Build with a coding agent

Read the AGENTS.md the project ships. It is the agent's whole briefing, and you edit it freely:

# Leaseline

This repository defines Leaseline. Its files compile into the running business.

## Before you write
- Connect both MCP servers in .mcp.json.
- Fetch /$.d.ts from the leaseline server: the types of $, cut to your key.
- Read the convention for a file before you change it: https://startupbuilder.dev/code/file-conventions

## While you work
- Keep npx startup-builder dev running. Each save previews as a Change.
- Print a Verb's input with npx startup-builder schema <Noun.verb> before you call it.
- Rehearse every write with --try, or mode "try" in the do tool.

## Never
- Never edit generated/ or .sb/. Name secrets in env.ts; never write a value.
- Never call Stripe or any outside API directly. Call the Verb.
- Never use --env live. Shipping is Change.review, then the founder's Version.deploy.

Check .mcp.json. It connects two servers: the Startup itself on api.sb, and these docs:

{
  "mcpServers": {
    "leaseline": { "url": "https://api.sb/mcp?ns=leaseline.app" },
    "startupbuilder-docs": { "url": "https://startupbuilder.dev/mcp" }
  }
}

The first acts on the business through search, fetch and do (MCP). The second reads documentation and needs no key (docs for agents).

Give the agent its own test key, scoped to the Verbs it needs and expiring on its own:

$ npx startup-builder keys create --name coding-agent --scope leaseline.app --verbs Offer.publish,Change.review --expire-in 30d

Set it as STARTUP_BUILDER_API_KEY in the agent's shell. A test key never touches live data or real money (keys).

Start the dev server in a second terminal, so every edit compiles and previews:

$ npx startup-builder dev

Ask for a change in plain words, such as "add a 60-day notice field to leases". The agent edits nouns/Lease.mdx, the dev server recompiles, and a broken convention fails with the file and line.

When the preview is right, have the agent review the Change. Every test and Evaluator runs on the preview:

Review my change.

Merge and deploy the Change. Ship my changes shows the calls; Version.deploy asks the founder first, so the agent never ships to customers alone.