Three regressions confirmed: reasoning effort, context retention, and verbosity changes

Anthropic publishes post-mortem on Claude Code quality issues

Release of a comprehensive cheat sheet for Claude Code aggregating CLI commands, MCP configurations, and workflow shortcuts.

Released Playwright MCP Server for generating web tests from natural language prompts

Announced 46:1 context cache ratio for managing 39 projects and integration with FastMCP

Critical security vulnerabilities (CVE-2026-35022) disclosed, requiring immediate patching and cessation of authentication helper use.

Launched new layered customization system informed by the study, using repo-level, path-specific, and custom agent files

Announced Copilot SDK shifting AI from chat to programmable execution layer.

Made custom agents, sub-agents, plan agent, and auto model selection generally available in JetBrains IDEs.

Ranked seventh in AI coding assistant benchmark with 22.6% F1 score