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§ The diary · page 2
76 articles on web development, tooling, React, JavaScript, and practical frontend work.
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"JavaScript"
A production guide to Programmatic Tool Calling in the OpenAI Responses API, including tool eligibility, structured contracts, nested-call continuation, routing boundaries, and operational safeguards.
Jul 17, 2026· 13 min read

"JavaScript"
A production-minded LiteRT.js guide for running compatible AI models locally in the browser, from conversion and WebGPU execution to fallbacks, memory cleanup, caching, and testing.
Jul 14, 2026· 13 min read
Developer Tools
A step-by-step walkthrough of installing ZCode, configuring Z.ai's open-weight GLM-5.2 model, running Goal Mode and MCP, and calling the API directly — plus how it stacks up against Claude Code, Cursor, and GitHub Copilot.
Jul 11, 2026· 13 min read
LLM
Context engineering, not prompt engineering, is what keeps AI agents coherent past a few turns. This guide covers the four core techniques (write, select, compress, isolate) with runnable Python examples for each.
Jul 10, 2026· 14 min read

AI Agents
A practical breakdown of GitHub Copilot's new AI Credits billing — how tokens convert to dollars, what every plan includes, and how to keep one agent session from eating your month's allowance.
Jul 9, 2026· 13 min read

AI Agents
A practical guide to securing remote MCP servers with OAuth 2.1-style discovery, PKCE, resource-bound tokens, token validation, and production-safe scopes. Includes a checklist, runnable Express middleware, and the failure modes developers usually miss.
Jul 9, 2026· 15 min read
A guide to the best free browser-based developer tools — JSON formatters, TypeScript generators, CSS visualizers, regex testers, and more. All 85+ tools run 100% client-side with no data leaving your browser.
May 23, 2026· 4 min read

Developer Tools
A practical guide to writing CLAUDE.md as a permission contract for AI coding agents, covering tool tiers, hard stops, failure behavior, and MCP server security.
May 6, 2026· 10 min read
Agentic Workflows
OpenHands agent skills let you package repetitive coding workflows into version-controlled, team-shareable instructions that trigger automatically, ending the repeated-prompt problem across sessions.
Apr 30, 2026· 8 min read

AI Tools
Every major AI coding tool raised its price or restructured plans in April 2026. Here is what changed, why agentic workflows broke the old economics, and how to figure out what you should actually be paying.
Apr 28, 2026· 7 min read