the exact tabs/indentation after line-number prefixes when editing and clarifies the schema field expects a URL.
3) Clarifies that the write tool writes files to the local filesystem.

Links:
1) https://t.co/npfnspGeDK
2) https://t.co/djKe4jsgj5
3) https://t.co/6dWiyZLKwz

More details: https://t.co/BI0luSaKy6

[Claude Code Changelog @ClaudeCodeLog]

Claude Code 2.1.212 has been released.

48 CLI changes

Highlights:
• /fork now copies a conversation into a new background session row in claude agents so work continues
• Added a tool to run user-specified Bash commands and return output, enabling in-session shell automation
• Agent now prefers a ripgrep-backed Grep tool for searches, giving faster, more accurate file searches

Full details available in thread ↓

[Claude Code Changelog @ClaudeCodeLog]

Claude Code CLI 2.1.212 changelog:

New features:
• Added claude auto-mode reset to restore the default auto-mode configuration, with a confirmation prompt (pass --yes to skip)
• Added a session-wide limit on WebSearch tool calls (default 200, tunable via CLAUDE_CODE_MAX_WEB_SEARCHES_PER_SESSION) to stop runaway search loops
• Added a per-session cap on subagent spawns (default 200, override with CLAUDE_CODE_MAX_SUBAGENTS_PER_SESSION) to stop runaway delegation loops; /clear resets the budget

Fixes:
• Fixed plan mode auto-running file-modifying Bash commands (e.g. touch, rm) without a permission prompt or SDK canUseTool callback
• Fixed worktree creation following a repository-committed symlink at .claude/worktrees, which could create files outside the repository
• Fixed a continue:false hook's halt being dropped when the tool fails or completes mid-stream, and hook infrastructure errors being misreported as user rejections
• Fixed SIGTERM during a running Bash tool orphaning the command's process tree in print/SDK mode; the CLI now aborts the turn, kills the tree, and exits 143
• Fixed /background and claude --bg failing with "EUNKNOWN: unknown error, uv_spawn" on Windows when Group Policy blocks PowerShell 5.1; the daemon now prefers PowerShell 7
• Fixed shell mode (!) not executing commands containing file paths while the path autocomplete popup was open
• Fixed auto-mode denial notifications rendering broken characters when a long denial reason was truncated mid-emoji
• Fixed Ctrl+J not inserting a newline in the agent view dispatch input on terminals with extended key reporting, and surfaced the newline shortcut in the ? help overlay
• Fixed /ultrareview rejecting PR references like #123, PR 123, and pasted PR URLs; error hints now name the command you actually typed
• Fixed /ultrareview <branch> not fetching the branch from origin when it exists remotely; it now suggests the closest branch name on typos
• Fixed /ultrareview skipping the billing confirmation in a new conversation after /clear
• Fixed /ultrareview's "not a git repository" error on Claude Desktop now suggesting the project's repository folder instead of terminal commands
• Fixed hosted (host-managed) sessions failing at startup when repository settings configured mTLS certs, extra CA bundles, or OAuth scopes; these transport settings are now ignored with a warning
• Fixed a spurious "File has not been read yet" error when editing a file that had been read with offset/limit before resuming a session
• Fixed ExitWorktree failing with "no active EnterWorktree session" after resuming a session with --continue/--resume in print/SDK mode
• Fixed the workflow agent grid staying empty for Remote Control clients that join a session mid-run
• Fixed streaming-mode control requests being marked complete before their handler finished, which could lose the request on session restart
• Fixed background sessions created with /fork losing their live-parent protection after a state write failure
• Fixed reopening a stopped background session from the agent view failing silently — it now resumes the session, or shows why it can't and lets you force a restart
• Fixed agent teams: a stopping teammate could send the leader duplicate idle notifications when team initialization re-ran within a session
• Fixed the plan-approval dialog footer splitting "ctrl+g to edit in <editor>" apart when the file path is long
• Fixed the welcome banner keeping its old panel widths after a combined width+height terminal resize in fullscreen mode
• Fixed diff previews losing their line numbers and +/- markers in narrow layouts
• Fixed @-mentions attaching nothing after a partial file read, plugin uninstall targeting the wrong marketplace, and false "Command timed out" on exit code 143
• Fixed OpenTelemetry HTTP exports being rejected with 411/400 by Azure Monitor and other endpoints that don't accept chunked transfer encoding
• Fixed OTLP event log records missing trace_id/span_id when TRACEPARENT is set in SDK/headless mode
• Fixed conversations with many images incorrectly failing with "Request too large" errors, and improved the error message to explain the actual cause
• Fixed web search and web fetch returning "API Error" text as search results or page content when the API was overloaded
• Corrected an earlier release note (2.1.200): tmux through the 3.6 series lacks synchronized output; newer tmux with support is detected automatically

Improvements:
• Improved web search and web fetch reliability by retrying 529 errors and rate-limited requests with bounded backoff
• Improved prompt caching: the mid-conversation system block now works behind LLM gateways and custom base URLs (Bedrock, Vertex, 1P)
• Improved background agent attach: cold-attaching now instantly shows the formatted transcript while the session boots, instead of a blank wait

Removal:
• Deprecated the Task tool's mode parameter (now ignored); subagents inherit the parent session's permission mode by default

Security/safety changes:
• Changed agent view / claude agents --json: sessions waiting on a sandbox, MCP-input, or managed-settings prompt now show as "Needs input" instead of "Working"
• Updated the auth status panel title from "Cloud authentication" to "Authentication"

Other changes:
• /fork now copies your conversation into a new background session (its own row in claude agents) while you keep working; the in-session subagent it used to launch is now /subtask
• MCP tool calls running longer than 2 minutes now move to the background automatically so the session stays usable; configure the threshold or disable with CLAUDE_CODE_MCP_AUTO_BACKGROUND_MS
• Typing /resume in the agent view now opens a picker of past sessions — including sessions deleted from the list — and resumes your pick as a background session
• Reduced token usage in inter-agent messaging: SendMessage bodies are no longer duplicated into replayed history and tool results
• Changed /fork to name the copy after your prompt when the session has no title, so the row is recognizable in the agent view
• Changed bare /btw to reopen the side-question panel on your most recent exchange so you can browse earlier answers
• Changed the ← footer hint to pulse N done for a moment when a background agent finishes while nothing needs your input
• Changed Enterprise forceLoginMethod to be enforced for VS Code extension, SDK, setup-token, and install-github-app logins, not just the terminal
• Changed session transcripts to record the reasoning effort level on each assistant message
• Changed headless/SDK sessions to apply a set_model control request mid-turn; the next model round-trip uses the new model instead of waiting for the next turn

Source: https://t.co/hkLGF9Z0Jw