Developer-Tools

Cursor in JetBrains and the End of IDE Lock-In

One of the quietest but most important developer-tooling stories of March 2026 is that Cursor is now available directly inside JetBrains IDEs through the Agent Client Protocol, or ACP, registry.

At first glance, this looks like a convenience feature. Cursor users can keep their preferred agent while staying in IntelliJ IDEA, PyCharm, or WebStorm. JetBrains users get access to a popular agentic workflow without switching editors. Nice, but not transformative.

Codex Security and the Rise of AI Reviewing AI

The next big shift in AI-assisted software development is not more code generation. It is AI for verification.

OpenAI’s new Codex Security research preview, announced in early March 2026, is a good signal of where the market is going. The product scans repositories commit by commit, builds repository-specific threat models, validates findings in isolated environments, and ranks issues with proposed fixes. OpenAI says early adopters used it to detect more than 11,000 critical and high-severity vulnerabilities while cutting false positives by more than 50%.

The OpenAI Codex App and What Multi-Agent Development Actually Looks Like

In February 2026, OpenAI shipped a standalone Codex app. The headline is straightforward: it lets you manage multiple AI coding agents across projects, with parallel task execution, persistent context, and built-in git tooling. It’s currently available on macOS for paid ChatGPT plan subscribers.

But the headline undersells what’s actually happening. The Codex app isn’t just a better chat interface for code—it’s an early, concrete version of what multi-agent software development looks like when it arrives as a consumer product. Understanding what it actually does (and doesn’t do) matters for any team thinking seriously about AI-assisted development in 2026.

MCP: The Integration Standard That Quietly Became Mandatory

If you were paying attention to AI tooling in late 2024, you heard about the Model Context Protocol (MCP). If you weren’t, you may have missed the quiet transition from “Anthropic’s new open standard” to “the de facto integration layer for AI agents.” By early 2026, MCP has 70+ client applications, 10,000+ active servers, 97+ million monthly SDK downloads, and—in December 2025—moved to governance under the Agentic AI Foundation under the Linux Foundation. Anthropic, OpenAI, Google, Microsoft, and Amazon have all adopted it.

SERA and the Case for Open-Source Coding Agents That Know Your Repo

If your team has tried Cursor, Copilot, or other AI coding tools and found them underwhelming on your codebase—wrong conventions, missing context, generic suggestions—you’re running into a fundamental limit: those models are trained and optimized for the average repo, not yours. In early 2026, AI2 (Allen Institute for AI) released SERA (Soft-Verified Efficient Repository Agents), an open-source family of coding agents built for something different: specialization to your repository through fine-tuning, at a cost that makes it realistic for more teams.