Add Google Antigravity provider support

README.md

@@ -400,6 +400,7 @@ Full detector docs: [impeccable.style/docs/detector](https://impeccable.style/do
 - [Rovo Dev](https://www.atlassian.com/software/rovo)
 - [Qoder](https://qoder.com)
 - [Mistral Vibe](https://docs.mistral.ai/vibe/code/overview)
+- [Google Antigravity](https://antigravity.google)
 
 ## Community & Ecosystem
 

cli/bin/commands/skills.mjs

@@ -23,9 +23,11 @@ const __dirname = dirname(fileURLToPath(import.meta.url));
 const API_BASE = 'https://impeccable.style';
 
 // Provider folder names in project roots
-const PROVIDER_DIRS = ['.claude', '.cursor', '.gemini', '.agents', '.github', '.grok', '.kiro', '.opencode', '.pi', '.qoder', '.trae', '.trae-cn', '.rovodev', '.vibe'];
+const PROVIDER_DIRS = ['.claude', '.cursor', '.gemini', '.agents', '.agent', '.github', '.grok', '.kiro', '.opencode', '.pi', '.qoder', '.trae', '.trae-cn', '.rovodev', '.vibe'];
 const PROVIDER_ALIASES = {
+  agent: '.agent',
   agents: '.agents',
+  antigravity: '.agent',
   claude: '.claude',
   'claude-code': '.claude',
   codex: '.agents',
@@ -48,6 +50,7 @@ const PROVIDER_ALIASES = {
 };
 
 const PROVIDER_DISPLAY = {
+  '.agent': { name: 'Antigravity', input: 'antigravity' },
   '.agents': { name: 'Codex CLI', input: 'codex' },
   '.claude': { name: 'Claude Code', input: 'claude' },
   '.cursor': { name: 'Cursor', input: 'cursor' },
@@ -63,7 +66,7 @@ const PROVIDER_DISPLAY = {
   '.trae-cn': { name: 'Trae CN', input: 'trae-cn' },
   '.vibe': { name: 'Mistral Vibe', input: 'vibe' },
 };
-const PROVIDER_INPUT_ORDER = ['claude', 'codex', 'cursor', 'gemini', 'github', 'grok', 'kiro', 'opencode', 'pi', 'qoder', 'trae', 'trae-cn', 'rovo-dev', 'vibe'];
+const PROVIDER_INPUT_ORDER = ['antigravity', 'claude', 'codex', 'cursor', 'gemini', 'github', 'grok', 'kiro', 'opencode', 'pi', 'qoder', 'trae', 'trae-cn', 'rovo-dev', 'vibe'];
 
 // OpenCode reads global skills from its config directory, not ~/.opencode:
 // $OPENCODE_CONFIG_DIR, else $XDG_CONFIG_HOME/opencode, else
@@ -88,6 +91,7 @@ const HOME_SKILLS_DIR_OVERRIDES = {
 // installed harnesses (~/.claude, ~/.codex, ...). Codex reads skills from
 // .agents/skills, so ~/.codex maps to the .agents bundle variant.
 const GLOBAL_HARNESS_HINTS = [
+  { home: '.agent', provider: '.agent' },
   { home: '.claude', provider: '.claude' },
   { home: '.codex', provider: '.agents' },
   { home: '.cursor', provider: '.cursor' },
@@ -598,7 +602,7 @@ async function copyOrExtractLocalBundle(sourceValue) {
  */
 function normalizeForHash(content) {
   return content
-    .replace(/\.(claude|cursor|agents|github|gemini|codex|grok|kiro|opencode|pi|qoder|trae|trae-cn|rovodev|vibe)\/skills\//g, '.PROVIDER/skills/');
+    .replace(/\.(claude|cursor|agents|agent|github|gemini|codex|grok|kiro|opencode|pi|qoder|trae|trae-cn|rovodev|vibe)\/skills\//g, '.PROVIDER/skills/');
 }
 
 function hashSkillFile(filePath) {

cli/lib/download-providers.js

@@ -4,6 +4,7 @@ export const FILE_DOWNLOAD_PROVIDER_CONFIG_DIRS = Object.freeze({
   gemini: '.gemini',
   codex: '.codex',
   agents: '.agents',
+  antigravity: '.agent',
   github: '.github',
   grok: '.grok',
   kiro: '.kiro',

docs/HARNESSES.md

@@ -26,6 +26,7 @@ Last verified: 2026-04-28 (subagent landscape spot-checked 2026-06-28; Mistral V
 | Rovo Dev | https://support.atlassian.com/rovo/docs/extend-rovo-dev-cli-with-agent-skills |
 | Mistral Vibe | https://docs.mistral.ai/vibe/code/cli/skills |
 | Grok Build | https://docs.x.ai/build/features/skills-plugins-marketplaces |
+| Antigravity | https://antigravity.google/docs/skills |
 
