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  <title>Rulefiles digest</title>
  <subtitle>What changed in AI coding tools, and which instruction file each agent reads.</subtitle>
  <id>https://rulefiles.dev/digest/feed.xml</id>
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  <updated>2026-10-16T00:00:00Z</updated>
  <author><name>Rulefiles</name></author>
  <entry>
    <title>Digest for 12 to 18 October 2026 (through 15 October)</title>
    <id>tag:rulefiles.dev,2026:digest/2026-W42</id>
    <link rel="alternate" type="text/html" href="https://rulefiles.dev/digest/2026-W42/"/>
    <published>2026-10-16T00:00:00Z</published>
    <updated>2026-10-16T00:00:00Z</updated>
    <author><name>Rulefiles</name></author>
    <summary>The week is still running: this issue lists changes published up to 15 October 2026. Each item quotes the source wording and links to it. No new Cursor changelog entry since 2026-10-13, as of 2026-10-16.</summary>
    <content type="html">&lt;ul&gt;&lt;li&gt;2026-10-13 Cursor: Origin App Marketplace. Origin now integrates with over 20 apps for deployments, CI, code review, security, monitoring, and project management, from partners including Cloudflare, Linear, Sentry, and Socket Security. &lt;a href=&quot;https://cursor.com/changelog/origin-app-marketplace&quot;&gt;Cursor changelog&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-14 Claude Code: Claude Code v2.1.299. Added &lt;code&gt;CLAUDE_CODE_DISABLE_FILE_MENTIONS&lt;/code&gt; environment variable: Claude gets the paths of &lt;code&gt;@&lt;/code&gt; file mentions to read with its file tools, not the files&amp;#39; contents &lt;a href=&quot;https://github.com/anthropics/claude-code/releases/tag/v2.1.299&quot;&gt;Claude Code release notes&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-14 Claude Code: Claude Code v2.1.300. Added &lt;code&gt;cache_creation_5m_tokens&lt;/code&gt; and &lt;code&gt;cache_creation_1h_tokens&lt;/code&gt; to the OpenTelemetry &lt;code&gt;api_request&lt;/code&gt; event, splitting cache writes by lifetime &lt;a href=&quot;https://github.com/anthropics/claude-code/releases/tag/v2.1.300&quot;&gt;Anthropic, Claude Code release notes&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-15 Claude Code: Claude Code v2.1.301. Added the &lt;code&gt;%&lt;/code&gt; motion to vim mode: jump to the matching bracket, alone or with d/c/y &lt;a href=&quot;https://github.com/anthropics/claude-code/releases/tag/v2.1.301&quot;&gt;Claude Code release notes&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-14 Codex: GPT-5.5 retirement in Codex. Effective October 14, 2026, at noon PDT (19:00 UTC), GPT-5.5 retires from Codex for users signed in with ChatGPT. &lt;a href=&quot;https://learn.chatgpt.com/docs/changelog#codex-2026-10-14-gpt-55-retirement&quot;&gt;OpenAI, Codex changelog&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-15 Codex: Codex 0.163.0. Open &lt;code&gt;/config&lt;/code&gt; to search preferences across categories, change supported settings immediately, and see which changes require a restart. &lt;a href=&quot;https://github.com/openai/codex/releases/tag/rust-v0.163.0&quot;&gt;Codex release notes&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-13 GitHub Copilot: Gemini 4 Argon in GitHub Copilot. Gemini 4 Argon, Google’s newest frontier model, is now generally available in GitHub Copilot. &lt;a href=&quot;https://github.blog/changelog/2026-10-13-gemini-4-argon-in-github-copilot&quot;&gt;GitHub changelog&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-13 GitHub Copilot: Enterprise managed settings enforcement updates. Enterprise administrators can now require supported GitHub Copilot clients to retrieve current server-managed settings at startup instead of relying on a cached policy. &lt;a href=&quot;https://github.blog/changelog/2026-10-13-enterprise-managed-settings-enforcement-updates/&quot;&gt;GitHub changelog&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-15 GitHub Copilot: Upcoming deprecation of selected GitHub Copilot models in mid-November. We will deprecate the following models across all GitHub Copilot experiences (including Copilot Chat, inline edits, ask and agent modes, and code completions) on November 16th, 2026 &lt;a href=&quot;https://github.blog/changelog/2026-10-15-upcoming-deprecation-of-selected-github-copilot-models-in-mid-november&quot;&gt;GitHub changelog&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-15 GitHub Copilot: Agentic autofix for code scanning alerts general availability. Agentic autofix is available to GitHub Code Security and GitHub Advanced Security customers on GitHub Enterprise Cloud, including GitHub Enterprise Cloud with data residency. &lt;a href=&quot;https://github.blog/changelog/2026-10-15-agentic-autofix-for-code-scanning-alerts-general-availability/&quot;&gt;GitHub changelog&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</content>
  </entry>
  <entry>
    <title>Digest for 5 to 11 October 2026</title>
    <id>tag:rulefiles.dev,2026:digest/2026-W41</id>
    <link rel="alternate" type="text/html" href="https://rulefiles.dev/digest/2026-W41/"/>
    <published>2026-10-16T00:00:00Z</published>
    <updated>2026-10-16T00:00:00Z</updated>
    <author><name>Rulefiles</name></author>
