mem9 MCP Server
Provides memory management tools for OpenAI Codex, enabling AI agents to store, search, retrieve, update, and delete memories via the mem9 memory service.
Click on "Install Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type
@followed by the MCP server name and your instructions, e.g., "@mem9 MCP Serverremember that my favorite color is blue and I like hiking"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
@mem9/mcp-server
Universal MCP Server for mem9 memory service. One server, all platforms.
Quick Start
# Requires a running mnemo-server and API key
git clone https://github.com/you06/mem9-mcp.git
cd mem9-mcp
npm installEnvironment Variables
Variable | Required | Default | Description |
| Yes | - | API key for authentication (also serves as tenant ID) |
| No |
| mnemo-server base URL |
| No | auto-detected | Agent identifier |
| No |
| Log level: debug, info, warn, error |
| No |
| HTTP request timeout (ms) |
| No |
| Default search result limit |
Agent ID is auto-detected from platform environment variables (CURSOR_WORKSPACE, CLAUDE_CODE_VERSION, CODEX_CLI_VERSION).
Related MCP server: Mem0 MCP Server
Tools
Tool | Description |
| Store a new memory (processed via fact extraction) |
| Search memories by semantic similarity and keywords |
| Retrieve a specific memory by ID |
| Update an existing memory (direct field update) |
| Delete a memory |
Development
npm install
npm run build
npm testLocal Testing with Claude Code / Codex
Before publishing, you can test the MCP server locally by pointing to the built entry file:
Claude Code:
claude mcp add mem9 -e MEM9_API_KEY=your-key -e MEM9_API_URL=http://localhost:8080 -- node /path/to/mem9-mcp/dist/index.jsOr in .mcp.json:
{
"mcpServers": {
"mem9": {
"command": "node",
"args": ["/path/to/mem9-mcp/dist/index.js"],
"env": {
"MEM9_API_URL": "http://localhost:8080",
"MEM9_API_KEY": "your-key"
}
}
}
}Codex:
codex mcp add mem9 -- node /path/to/mem9-mcp/dist/index.jsOr in .codex/config.toml:
[mcp_servers.mem9]
command = "node"
args = ["/path/to/mem9-mcp/dist/index.js"]
[mcp_servers.mem9.env]
MEM9_API_URL = "http://localhost:8080"
MEM9_API_KEY = "your-key"After code changes, run npm run build and restart the MCP client to pick up the new build.
Platform Setup
Cursor
Settings > Features > MCP Servers:
{
"mcpServers": {
"mem9": {
"command": "npx",
"args": ["-y", "@mem9/mcp-server"],
"env": {
"MEM9_API_URL": "http://localhost:8080",
"MEM9_API_KEY": "your-key"
}
}
}
}Claude Code
claude mcp add mem9 -- npx -y @mem9/mcp-serverOr in .mcp.json:
{
"mcpServers": {
"mem9": {
"command": "npx",
"args": ["-y", "@mem9/mcp-server"],
"env": {
"MEM9_API_URL": "http://localhost:8080",
"MEM9_API_KEY": "your-key"
}
}
}
}OpenAI Codex
codex mcp add mem9 -- npx -y @mem9/mcp-serverOr in .codex/config.toml:
[mcp_servers.mem9]
command = "npx"
args = ["-y", "@mem9/mcp-server"]
[mcp_servers.mem9.env]
MEM9_API_URL = "http://localhost:8080"
MEM9_API_KEY = "your-key"License
Apache-2.0
This server cannot be installed
Maintenance
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