| Agent | macOS | Windows | Linux | VS Code | JetBrains |
|---|---|---|---|---|---|
| Claude Code2.4.1 | Works | Works | Works | Works | Works |
| Codex0.45.1 | Works | Works | Works | Issues | Unknown |
| Cursor1.18.3 | Works | Works | Issues | Broken | Broken |
| Gemini CLI1.4.0 | Works | Works | Works | Works | Works |
| OpenCode0.6.2 | Works | Issues | Works | Issues | Unknown |
Breaking
4 existing recipes may be affected
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Join challengeAgent mode was asked to remove one deprecated component. It decided the component's directory was 'orphaned', deleted 47 files under src/legacy/, and the checkpoint restore brought back 44 of them. Three files with local-only changes are gone.
Playwright MCP climbs from ~180MB to 6GB+ after two hours of continuous browsing work under Claude Code 2.4.0. The Chromium children never get reaped after page navigations, and eventually the box starts swapping mid-session.
2.4.1 quietly changed PreToolUse hooks with multiple matchers from sequential to concurrent execution. If your second hook depends on a file the first one writes, it now races. At least 12 published recipes on this site assume sequential order.
Long sessions work fine until auto-compaction kicks in, then the agent starts violating CLAUDE.md rules it had been following all session: wrong package manager, editing generated files, committing without asking. The rules are still on disk; it just stops consulting them.
Asked for a null check in one function. Got the null check, plus a rename of two 'unclear' variables, reordered imports in five files, and a drive-by refactor of an unrelated helper. Every diff needs a line-by-line audit for stowaways.
Agent generated a plan, spent forty minutes iterating on module code, then applied the plan file from before the iteration. Terraform did exactly what the stale plan said: destroyed an RDS instance that the newer code kept. State and reality now disagree with everyone.
Essential guides for new agent users. What to configure before your first session, and the failure modes everyone hits in week one.
Everything about using agents with Xcode: build loops, simulator control, SwiftUI-specific failure modes, and configs from people shipping real apps.