Haochen Xu

Archive

Writing on software, frontend craft, and things I want to understand better.

This is where I keep my notes, experiments, and longer write-ups. Some posts come from work, some from side projects, and some from going deep on a topic until it finally makes sense.

Agent

6 posts
Agent 5 min read

Why a Few Claude Agent SDK Turns Used Up My 5-Hour Limit

Starting from a Gmail Bridge triggered Claude Code SDK session, this note breaks down how a few visible turns produced 44 model calls, 5.84M cumulative usage tokens, and a depleted 5-hour limit.

AgentClaude CodeClaude Agent SDK

Thoughts

1 posts
Thoughts 4 min read

🧠 What Should LLM-Facing Developers Know?

If building for the internet was the mainstream in the past 20 years, building for LLMs might be the future. Just like how web developers don't need to know the low-le...

Thoughts

DB

1 posts
DB 2 min read

DynamoDB

It is a key-value store like an object. Primary key It is a unique identifier for an item in a table. It is the "key" of the item. It consists of a partition key and a...

DB