Substrate

If you're building a founder copilot or any AI agent that needs to remember things across sessions, this gives Claude direct access to Butterbase's per-user memory backend. It's got four stores: entities (people, companies), business state (MRR, headcount), institutional memory (decisions, learnings), and an append-only action ledger. Every write goes through a propose, policy check, execute loop so agents can't quietly trash your data. The anti-patterns section is worth reading closely: the action ledger is truly append-only, update_entity replaces the whole attrs object instead of patching, and you need canonical_keys or primary_email for dedup to work. Not for plain CRUD apps, but if you want a single source of truth that an agent operates on, this is the primitive.

Install to Claude Code

npx -y skills add butterbase-ai/butterbase-skills --skill substrate --agent claude-code