Vercel
Agent Harness Engineer
2026 - Present
Pranit Sharma
About
I'm Pranit, and I make developer tools at Vercel. I'm currently building fx, a small open-source coding agent written in Zig. It runs in your terminal or inside other apps. Before Vercel I founded Recursive Labs, where I built Agents SDK and Orbit, an AI-native IDE for macOS. I also write about building software with AI.
Projects
A tiny, open, native coding agent written in Zig, designed as a minimal Unix-like CLI and an embeddable harness for larger systems.
Orbit
2024 - Present
An AI-native IDE for macOS, with one agent that works across your editor, terminal, docs, and a built-in browser.
Agents SDK
2024 - Present
An open-source Rust backend for building agents on Claude, ChatGPT, and Copilot.
Nightshift + Recursive
2025 - Present
An autonomous engineering system that hardens codebases and builds features overnight, on a portable orchestration framework.
OPS
2025 - Present
A code-quality checker for AI-generated code that enforces your project's rules as files change.
An agent that drafts X replies using X's open-source Phoenix scoring model, then posts them.
A library of reusable agent skills for Orbit, Claude Code, Cursor, Codex, and 38+ other coding assistants.
Mosaic
2025 - Present
An in-app testing framework that runs inside your live web app and catches race conditions without mocks.
Writings
High, Extra High, Max, Ultra: Reasoning Levels Are Making Models Dumber
6 min read
Measure Once: Rebuilding Chat Virtualization for AI-Era Apps
15 min read
Introducing OPS: The System That Makes AI Write Code Like a Senior Engineer
8 min read
Introducing Nightshift: An Autonomous Overnight Agent That Actually Works
7 min read