 ## Spec Compliance
 
@@ -37,22 +38,22 @@ Provider-specific extensions beyond the spec: `user-invocable`, `argument-hint`,
 
 Fields marked with * are spec-standard. Others are provider extensions.
 
-| Field | Claude Code | Cursor | Gemini | Codex | Copilot | Grok | Kiro | OpenCode | Pi | Qoder | Rovo Dev | Mistral Vibe |
-|-------|:-----------:|:------:|:------:|:-----:|:-------:|:----:|:----:|:--------:|:--:|:-----:|:--------:|:------------:|
-| `name`* | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
-| `description`* | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
-| `license`* | Yes | Yes | Ignored | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
-| `compatibility`* | Yes | Yes | Ignored | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
-| `metadata`* | Yes | Yes | Ignored | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
-| `allowed-tools`* | Yes | No | Ignored | No | No | Yes | No | Yes | Yes | Yes | Yes | Yes |
-| `user-invocable` | Yes | No | No | No | Yes | Yes | No | Yes | No | Yes | Yes | Yes |
-| `argument-hint` | Yes | No | No | No | Yes | Yes | No | Yes | No | Yes | Yes | No |
-| `disable-model-invocation` | Yes | Yes | No | No | Yes | Yes | No | Yes | Yes | TBD | TBD | No |
-| `model` | Yes | No | No | No | No | Yes | No | Yes | No | No | No | No |
-| `effort` | Yes | No | No | No | No | Yes | No | No | No | No | No | No |
-| `context` | Yes | No | No | No | No | No | No | No | No | No | No | No |
-| `agent` | Yes | No | No | No | No | No | No | Yes | No | No | No | No |
-| `hooks` | Yes | No | No | Yes | No | Yes | No | No | No | No | No | No |
+| Field | Claude Code | Cursor | Gemini | Codex | Copilot | Grok | Kiro | OpenCode | Pi | Qoder | Rovo Dev | Mistral Vibe | Antigravity |
+|-------|:-----------:|:------:|:------:|:-----:|:-------:|:----:|:----:|:--------:|:--:|:-----:|:--------:|:------------:|:-----------:|
+| `name`* | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
+| `description`* | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
+| `license`* | Yes | Yes | Ignored | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
+| `compatibility`* | Yes | Yes | Ignored | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
+| `metadata`* | Yes | Yes | Ignored | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
+| `allowed-tools`* | Yes | No | Ignored | No | No | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes |
+| `user-invocable` | Yes | No | No | No | Yes | Yes | No | Yes | No | Yes | Yes | Yes | No |
+| `argument-hint` | Yes | No | No | No | Yes | Yes | No | Yes | No | Yes | Yes | No | No |
+| `disable-model-invocation` | Yes | Yes | No | No | Yes | Yes | No | Yes | Yes | TBD | TBD | No | No |
+| `model` | Yes | No | No | No | No | Yes | No | Yes | No | No | No | No | No |
+| `effort` | Yes | No | No | No | No | Yes | No | No | No | No | No | No | No |
+| `context` | Yes | No | No | No | No | No | No | No | No | No | No | No | No |
+| `agent` | Yes | No | No | No | No | No | No | Yes | No | No | No | No | No |
+| `hooks` | Yes | No | No | Yes | No | Yes | No | No | No | No | No | No | No |
 
