The Claude Code Changelog
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Latest episodes
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Locking Down Subagent Tools and Environment Variables in 2.1.313
October 30, 2026 · 5 minExplore the updates in Claude Code version 2.1.313, focusing on subagent tool restrictions through explicit allow and disallow lists to limit blast radius and save tokens. Learn how the new environment variable allowlist secures worker…
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Preventing Premature Runner Shutdowns in Claude Code 2.1.311
October 29, 2026 · 5 minLearn how Claude Code 2.1.311's new self-hosted runner idle-hold flags prevent background processes and dev servers from being terminated prematurely. We explore how to configure these settings, avoid common timing misconfigurations, and…
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Custom Deployment Prompts and Guardrails in Claude Code 2.1.312
October 28, 2026 · 5 minLearn about changes in Claude Code 2.1.312 that alter default system prompts and refusal fallback behaviors for custom model deployment names on Bedrock, Vertex, Foundry, and Mantle. We also cover crucial updates to hook concurrency…
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Why Ultrathink Now Triggers xHigh Effort in Claude Code 2.1.311
October 27, 2026 · 5 minIn Claude Code 2.1.311, the ultrathink prompt keyword now actively raises the API effort parameter to xhigh for interactive terminal sessions. We also cover how compaction handles requests over 200K tokens, new telemetry behavior in VS…
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Managing Auto Mode Read Permissions in Claude Code 2.1.310
October 26, 2026 · 4 minDiscover how a prompt update in Claude Code 2.1.310 clarifies the impact of denying reads outside your working directory during auto mode, plus how to manage trusted paths with settings and the add dir flag. Also covered: fixes for…
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Claude Code’s Windows Hooks Could Fail Open—Test Yours
October 25, 2026 · 5 minClaude Code 2.1.309 and 2.1.310 tighten sandbox and permission boundaries, including fixes for Windows hooks that could fail open. Learn how to check your version, test a blocking hook and an Edit deny rule, and diagnose Ubuntu sandbox…
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Claude Code 2.1.310: Replace Polling with Monitor
October 24, 2026 · 6 minClaude Code 2.1.310 enables the Monitor tool on Amazon Bedrock, Google Vertex, and Microsoft Foundry—even with telemetry or nonessential traffic disabled. Learn how to replace sleep-and-check loops with event-driven monitoring, configure…
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Claude Code 2.1.309: Trust Checks for Ultrareview
October 23, 2026 · 5 minClaude Code 2.1.309 adds a workspace-trust check to claude ultrareview. Learn how to handle the prompt, update scripts and CI with the correctly ordered --trust-workspace flag or the environment variable, and weigh the security and billing…
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Track Claude Code Guardrails with OpenTelemetry
October 22, 2026 · 5 minClaude Code 2.1.307 adds the claude_code.safety_event OpenTelemetry event, letting teams track when permissions, safety checks, hooks, or the sandbox stop, prompt, or send back a tool call. Learn how to query the event for sandbox…
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Run Chromium and Rootless Podman in Claude Code’s Linux Sandbox
October 21, 2026 · 6 minClaude Code 2.1.305 adds sandbox.allowNestedUserNamespaces for Linux and WSL2, enabling tools such as headless Chromium and rootless Podman to run inside the Bash sandbox. Learn how to enable it and why it weakens the sandbox’s file…
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Teach Claude Code Auto Mode What Your Team Trusts
October 20, 2026 · 5 minClaude Code 2.1.304 expands /auto-mode-setup to more provider and gateway sessions, helping you draft trusted environment rules from project files and recent activity. Learn what the setup scans, how to review and verify its all-at-once…
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Claude Code’s /advisor: Opus Guidance Without Opus for Every Task
October 19, 2026 · 6 minHow Claude Code’s experimental /advisor pairs a lower-cost executor with a stronger model that can review the full session and offer guidance. Learn how to enable it, prompt for consultations, inspect advice, and check provider…

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