Nelson v2.2.3 Released: Multi-Agent Coordination for Claude Code, Plus a Discrete-Event Simulation Benchmark

Nelson v2.2.3 is out — a multi-agent coordination skill for Claude Code that uses a Royal Navy metaphor (admiral, captains, ships, crew) to keep parallel agents from stepping on each other's work. MIT licensed, ~300 stars on GitHub.

Installation

Run these commands inside Claude Code:

/plugin marketplace add aspegio/nelson
/plugin install nelson@nelson
Use Nelson to build me a battleships game.

Then observe admiral, captains, and ships coordinating.

Benchmark Results

The real news is a benchmark built by the same author. It tests 13 combinations of model, CLI, and skill on a discrete-event simulation task (synthetic mine throughput). Quality scores (out of 100):

• ouroboros-max-thinking (opus-4-7): 97
• plan-mode (opus-4-7): 96
• agent-teams-nelson-max-thinking (opus-4-7): 95
• superpowers-max-thinking (opus-4-7): 94
• max-thinking (opus-4-7): 92
• vanilla-max (sonnet-4-6): 85
• xhigh (gpt-5-5, codex): 85
• customtools (gemini-3.1-pro): 81

Key takeaway: nelson lost to ouroboros and plan-mode by 1–2 points but beat superpowers by 1, vanilla max-thinking by 3, and sonnet without thinking by 10. Plan-mode (no skills) took second place — curated skills didn't open a large gap. The model and whether thinking is enabled mattered far more than skill choice.

Caveats: n=1 task, quality scored against a rubric written by Nelson's author, no combined cost/accuracy metric yet.