 Notes:
 - Gemini CLI validates only `name` and `description`; other spec fields are parsed but ignored.
@@ -60,6 +61,7 @@ Notes:
 - Codex CLI hooks ship under `[features].hooks = true` (still flagged), require `/hooks` trust ceremony per-update, and are disabled on Windows.
 - Grok Build is Claude Code compatible with zero config: it also reads `.claude/skills/`, `.claude/settings.json` hooks, and Claude plugin layouts. Native paths are `.grok/skills/`, `.grok/hooks/*.json`, and `.grok/agents/`. Skill frontmatter supports `when-to-use` in addition to the fields above. Project hooks require `/hooks-trust` (or `--trust`). See https://docs.x.ai/build/features/skills-plugins-marketplaces and https://docs.x.ai/build/features/hooks.
 - Kiro recognizes `user-invocable` and `disable-model-invocation` per community reports but does not formally document them.
+- Antigravity supports standard Agent Skills spec frontmatter fields (`name`, `description`, `license`, `compatibility`, `metadata`, `allowed-tools`).
 - Unknown fields are silently ignored by all harnesses.
 
 ## Hook surface used by Impeccable
@@ -90,6 +92,7 @@ Notes:
 | Rovo Dev | `.rovodev/skills/` | `~/.rovodev/skills/` (user-level) |
 | Mistral Vibe | `.vibe/skills/` (project), `~/.vibe/skills/` (global) | `.agents/skills/` (project), `~/.agents/skills/` (global) |
 | Grok Build | `.grok/skills/` (project), `~/.grok/skills/` (global) | `.agents/skills/`, `.claude/skills/`, `.cursor/skills/` (Claude/Cursor compat, configurable) |
+| Antigravity | `.agent/skills/` | `.agents/skills/` |
 
 All harnesses support the `{skill-name}/SKILL.md` directory structure with optional `reference/`, `scripts/`, and `assets/` subdirectories.
 

scripts/build.js

@@ -466,6 +466,7 @@ This folder contains skills for all supported tools:
   .gemini/    -> Gemini CLI
   .codex/     -> Codex custom agents (Codex skills use .agents/)
   .agents/    -> Codex CLI
+  .agent/     -> Antigravity
   .github/    -> GitHub Copilot
   .grok/      -> Grok Build
   .kiro/      -> Kiro

scripts/lib/transformers/index.js

@@ -17,5 +17,6 @@ export const transformQoder = createTransformer(PROVIDERS.qoder);
 export const transformRovoDev = createTransformer(PROVIDERS['rovo-dev']);
 export const transformVibe = createTransformer(PROVIDERS.vibe);
 export const transformGrok = createTransformer(PROVIDERS.grok);
+export const transformAntigravity = createTransformer(PROVIDERS.antigravity);
 
 export { createTransformer, PROVIDERS };

scripts/lib/transformers/providers.js

@@ -155,4 +155,11 @@ export const PROVIDERS = {
     // settings.json). Claude tool-name matchers alias to Grok tools.
     hooksManifestRel: 'hooks/impeccable.json',
   },
+  antigravity: {
+    provider: 'antigravity',
+    providerTags: ['antigravity'],
+    configDir: '.agent',
+    displayName: 'Antigravity',
+    frontmatterFields: ['license', 'compatibility', 'metadata', 'allowed-tools'],
+  },
 };

scripts/lib/utils.js

@@ -639,11 +639,18 @@ export const PROVIDER_PLACEHOLDERS = {
     config_file: 'AGENTS.md',
     ask_instruction: 'STOP and call the AskUserQuestion tool to clarify.',
     command_prefix: '/'
+  },
+  'antigravity': {
+    model: 'Gemini',
+    config_file: 'AGENTS.md',
+    ask_instruction: 'ask the user directly to clarify what you cannot infer.',
+    command_prefix: '/'
   }
 };
 
 export const PROVIDER_BLOCK_TAGS = new Set([
   'agents',
+  'antigravity',
   'claude',
   'claude-code',
   'codex',

skill/scripts/pin.mjs

@@ -21,7 +21,7 @@ const __dirname = dirname(fileURLToPath(import.meta.url));
 
 // All known harness directories
 const HARNESS_DIRS = [
-  '.claude', '.cursor', '.gemini', '.codex', '.agents', '.github', '.grok',
+  '.claude', '.cursor', '.gemini', '.codex', '.agents', '.agent', '.github', '.grok',
   '.trae', '.trae-cn', '.pi', '.opencode', '.kiro', '.rovodev', '.vibe', '.qoder',
 ];