---
name: cmux Ghostty
slug: cmux-ghostty
category: DevOps
description: cmux Ghostty provides workflow rules for the Ghostty submodule and GhosttyKit builds in the cmux project. Use it when modifying the ghostty submodule, rebuilding GhosttyKit.xcframework, updating the parent submodule pointer, or documenting fork conflict notes.
github: "https://github.com/manaflow-ai/cmux/tree/main/skills/cmux-ghostty"
language: Swift
stars: 26034
forks: 2205
install: "npx degit https://github.com/manaflow-ai/cmux/tree/main/skills/cmux-ghostty ~/.claude/skills/cmux-ghostty"
installs_to: ~/.claude/skills/cmux-ghostty
source_path: skills/cmux-ghostty/SKILL.md
collection_size: 20
category_size: 798
collection_url: "https://dirskills.com/collections/manaflow-ai/cmux"
added: 2026-08-14T07:12:06.615Z
last_synced: 2026-08-14T07:12:06.615Z
canonical_url: "https://dirskills.com/skills/cmux-ghostty"
---

# cmux Ghostty

cmux Ghostty provides workflow rules for the Ghostty submodule and GhosttyKit builds in the cmux project. Use it when modifying the ghostty submodule, rebuilding GhosttyKit.xcframework, updating the parent submodule pointer, or documenting fork conflict notes.

**Install:**

```bash
npx degit https://github.com/manaflow-ai/cmux/tree/main/skills/cmux-ghostty ~/.claude/skills/cmux-ghostty
```

## README

# cmux Ghostty

## GhosttyKit builds

Always rebuild the xcframework with Release optimizations:

```bash
cd ghostty && zig build -Demit-xcframework=true -Dxcframework-target=universal -Doptimize=ReleaseFast
```

## Submodule workflow

Ghostty changes are committed in the `ghostty` submodule and pushed to the `manaflow-ai/ghostty` fork. Keep `docs/ghostty-fork.md` current with fork changes and conflict notes.

Always run `git remote -v` first and push to whichever remote is `manaflow-ai/ghostty`. `.gitmodules` sets the submodule URL to that fork, so in a normal checkout it is `origin`; older setups tracked upstream as `origin` and added the fork as `manaflow`. Substitute the right name below.

```bash
cd ghostty
git remote -v                  # find the manaflow-ai/ghostty remote (usually origin)
git checkout -b <branch>
git add <files>
git commit -m "..."
git push origin <branch>
```

To pull in changes from upstream `ghostty-org/ghostty`, add it as an explicit remote first, since no checkout has it by default:

```bash
cd ghostty
git remote add upstream https://github.com/ghostty-org/ghostty.git   # once
git fetch upstream
git checkout main
git merge upstream/main
git push origin main
```

Then record the new SHA in the parent repo:

```bash
cd ..
git add ghostty
git commit -m "Update ghostty submodule"
```

## Submodule safety

For any submodule (ghostty, `vendor/bonsplit`, `homebrew-cmux`), push the submodule commit to its remote branch **before** committing the updated pointer in the parent repo. Never commit on a detached HEAD or a temporary branch: the parent then points at a SHA unreachable from any remote branch, and a future checkout or CI job fails to fetch it.

Verify the commit is reachable from the branch the pointer should track, using the remote you just pushed to:

```bash
cd ghostty && git fetch origin main && git merge-base --is-ancestor HEAD origin/main
```

## Detailed reference

- [references/submodule-safety.md](references/submodule-safety.md): the ordered safe sequence and fork documentation expectations.