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Add persistent memory to Cursor with the Mem0 plugin. Your AI assistant 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.

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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, compaction, and user prompts (Marketplace install)
  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

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Prerequisites

Before setting up Mem0 with Cursor, ensure you have:
  1. A Mem0 Platform account and API key:
  2. Cursor installed (cursor.com)
  3. Your API key exported in your shell: 
export MEM0_API_KEY="m0-your-api-key"
Already have mem0 configured as an MCP server in Cursor? Remove the existing entry from your Cursor MCP settings before installing to avoid duplicate tools.

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Installation

The fastest way to get started. Click the link below to install the Mem0 MCP server directly in Cursor: Install Mem0 MCP in Cursor

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Option B — npx (MCP Only)

npx mcp-add \
  --name mem0-mcp \
  --type http \
  --url "https://mcp.mem0.ai/mcp" \
  --clients "cursor"

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Option C — Manual Configuration (MCP Only)

Add the following to your .cursor/mcp.json: 
{
  "mcpServers": {
    "mem0": {
      "url": "https://mcp.mem0.ai/mcp/",
      "headers": {
        "Authorization": "Token ${env:MEM0_API_KEY}"
      }
    }
  }
}

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Option D — Cursor Marketplace (Full Plugin)

Install from the Cursor Marketplace for the complete experience including lifecycle hooks, the Mem0 SDK skill, and automatic memory capture.
Start a new Cursor session and ask: “List my mem0 entities” or “Search my memories for hello”. If the mem0 tools appear and respond, you’re all set.

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What’s Included

ComponentMarketplace InstallDeeplink / Manual / npx
MCP Server (9 memory tools)YesYes
Lifecycle HooksYesNo
Mem0 SDK SkillYesNo

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Available MCP Tools

Once installed, the following tools are available in every Cursor session:
ToolDescription
add_memorySave text or conversation history for a user/agent
search_memoriesSemantic search across memories with filters
get_memoriesList memories with filters and pagination
get_memoryRetrieve a specific memory by ID
update_memoryOverwrite a memory’s text by ID
delete_memoryDelete a single memory by ID
delete_all_memoriesBulk delete all memories in scope
delete_entitiesDelete a user/agent/app/run entity and its memories
list_entitiesList users/agents/apps/runs stored in Mem0

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Lifecycle Hooks (Marketplace Install)

When installed via the Cursor Marketplace, Mem0 hooks into Cursor’s lifecycle:

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Session Start

On every new session, the plugin prompts the agent to call search_memories to load relevant context from prior sessions.

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User Prompt

Before processing each user message, the plugin searches Mem0 for relevant memories and injects them into context. Short prompts are skipped to minimize latency.

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Pre-Compaction

Before context compaction, the plugin captures a comprehensive session summary so nothing is lost when the context window resets.

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Example Workflow

# Session 1: Debugging a performance issue
You: The API endpoint /users is taking 3 seconds. Help me optimize it.

# Cursor agent searches memories, proceeds with investigation.
# After completing the task, Mem0 stores:
#   - Learning: "N+1 query in UserService.getAll() — fixed with eager loading"
#   - Decision: "Added database index on users.email column"
#   - Preference: "User prefers query-level fixes over caching"

# Session 2 (next week): Similar issue
You: The /orders endpoint is also slow, same pattern as before.

# Agent searches memories, retrieves the optimization learnings.
# Immediately checks for N+1 queries and missing indexes.

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Troubleshooting

  • “Connection failed” — Verify MEM0_API_KEY is set: echo $MEM0_API_KEY
  • Duplicate tools — If you had a previous MCP config for mem0, remove it before installing the plugin
  • No tools appearing — Go to Cursor Settings > MCP and verify the mem0 server shows as connected
  • Hooks not running — Hooks require the Marketplace install (Option D). Deeplink/manual installs only provide MCP tools.

Mem0 MCP Setup

Detailed MCP configuration for all clients

Claude Code Integration

Add Mem0 memory to Claude Code workflows