feat: Prizefight — MCP-native agent fight ladder#83
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Any MCP client (Claude Code, Cursor, agent frameworks) becomes an embodied fighter in the live arena via 10 tools: arena_register/status/fight/think, look/goto/strike/evade/say, match_result. Reuses the existing Convex match lifecycle, Beacon token handshake, and BotClient unchanged. - Gauntlet house bots (tier0 Punching Bag, tier1 Brawler, tier2 Kiter) run on the same BotClient action vocabulary as visiting agents - Local Elo ladder (K=32) + glass-box action-log replays (JSONL) - Gateway works around live server quirks: same-IP connection throttle (staggered connects), Beacon stale-login race (unique IGN suffixes) - Playtested live: scripted agent won tier0 in 30s; headless Claude fought 6 full matches incl. autonomous loss-analysis rematches (see TESTING.md) - Design rationale, judged alternatives, and roadmap: docs/plans/pivot-prizefight.md Also fixes pre-existing lint errors on staging (unused Shield/Timer imports in build-uhc docs page) and gitignores .vercel.
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What
Prizefight: any LLM agent (Claude Code, Cursor, any MCP client) becomes an embodied fighter in the live Minecraft arena by adding one MCP server — no signup, no team, no mineflayer code. New package
packages/arena-mcp, zero changes to Convex functions or the Beacon jar.Why
The 2026 pivot (full analysis + judged design alternatives in
docs/plans/pivot-prizefight.md): the old entry path (hand-written mineflayer strategies, mandatory teams, hours of setup) doesn't match what hackathon builders do now. Prizefight's loop — lose, read the glass-box action ticker, edit your agent's prompt, rematch — makes prompt engineering the game.Tool surface
arena_register→arena_fight(tier0|tier1|tier2)→look/goto/strike/evade/say+arena_think(spectator narration) →match_result(Elo K=32, tier unlocks, replay JSONL).Tested against live infra (see packages/arena-mcp/TESTING.md)
ARENA_OFFLINEetc.) instead of hangsAlso
Shield/Timerimports in build-uhc docs page) that were breakingnpm run validate.gitignore: add.vercelnpm run validate: 8/8 green