the forge
real models, real grading, zero fluff

Learn AI skills
by actually doing them.

Belt-progression games that call real models, grade you against real industry standards, and don't let you advance until you've actually earned it. Built for engineers who learn by shipping, not by reading slides.

26
Belts total
3
Dojos live
7d
Free trial
// choose your dojo
✎
Prompt Forge
Write real prompts, watch Claude actually run them, get graded by an AI coach against Anthropic's and Google's own prompt engineering standards — clarity, examples, chain-of-thought, XML structure, chaining, and TCREI.
8 beltsAI-gradedAnthropic + Google
Enter the dojo →
◈
Vector Forge
Zero to production on embeddings and semantic search. Why keyword search breaks, real toy-vector intuition, genuine embeddings computed live in your browser, through chunking and ANN indexes at scale.
9 beltsRuns in-browserReal vectors
Enter the dojo →
⚙
Tool Forge
Learn reliable tool use and function calling: when to call a tool at all, precise schemas, disambiguation, error handling, parallel vs. sequential calls, grounding, and knowing when an agent should stop.
9 beltsAI-gradedLive tool calls
Enter the dojo →
// coming soon
More dojos are being forged — RAG pipelines, MCP, and agentic reasoning are next up.
built to learn by shipping, not by scrolling