Released Jul 13, 2026. Everything the community has pinned to this exact release.
Every session that touches a dependency ends with a 3,000-line package-lock.json diff, even when I asked for a one-line version bump. Turns out it runs `npm install` instead of `npm ci` and regenerates the lockfile against its own npm version.
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.
We let an agent do first-pass triage on pages for a quarter: real numbers on time-to-context, the two incidents it made worse, and where the human stays load-bearing.
Compaction ate my constraint again. Practices for deciding what stays in context, what gets externalized to files, and when to declare session bankruptcy.
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.
stdio MCP servers drop after long idle gaps: first call after ~10 minutes of Bash-heavy work fails with 'MCP error -32000: Connection closed', then every subsequent call fails until you restart the session. Traced to servers exiting on stdin EOF-ish idle and the client not restarting them.
Claude Code can't see Xcode's build errors unless you hand them over. XcodeBuild MCP plus a formatter that strips the noise gives the agent a real edit-build-test loop for SwiftUI work — the difference between guessing and iterating.
Spin up an agent in a git worktree for isolation and it happily reads ../main-checkout/.env when its own worktree doesn't have one — dotenv walks up the directory tree, finds the parent repo's env, and your 'isolated' experiment runs with production-ish credentials.
Five days, two agents, one working Stripe billing portal: what was delegated, what broke, what it cost ($61.40 all-in), and the day everything went sideways.
Put the laptop to sleep with IntelliJ open, wake it, and the Claude Code tool window is a zombie: input accepted, nothing sent, diffs no longer mirrored in the editor. The CLI process underneath is fine — it's the plugin's websocket that died and never reconnects.
Agent converts @StateObject to @State (or reorders wrapped properties) as part of an 'observability migration' and every preview in the file dies with 'Compiling failed: cannot preview in this file' or a XCPreviewAgent crash. Builds fine, runs fine on device — only previews break.
Reproduction evidence on 2.4.0
| Problem | Version | OS | Outcome | Status |
|---|---|---|---|---|
| Agent ran terraform apply from a stale plan | 2.4.0 | Ubuntu 24.04 | Reproduced | Active Issue |
| Claude Code 2.4.1 changed hook execution order — parallel matchers now run concurrently | 2.4.0 | macOS 15.5 | Not reproduced | Active Issue |
| Worktree sessions inherit .env from the main checkout | 2.4.0 | macOS 15.5 | Reproduced | Active Issue |
| MCP server memory leak in long sessions | 2.4.0 | macOS 15.5 | Reproduced |
| Active Issue |
| Claude Code keeps rewriting package-lock.json | 2.4.0 | macOS 15.5 | Reproduced | Workaround Verified |
| Claude Code ignores repository instructions after compaction | 2.4.0 | macOS 15.5 | Reproduced | Active Issue |
| Agents sprinkle 'use client' and break server component boundaries | 2.4.0 | macOS 15.5 | Reproduced | Workaround Verified |
| JetBrains plugin loses connection after IDE sleeps | 2.4.0 | macOS 15.5 | Reproduced | Workaround Verified |
| MCP server keeps disconnecting mid-session | 2.4.0 | macOS 15.5 | Reproduced | Workaround Verified |
| Codex exceeds requested scope on small edits | 2.4.0 | macOS 15.5 | Not reproduced | Active Issue |
| PreToolUse hooks never fire under PowerShell profiles on Windows | 2.4.0 | Windows 11 | Fixed in version | Fixed |
| SwiftUI previews crash after agent edits property wrappers | 2.4.0 | macOS 15.5 | Reproduced | Workaround Verified |