Your AI agents write better code
when they understand your product
brAIn generates a living knowledge base from your codebase — architecture, data models, API patterns, and product context — and serves it to AI agents via MCP. So they stop guessing and start building like a team member.
Free to start — no credit card required.
Live Context
When an AI agent asks brAIn about your codebase, it gets structured, up-to-date context — not a raw file dump.
$ Add a subscription upgrade flow
● Querying brAIn for context...
architecture → Stripe billing via /api/webhooks/stripe
data-models → subscriptions table linked to orgs
key-patterns → Plans defined in lib/billing/plans.ts
product-context → Free → Pro upgrade shown post-trial
✓ Agent has full context. Building with awareness of existing billing patterns...
Brain Document
Each repo gets 7 structured documents that capture everything an agent needs to write correct, consistent code.
Overview
Next.js 15 App Router monolith with Supabase backend. Server components for data fetching, client components for interactive UI. API routes handle webhooks, auth, and MCP serving.
Key Services
Boundaries
→ src/app/api/ — API routes (auth, webhooks, MCP)
→ src/lib/ — Core business logic, isolated from UI
→ src/components/ — Reusable UI, no business logic
The Problem
AI agents write code blind
They can parse syntax. They can't understand intent.
- ✕Adds a payment form — doesn't know Stripe is already integrated
- ✕Creates a new users table — misses the existing auth schema
- ✕Builds an endpoint that skips your auth middleware pattern
- ✕Writes code that works but breaks your app's conventions
- ✓Knows Stripe handles billing, extends the existing flow
- ✓Understands your data model and creates proper relations
- ✓Follows your auth patterns and middleware conventions
- ✓Writes code that looks like your team wrote it
Why brAIn
Context that keeps up with your code
Product-Aware, Not Just Code-Aware
brAIn maps user flows, business rules, and intended behavior — so AI agents know what your app should do, not just how it's built.
Always Current, Never Stale
GitHub webhooks trigger targeted updates on every push. Only affected documents are regenerated. Your brain never falls behind.
Works With Your AI Tools
Ships as an MCP server. Claude Code, Cursor, Windsurf, and any MCP-compatible tool can query it instantly. Zero config on the agent side.
How It Works
Three steps to smarter agents
Connect
Link your GitHub repo. One click, read-only access.
Index
brAIn analyzes your codebase and generates 7 brain documents.
Query
Point your AI tools at your MCP endpoint. They get context automatically.
After setup, brAIn auto-syncs on every push — brain documents update in seconds.
Brain Documents
Seven dimensions of understanding
Each document captures a different facet of your codebase, structured for machine consumption.
User flows, business rules & intended behavior
System design, services & boundaries
Schemas, relationships & constraints
Endpoints, request shapes & auth patterns
Conventions, error handling & testing
Module graph, versions & integrations
Config, deployment & feature flags
Built For Developers
Stop re-explaining your codebase to AI
“I used to spend the first 5 minutes of every Claude session re-explaining our auth flow. Now it just knows.”
— Solo founder
“Our AI agents kept creating duplicate API endpoints. After connecting brAIn, they follow our existing patterns.”
— Engineering lead
“It's like giving your AI agent the onboarding doc that you never wrote.”
— Senior developer