[Saffsanity]

Sill for Mac now installs with Homebrew, from Sill's own tap, Saffsanity/homebrew-sill (made today, public, its brew test-bot run green):

brew install --cask saffsanity/sill/sill

That command taps the repository and trusts the one cask. Homebrew 6 and later load nothing else from a tap that isn't Homebrew's own until it is trusted: with the tap added by brew tap saffsanity/sill alone, brew install --cask sill stops at "Refusing to load cask saffsanity/sill/sill from untrusted tap saffsanity/sill" until brew trust --cask saffsanity/sill/sill (tried here).

This pull request is the words: the site's download page (a line under the download card), the README's install sentence, docs/release-checklist.md (part 1 §6, the tap and the move to Homebrew's main repository; part 2, bump the cask after each release) and docs/DEVELOPMENT.md (Releasing).

The cask

cask "sill" do
  version "0.5.1"
  sha256 "891d4a104023a2da5ceaf6f0a1573b333ebc1a5091b39ba376eee3f9edc9d63d"

  url "https://github.com/Saffsanity/sill/releases/download/v#{version}/Sill.dmg"
  name "Sill"
  desc "Streams windows to an iPhone or iPad with touch, Pencil and keyboard control"
  homepage "https://getsill.app/"

  livecheck do
    url :url
    strategy :github_latest
  end

  depends_on arch: :arm64
  depends_on macos: :sonoma

  app "Sill.app"

  zap trash: [
    "~/Library/Logs/Sill",
    "~/Library/Preferences/me.saffer.sill.mac.plist",
  ]
end

Homebrew 7.0.8's rules shaped it: desc may not name the platform, so no "Mac" (the Cask/Desc cop); the url stanza's verified: is deprecated and ignored now, so there is none; depends_on macos: ">= :sonoma" is deprecated for the symbol form; GithubLatest is the livecheck the docs give for a cask that downloads a release asset. The minimum and the architecture are the app's own (LSMinimumSystemVersion 14.0, an arm64-only binary), the SHA-256 equals the release's Sill.dmg.sha256, and the zap paths are all Sill leaves outside the keychain (the code, the privacy page, and this Mac's ~/Library). No auto_updates (Sill's update check only opens the release page), no caveats, and no uninstall quit:, which would quit a running Sill on every brew upgrade.

Checked (Homebrew 7.0.8, this Mac)

• brew style: no offenses. brew audit --cask --online --strict, brew readall --os=all --arch=all and the tap's brew audit: no problems.
• brew fetch --cask --force: downloaded and verified. brew livecheck --cask saffsanity/sill/sill: sill: 0.5.1 ==> 0.5.1 (GithubLatest).
• brew install --cask --appdir=<scratch> and brew uninstall --cask, three times: from a local copy of the tap and from the GitHub tap after brew tap and brew trust (both with HOMEBREW_NO_INSTALL_FROM_API=1, as homebrew/cask's template asks), and with the one-line command above, untapped first: each moved Sill.app into the scratch folder (codesign valid, spctl "Notarized Developer ID", gktool scan allowed with the usual first-launch question) and removed it. /Applications/Sill.app and the running Sill (the same inode, times and executable hash, the same process) were never touched, and nothing ran --zap.
• The tap's workflow: brew test-bot --only-cleanup-before, --only-setup, --only-tap-syntax, and brew audit --cask --online --strict, green on macos-26 (run 38510376937).

Homebrew's main repository: not yet

brew audit --cask --new --online --strict saffsanity/sill/sill fails one rule today:

audit for sill: failed
 - GitHub repository too new (22 days old, 30 days required)

Notability passed (228 stars against 75). In homebrew/cask's own checks two more rules apply: the homepage's domain must be 30 days old (getsill.app, registered 2026-09-25), and a pull request from the repository's owner is a self-submission needing 90 forks, 90 watchers or 225 stars (228 today). So the earliest day is 2026-10-25, while the stars stay at 225 or more. Homebrew's AI rules make that pull request Noah's own: no AI co-author trailer, the tool named in the description, every review comment answered by Noah without AI. docs/release-checklist.md part 1 §6 has the steps and the tap's migration after.

For Noah

• After merging, republish the site (sill-site), so the download page shows the line.
• On 2026-10-25 or later, if you want Sill in homebrew/cask: the steps in part 1 §6, as your own pull request.
• With each release: bump the cask in the tap (part 2).

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