The Claude Code Changelog

Jellypod, Inc.

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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#173
Friday · 4 min
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 environments in hea
- Transcript
#172
Thursday · 4 min
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 handle teardown c
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#171
Wednesday · 4 min
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, subagent compa
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#170
Tuesday · 5 min
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, and MCP tool
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#169
Monday · 3 min
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 MCP timeouts,
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#168
October 25 · 4 min
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 startup issues with
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#167
October 24 · 5 min
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 permissions, and
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#166
October 23 · 4 min
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 caveats. We als
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#165
October 22 · 5 min
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 violations and recurring
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#164
October 21 · 5 min
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 protections. The hosts
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#163
October 20 · 5 min
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 settings changes,
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#162
October 19 · 5 min
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-pairing, and cost ca
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#161
October 18 · 5 min
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 cost traps, inc
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#160
October 17 · 4 min
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—explicitly set --permis
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#159
October 16 · 4 min
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 cap, where to sco
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#158
October 15 · 4 min
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, practical safegu
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#157
October 14 · 4 min
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 updates to hooks an
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#156
October 13 · 5 min
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 without breaking inte
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#155
October 12 · 5 min
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 versions 2.1.295 and
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#154
October 11 · 4 min
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, PowerShell limits
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