# How to Install Google Skills for Antigravity CLI: A Complete Guide > Easily install Google Skills for Antigravity CLI. Follow our complete guide to run agy plugin install with the repository URL for seamless integration. - Repository: [Google/skills](https://github.com/google/skills) - Tags: how-to-guide - Published: 2026-09-02 --- **You install Google Skills for the Antigravity CLI by running `agy plugin install` followed by the direct repository URL to the specific plugin submodule, such as `agy plugin install https://github.com/google/skills/plugins/cloud/data-agent-kit/alloydb`.** The `google/skills` repository hosts a centralized collection of Markdown-based skills and optional MCP (Model Context Protocol) servers that extend the Antigravity CLI (`agy`) with product-specific commands. Unlike marketplace-driven assistants, Antigravity pulls plugins directly from Git submodules, allowing you to install only the capabilities you need without downloading the entire repository. ## Understanding the Antigravity Plugin Architecture The Antigravity CLI (`agy`) does **not** use a centralized marketplace manifest like Claude Code or Codex. Instead, it clones plugin code directly from repository URLs. When you execute `agy plugin install`, the CLI: 1. Clones the requested submodule path (e.g., `plugins/cloud/data-agent-kit/alloydb`) 2. Reads the [`plugin.json`](https://github.com/google/skills/blob/main/plugin.json) metadata file located at the root of that plugin directory 3. Registers the skill definitions and MCP configurations for the current session This architecture is defined in the repository's `.gitmodules` file, which maps each plugin to a specific commit tag for deterministic versioning. ## Prerequisites Before installing Google Skills, ensure you have the Antigravity CLI installed and accessible via the `agy` command. Optionally, to browse the full skill catalog locally, install the top-level skills package: ```bash npx skills add google/skills ``` This command pulls the repository's main README and plugin index, though it is not required to run individual skill commands. ## Installing Individual Google Skill Plugins To add a specific capability—such as database management or cloud resource orchestration—you install plugins individually by targeting their submodule path. ### Installing the AlloyDB Plugin The AlloyDB plugin provides commands for managing AlloyDB clusters and instances. To install it from the `google/skills` repository: ```bash agy plugin install https://github.com/google/skills/plugins/cloud/data-agent-kit/alloydb ``` After installation, verify the plugin loads correctly: ```bash agy list # Confirms 'alloydb' appears in installed plugins agy help alloydb # Displays available AlloyDB-specific commands ``` ### Installing the Spanner Plugin Similarly, install the Cloud Spanner plugin to enable SQL query execution and schema management: ```bash agy plugin install https://github.com/google/skills/plugins/cloud/data-agent-kit/spanner ``` Once registered, you can execute Spanner commands directly: ```bash agy spanner query "SELECT * FROM my_database.my_table LIMIT 10" ``` ### Available Plugin Paths Each plugin resides under `plugins/cloud/data-agent-kit//` within the repository. The [`plugin.json`](https://github.com/google/skills/blob/main/plugin.json) file inside each directory defines the plugin's entry points and version metadata consumed by Antigravity. ## Verifying Plugin Installation After running the install command, Antigravity immediately makes the skill available in your current session. Validate the installation by listing registered plugins or invoking help for the specific skill: ```bash # List all active plugins agy list # Get help for a specific Google Skill agy help spanner ``` ## Updating and Managing Plugins Because Antigravity treats each plugin as an isolated repository path, you control versions through Git submodules. To upgrade a plugin: 1. Check the `.gitmodules` file in the `google/skills` repository to identify the latest tagged version 2. Re-run the `agy plugin install` command with the updated URL or tag This submodule-based approach ensures that `agy` always pulls the exact code specified in the central repository, preventing version drift across your CLI environment. ## Summary - **Direct URL installation**: Antigravity installs Google Skills via `agy plugin install ` rather than a package manager or marketplace. - **Submodule structure**: Plugins are stored under `plugins/cloud/data-agent-kit//` and tracked as Git submodules in `.gitmodules`. - **Metadata discovery**: Each plugin contains a [`plugin.json`](https://github.com/google/skills/blob/main/plugin.json) that Antigravity reads to register commands and MCP servers. - **Granular control**: Install only the plugins you need (e.g., AlloyDB, Spanner) without cloning the entire `google/skills` repository. - **Immediate availability**: Skills are active immediately after installation and persist for the current CLI session. ## Frequently Asked Questions ### Do I need to clone the entire google/skills repository to use a plugin? No. The Antigravity CLI clones only the specific submodule path you provide in the `agy plugin install` command. You do not need to manually clone the repository or download the full skill catalog to use individual plugins. ### Where does Antigravity find the command definitions for a skill? Antigravity reads the [`plugin.json`](https://github.com/google/skills/blob/main/plugin.json) file located at the root of each plugin directory (e.g., [`plugins/cloud/data-agent-kit/alloydb/plugin.json`](https://github.com/google/skills/blob/main/plugins/cloud/data-agent-kit/alloydb/plugin.json)). This JSON file defines the plugin name, version, entry points, and available commands that the CLI registers. ### How do I upgrade an installed Google Skill to the latest version? Upgrade a plugin by re-running the `agy plugin install` command with the updated URL or tag. The `google/skills` repository uses Git submodules (defined in `.gitmodules`) to pin plugins to specific versions, so updating your local reference and reinstalling pulls the latest code. ### Can I use Google Skills without the Antigravity CLI? The `google/skills` repository also supports the `npx skills add` command for browsing documentation, but the interactive commands and MCP integrations require the Antigravity CLI (`agy`). The skills are designed specifically to extend the `agy` command set with product-aware operations.