Explore the knowledge library
This archive contains only material that is currently maintained. Pages come from scoped practical work or source-bounded research; material that cannot be reviewed reliably is revised, replaced, or removed from the public index.
What Breaks a Planning Calculator? A Boundary-Test Study of Three Engines
A reproducible test of compound-growth, emergency-fund, and LLM-cost calculators using zero returns, impossible goals, fee math, contribution timing, caching, and exhausted budgets.
AWS Agent Toolkit in the CLI: A Practical Guide to Skills, MCP, IAM, and Safe Rollout
AWS CLI 2.35 adds a guided Agent Toolkit setup for coding agents. This guide explains what it installs, where the security boundary really sits, and how to evaluate it without granting excessive cloud access.
The small tools that save me hours every week
A growing toolbox of simple automations, browser utilities, and scripts for independent developers.
How to Subscribe to ChatGPT on iPhone for Codex: A Safe, Region-Aware Guide
A practical guide to checking Codex eligibility, using Apple Account balance, subscribing in the ChatGPT iOS app, and avoiding region, gift-card, and duplicate-charge problems.