Antigravity - Mem0 — ContextQMD

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

A Mem0 API key (starts with m0-):
- <a href="https://app.mem0.ai/dashboard/api-keys?utm_source=oss&utm_medium=integration-antigravity" rel="nofollow">Get your API key</a> (free sign-up at <a href="https://app.mem0.ai?utm_source=oss&utm_medium=integration-antigravity" rel="nofollow">app.mem0.ai</a>)
Add it to your shell profile so it persists across sessions:

<CodeGroup> ```bash zsh echo 'export MEM0_API_KEY="m0-your-api-key"' >> ~/.zshrc && source ~/.zshrc ```

bash

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

</CodeGroup>

Installation

Option A: degit (recommended):

bash

# 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 when the session ends

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

<CardGroup cols={2}> <Card title="Mem0 MCP Setup" icon="puzzle-piece" href="/platform/mem0-mcp"> Detailed MCP configuration for all clients </Card> <Card title="OpenCode Integration" icon="code" href="/integrations/opencode"> Add Mem0 memory to OpenCode workflows </Card> </CardGroup>