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<div style="display: none; max-height: 0px; overflow: hidden;">Harness engineering is where engineers focus more on building the environment and “harnesses” (like OpenAI’s Codex) around AI agents </div>
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<h1><strong> TLDR Dev <span id="date">2026-05-04</span></strong></h1>
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<strong>Harness Engineering: How OpenAI Ships Without Writing Code (11 minute read)</strong>
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Harness engineering is where engineers focus more on building the environment and “harnesses” (like OpenAI's Codex) around AI agents, so that they can build software without manually written code. OpenAI's approach involved making applications legible for agents to query runtime states and structuring documentation with progressive disclosure using an AGENTS.md table of contents. To manage high agent throughput, OpenAI adopted a merge philosophy prioritizing fast corrections over perfect prevention, and continuously addressed technical debt through "golden principles" enforced by background cleanup agents.
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AI agent harnesses, the control loops driving LLMs, can be architected either inside or outside the execution sandbox, each with distinct implications for security and multi-user environments. Mendral, building multi-user agents, chose to run the harness outside the sandbox to improve security by keeping credentials separate, have efficient sandbox lifecycle management, and simplify shared state.
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In computing, abstracting away complexity has reduced developers' understanding, leading to a decline in software quality over time. Historically, deep knowledge of machine operation was necessary, but as resources grew, reliance on pre-built libraries led to less rigorous development practices. The advent of LLMs now allows almost anyone to generate functional but often poor-quality software, making expertise even more necessary.
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Agent Desktop is a native desktop automation CLI built with Rust, designed for AI agents to interact with any application via OS accessibility trees. It provides structured JSON output and deterministic element references, removing the need for screenshots or pixel matching. The tool has 53 commands for observation and interaction, including progressive skeleton traversal to optimize token usage for AI models.
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<div style="text-align: center;"><strong><h1>Miscellaneous</h1></strong></div>
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<strong>Why TUIs are back (7 minute read)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
Native GUI development across Windows, Linux, and macOS has become fragmented and inconsistent, leading to the widespread adoption of Electron apps that often lack essential keyboard-driven workflows. Terminal User Interfaces (TUIs) are experiencing a resurgence as fast, automatable, and consistently functional alternatives that transcend these operating system-specific limitations, though AI is allowing native desktop apps to also make a comeback as they get better at developing them.
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<strong>How fast is a macOS VM, and how small could it be? (11 minute read)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
Recent performance benchmarks on Apple silicon show that virtual machines maintain nearly native CPU and GPU speeds, making them great for daily tasks. Even with minimal resources like 4 GB of RAM, these environments are functional for lightweight usage on modern hardware like the MacBook Neo.
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<h1><strong>Quick Links</strong></h1>
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<strong>Security Through Obscurity Is NOT Bad (10 minute read)</strong>
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Security through obscurity is not inherently bad but rather a valuable additional layer that increases attacker cost and time.
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<a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fxogium.me%2Fthe-text-mode-lie-why-modern-tuis-are-a-nightmare-for-accessibility%3Futm_source=tldrdev/1/0100019df2ad9762-cc23e42d-8345-44fd-8b47-2f84702dd519-000000/l_KVra1ASweUJik_AoUgASxjDp18twObY2fG4VMFQp8=452">
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<strong>The text mode lie: why modern TUIs are a nightmare for accessibility (7 minute read)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
Modern terminal user interfaces (TUIs) built with declarative frameworks are often inaccessible to blind users because they treat the terminal as a reactive 2D canvas, leading to constant, disorienting screen reader updates and performance issues.
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<strong>Open Design (GitHub Repo)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
Open Design is an open-source, local-first alternative to Claude Design that uses user-provided coding agents and/or API keys to generate various design artifacts, from web prototypes to images and videos.
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<strong>Understand Anything (GitHub Repo)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
Understand-Anything transforms any codebase or knowledge base into an interactive knowledge graph that users can explore, search, and ask questions about.
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