Kickbacks.ai on Antigravity IDE

Problem

Kickbacks.ai extension installed on Antigravity IDE (Google's VS Code fork) was not injecting ads into Claude Code's chat — it worked on normal VS Code but was "silent" on Antigravity.

Root Cause

Kickbacks.ai locates Claude Code by scanning extension directories of known editors in locate.ts / registry.ts:

HOST_ROOT_DIRS = [
  ".vscode", ".vscode-insiders",
  ".vscode-server", ".vscode-server-insiders",
  ".cursor", ".cursor-server"
  // ❌ DIDN'T HAVE antigravity!
]

But Antigravity IDE stores extensions in two locations:

Path	Contents
~/.antigravity-ide/extensions/	Extensions from Antigravity IDE itself (Kickbacks, active Claude Code)
~/.antigravity/extensions/	Extensions from Antigravity.app (older version of Claude Code, 2.1.122)

The Claude Code process that actually runs is in:

~/.antigravity-ide/extensions/anthropic.claude-code-2.1.193-darwin-arm64/

While ~/.antigravity/extensions/ only has an old version (2.1.122) that isn't even loaded.

O Fix

Patch applied directly to dist/extension.js of Kickbacks installed in ~/.antigravity-ide/extensions/kickbacksai.kickbacks-ai-0.3.177/.

1. Add .antigravity-ide and .antigravity to HOST_ROOT_DIRS

var HOST_ROOT_DIRS = [
  ".antigravity-ide",    // ← NEW (priority)
  ".antigravity",        // ← NEW (fallback)
  ".vscode",
  ".vscode-insiders",
  ".vscode-server",
  ".vscode-server-insiders",
  ".cursor",
  ".cursor-server"
];

2. Update hostRootOrder to prioritize Antigravity

function hostRootOrder(execPath = process.execPath) {
  const p = (execPath || "").toLowerCase();
  const preferred = p.includes("antigravity")
    ? [".antigravity-ide", ".antigravity"]    // ← detects Antigravity IDE
    : p.includes("cursor")
      ? [".cursor", ".cursor-server"]
      : p.includes("insiders")
        ? [".vscode-insiders", ".vscode-server-insiders"]
        : [];
  return [...preferred, ...HOST_ROOT_DIRS.filter((d) => !preferred.includes(d))];
}

3. Side issue: Restart Extensions cancelled

The command workbench.action.restartExtensionHost does not exist in Antigravity IDE (fork). When clicking "Restart extensions now" in the Kickbacks menu, it shows "cancelled". Workaround: close and reopen Antigravity (Cmd+Q).

If you want to fix this too, replace restartExtensionHost with reloadWindow in dist/extension.js (3 occurrences).

How to apply

# Kickbacks path in Antigravity IDE
EDITOR_DIR=~/.antigravity-ide/extensions/kickbacksai.kickbacks-ai-0.3.177

# Edit dist/extension.js with ast-grep or sed
# (see sections 1 and 2 above)

After editing, do a full restart of Antigravity IDE (Cmd+Q).

Diagnosis

Run Kickbacks: Menu → "Re-apply patch now" to verify the patch on Claude Code was applied.

Relevant commands

# Where Claude Code runs in Antigravity
ls -la ~/.antigravity-ide/extensions/anthropic.claude-code-*/

# Where Kickbacks is installed
ls -la ~/.antigravity-ide/extensions/kickbacksai.kickbacks-ai-*/

# Antigravity processes running
ps aux | grep -i antigravity | grep -v grep

Extension Host Process

In Antigravity IDE, the extension host's process.execPath is:

/Applications/Antigravity IDE.app/Contents/Frameworks/Antigravity IDE Helper (Plugin).app/Contents/MacOS/Antigravity IDE Helper (Plugin)

It contains "antigravity" (case-insensitive) → the detection works.

Links

• antigravity-ide — Google Antigravity IDE
• fitalabs-infra — Local Docker services
• CLI Tools — historical reference with no active canonical page