Persistent Memory for Claude Code - Unison MCP Setup

Learn how to give Claude Code persistent team memory using the Unison MCP server - every session recalls your project's decisions automatically.

Install

claude mcp add unison-brain -e UNISON_TOKEN=usk_live_... -- npx -y @unisonlabs/mcp

No key yet? npx @unisonlabs/cli auth login - email OTP, no browser.

The loop the agent runs

1. Task start: brain_context with the task as the query - relevant decisions, facts, and history arrive as one markdown block.
2. While working: brain_record_fact when something durable is learned; brain_write for documents worth keeping.
3. Task end: brain_ingest the conversation so extraction captures what the session produced.

Every other session - yours, your teammates', tomorrow's - recalls what this one learned.

Make it automatic

Install the Unison skill so sessions run the loop without being told - it encodes search-first/write-back, the path contract, and the weakEvidence rule:

# from the unison-brain repo
cp skill/SKILL.md ~/.claude/skills/unison-brain/SKILL.md

Working in a team? Each teammate connects with their own key to the same workspace; what one session writes to /workspace/, every session recalls. Your agents stop disagreeing by accident.