diff --git a/CHANGELOG.md b/CHANGELOG.md
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@@ -1,5 +1,48 @@
 # Changelog
 
+## 2.1.84
+
+- Added PowerShell tool for Windows as an opt-in preview. Learn more at https://code.claude.com/docs/en/tools-reference#powershell-tool
+- Added `ANTHROPIC_DEFAULT_{OPUS,SONNET,HAIKU}_MODEL_SUPPORTS` env vars to override effort/thinking capability detection for pinned default models for 3p (Bedrock, Vertex, Foundry), and `_MODEL_NAME`/`_DESCRIPTION` to customize the `/model` picker label
+- Added `CLAUDE_STREAM_IDLE_TIMEOUT_MS` env var to configure the streaming idle watchdog threshold (default 90s)
+- Added `TaskCreated` hook that fires when a task is created via `TaskCreate`
+- Added `WorktreeCreate` hook support for `type: "http"` — return the created worktree path via `hookSpecificOutput.worktreePath` in the response JSON
+- Added `allowedChannelPlugins` managed setting for team/enterprise admins to define a channel plugin allowlist
+- Added `x-client-request-id` header to API requests for debugging timeouts
+- Added idle-return prompt that nudges users returning after 75+ minutes to `/clear`, reducing unnecessary token re-caching on stale sessions
+- Deep links (`claude-cli://`) now open in your preferred terminal instead of whichever terminal happens to be first in the detection list
+- Rules and skills `paths:` frontmatter now accepts a YAML list of globs
+- MCP tool descriptions and server instructions are now capped at 2KB to prevent OpenAPI-generated servers from bloating context
+- MCP servers configured both locally and via claude.ai connectors are now deduplicated — the local config wins
+- Background bash tasks that appear stuck on an interactive prompt now surface a notification after ~45 seconds
+- Token counts ≥1M now display as "1.5m" instead of "1512.6k"
+- Global system-prompt caching now works when `ToolSearch` is enabled, including for users with MCP tools configured
+- Fixed voice push-to-talk: holding the voice key no longer leaks characters into the text input, and transcripts now insert at the correct position
+- Fixed up/down arrow keys being unresponsive when a footer item is focused
+- Fixed `Ctrl+U` (kill-to-line-start) being a no-op at line boundaries in multiline input, so repeated `Ctrl+U` now clears across lines
+- Fixed null-unbinding a default chord binding (e.g. `"ctrl+x ctrl+k": null`) still entering chord-wait mode instead of freeing the prefix key
+- Fixed mouse events inserting literal "mouse" text into transcript search input
+- Fixed workflow subagents failing with API 400 when the outer session uses `--json-schema` and the subagent also specifies a schema
+- Fixed missing background color behind certain emoji in user message bubbles on some terminals
+- Fixed the "allow Claude to edit its own settings for this session" permission option not sticking for users with `Edit(.claude)` allow rules
+- Fixed a hang when generating attachment snippets for large edited files
+- Fixed MCP tool/resource cache leak on server reconnect
+- Fixed a startup performance issue where partial clone repositories (Scalar/GVFS) triggered mass blob downloads
+- Fixed native terminal cursor not tracking the text input caret, so IME composition (CJK input) now renders inline and screen readers can follow the input position
+- Fixed spurious "Not logged in" errors on macOS caused by transient keychain read failures
+- Fixed cold-start race where core tools could be deferred without their bypass active, causing Edit/Write to fail with InputValidationError on typed parameters
+- Improved detection for dangerous removals of Windows drive roots (`C:\`, `C:\Windows`, etc.)
+- Improved interactive startup by ~30ms by running `setup()` in parallel with slash command and agent loading
+- Improved startup for `claude "prompt"` with MCP servers — the REPL now renders immediately instead of blocking until all servers connect
+- Improved Remote Control to show a specific reason when blocked instead of a generic "not yet enabled" message
+- Improved p90 prompt cache rate
+- Reduced scroll-to-top resets in long sessions by making the message window immune to compaction and grouping changes
+- Reduced terminal flickering when animated tool progress scrolls above the viewport
+- Changed issue/PR references to only become clickable links when written as `owner/repo#123` — bare `#123` is no longer auto-linked
+- Slash commands unavailable for the current auth setup (`/voice`, `/mobile`, `/chrome`, `/upgrade`, etc.) are now hidden instead of shown
+- [VSCode] Added rate limit warning banner with usage percentage and reset time
+- Stats screenshot (Ctrl+S in /stats) now works in all builds and is 16× faster
+
 ## 2.1.83
 
 - Added `managed-settings.d/` drop-in directory alongside `managed-settings.json`, letting separate teams deploy independent policy fragments that merge alphabetically