WHICH TOOLS DO CLAUDE CODE, CODEX, AND CURSOR CHOOSE?

Summary from the TLDR Dev newsletter

Armature ran 16,893 coding-agent sessions across 75 repositories, 1,163 prompt variants, four developer personas, and Claude Code, Codex, and Cursor to see which third-party tools agents actually implemented. Among 5,292 published valid sessions, the agents agreed only 42% of the time: Codex searched the web in 94% of sessions, Claude Code built in-house nearly twice as often, and repository language strongly changed winners such as Resend on TypeScript, SendGrid on Python, Postmark on Go, and Azure ACS on Java.