Better-T-Stack

Better-T-Stack generates a type-safe TypeScript project from the parts the user picks: frontend, backend, runtime, API layer, database, ORM, auth, payments, addons and deploy targets. It rejects combinations that don't work, so let it build the project instead of writing the setup by hand.

Pick the interface

Use the first one you have:

The hosted MCP server can't write files, can't change an existing project and doesn't accept addonOptions or dbSetupOptions. If the user needs any of those, give them the CLI command instead.

Create a project

If the folder already has a bts.jsonc, the project exists. Go to Change an existing project.

1. Settle the stack. If the user left out a major choice (frontend, backend or database), ask one short question or propose defaults and confirm them. Don't add app surfaces, addons, examples or database provisioning the user didn't ask for.
2. Get valid values from the tool, not from memory. Call bts_get_schema, or run npx create-better-t-stack@latest schema --name createInput. When the user has to choose, offer every valid option, not a subset. references/options.md lists the values and the compatibility rules that come up most, but the schema wins if they differ.
3. Build a full explicit config. Set every field. Use "none", [], true or false instead of leaving a field out.
4. Plan before you write. Call bts_plan_project, or run create-json with "dryRun": true. If the plan fails, its error names the conflict. Fix the config and plan again. Show the user the planned stack and get a yes.

5. Create.

   • Local MCP server: bts_create_project with install: false.
   • CLI: the same create-json payload without dryRun, with install: false.
   • Hosted MCP server: bts_get_create_command. Give the user the command to run in a terminal and stop here.

   Installs can outlast tool timeouts, so create with install: false and install as a separate step.

6. Prove it runs. Run <packageManager> install in the new folder. With the user's OK, run the project's typecheck or build script from its package.json. If a step fails, report the exact error.
7. Report. Give the stack and the next commands (dev, database setup such as db:push), taken from the generated README.md and package.json, not from memory.

references/cli.md has the full create-json payload, the flag form for a command the user pastes, and the Stack Builder URL keys.

Change an existing project

bts.jsonc at the project root records the stack chosen at creation and a reproducibleCommand that recreates it. The add command reads it to detect the stack.

1. Read bts.jsonc first. If it's missing, add can't run. Tell the user instead of recreating the file. Never edit it by hand. add updates it.
2. Plan. Call bts_plan_addons, or run add-json with "dryRun": true. Pass addons, a workspace package name, or both. Show the user what will change.
3. Apply after the user agrees: bts_add_addons, or add-json without dryRun.
4. Prove it runs and report, as in steps 6 and 7 above.

axiom can't be added later. It sets up deployment infrastructure, so it must be chosen at creation. A workspace package (package: "shared") scaffolds packages/shared with a manifest, the shared tsconfig and src/index.ts.

Rules

• Plan before every create or add.
• Send full explicit configs to MCP tools. Never send a partial payload.
• Never pass --yolo. It skips the compatibility checks.
• Don't infer addons or app surfaces from a template name or a styling preference.