VS Code Repo Tint

Give each repo a stable, distinct workbench background so two VS Code windows are never confused. The color lives in <repo>/.vscode/settings.json under workbench.colorCustomizations, so it loads every session automatically — no per-session step.

Two modes

1. Deterministic (default). SHA-256-hash the repo's GitHub slug (owner/name, lowercased, .git stripped, normalized from both git@ and https:// remotes) into a hue 0–360. Same repo always yields the same color; different repos differ. A repo with no origin remote falls back to a local/<folder> slug so it still gets a stable color.
2. Manual override. When the user names a color or a feel ("dark grey with a 10% blue tinge", "warmer", "less green"), translate that into concrete HSL knobs and pass them instead of using the hash. This stamps a marker so the hash can't later clobber the hand-picked color.

Locate this skill, then call its script by absolute path

The bundled script must be invoked by its absolute path, never a CWD-relative one, so it works from any working directory. Discover the skill dir once (preferring install roots, traversing symlinked installs with find -L, requiring a real match so an empty result can't collapse to .):

SK=""
for root in "$HOME/.claude/skills" \
            "$(git rev-parse --show-toplevel 2>/dev/null)/.claude/skills" \
            "$(git rev-parse --show-toplevel 2>/dev/null)/skills"; do
  [ -d "$root" ] || continue
  hit=$(find -L "$root" -path '*vscode-color/SKILL.md' 2>/dev/null | head -n1)
  [ -n "$hit" ] && { SK=$(dirname "$hit"); break; }
done
[ -n "$SK" ] || { echo "vscode-color: skill dir not found — pass it by absolute path" >&2; exit 1; }

Then every call below is python3 "$SK/vscode-color.py" .... The script targets the cwd's git repo by default; pass --repo <path> to target another. It needs nothing but Python 3 and git.

The run

1 — Preview before writing

Always show the user the slug and resulting hex first — nothing is written:

python3 "$SK/vscode-color.py" --print              # deterministic
python3 "$SK/vscode-color.py" --print --light      # light-theme variant

For a manual request, preview the override instead (see Manual override below).

2 — Write the tint

python3 "$SK/vscode-color.py"                      # deterministic, dark
python3 "$SK/vscode-color.py" --light              # deterministic, light

The script merges into <repo>/.vscode/settings.json under workbench.colorCustomizations, preserving every other key in the file, and creates .vscode/ if missing.

Sandbox gotcha: writing .vscode/settings.json can fail under a command sandbox with Operation not permitted. The script writes the file natively (Python), not via a shell redirect — but the launch is still sandboxed. If the write errors with Operation not permitted, re-run that one command with the sandbox disabled (dangerouslyDisableSandbox: true). Don't disable it for the --print preview; only for the actual write.

3 — Tell the user to reload

The colors apply on the next window load. Tell them: Cmd+Shift+P → "Developer: Reload Window" (or reopen the folder).

4 — Ask once: commit or ignore

Ask one time whether .vscode/settings.json should be:

• committed — the whole team shares the repo's color, or
• gitignored — the tint is personal (add .vscode/settings.json to .gitignore).

Don't ask every run; once per repo is enough.

Manual override

When the user names a color or feel, translate it into HSL knobs and pass them. Any of --hue/--sat/--lightness/--accent-lightness switches the script to manual mode and stamps the marker.

python3 "$SK/vscode-color.py" --print --hue 240 --sat 0.12   # preview first
python3 "$SK/vscode-color.py" --hue 240 --sat 0.12           # then write

• --hue 0–360 (0 red, 120 green, 240 blue), --sat 0–1 (default 0.12), --lightness editor bg 0–1 (default 0.13 dark / 0.94 with --light), --accent-lightness for the title/status bar.
• "N% blue tinge" on a neutral dark grey = a near-neutral grey with the blue channel raised relative to red. Use --hue 240 and a low --sat: roughly --sat 0.10 gives B−R ≈ 6 (5%), --sat 0.18 gives B−R ≈ 12 (10%). Bump --lightness for a lighter grey.
• "warmer" / "less green" / "more X" — nudge --hue (toward 30 for warm, away from 120 for less green) and re-preview. Iterate on the preview, not on the user's editor.

Palette rules (baked into the script)

• Dark-theme tuned: low saturation (hash mode 0.30–0.50), dark editor lightness (~0.13). --light flips to lightness ~0.94.
• Seven surfaces are tinted so the window reads as one color: editor.background, sideBar.background, activityBar.background, panel.background, tab.activeBackground (= editor bg), titleBar.activeBackground and statusBar.background (a lighter accent band).
• Sidebar / activity bar / panel sit slightly darker than the editor; title and status bar sit lighter.

The clobber guard

After a manual override the script writes a top-of-file marker key, "// vscode-repo-tint": "manual". Deterministic mode then refuses to overwrite that repo (exit 3) and prints why — so a later "tint my repos" sweep can't silently replace a hand-picked color. To intentionally replace a manual tint with the hash color, pass --force (which also clears the marker).

Exit codes

0 ok · 2 not inside a git repo · 3 refused (manual marker present, no --force) · 4 existing settings.json is unparseable (refused rather than clobber hand-edited config).

When NOT to use

• Global VS Code theming. This writes per-repo workspace settings only; for a user-wide theme, the user wants their User settings.json or a theme extension, not this.
• A non-git folder. The deterministic color is keyed off the git slug; outside a repo the script exits 2. (A repo with no remote still works via the local/<folder> fallback.)
• One window, no confusion. If the user only ever has one VS Code window open, a per-repo tint solves a problem they don't have — say so rather than tinting reflexively.