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Latest
Claude Code Sandbox Will Not Start on Ubuntu 24.04: Checking and Fixing the AppArmor Block on bubblewrap User Namespaces  ·  Which Claude Code Effort Setting Wins: Precedence of CLAUDE_CODE_EFFORT_LEVEL, --effort, modelSettings, effortLevel and maxEffortLevel  ·  Watching Claude Code Compaction and Hooks Through OpenTelemetry: Reading the compaction, hook_execution_complete and precompute_reuse Fields  ·  Blind Spots in Bash Permission Rules: deny Misses /bin/rm, bash -c and git -C, and devbox run * Lets Any Inner Command Through  ·  CLAUDE.md Too Long? Use .claude/rules/ and paths So Rules Load Only When Claude Touches Matching Files  ·  Chromium Says No usable sandbox! Inside Claude Code's Sandbox: What --no-sandbox, excludedCommands and allowNestedUserNamespaces Each Give Up
Breaking · news

Claude Code v2.1.310 and v2.1.311: Compaction Retries a Missing Summary, ultrathink Runs at xhigh, DISABLE_COMPACT Becomes a One-Way Switch

Neither version has one big feature; the theme is closing the edges of long and unattended sessions: compaction retries, stale files and the 200K stop behavior.
Adrian Koch · October 27, 2026
Claude Code v2.1.310 (2026-10-23) and v2.1.311 (2026-10-26) carry an unusual number of items about Compaction, effort and permissions. Everything below is from the official changelog, with the version marked on each item; the "what this means" section is my judgment and says so. Compaction v2.1.311: when the model's reply during compaction has no summary in it, Claude Code now usually asks for the summary once more before it replaces the conversation. v2.1.311: fixed Claude seeing stale...
practice
Claude Code Sandbox Will Not Start on Ubuntu 24.04: Checking and Fixing the AppArmor Block on bubblewrap User Namespaces
By default a sandbox that cannot start means commands run without it; if you...
advanced
Which Claude Code Effort Setting Wins: Precedence of CLAUDE_CODE_EFFORT_LEVEL, --effort, modelSettings, effortLevel and maxEffortLevel
Write effortLevel: xhigh in user settings and Opus 5.5 and later models...
advanced
Watching Claude Code Compaction and Hooks Through OpenTelemetry: Reading the compaction, hook_execution_complete and precompute_reuse Fields
Do not use OpenTelemetry only for tokens and cost; whether compaction reused...
Today's News
Blind Spots in Bash Permission Rules: deny Misses /bin/rm, bash -c and git -C, and devbox run * Lets Any Inner Command Through
practice · Oct 23
A Bash deny rule matches command text, not the program;...
CLAUDE.md Too Long? Use .claude/rules/ and paths So Rules Load Only When Claude Touches Matching Files
beginners · Oct 23
Break the YAML in the frontmatter and a path-scoped rule...
Chromium Says No usable sandbox! Inside Claude Code's Sandbox: What --no-sandbox, excludedCommands and allowNestedUserNamespaces Each Give Up
advanced · Oct 23
None of the three fixes for Chromium in the sandbox is...
Claude Code v2.1.309 Fixes a Batch of Sandbox and Permission Gaps: Startup Files Outside the Sandbox, denyWrite Through Symlinks and More
news · Oct 23
A sandbox is only as good as the assumptions you lean...
The auto mode $defaults Trap: Leave One String Out of autoMode.soft_deny and the Built-In Force-Push Rules Disappear
practice · Oct 23
Leave "$defaults" out of an auto mode array and you have...

Glossary

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Adaptive Thinking
A reasoning mode where Claude dynamically decides whether and how deeply to think based on request complexity, replacing the older <a href="/en/glossary/prompt-engineering/extended-thinking/">Extended Thinking</a> mode that required manually setting a fixed token budget.
What is adaptive thinking, and how does it differ from the older <a href="/en/glossary/prompt-engineering/extended-thinking/">Extended...
intermediate
Chain-of-Thought Prompting
Prompting the model to write out intermediate reasoning steps before giving a final answer, rather than jumping straight to the answer, to improve accuracy on complex reasoning tasks.
**What is <a href="https://claude-me.com/en/glossary/prompt-techniques/chain-of-thought/" target="_blank" rel="noopener">Chain-of-Thought...
beginner
Extended Thinking
The internal reasoning Claude performs before replying — the model decides per request whether and how deeply to think, now steered by the effort parameter rather than the legacy hard-capped budget_tokens.
What does <a href="https://claude-me.com/en/glossary/core-concepts/extended-thinking/" target="_blank" rel="noopener">Extended Thinking</a>...
intermediate

Weekly Picks

beginners

CLAUDE.md Too Long? Use .claude/rules/ and paths So Rules Load Only When Claude Touches Matching Files

Break the YAML in the frontmatter and a path-scoped rule does not error; it quietly becomes one...
Leo Marchetti
advanced

Chromium Says No usable sandbox! Inside Claude Code's Sandbox: What --no-sandbox, excludedCommands and allowNestedUserNamespaces Each Give Up

None of the three fixes for Chromium in the sandbox is free; they differ only in whether you...
Sienna Park
news

Claude Code v2.1.309 Fixes a Batch of Sandbox and Permission Gaps: Startup Files Outside the Sandbox, denyWrite Through Symlinks and More

A sandbox is only as good as the assumptions you lean on, and v2.1.309 fixes exactly those:...
Grace Lindqvist
practice

The auto mode $defaults Trap: Leave One String Out of autoMode.soft_deny and the Built-In Force-Push Rules Disappear

Leave "$defaults" out of an auto mode array and you have not added a rule, you have replaced the...
Grace Lindqvist