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Mitchell Hashimoto

Mitchell Hashimoto

Creator
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Co‑founder of HashiCorp, creator of Vagrant, Terraform, now building Ghostty, speaks on infrastructure automation.

Make GitHub Core Agentic Infrastructure, Ditch Copilot
Social•Mar 25, 2026

Make GitHub Core Agentic Infrastructure, Ditch Copilot

Here’s what I’d do if I was in charge of GitHub, in order: 1. Establish a North Star plan around being critical infrastructure for agentic code lifecycles and determine a set of ways to measure that. 2. Fire everyone who works on or advocates for copilot and shut it down. It’s not about the people, Im sure theres many talented people, youre just working at the wrong company. 3. Buy Pierre and launch agentic repo hosting as the first agentic product. Repos would be separate from the legacy web product to start since they’re likely burdened with legacy cross product interactions. 4. Re-evaluate all product lines and initiatives against the new North Star. I suspect 50% get cut (to make room for different ones). The big idea is all agentic interactions should critically rely on GitHub APIs. Code review should be agentic but the labs should be building that into GH (not bolted in through GHA like today, real first class platform primitives). GH should absolutely launch an agent chat primitive, agent mailboxes are obviously good. Etc. GH should be a platform and not an agent itself. This is going to be very obviously lacking since I only have external ideas to work off of and have no idea how GitHub internals are working, what their KPIs are or what North Star they define, etc. But, with imperfect information, this is what I’d do.

By Mitchell Hashimoto
Windows CI Now Fully Tests and Builds Libghostty‑vt
Social•Mar 23, 2026

Windows CI Now Fully Tests and Builds Libghostty‑vt

Big day for Windows + libghostty-vt: - We now run the full unit tests on Windows in CI - We now build libghostty-vt in CI - We fixed a ton of issues related to MSVC with libghostty-vt - CMake now supports building libghostty-vt...

By Mitchell Hashimoto
Call for Regulation: AI Must Disclose Consent
Social•Mar 16, 2026

Call for Regulation: AI Must Disclose Consent

It's so insanely disrespectful for an AI agent to talk to real people without consent or at least disclosure. This is the type of stuff I'm hugely supportive of government regulation. The FCC must expand the definition of robocalling and...

By Mitchell Hashimoto
Success Grants Me Flexible Bi‑City Family Time
Social•Mar 13, 2026

Success Grants Me Flexible Bi‑City Family Time

The greatest privilege my past success has gotten me is that I can wake my daughter up at 730, eat breakfast with my family in LA, be in SF by 915, have a full day of work until 5, and...

By Mitchell Hashimoto
Separate Devices and Silence Notifications to Stay Smarter
Social•Mar 11, 2026

Separate Devices and Silence Notifications to Stay Smarter

This is how you get dumber btw, true even before AI. Turn on DnD, put your phone in a drawer. The best option if you can is to separate work + personal devices so your work device can't even see...

By Mitchell Hashimoto
Codex Xhigh Cracks 6‑month Bug by Digging Into GTK4
Social•Mar 5, 2026

Codex Xhigh Cracks 6‑month Bug by Digging Into GTK4

Ahhhh, Codex 5.3 (xhigh) with a vague prompt just solved a bug that I and others have been struggling to fix for over 6 months. Other reasoning levels with Codex failed, Opus 4.6 failed. Cost $4.14 and 45 minutes. Full...

By Mitchell Hashimoto
AFL++ Integration Makes Libghostty Fuzzing Fast and Fun
Social•Mar 1, 2026

AFL++ Integration Makes Libghostty Fuzzing Fast and Fun

I'll write more about this later, but I've spent the past few days hooking up libghostty with AFL++ and fuzzing various parts of it and agents make the full path of fuzz => verify with test case => minimize =>...

By Mitchell Hashimoto
Agents Will Eclipse GUIs, Boosting Libghostty Adoption
Social•Feb 28, 2026

Agents Will Eclipse GUIs, Boosting Libghostty Adoption

Love to see it! Prediction: within a couple years the terminal GUI will no longer be the primary interface to agents, but there's going to be a hell of a lot of libghostty because agents are going to be increasingly...

By Mitchell Hashimoto
Codex 5.3 Replaces Opus 4.6 for Me
Social•Feb 25, 2026

Codex 5.3 Replaces Opus 4.6 for Me

I know this is pretty well established at this point, but Codex 5.3 is a much more effective model than Opus 4.6. I went back and forth on both for a bit, but haven’t touched Opus at all now for...

By Mitchell Hashimoto
MacOS Terminal Adds Vertical Tabs, Scriptable Browser
Social•Feb 20, 2026

MacOS Terminal Adds Vertical Tabs, Scriptable Browser

Another day another libghostty-based project, this time a macOS terminal with vertical tabs, better organization/notifications, embedded/scriptable browser specifically targeted towards people who use a ton of terminal-based agentic workflows. https://t.co/9SLNCxM21S

By Mitchell Hashimoto
GitHub PR Navigation Speed Boost Improves Daily Workflow
Social•Feb 18, 2026

GitHub PR Navigation Speed Boost Improves Daily Workflow

GitHub issue/PR navigation is significantly faster recently. Large PRs also render so much better [on Safari, especially]. It is noticeably improving my day since I navigate between them with high frequency. Thanks to whoever made this happen. ❤️

By Mitchell Hashimoto