Substrate

Substrate is a shared memory layer for AI agents working on engineering projects. It captures the work-in-flight context, drafts, decisions, claims, open questions, that lives between commits and never makes it into GitHub, Slack, or a CLAUDE.md, so agents working in parallel converge through shared working memory instead of diverging on merge. Built on MongoDB Atlas with $graphLookup and Vector Search composed in a single aggregation, exposed to any agent via MCP.