Backed byY Combinator

A programming language for work.

The build system for vertical AI companies. Replace growing customer prompts with explicit workflows whose steps can be verified, replayed, and improved.

Fix your agents

You are an accounting operations agent.

Open Xero for the current customer.

Load sales records from the workspace.

Match each sale to an account.

Create one invoice for each sale.

Post invoices when totals reconcile.

Stop when an account mapping is missing.

Do not create duplicate invoices.

Preserve the customer reference.

You are an accounting operations agent.

Open Xero.

Load sales records.

Match each sale to an account.

Create one invoice for each sale.

Post invoices when totals reconcile.

Stop when a mapping is missing.

Do not create duplicate invoices.

+ Consulting services maps to 4000 Consulting revenue.

+ Match Xero customers by billing email when the name differs.

+ If the sales-order ID already exists in Xero, do not create another invoice.

01Open Xero
02Load sales records
03Create invoices from matched salesCreate invoices

Xero rejected invoice INV-1048: “Consulting services” has no account mapping.

Consulting services → 4000 Consulting revenue

Rule saved to workflow · retrying step 03
04Post invoices

More customers should not mean more prompts.

01
A customer shows your implementation expert how the work gets done.
02
The expert turns that knowledge into a prompt.
03
Every missed step becomes another instruction.
04
Soon the business depends on prompts no one can safely understand or change.

Things you keep adding to your prompt.

The prompt becomes an incident log. Every failure adds another sentence, but the sentence remains mixed with the operating instructions.

What went wrongThe line you addedWhat it should become

Business mapping

“Consulting services maps to 4000 Consulting revenue.”

Mapping table

Identity matching

“Match customers by billing email when their Xero name is different.”

Matching rule

Duplicate prevention

“If the sales-order ID already exists in Xero, do not create another invoice.”

Precondition

Business exception

“If the PO number is missing, save the invoice as a draft.”

Conditional branch

Approval policy

“Invoices above $50,000 require finance approval before posting.”

Approval gate

Record your work.

Record Screen

01 Record

02 Compile

03 Test

Screen recording03:42

Create invoices in Xero

source-invoices.csv

01Read eligible sales
02Match customer records
03Create Xero drafts
04Verify invoice count

24 / 24steps verified

Inputs retained
Actions replayed
Result checked

Inputs retained · actions replayed · result checked

Failures have an address.

A failed run points to one step, the input that caused it, and the rule that is missing. Fix that step, then retry from it.

03Create Xero drafts

23 of 24 created

INV-1048 · “Consulting services” has no Xero account mapping.

What should happen?

Consulting services maps to 4000 Consulting revenue.

Double your implementation team’s output.

Build agents faster. Repair the step that fails. Spend less time maintaining prompts—and more time growing your vertical AI business.

2×customer workflows shipped per implementation expert

01
Build faster
Record the work. Compile the agent.
02
Repair one step
Fix the failed step. Retry from it.
03
Reduce maintenance
Keep business rules out of the prompt.

More customer workflows. Same implementation team.

Agents should write workflows.
Production should run programs.

Work should not disappear inside a prompt. It should exist as an explicit program that can be inspected, verified, replayed, and improved.