    <summary>Selected changes from the Cursor changelog, Claude Code and Codex release notes, and the GitHub changelog. Each item quotes the source wording and links to it.</summary>
    <content type="html">&lt;ul&gt;&lt;li&gt;2026-10-06 Cursor: Remote control for local agents. You can now see and reply to the local agents running on your computer from the Cursor iOS app. &lt;a href=&quot;https://cursor.com/changelog/remote-control-local-agents&quot;&gt;Cursor changelog&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-06 Claude Code: Claude Code v2.1.292. Added an &lt;code&gt;effort&lt;/code&gt; parameter to the Agent tool, so Claude runs a sub-agent at the effort level you ask for &lt;a href=&quot;https://github.com/anthropics/claude-code/releases/tag/v2.1.292&quot;&gt;Claude Code release notes&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-07 Claude Code: Claude Code v2.1.293. Added Claude Haiku 5.5 (&lt;code&gt;claude-haiku-5-5&lt;/code&gt;), now the default Haiku model on the Anthropic API — 1M context, $0.10/$0.50 per Mtok ($0.50/$2.50 for prompts over 100K) &lt;a href=&quot;https://github.com/anthropics/claude-code/releases/tag/v2.1.293&quot;&gt;Claude Code release notes&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-08 Claude Code: Claude Code v2.1.294. Fixed &lt;code&gt;prompt&lt;/code&gt; and &lt;code&gt;agent&lt;/code&gt; hooks written as instructions (such as &amp;quot;Block commands that...&amp;quot;) allowing what they should block &lt;a href=&quot;https://github.com/anthropics/claude-code/releases/tag/v2.1.294&quot;&gt;Anthropic, Claude Code release notes&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-08 Claude Code: Claude Code v2.1.295. Added &lt;code&gt;onFailure: &amp;quot;block&amp;quot;&lt;/code&gt; for command and HTTP hooks: a hook that can&amp;#39;t start, times out, or exits with an unexpected code blocks the action instead of letting it through &lt;a href=&quot;https://github.com/anthropics/claude-code/releases/tag/v2.1.295&quot;&gt;Claude Code release notes&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-09 Claude Code: Claude Code v2.1.296. Added an &lt;code&gt;allow_large&lt;/code&gt; option to the Read tool so Claude can read a text file past the usual size limits in one call when it needs the whole file and the context has room &lt;a href=&quot;https://github.com/anthropics/claude-code/releases/tag/v2.1.296&quot;&gt;Claude Code release notes&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-07 Codex: Codex 0.161.0. GPT-6.1 Sol is now the default model in the bundled and Amazon Bedrock catalogs. &lt;a href=&quot;https://github.com/openai/codex/releases/tag/rust-v0.161.0&quot;&gt;Codex release notes&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-08 Codex: Codex 0.162.0. Add tools for creating and listing managed Git worktrees from trusted local projects when the worktrees feature is enabled. &lt;a href=&quot;https://github.com/openai/codex/releases/tag/rust-v0.162.0&quot;&gt;Codex release notes&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-08 Codex: GPT-6.1 Sol Ultrafast in Codex and ChatGPT Work. Ultrafast mode speeds up token generation with GPT-6.1 Sol in Codex and ChatGPT Work. Ultrafast is available on Pro $500 and eligible Enterprise and Edu plans. &lt;a href=&quot;https://learn.chatgpt.com/docs/changelog#codex-2026-10-08-gpt-61-sol-ultrafast&quot;&gt;OpenAI, Codex changelog&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-09 Codex: Codex 0.162.1. Fixed a TUI crash when asynchronous questions contain multiple lines, preserving line breaks and complete hyperlink destinations. &lt;a href=&quot;https://github.com/openai/codex/releases/tag/rust-v0.162.1&quot;&gt;Codex release notes&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-07 GitHub Copilot: Claude Haiku 5.5 in GitHub Copilot. Claude Haiku 5.5, Anthropic’s newest lightweight model, is now generally available in GitHub Copilot. &lt;a href=&quot;https://github.blog/changelog/2026-10-07-claude-haiku-5-5-in-github-copilot&quot;&gt;GitHub changelog&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-08 GitHub Copilot: Copilot code review: New organization billing options and controls. This release adds new billing and license controls for Copilot code review admins &lt;a href=&quot;https://github.blog/changelog/2026-10-08-copilot-code-review-new-organization-billing-options-and-controls&quot;&gt;GitHub changelog&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-09 GitHub Copilot: GitHub Copilot weekly releases: October 5. Limit agents’ access to files, networks, and credentials with local sandboxing, now generally available in Copilot CLI, the Copilot app, and VS Code sessions using Agent Host. &lt;a href=&quot;https://github.blog/changelog/2026-10-09-github-copilot-weekly-releases-october-5/&quot;&gt;GitHub changelog&lt;/a&gt;&lt;/li&gt;&lt;li&gt;2026-10-10 GitHub Copilot: New controls and chat improvements in Copilot for JetBrains. This update brings more control over default models and MCP server in GitHub Copilot for JetBrains. &lt;a href=&quot;https://github.blog/changelog/2026-10-10-new-controls-and-chat-improvements-in-copilot-for-jetbrains&quot;&gt;GitHub changelog&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</content>
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