Claude.ai

Add persistent memory to Claude.ai (the hosted web app, not Claude Code) using Mem0’s remote MCP server. Claude.ai connects to MCP servers over the internet as custom connectors; there is no local plugin or hook system here, since chats run in Anthropic’s cloud, not on your machine.

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Prerequisites

1. A Mem0 Platform account: sign up at app.mem0.ai
2. A Claude.ai account on any plan (free, Pro, Max, Team, or Enterprise)

You don’t need an API key up front: the connector uses browser-based sign-in the first time Claude calls a Mem0 tool (see Signing in).

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Installation

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Individual accounts (Pro, Max, or free)

1. Go to Customize > Connectors
2. Click +, then Add custom connector
3. Enter the server URL: https://mcp.mem0.ai/mcp/
4. Click Add

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Team and Enterprise organizations

An organization owner registers the connector once for everyone:

1. Go to Organization Settings > Connectors
2. Click Add, hover Custom, then select Web
3. Enter the server URL: https://mcp.mem0.ai/mcp/
4. Click Add

Members then connect individually: Customize > Connectors, find mem0, and click Connect.

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Enabling in a chat

Connectors are opt-in per conversation. Click the + button next to the chat prompt, open Connectors, and toggle mem0 on before you start.

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Signing in

The first time Claude calls a Mem0 tool, your browser opens a sign-in prompt to authorize the connector against your Mem0 account. Approve it once; Claude.ai stores and refreshes the resulting token for you. There’s no API key to paste into the connector UI itself.

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What’s Included

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Available MCP Tools

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Troubleshooting

• Claude never calls the mem0 tools, even though the connector shows as connected: Claude.ai ships its own native memory (Settings > Capabilities > Memory, on by default), which synthesizes a running summary from your chat history automatically. When both are active, Claude’s system prompt tends to favor its built-in memory and rarely reaches for a third-party memory tool on its own. Ask explicitly (“search my mem0 memories for…”, “save this to mem0”) to force the tool call, or pause Claude’s native memory (Settings > Capabilities > Memory > Pause) if you want Mem0 to be the primary memory store for that account.
• “Connection failed” or the connector won’t add: Confirm the URL is exactly https://mcp.mem0.ai/mcp/. Custom connectors reach your MCP server from Anthropic’s cloud, not your device, so a localhost URL will never work here.
• No tools appearing after adding the connector: Make sure you toggled mem0 on for the current conversation under the + > Connectors menu; adding a connector doesn’t enable it in every chat automatically.
• Can’t add a second connector: Free-tier accounts are capped at one custom connector; upgrade to Pro/Max/Team/Enterprise for more.