JillionDB + Claude Code

Safe database changes for Claude Code

Claude Code writes migrations in seconds. JillionDB shows you each one on your schema, in plain words, before it touches your database.

Try the demo, no sign-up Set up in a minute

It moves fast

Claude Code can write and run a migration in the time it takes to read its summary. Data loss rarely looks dramatic in a diff.

Prompts get turned off

Approving every command gets tiring, so many people let Claude Code work on its own. JillionDB keeps one approval that matters: yours, on the database.

Renames are the classic trap

Asked to rename a column, an agent can drop it and add a new one. JillionDB flags it before anything runs.

Set up in a minute

Create a key in Settings, then run this in your terminal with your key in place of dbk_…

claude mcp add --scope user --transport http jilliondb https://jilliondb.com/mcp --header "Authorization: Bearer dbk_…"

2
Check that it’s connected, then start a new Claude Code session.
```
claude mcp list
```

Make it the rule

Add this to your project’s CLAUDE.md so Claude Code always proposes database changes through JillionDB:

CLAUDE.md

## Database changes

Never write or run database migrations on your own. Propose every database schema change through the jilliondb MCP server with propose_change, give me the review link, and wait. When get_proposal says it is approved, write the migration it returns exactly as given.

Get your key in Settings Full setup guide

Fits your stack

It sits between your agent and your database.

Nothing to replace. Your agent proposes, you approve in JillionDB, and your own migration tool applies the SQL.

What happens next

1
Ask for a change
In plain words, like “add a timezone to users”.
2
Review it
Open the link the agent gives you. Each change is on your schema with its risk and a reason.
3
Approve, edit or reject
Your agent gets the exact migration, or your note, and carries on.

Questions

Still curious?

The docs cover every step, from connecting your agent to reading a review.

Read the docs

Does JillionDB see my data?

No. It works with your schema only, the shape of your tables. It never connects to your database.

Does it replace my migration tool?

No. JillionDB writes plain SQL and your agent puts it where your project keeps migrations. Prisma, Drizzle, Rails, Django, Laravel or plain SQL files all work.

What does it cost?

It’s free during early access. Pro will be $12 a month for unlimited projects, keys and history.

Which databases?

PostgreSQL, MySQL and SQLite.

See it before it happens.

Open the demo and approve an agent’s change in under a minute.

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