This is a more technical document about how the tools work for my Fantasy Football agent in conjunction with https://gridirondata.com. At the top level, the coach is a Strands based AI agent that runs Anthropic Claude Sonnet 5 on Amazon Bedrock. The agent knows about my roster, and other teams rosters in my league which is hosted on ESPN’s Fantasy Football platform.
Lineup Tools:
- Optimize Lineup: Builds the best starting lineup for a team for any given week. It fills every slot with the highest projected eligible player. Projects are adjusted for injury designation and takes into account players who are on a bye week.
- Start or sit advice: Compares the best lineup with the teams current starters and says exactly who to start or who to bench OR that no change is needed
Player Research:
- Analyze player: A full look at one player for one week: projection, injury status, opponent and bye (from the NFL schedule), boom/bust profile and recent news.
- Compare players: Compares two players side by side for a week and recommends one to start.
- Player boom or bust: A player’s season-long deviation profile, showing whether they usually beat or miss their projections and how steady their floor is.
- Player matchup: How a player has scored against a given opponent in the past. If no opponent is given, it looks one up from the schedule.
- Player news: Recent headlines for a player (injury, transaction, role), tagged by impact.
Waivers & Streaming
- Find waiver targets: Ranks free agents (projected players on no league roster) by how much they would improve on your weakest starter at their position, not just by raw projection
- Stream defense: Compares your D/ST with the best free-agent defenses: projection, this week’s and next week’s opponent, history against the opponent, and whether streaming is worth it.
All of these tools have more complex technical code that dictates exactly how they work and access the API. There are also various scoring rules for injured or questionable players. This might result in their projects lowering allowing for a bench player to get the nod to start for the week.
The architecture is a pretty straightforward serverless design that relies on Cloudfront and S3 for frontend delivery and an API gateway to handle the chat.
I use DynamoDB to manage our chat state as well as rosters for every team in the league. Bedrock is the AI layer where Sonnet runs.
Anyway, enough nerd talk. Here is the current roster for week 3:
Notable changes are adding the Chiefs defense against a horrific Miami team. Adding in Josh Downs due to injuries across other wide receivers. I personally would have liked to see the AI select a running back here but it was adamant that Josh Downs was the move.
Another dominate week for us. We are currently in first place in the league. Some players were busts though:
Jeremiyah Love simply didn’t get the ball when I was watching the Cardinals play. I have no idea what happened with Trevor Lawrence. His receivers couldn’t catch or something and apparently Cleveland figured out how to beat up the Buccaneers. Mike Evans went out with injury but dominate performances from Josh Allen and Amon-Ra St. Brown carried us to victory again.
See you all next week for another update. If you want me to expand on any topic here feel free to reach out!
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