Claude Report — 2026-04-21

🚀 Anthropic Official

Claude Haiku 3 retired from the API

Retires claude-3-haiku-20240307 on Apr 20; all API requests to this model now return an error. Migration target is Claude Haiku 4.5, which costs approximately 4× more per token than Haiku 3.

Claude Code v2.1.116

Ships Apr 20 with meaningful improvements across performance, security, and MCP: /resume up to 67% faster on sessions ≥40 MB; MCP servers can override result truncation via _meta["anthropic/maxResultSizeChars"] (ceiling: 500 K chars), enabling full DB schemas and large payloads to pass through; new disableSkillShellExecution setting prevents inline shell execution inside skills and plugin commands; sandbox auto-allow no longer bypasses the dangerous-path safety check for rm/rmdir targeting /, $HOME, or critical system dirs; resources/templates/list deferred until first @-mention speeds up multi-server MCP startup; Write tool diff is 60% faster on large files; thinking spinner now shows inline progress strings ("still thinking", "thinking more", "almost done thinking"); /skills menu supports sorting by estimated token count; /reload-plugins and background auto-update now auto-install missing plugin dependencies.

Claude Code v2.1.114

Bug-fix release on Apr 19: resolves a crash in the permission dialog triggered when an agent-teams teammate requested tool permission.

🔌 Claude Code Plugins

liquid-skills — new plugin

Adds three Shopify Liquid theme-development skills (Liquid language fundamentals, CSS/JS/HTML coding standards, WCAG accessibility patterns) sourced from Shopify/liquid-skills. Merged Apr 20.

amplitude — source fix

Corrects the plugin's git-subdir source to point at plugins/amplitude, resolving an incorrect path reference that prevented proper updates. Merged Apr 20.

Unchanged in window: frontend-design, superpowers, context7, code-review, code-simplifier, github, playwright, feature-dev, skill-creator, claude-md-management.

🛠️ Skills

No relevant news today.

Unchanged in window: superpowers:brainstorming, superpowers:tdd, superpowers:systematic-debugging, superpowers:writing-plans, superpowers:executing-plans.

🤖 Agents & Subagents

No relevant news today.

Unchanged in window: superpowers:subagent-driven-development, claude-router:orchestrate, ralph-loop, claude-router:fast-executor, claude-mem:do.

🔗 MCPs & Integrations

claude-mem v12.3.3–v12.3.8

Six releases across ~8 hours on Apr 20–21: "Issue Blowout 2026" (v12.3.3) landed 25 bug fixes covering security hardening, worker stability, search, hooks, and database performance but introduced bearer-token auth that broke SessionStart context injection; v12.3.4 rolled it back entirely; v12.3.5 re-applied the 25 fixes without the auth regression; v12.3.6 removed a rate limiter that was blocking the live viewer within seconds of startup; v12.3.7 replaced bearer auth with a lightweight 300 req/min rate limiter and removed the unused platform_source filter; v12.3.8 (Apr 21) fixed PID reuse detection in Docker container restarts by capturing a process-start identity token alongside the PID.

Unchanged in window: modelcontextprotocol/servers (last commits Apr 17), context7, github-mcp-server, filesystem MCP.

💡 Community — Workflows & Ideas

claude-desktop-debian

Build scripts by aaddrick that repackage the official Claude Windows desktop app for Debian-based Linux distributions (Ubuntu, Mint, etc.), filling the gap until Anthropic ships a native Linux client. Trended on GitHub Apr 20.

📰 Quick Mentions

• Barracuda: Claude Mythos security implications — Apr 20 editorial on how Mythos accelerates vulnerability discovery at scale and what orgs should prioritize now.
• Claude.ai file upload outage Apr 20 — Anthropic logged "Elevated errors for uploading files" incident on the same day as the Haiku 3 retirement.