Stop rebuilding solved problems.

Strata composes proven backend modules straight into your project — reading your schema, following your conventions, wiring them in the right order. Then it writes one command that boots your app and proves the feature actually works.

Install → See the numbers ↓
−66%tokens, same task & model
−52%agent turns
3×faster, wall-clock
100%of checks passed, every run
The part nobody else does

It doesn't just write the code.
It proves it runs.

Writing the feature was never the expensive part. Proving it works is — and that's what Strata hands you.

node strata/verify.js

Every check runs against your data — your fields, your routes, your ID column. None of it is faked.

How it works

One tool call. Real files.

No black box, no payload. Strata writes ordinary code into your repo and tells you exactly what it created and what it touched.

01

Reads your project

Finds your schema — Prisma, Mongoose, Drizzle, TypeORM or plain JS — and reads your real data model. Your fields, your types, your ID column.

02

Composes the modules

The pieces go together in the right order — the part teams usually get wrong. Logging before parsing, rate limits before routes, error handling last. You don't have to think about it.

03

Writes real code

Files land in your repo, in your style. Strata tells you exactly what it created and what it changed. Read it, edit it, delete what you don't want — it's your code, not a dependency you're stuck with.

04

Proves it works

Strata hands you one command that boots your app and puts the feature through its paces — the real thing, running, not a promise that it should work. Run it and see for yourself.

Measured · v1.1

Same task, same model. Two thirds fewer tokens.

A product API — pagination, per-IP rate limiting, request logging. Haiku, three runs per arm.

−66%tokens950k → 320k
−52%turns31.3 → 15.0
3×faster190s → 63s
Same task, same model: 66% fewer tokens, 52% fewer turns, 67% less wall-clock time.
mean of three runs per arm
Per run Without Strata With Strata Change
tokens 950,011319,604−66%
turns 31.315.0−52%
wall-clock 190s63s3× faster
cost $0.190$0.077−59%
checks passed 70.8%100%—
The other 30%

The checks it failed are not cosmetic.

Real failures, from real runs. All of it code that runs, returns 200, and looks done.

WITHOUT STRATA — one malformed request
HTTP/1.1 400 Bad Request
Content-Type: text/html; charset=utf-8

<!DOCTYPE html>
<html lang="en"><head><title>Error</title></head>
<body>
<pre>SyntaxError: Unexpected end of JSON input
    at JSON.parse (<anonymous>)
    at parse (C:\Users\...\node_modules\body-parser
              \lib\types\json.js:96:19)
    at C:\Users\...\body-parser\lib\read.js:128:18
    at AsyncResource.runInAsyncScope (node:async_h…
Your filesystem paths, handed to whoever sent the bad byte.
WITH STRATA — the same request
HTTP/1.1 400 Bad Request
Content-Type: application/json

{
  "error": "malformed JSON in request body",
  "details": [
    { "field": "body",
      "message": "could not be parsed as JSON" }
  ]
}
What to fix, and nothing else.

Both answered 400. Only one is safe. Failed 6 of 6 unaided runs, passed 6 of 6 with Strata — and no session ever mentioned it.

A retry with a different body was accepted

POST /orders Key: k-1 { "items": [ A ] } → 201 Created POST /orders Key: k-1 { "items": [ B ] } → 200 OK, order A

The client asked for a different order and was told it succeeded. Order B never exists. Should be 409.

Failed 3 of 3 unaided · passed 3 of 3 with Strata.

The page size was ignored

GET /products?limit=5 → 200 OK, 10 items

Pagination that returns whatever it likes. Nothing errors. Nothing logs.

One unaided run in three.

Your schema was edited, unasked

task: "a retried order request must not create two orders" modified: prisma/schema.prisma

The task never mentions the data model. No Strata run touched it.

Unaided: 6 files across 3 runs, only 3 every time. Strata: the same 10, every time.
Same prompt, three times

Run it three times. Get the same answer three times.

Not whether one run was good — whether the next one matches.

Quality of every individual run. Without Strata the results scatter; with Strata every run of a task lands on the same score.
every individual run · not the average
Task Without Strata With Strata Spread
product API 63% · 75% · 75% 100% · 100% · 100% 0.0 pts
idempotent orders 14% · 71% · 71% 100% · 100% · 100% 0.0 pts
payments + queue 0% · 0% · 50% 0% · 100% · 100% 50 pts
0.0 pts

Spread with Strata, on the tasks its library covers. Without it, 26.9 points on the same prompt.

14%

One unaided run of a prompt that scored 71% twice. Its create endpoint rejected every request shape, so five checks collapsed at once. A cliff, not a worse result.

0/9

Baseline runs that got a rate limiter’s refill right — at every tier. With Strata, 6/6.

Where it doesn’t hold

On payments, Strata covers the webhook and nothing else — 0.95×, a wash, and both arms shipped a build that does not run. The advantage tracks coverage. Strata also declines outright, about a third of the time.

Method

n=3, Claude Haiku 4.5. Checks frozen before the first run, each with a control proving it can fail. Graded by a separate suite — never Strata’s own verifier. Full method and per-run scores →

Coverage

Every module earns its place.

Small, deliberate, and battle-tested. Each one passes six machine-checked gates before it can ever reach your project.

Reads your schema from

Prisma Mongoose Drizzle TypeORM Sequelize Plain JS

If Strata cannot identify your entity with confidence, it says so and leaves a slot — rather than guessing and silently serving the wrong rows.

The Strata Library

Read every line before you install it.

/
8 modules · 1,264 assertions · 6/6 gates each

Install

One tool. One line of config.

Strata is an MCP server. It runs locally, on your machine, against your code.

.mcp.json 
{
  "mcpServers": {
    "strata": {
      "command": "npx",
      "args": ["-y", "stratalib"]
    }
  }
}
Your code stays yours. Strata sends the task, never your source or schema.
One tool. strata_use — that is the entire surface.
Works with Claude Code, Cursor, VS Code, Claude Desktop, or any MCP client.

Then just ask for the feature.

› Build a product search API — full-text search with facets, cursor pagination, request validation, structured logging, and rate limiting.
↓
✓ composed 5 modules into your Prisma schema
✓ wrote server.js, strata/lib.js, strata/verify.js
✓ 15/15 checks passed against a running server
Begin

Stop rebuilding. Start composing.

Read every line, run every check, and keep the code. It was always yours.

Install Strata → Browse the library