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The Claude Code Changelog

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It feels like every day there's a new Claude Code update. This unofficial podcast, hosted by Lachlan and James (& powered by Jellypod AI), helps us stay up to date with everything Anthropic ships to Claude, from product updates, new workflows, and more. Each episode highlights what changed, how to use it, and why it matters.

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  1. Locking Down Subagent Tools and Environment Variables in 2.1.313

    Explore 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 envi

  2. Preventing Premature Runner Shutdowns in Claude Code 2.1.311

    Learn 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 ha

  3. Custom Deployment Prompts and Guardrails in Claude Code 2.1.312

    Learn 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 limits,

  4. Why Ultrathink Now Triggers xHigh Effort in Claude Code 2.1.311

    In 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 Code

  5. Managing Auto Mode Read Permissions in Claude Code 2.1.310

    Discover 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 headless

  6. Claude Code’s Windows Hooks Could Fail Open—Test Yours

    Claude 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 star

  7. Claude Code 2.1.310: Replace Polling with Monitor

    Claude 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 pe

  8. Claude Code 2.1.309: Trust Checks for Ultrareview

    Claude 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

  9. Track Claude Code Guardrails with OpenTelemetry

    Claude 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 violation

  10. Run Chromium and Rootless Podman in Claude Code’s Linux Sandbox

    Claude 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 protect

  11. Teach Claude Code Auto Mode What Your Team Trusts

    Claude 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 set

  12. Claude Code’s /advisor: Opus Guidance Without Opus for Every Task

    How 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, model-pairi

  13. Claude Projects: Delegate Work to Parallel Code Sessions

    Claude Projects is becoming a coordinator for parallel Claude Code cloud sessions: learn how to connect repositories, set project instructions, choose thread models and effort, and manage local-only work. We also cover practical limits and

  14. Claude Code 2.1.302: Pin Auto-Mode Models and Fix CI Defaults

    Claude Code 2.1.302 adds CLAUDE_CODE_AUTO_MODE_MODEL, letting users on proxy, Bedrock, or Vertex setups choose the model used by the client-side auto-mode classifier. The episode also covers a breaking default for headless sessions—explicit

  15. Stop CI Jobs From Waiting Hours on Claude Usage Limits

    Claude Code 2.1.301 adds CLAUDE_CODE_RETRY_WATCHDOG_MAX_USAGE_LIMIT_WAIT_MS, letting CI jobs fail quickly or switch to a fallback model instead of idling through a distant quota reset. Learn how to set it alongside the general retry wait ca

  16. Route Claude Code Workflow Agents by Step

    Claude Code 2.1.300 adds step-aware workflow routing: mods can rewrite an agent’s prompt and choose its model, letting teams balance cost and capability across a workflow. We cover model fallbacks and allowlists, stricter hook validation, p

  17. Taming Terminal Costs with Claude Code Idle Compaction

    Discover how Claude Code 2.1.299 introduces idle compaction to save you tokens and speed up your workflow after stepping away from the terminal. Lachlan and James break down the 54-minute cache window, configuration settings, and handy upda

  18. Optimizing Claude Code Workflow Agents with Subagent Models

    Learn how to control costs and balance performance using the CLAUDE_CODE_WORKFLOW_SUBAGENT_MODEL environment variable introduced in Claude Code 2.1.296. We explore the orchestrator plus swarm pattern, how to configure model overrides withou

  19. Taming Claude Code 529 Errors in CI Pipelines

    Learn how to tame 529 overloaded errors in headless Claude Code runs using the newly released watchdog wait caps and retry delays. We break down the ideal CI environment configurations and highlight important quality-of-life fixes in versio

  20. Unlocking Big Files in Claude Code with allow_large

    We explore how the new allow_large parameter in Claude Code 2.1.296 handles oversized text files in a single pass while surprisingly cutting token costs. Plus, learn how to trigger it automatically and catch up on key fixes to encodings, Po

  21. Taming Subagent Bloat in Claude Code 2.1.296

    Lachlan and James break down Claude Code 2.1.296, exploring how the new autoCompactWindow setting prevents worker subagents from bloating context windows and running up cache read costs. They also cover practical configuration tips, token l

  22. Fixing Broken Guardrails with onFailure Block in Claude Code

    Learn about Claude Code version 2.1.295 and the crucial new onFailure: "block" setting for command and HTTP hooks. We dive into how to prevent broken or missing guard scripts from failing open, plus key caveats to consider before updating y

  23. Unlocking Haiku 5.5 and Effort Levels in Claude Code

    Anthropic launched Claude Haiku 5.5 featuring adjustable effort dials, a 1M token context window, and significantly slashed pricing. Learn how to configure custom subagents in Claude Code to take advantage of these massive cost savings whil

  24. Slashing Subagent Token Costs in Claude Code 2.1.292

    James and Lachlan explore Claude Code 2.1.292, which introduces a dedicated effort parameter for subagents to dramatically slash token costs in multi-agent workflows. They also cover practical orchestration tips, CI-friendly retry configura

  25. Fixing Claude Code Web Limits: Search Refills and WebFetch Pagination

    Lachlan and James break down Claude Code versions 2.1.290 and 2.1.291, highlighting new hourly refills for WebSearch budgets and pagination support for truncated WebFetch pages. They also cover critical regression fixes and expanded permiss

  26. Claude Code Code Review Gets Max Findings Control

    This episode breaks down the new --max findings flag for Claude Code code review, including how to cap, uncape, and reset findings, plus when to use effort levels and review comments or fixes. It also covers important caveats like sticky se

  27. Claude Code 2.1.289: Permission Fixes and Agent Spawn Hooks

    This episode covers Claude Code 2.1.289, highlighting fixes to permission rules, sandbox behavior, symlinked file access, and managed machine safeguards. It also breaks down new agent spawn hooks, improved status tracking, and several stabi

  28. Claude Code 2.1.288 Fixes Rule Loading on New Files

    This episode covers a fix in Claude Code 2.1.288 that makes path-scoped rules and nested CLAUDE.md files load on Write and Edit, even when a file is created before any read. It also breaks down the new InstructionsLoaded hook details, rule-

  29. Claude Code 2.1.287: Mods, Security Risks, and New Guardrails

    We break down the new Claude Mods system in Claude Code 2.1.287, including how in-process TypeScript hooks differ from classic JSON hooks, what the built-in You should know mod does, and why security teams are urging caution. Plus: validati

  30. Claude Code 2.1.286: The verify Skill Before Commit

    This episode explores Claude Code 2.1.286 and its new verify skill, which runs checks before commits so the agent catches its own mistakes. It also covers related polish like clearer permission prompts, safer transcript actions, background

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