Substrate

Your past feedback, conventions, decisions and changes, captured from your sessions and files. Claude Code and Codex recall them on every prompt, when relevant.

It's all on pages you can read and edit. Delete a line and your agents stop seeing it.

Upload a few project files and watch your first page appear. Or install the Claude Code plugin with one command, sign in with OAuth and keep coding. Every line on the page links to its source.

First 2 weeks free with code LAUNCH26, then $20/mo.