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Tools2026-08-12 · source-backed
The Write tool changed in 2.1.228 to match Edit's rules; older models still require a prior Read (Claude Code Changelog). The read-before-write guard was a cheap net against blind clobbering and it's now model-dependent rather than universal. Go re-check any hook or permission rule that assumed a Read always precedes a Write, because that assumption silently stopped being true.
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It now dedupes local CLAUDE.md files against checked-in ones, proposes trimming content it can derive from the codebase, ranks unused skills, MCP servers, and plugins by context cost, and flags slow hooks. Background subagents run by default and, when launched from claude agen...
One Claude Code release fixed two independent permission-check bypasses on the same day. That's the story. Version 2.1.221, shipped August 4, patches a Bash tool bypass where zsh could execute hidden commands embedded inside [[ ]] regex conditionals. The approval prompt never...
It scans prompts and tool descriptions for patterns written for older model generations. This targets a real invisible tax: system prompts and MCP tool descriptions accumulate verbose few-shot blocks, defensive formatting instructions, and reasoning nudges that earned their ke...
Two researchers in my set surfaced this independently, which is usually a sign it matters. Claude Code 2.1.166, first seen June 6, introduces a fallback-models setting: configure up to three models tried in order when the primary is overloaded or unavailable. It also adds glob...
This one rearranged my week. An essay published August 4 walks through Databricks' independent benchmark of coding harnesses against its own multi-million-line codebase. Pi, a harness with four built-in tools and a system prompt under 1,000 tokens, paired with Opus 4.8 at xhig...
One line in the v2.1.215 changelog, July 19: Claude Code no longer invokes the /verify and /code-review skills on its own. You call them explicitly now (changelog). If your workflow assumed a review pass fired at the end of a task, it doesn't anymore, and nothing told you. Cod...
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