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Complete AI + System Design Handwritten Notes

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A handwritten notes page titled 2. The architecture, step by step. Part A, indexing: four boxes with arrows, Load, Chunk, Embed and Store, with the Confluence, Notion, LangChain, OpenAI, Postgres and Qdrant logos. Part B, answering: six boxes in a U shape from Question to Retrieve, Rerank, Prompt, LLM and Answer. Underneath, the prompt template.

A handwritten notes page titled 3. Why agents fail as tasks get longer, with the formula task success = p to the power n, hatched bars for 3, 5, 10, 20 and 50 steps at 95% per step, a table of step failures and their first fix, and a box about idempotency keys.

A handwritten notes page titled 3. The KV cache, with the formula KV bytes per token = 2 x layers x KV heads x head size x bytes per number, a worked table for Llama 3 70B and qwen2.5 1.5B, and bars comparing model weights with the KV cache for one and for 32 chats.

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