Recently, I was buinding with these harnessess ( Codex, Antigravity ) and they are quite surprizing!
Hello,
I'm Vikash Kumar.
Lets talk about the experiences of these two tools ( agentic tools ).
I would not talk about what is harness? How to setup these tools with vscode?
Codex
Codex is a very powerful agentic tool. ( No doubt )
Make sure you've enough ram in your laptop ( system ), because it consumes more ram over a long coding session.
If you are operating within a lower system, the initial ui of Codex inside vscode will take time to initialize because the traditional full-feature AI extensions often embed more of their logic directly into the editor space, maintaining larger local caches and continuous state trees right inside the IDE runtime.
Antigravity
Antigravity tends to feel noticeably lighter in vscode.
When using Antigravity inside VS Code (via extensions like Antigravity for VS Code), the extension acts primarily as a lightweight UI wrapper. The heavy lifting—like managing agent workflows, system-level thinking, and tool execution—is offloaded to a separate local companion CLI binary (agy) running in the background. This keeps VS Code's core Electron process from getting bogged down.
Of course, if you run multiple resource-heavy agent tasks simultaneously, both can spike your CPU, but for everyday responsiveness and editor snappiness, Antigravity’s decoupled design keeps VS Code running lean.
They both are powerful, have their own flaws, use them as per your requirement.
