Antigravity

Add persistent memory to Google Antigravity with the Mem0 plugin: MCP server, lifecycle hooks, and slash commands.

Add persistent memory to Google Antigravity (agy CLI and Desktop IDE) with the Mem0 plugin. Your agent forgets everything between sessions. Mem0 fixes that by storing decisions, preferences, and learnings so they carry over automatically.

Prerequisites

1. A Mem0 API key (starts with m0-):

   • Get your API key (free sign-up at app.mem0.ai)

2. Add it to your shell profile so it persists across sessions:

zsh

echo 'export MEM0_API_KEY="m0-your-api-key"' >> ~/.zshrc && source ~/.zshrc

echo 'export MEM0_API_KEY="m0-your-api-key"' >> ~/.bashrc && source ~/.bashrc

Installation

Option A: degit (recommended):

# Install the plugin (MCP server, hooks, scripts)
npx degit mem0ai/mem0/integrations/mem0-plugin ~/.gemini/config/plugins/mem0

This installs the MCP server, lifecycle hooks, and shared scripts.

What’s Included

Component	Included
MCP Server (9 memory tools)	Yes
Lifecycle Hooks	Yes
16 Slash Commands	Yes

Available MCP Tools

Tool	Description
add_memory	Save text or conversation history for a user/agent
search_memories	Semantic search across memories with filters
get_memories	List memories with filters and pagination
get_memory	Retrieve a specific memory by ID
update_memory	Overwrite a memory’s text by ID
delete_memory	Delete a single memory by ID
delete_all_memories	Bulk delete all memories in scope
delete_entities	Delete a user/agent/app/run entity and its memories
list_entities	List users/agents/apps/runs stored in Mem0

Lifecycle Hooks

The plugin uses the same shell scripts as Claude Code, Cursor, and Codex: hooks bridge environment variables using ${extensionPath} (Antigravity’s plugin-root token).

Hook	Event	What it does
Session start	SessionStart	Loads prior memories and displays status banner
User prompt	UserPromptSubmit	Searches relevant memories before each message
Pre-tool	PreToolUse	Blocks MEMORY.md writes, enforces user_id/app_id on mem0 tools
Post-tool	PostToolUse	Tracks stats, scans bash errors for related memories
Stop	Stop	Stores a session summary at the end of every assistant turn (not just at session end)

What you type is stored as yours. What the agent produces — session summaries and compaction summaries — is stored as the assistant’s, so its suggestions never become your stated preferences.

Troubleshooting

• No tools appearing: Restart your Antigravity session after installation
• “Connection failed”: Verify your key is set: echo $MEM0_API_KEY
• MCP 401 Unauthorized: If ${MEM0_API_KEY} interpolation doesn’t work in your agy version, replace with your literal key in mcp_config.json

Mem0 MCP Setup

Detailed MCP configuration for all clients

OpenCode Integration

Add Mem0 memory to OpenCode workflows

Using Mem0? Star us on GitHub to help more developers discover memory for AI apps.