Three deterministic APIs for the AI agent stack — dictionary, lessons, assessments
design
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The Scenario
162,250 words. 226,725 lessons. 21,900 assessments. 30,288 knowledge-graph connections. Three APIs that give any AI agent a verified vocabulary, a structured lesson plan, and an aligned assessment — deterministic JSON from the Cloudflare edge. Sub-5ms. MCP server live. Here is the complete cycle for one word: “design.” Written by engineers, for the 500K+ engineers reading TLDR AI.
1
Word Orb looks up the word
One API call returns a verified definition, 47 translations, pronunciation audio, and etymology.
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2
Lesson Orb delivers a structured lesson
A 5-phase lesson with the explorer teaching archetype.
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3
Quiz Orb assesses comprehension
Interactive assessment aligned to the lesson. Try it yourself.
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4
The Knowledge Graph connects everything
30,288 connections link words to lessons to assessments.
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Why this matters for TLDR AI
MCP server at mcp.thedailylesson.com/mcp — native integration with Claude Desktop, ChatGPT, Cursor, Gemini, and any MCP-compatible client
Built on Cloudflare Workers + D1 (SQLite at edge) + R2 (object storage) + KV — zero origin server, zero cold starts, sub-5ms p95 latency
Three APIs connected by a knowledge graph with 30,288 edges — Word Orb (dictionary), Lesson Orb (lessons), Quiz Orb (assessments)
Free tier: 50 calls/day, no credit card. npm: @lotd/word-orb. pip: orb-platform. Open-source SDKs on GitHub. 7M+ TLDR readers.