Build. Keep everything. Your AI work compounds.
A portable AI workbench that sits between you and every tool you use. Every session builds on the last.
deno run -A jsr:@fathym/fai/installWorks today with
See it in action
47 patterns. 12 decisions. 3 contexts. Built automatically.
What Fathym actually is
Your context. Portable. Shared across every tool.
Your AI tools — Claude, Cursor, Codex, anything
Use the tools you already love, exactly as you do today. Nothing changes about how you work.
Fathym — persistent context, shared across everything
Captures what you build, how you think, and what you've decided. Injects that knowledge into every session, every tool — automatically, without you lifting a finger.
Your vault — plain files, fully owned by you
Everything Fathym learns lives in Markdown files in your own project directory. Open source, git-backed, zero lock-in. Your knowledge, portable forever.
The shift
Every AI tool remembers.
None of them remember each other.
Without Fathym
- ✗Each tool is its own silo — context doesn't travel
- ✗Switch tools, re-explain everything from scratch
- ✗Your preferences live in whichever tool you taught them to
- ✗Session 50 in a new tool feels like session 1
- ✗Your AI knowledge is owned by someone else's platform
With Fathym
- ✓One context, shared across every tool you use
- ✓Switch models without losing a thing
- ✓Your preferences follow you everywhere, automatically
- ✓Every new tool starts from session 50, not session 1
- ✓Your context lives in your own files — forever
What compounding intelligence feels like
Your AI builds on itself — session after session.
01
The AI stops asking
You used PostgreSQL last time, and the time before that. Fathym noticed. You don't get asked again — and every tool you switch to already knows.
02
You pick up mid-thought
Come back to a project after weeks away. Your AI already knows where you left off and what you were trying to do — in any tool, instantly.
03
Switching tools is seamless
Move from Claude Code to Cursor to Codex. All of them working from the same understanding of how you build — one context, every tool.
How intelligence compounds
Three vaults. One growing picture of how you work.
What just happened
Every AI conversation, file change, and terminal command is captured automatically as you work. When you seal, it feeds into your project and personal vaults through synthesis.
Temporary working storage · feeds the knowledge vaults
What you're building
Architectural decisions, patterns, stack choices, team norms. The knowledge that gives every tool a complete picture of your project — without a 10-minute re-brief.
Grows with your project · shared across your team
How you think
Your preferences, instincts, and working style crystallized over time. Every tool you use learns the same thing: this is how this person builds.
Yours forever · travels with you across every project
Built for how you actually work
No new habits. No lock-in. Just a smarter layer.
Nothing changes about how you work.
Run fai once. Use Claude Code, Cursor, Codex — whatever you already love. Fathym runs quietly underneath, enriching every tool's context automatically. No new workflow to learn.
Your context is yours. Not ours.
Everything Fathym learns lives in plain files you own — FAI-PROJECT.md alongside your code, FAI-PERSONAL.md in ~/.fai/. Open source. No proprietary format. No lock-in. Clone it, push it anywhere, read it anytime.
It only gets better over time.
Session 50 is measurably smarter than session 1. The longer you use Fathym, the less you have to explain — and the faster every tool you use becomes. This is what compound intelligence feels like.
YOU^AI
Your AI finally knows you. Every tool. Every session.
Install in under a minute. Works with the tools you already use. Free to start.
deno run -A jsr:@fathym/fai/install