docs: Claude Code v2.1.258 - macOS Monterey fix, claude-mythos-5-1 in API, 3 new beta headers, new sandbox-runtime repo

content/CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## 2.1.258
+
+- Fixed Claude Code failing to launch on macOS 12 (Monterey), a regression introduced in 2.1.255
+- Fixed remote and scheduled sessions failing with "user messages must have non-empty content" after a re-sent permission approval could not be applied
+
 ## 2.1.257
 
 - Added Claude Fable 5.1 (`claude-fable-5-1`), now the default Fable model — 1M context, $10/$50 per Mtok with $0.25/Mtok cache reads

content/claude-code-manifest.json

@@ -6,25 +6,25 @@
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   "author": {
     "name": "Anthropic",
     "email": "support@anthropic.com"
@@ -42,8 +42,8 @@
     "email": "wolffiex@anthropic.com"
   },
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   "description": "Use Claude, Anthropic's AI assistant, right from your terminal. Claude can understand your codebase, edit files, run terminal commands, and handle entire workflows for you.",
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@@ -106,19 +106,19 @@
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content/claude/cowork/changelog.md

@@ -6,6 +6,24 @@
 
 > Release notes for Claude Desktop
 
+<Update label="v1.40609.1" description="2026-08-30">
+  **General**
+
+  * Updated the bundled Claude Code CLI to version 2.1.255.
+
+  **Code**
+
+  * No user-facing changes.
+
+  **Cowork**
+
+  * No user-facing changes.
+
+  **3P**
+
+  * No user-facing changes.
+</Update>
+
 <Update label="v1.40609.0" description="2026-08-27">
   **General**
 

content/claude/third-party/claude-desktop/configuration-changelog.md

@@ -8,6 +8,10 @@
 
 Configuration keys by Claude Desktop release. Each section lists keys added in that release, with the MDM key name (for plist/registry deployment) and the equivalent JSON shape (for local-file or bootstrap remote configuration).
 
+<Update label="v1.40609.1" description="2026-08-30">
+  No configuration changes in this release.
+</Update>
+
 <Update label="v1.40609.0" description="2026-08-27">
   <div className="cfg-keys">
     | MDM key                                                                                                          | Type       | Description                             |