---
title: Claude Code
description: "Add persistent memory to Claude Code and Claude Cowork with the Mem0 plugin — MCP server, lifecycle hooks, and SDK skill."
---

Add persistent memory to [**Claude Code**](https://docs.anthropic.com/en/docs/claude-code) (CLI) and **Claude Cowork** (desktop app) with the Mem0 plugin. Your agent forgets everything between sessions — this plugin fixes that by connecting to Mem0's cloud memory layer via MCP, automatically capturing learnings at key lifecycle points, and retrieving relevant context before every response.

## Overview

1. **MCP Server** — Connect to Mem0's remote MCP server for memory tools (add, search, update, delete)
2. **Lifecycle Hooks** — Automatic memory capture at session start, context compaction, task completion, and session end
3. **SDK Skill** — Teaches the agent how to integrate the Mem0 SDK into your applications
4. **Zero local dependencies** — Cloud-hosted MCP server, no local setup required

## Prerequisites

Before setting up Mem0 with Claude Code, ensure you have:

1. A Mem0 Platform account and API key:
   - <a href="https://app.mem0.ai?utm_source=oss&utm_medium=integration-claude-code" rel="nofollow">Sign up at app.mem0.ai</a>
   - <a href="https://app.mem0.ai/dashboard/api-keys?utm_source=oss&utm_medium=integration-claude-code" rel="nofollow">Get your API key</a> (starts with `m0-`)

2. Claude Code CLI or Claude Cowork desktop app installed

3. Your API key exported in your shell:

```bash
export MEM0_API_KEY="m0-your-api-key"
```

## Installation

### Option A — Plugin Marketplace (Recommended)

Install the full plugin including MCP server, lifecycle hooks, and SDK skill.

1. Add the Mem0 marketplace:

   ```
   /plugin marketplace add mem0ai/mem0
   ```

2. Install the plugin:

   ```
   /plugin install mem0@mem0-plugins
   ```

**Claude Cowork desktop app:** Open the Cowork tab, click **Customize** in the sidebar, click **Browse plugins**, and install Mem0.

### Option B — MCP Only

Add the Mem0 MCP server directly with a single command:

```bash
npx mcp-add \
  --name mem0-mcp \
  --type http \
  --url "https://mcp.mem0.ai/mcp" \
  --clients "claude code"
```

This gives you the MCP tools but not the lifecycle hooks or SDK skill.

### Option C — Manual MCP Configuration

Add to your Claude Code MCP config (`.mcp.json`):

```json
{
  "mcpServers": {
    "mem0": {
      "type": "http",
      "url": "https://mcp.mem0.ai/mcp/",
      "headers": {
        "Authorization": "Token ${MEM0_API_KEY}"
      }
    }
  }
}
```

<Info icon="check">
  Start a new session and ask: *"List my mem0 entities"* or *"Search my memories for hello"*. If the `mem0` tools appear and respond, you're all set.
</Info>

## What's Included

| Component | Plugin Install | MCP Only |
|-----------|:--------------:|:--------:|
| MCP Server (9 memory tools) | Yes | Yes |
| Lifecycle Hooks | Yes | No |
| Mem0 SDK Skill | Yes | No |

## Available MCP Tools

Once installed, the following tools are available in every Claude Code session:

| 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

When installed via the plugin marketplace, Mem0 hooks into Claude Code's lifecycle to automatically manage memory:

### Session Start
On every new session, the plugin prompts Claude to call `search_memories` to load relevant context from prior sessions. On resumed or post-compaction sessions, it adjusts the prompt accordingly.

### User Prompt
Before processing each user message, the plugin searches Mem0 for memories relevant to the current prompt and injects them into context. Short prompts (< 20 characters) are skipped to minimize latency.

### Pre-Compaction
Before context compaction, the plugin prompts Claude to store a comprehensive session summary — including goals, accomplishments, decisions, modified files, and current state — so nothing is lost.

### Task Completed
After each task completion, the plugin prompts Claude to extract and store key learnings: successful strategies, failed approaches, architectural decisions, and new conventions.

### Session End
When Claude finishes responding, the plugin prompts for any unstored learnings and captures transcript state via the Mem0 REST API as a background safety net.

## Example Workflow

```text
# Session 1: Working on a feature
You: Let's refactor the auth module to use JWT tokens instead of sessions.

# Claude searches memories, finds nothing relevant, proceeds with the work.
# After completing the task, Mem0 stores:
#   - Decision: "Migrated auth from sessions to JWT tokens"
#   - Files modified: auth/middleware.ts, auth/token.ts
#   - User preference: "Prefers TypeScript, uses ESLint"

# Session 2 (days later): Related work
You: Add refresh token rotation to the auth system.

# Claude searches memories, retrieves the JWT migration context.
# Knows the file structure, decisions made, and user preferences.
# Continues seamlessly without re-explaining the codebase.
```

## Troubleshooting

- **"Connection failed"** — Verify `MEM0_API_KEY` is set in your shell: `echo $MEM0_API_KEY`
- **No tools appearing** — Restart your Claude Code session after installation
- **Memories not being captured** — Ensure you installed via the plugin marketplace (Option A) for lifecycle hooks. MCP-only installs require manual memory operations.

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