Blog

Thoughts on AI, software, and life. Short notes and long-form writing.

Agent Development in Practice: Tool Calling, Task State, Permissions, and Reliability

Build an invoice sync-diagnosis assistant, then learn how permissions, task recovery, idempotency, tests, and evaluation make it reliable.

DatabaseSep 25, 2026

Database Review: SQL, Normalization, NoSQL, and Common Database Types

DatabaseSQLNoSQL

Use a user, product, and order system to explore relational modeling, SQL, normalization, indexes, execution plans, transaction concurrency, NoSQL choices, and recovery.

NetworkingSep 15, 2026

From DNS to Clash TUN: Understanding Proxies, VPNs, CDNs, Firewalls, and Soft Routers

NetworkingVPNClash+4

A practical networking guide covering DNS, TCP/UDP, HTTP/HTTPS, VPNs, Clash, system proxies, TUN, CDN, CIDR, firewalls, network stacks, NAT, and soft routers.

AIJun 23, 2026

AI and Agents Explained: From LLMs and Context to MCP, Skills, and Harnesses

AI AgentLLMMCP+2

Follow simple diagrams and concrete examples to connect LLMs, tokens, prompts, context, tools, MCP, agents, RAG, skills, and plugins.

BackendMay 23, 2026

API Design Review: Authentication, Validation, RESTful APIs, and GraphQL

APIRESTGraphQL

Follow an article management system through authentication, authorization, runtime validation, REST contracts, GraphQL execution, retries, concurrent updates, and error recovery.