> For the complete documentation index, see [llms.txt](https://docs.brain.fi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.brain.fi/build.md).

# Build

- [Overview](https://docs.brain.fi/build/overview.md): Task-shaped guides. The patterns most apps need in their first hour.
- [Sign Up and Onboard](https://docs.brain.fi/build/sign-up-and-onboard.md): Go from zero to an authenticated sandbox tenant. Human login or a wallet-based agent.
- [Read a Financial Picture](https://docs.brain.fi/build/read-a-financial-picture.md): Pull balances, transactions, obligations, and counterparties for a tenant.
- [Pay an Invoice Safely](https://docs.brain.fi/build/pay-an-invoice-safely.md): Propose a payment, route to approval if needed, execute, get a receipt.
- [Give an Agent a Spending Limit](https://docs.brain.fi/build/give-an-agent-a-spending-limit.md): Define a policy in plain English. Brain enforces it on every proposed action.
- [Audit Every Action](https://docs.brain.fi/build/audit-every-action.md): Pull a verifiable trail of what your agent (or user) did.
- [Let an External Agent In](https://docs.brain.fi/build/let-an-external-agent-in.md): Authorize an MCP-compatible agent to read and propose on a tenant's behalf.
- [Install the Brain Finance Plugin](https://docs.brain.fi/build/use-brain-agent-skills.md): Install all 11 Brain Finance skills and the official MCP connection, as a Claude plugin or from any MCP-capable agent runtime.


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