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Connect and use Exomem

Exomem Cloud documentation

Exomem is a knowledge base that your AI assistants share. Your assistant uses it to find what you decided, the sources behind each decision, and what changed since. It can also save new conclusions, sources and evidence, so that your next conversation starts from them. Substrate Systems OÜ runs Exomem Cloud.

This page tells you how to connect Exomem Cloud to your assistant, what Exomem can read and change, and how to stop.

Before you connect

  • You need an Exomem account. Start on the Exomem page with your email. Exomem Cloud is a monthly subscription.
  • You need no API key. When you connect, your app opens an Exomem sign-in page, and you approve the connection there.
  • Your app must support remote MCP servers with OAuth sign-in.
  • On a company workspace, such as Claude Team or Enterprise, an owner or admin may need to allow Exomem first.

The Exomem address is https://exomem.substratesystems.io/mcp. It is the same for every account.

Connect Claude

These steps cover Claude on the web, Claude Desktop and Cowork. A connector that you add on the web also appears in the Claude mobile apps.

  1. In Claude, open “Settings”, then “Connectors”.
  2. If Exomem is in the list, select it.
  3. If Exomem is not in the list, select “Add custom connector”, and paste https://exomem.substratesystems.io/mcp.
  4. Select “Connect”.
  5. Sign in to Exomem with your email, and approve the connection.

Claude now shows Exomem as connected, and you can use it in any conversation.

Connect Claude Code

The Exomem plugin adds the connection, the Exomem skills, and hooks that suggest when to search or save. The hooks run on your device and need Python 3 (python3).

  1. Run /plugin marketplace add Artexis10/exomem.
  2. Run /plugin install exomem-cloud@exomem.
  3. Run /mcp, select Exomem, and sign in.

/mcp now shows Exomem as connected.

Connect ChatGPT

  1. Open Exomem in the ChatGPT plugin directory.
  2. Select “Connect”.
  3. Sign in to Exomem with your email, and approve the connection.

ChatGPT now shows Exomem as connected. Codex uses the same plugin from its directory.

Connect another app

Any app that supports remote MCP servers with OAuth sign-in can use Exomem.

  1. Open the connector or MCP server settings of your app.
  2. Add a remote server with https://exomem.substratesystems.io/mcp.
  3. Sign in to Exomem with your email, and approve the connection.
  4. On Home, find “Add another app”, and select “Set up”.
  5. Pick how much the app joins in, and select “Copy”.
  6. Paste the text into the instructions of your app, or into its rules file, such as AGENTS.md.

Your app now uses Exomem. The instructions tell it when to search Exomem and when to save to it.

What Exomem reads and changes

  • Reads: Exomem searches and reads your own knowledge base, and returns the notes and sources that answer the question.
  • Receives: when your assistant searches, it sends your question and short parts of the conversation. Exomem keeps only what is saved or imported.
  • Changes: Exomem saves notes, sources, evidence, plans and corrections when you ask. Your assistant can also save without asking when its Exomem instructions allow it.
  • Corrections: a correction replaces old knowledge in a visible way. Exomem keeps the old version and marks it as replaced.
  • Imports: you can also add your own documents with “Import documents” on Home.

The Exomem service cannot open files on your device or your other connectors, and it does not import your past conversations. In Claude Code, the plugin hooks read the current session and Git details, such as the branch and the names of changed files, on your device. They use them to suggest when to search or save, and keep their state and checkpoints on your device.

Your app decides when a tool runs. In Claude, for example, you can set each Exomem tool to ask you first.

Your data

  • Each account has its own storage, which no other account can reach.
  • We encrypt your knowledge base and its backups at rest, and connections to the service in transit.
  • Exomem Cloud is not end-to-end encrypted. Our servers see your requests and answers while they serve them. We hold the keys to your storage, so we could deliberately read your content.
  • We do not use your content to train AI models.

The privacy policy gives the full details, including who processes your data, who can access it, and how long we keep it.

Disconnect an app

  1. On Home, select “Disconnect” next to the app.
  2. Select “Disconnect” again to confirm.

The app can no longer reach your Exomem. Removing the connector inside the app may not end its access on Exomem’s side. “Disconnect” on Home always does.

Export

  1. On Home, under “Your data”, find “Export everything”.
  2. Select “Export”, and wait until the export is ready.
  3. Select “Download”. The download link works for 5 minutes.

You get a ZIP file of your Markdown notes and files. Your connected assistants can pause for a short time while the export runs.

Delete your Exomem

  1. Sign in to Exomem in your browser.
  2. On Home, under “Your data”, find “Delete Exomem”, and select “Delete…”.
  3. Select “Email me a confirmation link”.
  4. Open the link in the email in the same browser.
  5. Select “Permanently delete my Exomem”.

We delete your knowledge base, its storage and its keys. The privacy policy says what we keep for legal duties, and for how long.

Help

For setup, account or privacy questions, use the support page.