The Daily Index — Thursday, February 12, 2026 · TLDR Index

HEADLINES & LAUNCHES

TLDR AI

TLDR AI

OPENAI WORKS ON CHATGPT SKILLS, UPGRADES DEEP RESEARCH

OpenAI's revamped Deep Research in ChatGPT introduces interactive sessions, allowing constraints on specific websites and app contexts, powered by GPT-5.2. The update benefits analysts, researchers, and professionals by enhancing source control, mid-process intervention, and report clarity. Anticipation grows for GPT-5.3, and potential ChatGPT "Skills" could standardize workflows with installable instructions for repeatable procedures.

testingcatalog.com · 3 min

TLDR AI

HOW CODEX BUILT AN INTERNAL PRODUCT

OpenAI described an internal experiment where a small team shipped a product whose codebase—app logic, tests, CI, docs, and tooling—was generated entirely by Codex agents rather than written by humans.

links.tldrnewsletter.com · 15 min

TLDR AI

HOW COGNITION USES DEVIN TO BUILD DEVIN

Cognition's Devin is a cloud agent platform for engineering teams. It acts like a teammate, handling tasks and creating PRs. Cognition uses Devin for tasks like targeted refactors, bug fixes, PR review, writing unit tests, modernizations and migrations, and more. As a general rule, if a junior engineer could figure it out with sufficient instructions, it's a task Devin can likely complete. However, Devin still struggles with large-scale challenges, UI aesthetics, mobile development, and anything requiring extensive testing and validation.

nader.substack.com · 11 min

TLDR AI

PERPLEXITY COMET: A REVERSING STORY

Comet is an agentic browser that features an AI model that can interact with web pages autonomously. This post details Comet's architecture and explains how the model communicates with the browser, which tools are available, and how the model perceives and interacts with web page content. The browser's architecture is mature and thoughtful. It exposes the model to access to downloads, form filling, file uploads, and arbitrary navigation.

labs.zenity.io · 12 min

TLDR AI

SKILLS IN OPENAI API

The OpenAI API now supports skills, reusable bundles of files that detail repeatable workflows. Agent Skills lets developers upload and reuse versioned skills in hosted and local shell environments. Skills should be used when developers want models to follow a repeatable workflow, use scripts or templates, or execute code in a sandbox. This post details how to create skills via API.

developers.openai.com · 14 min

TLDR AI

THE LLM CONTEXT TAX: BEST TIPS FOR TAX AVOIDANCE

The best teams building sustainable agentic products are obsessing over token efficiency. Every wasted token is setting money on fire. The context tax can be avoided with the right architecture. While context engineering isn't glamorous, it is the difference between a demo that impresses and a product that scales with decent gross margin.

nicolasbustamante.com · 18 min

TLDR AI

THE TWO PATTERNS BY WHICH AGENTS CONNECT SANDBOXES

Sandboxes provide a workspace where agents can run code, install packages, and access files. There are two architectural patterns for integrating agents with sandboxes. The first is where an agent runs inside the sandbox, and the developer communicates with it over the network. The other is when an agent runs locally on a developer's server and then calls a sandbox remotely for execution. deepagents, an open-source agent framework with built-in sandbox support, supports both patterns with a simple configuration.

links.tldrnewsletter.com · 8 min

TLDR AI

QWEN-IMAGE-2.0

Qwen-Image-2.0 is a foundation image model aimed at high-fidelity infographics and realistic 2K outputs with stronger prompt adherence.

qwen.ai · 9 min