https://dan.dezmirean.ro/mastery/ Daily newsletter making you the best Claude Code operator there is. en https://dan.dezmirean.ro/assets/mastery-og.png https://dan.dezmirean.ro/mastery/ https://dan.dezmirean.ro/mastery/2026-04-11-weekend.html https://dan.dezmirean.ro/mastery/2026-04-11-weekend.html Sat, 11 Apr 2026 12:00:00 -0000 v2.1.101 — The Biggest Bug-Fix Release Yet · The Monitor Tool — From Polling Loops to Event-Driven Agents · The Advisor Strategy — Opus as On-Demand Strategist · Four Runtime Patterns from Claude Code's Source · AgentLint — 68 Hook Rules, Zero LLM Calls · Twill.ai — Cloud Agents That Deliver Pull Requests · Build an Advisor-Powered Code Review Pipeline https://dan.dezmirean.ro/mastery/2026-04-10.html https://dan.dezmirean.ro/mastery/2026-04-10.html Fri, 10 Apr 2026 12:00:00 -0000 v2.1.98 Patched Six Bash Permission Bypasses · Subprocess Sandboxing: PID Isolation and Script Caps · Plugin Trust After the Vercel Telemetry Scandal · Engram: Zero-Dep Persistent Memory in a Single Go Binary · Audit Your Installed Plugins for Telemetry Leaks https://dan.dezmirean.ro/mastery/2026-04-09.html https://dan.dezmirean.ro/mastery/2026-04-09.html Thu, 09 Apr 2026 12:00:00 -0000 Focus View — The Three-State Terminal Navigator · v2.1.97 Fixed Four Agent-Killing Bugs · Design for Resumability — Lessons from 7 Resume Fixes · claude-on-a-leash: Deterministic Security Without Sandbox Overhead · Master the Three-State Navigator in 10 Minutes https://dan.dezmirean.ro/mastery/2026-04-08.html https://dan.dezmirean.ro/mastery/2026-04-08.html Wed, 08 Apr 2026 12:00:00 -0000 Auto-Name Sessions with hookSpecificOutput.sessionTitle · Sandbox Your Agents: Runtime Isolation with Bubblewrap and Firejail · Agent = Model + Harness: The Mental Model That Changes Everything · Kerf-CLI: SQLite-Backed Cost Intelligence for Claude Code · Sandbox Claude Code with Bubblewrap in 10 Minutes https://dan.dezmirean.ro/mastery/2026-04-07.html https://dan.dezmirean.ro/mastery/2026-04-07.html Tue, 07 Apr 2026 12:00:00 -0000 claude-profile: Run Multiple Subscriptions Side by Side · The LLM Wiki Pattern: Compile Knowledge That Compounds Across Sessions · The Skill Metadata Budget: Why 33% of Your Skills Are Invisible · Repowise: Codebase Intelligence That Goes Beyond File Reading · Index Your Codebase with Repowise's Four Intelligence Layers https://dan.dezmirean.ro/mastery/2026-04-06.html https://dan.dezmirean.ro/mastery/2026-04-06.html Mon, 06 Apr 2026 12:00:00 -0000 /cost Per-Model and Cache-Hit Breakdown · MCP Context Optimization: Tool Search and Result Persistence · Silent Fake Success — The Deadliest Agent Failure Mode · VibeAround: Telegram-to-Claude-Code with Session Handover · Audit Your Agents for Silent Fake Success https://dan.dezmirean.ro/mastery/2026-04-05-weekend.html https://dan.dezmirean.ro/mastery/2026-04-05-weekend.html Sun, 05 Apr 2026 12:00:00 -0000 Ultraplan: The Cloud-to-Terminal Planning Bridge · Custom Subagent Masterclass: 17 Fields, 5 Scopes, Full Autonomy · ~/.claude/ Security Audit: Structure Is Not Security · Conductor: Multi-Session Orchestration via MCP + Remote Control API · Build a Security-Hardened Custom Subagent Fleet https://dan.dezmirean.ro/mastery/2026-04-04-weekend.html https://dan.dezmirean.ro/mastery/2026-04-04-weekend.html Sat, 04 Apr 2026 12:00:00 -0000 Hooks Masterclass: 26 Events, Conditional Logic, and Production Chains · Agent Teams: Multi-Session Orchestration with Shared Tasks · Walls Beat Signs: Why CLAUDE.md Rules Fail Under Pressure · RemembrallMCP: Persistent Code Intelligence That Cuts Token Usage by 98% · Build a Hook-Based Agent Supervision Framework https://dan.dezmirean.ro/mastery/2026-04-03.html https://dan.dezmirean.ro/mastery/2026-04-03.html Fri, 03 Apr 2026 12:00:00 -0000 Rate Limit Monitoring in the Statusline · The defer Hook — Pause-and-Resume for Headless Agents · CLAUDE.md as Attention Budget — The 150-Instruction Ceiling · OpenAI Ships a Codex Plugin for Claude Code · Build a Rate Limit Fuel Gauge