Dev built an MCP server that took Claude to FPL's top 1% — and shares lessons on slow tools
HistoricalKiwi6139 · reddit · 2026-11-16
To prove friends wrong that AI can't do fantasy football, the author fed Claude match heatmaps and finished top 1% in a World Cup fantasy game, then built Prevedo — a remote MCP server for Fantasy Premier League (11M players) with OAuth and 20 tools, working in Claude, ChatGPT, Cursor, and Gemini CLI, priced from £2.99/month.
Two lessons for agent builders:
- Slow tools: the transfer planner is a six-week squad solver taking 10–25s. Instead of blocking, it returns status: "solving" with retryafterseconds, relying on server instructions so the model retries with the same args. Plans are cached on a projections digest; timeouts return proven: false so the model calls it a good plan, not the best one.
- Don't let the model do maths it'll get wrong: no compare tool exists — transfer answers only come from the planner; gains under 2 points over six weeks are ties; fixtures are written from the player's side because models kept flipping home/away.
More from coding & agent
- Dev says Opus 5.5 is first model he can trust, now orchestrates a fully automated agent factory — jiayuan_jy · 2026-11-16
- Dev builds interactive 3D physics book on flight with Opus 5.5, Blender and Three.js — techartist_ · 2026-11-16
- Power user runs 5,000+ agent tasks on MulticaAI over a few months — jiayuan_jy · 2026-11-16
- 18 open-source skills turn Claude into an animation studio, led by Remotion's 7.2k-star Agent Skills — blaizedsouza · 2026-11-16
- Founder tested 12 startup ideas with cold emails at once — one got 14 yeses — doooyle · 2026-11-16
- AI-driven database optimization cuts storage/IO by ~75% and speeds queries ~85% — blaizedsouza · 2026-11-16