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Living Brain API
Now in early access

Never start from zero again.

Living Brain turns everything your users read, write, and say into a knowledge vault that compounds — surfacing non-obvious connections across conversations, documents, meetings, and time.

Quickstart API Reference
quick-start.sh
# Authenticate and create a brain
$ curl https://api.livingbrain.com/v1/brains \
-H "x-api-key: $LIVING_BRAIN_API_KEY" \
-H "x-subject-id: user_123" \
--json '{"name": "Research"}'
# 201 Created
{ "id": "brn_01", "name": "Research",
"slug": "research", "subjectId": "user_123" }
$
API referenceSDKsCLIMCP
MCP server

Give your agent a brain.

Every Living Brain operation is a tool on the hosted MCP server. Paste one snippet into Claude Code, Codex, Cursor, or VS Code and your agent can capture, search, and recall knowledge across sessions.

Read the MCP guide →Using ChatGPT or Claude?Connect Living Brain with your account sign-in. No API key or code. →
Connect your MCP client
Browse all 60 tools ↗
Terminal
claude mcp add --transport http livingbrain \
  https://livingbrain.fernmcp.dev/livingbrain \
  --header 'x-api-key: YOUR_API_KEY' \
  --header 'x-subject-id: YOUR_SUBJECT_ID'

Run it in a terminal. Claude Code picks the server up on its next start.

CLI

Or let it use the terminal.

Any coding agent that can run shell commands can use the livingbrain CLI directly. Install it, set your key, and ask the agent to save or find something.

Read the CLI guide →
Claude Code
>Save the notes from today's onboarding call to my Research brain
●Bash(livingbrain brains list --query "[?name=='Research'].id")
└["brn_01"]
●Bash(livingbrain captures capture --brain-id brn_01 --json '{"kind": "note", "content": "The customer prefers weekly check-ins and dislikes long emails."}')
└{ "id": "src_01", "kind": "note", "status": "pending" }
●Saved to Research. Living Brain links it to related pages once it finishes compiling.
>

Start here

Guides

Quickstart, authentication, core concepts, and how to capture, search, and sync a brain.

SDKs

Typed clients for TypeScript and Python, so you can call the API without hand-rolling requests.

CLI

Call every endpoint from your terminal or CI with the livingbrain command.

MCP

Connect Claude Code, Cursor, or VS Code to the hosted MCP server and use a brain as agent memory.

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