# The Agent Ledger

> Step-by-step AI agent use-case guides with the real monthly cost and an honest list of what you still do by hand. Weekly newsletter. Costs are estimates to verify unless stated; each page shows the date checked.

## Use cases
- [Your first agent in 60 minutes: a daily inbox + calendar brief](https://theagentledger.ai/plays/first-agent-daily-brief/): Connect an AI assistant to your email and calendar with read-only access, give it one fixed prompt, and schedule it to send you a short brief every morning at 7
- [Cap your AI bill: a usage-limit dashboard in a spreadsheet](https://theagentledger.ai/plays/cap-your-ai-bill/): List every AI subscription and API key you pay for in one spreadsheet. Once a week, paste in usage from each provider's billing page, set a hard spend limit or 
- [Spec-first vibe coding: PRD → tickets → code](https://theagentledger.ai/plays/spec-first-vibe-coding/): Before you open your coding agent, write a one-page PRD. Have the agent split it into small tickets, each with acceptance criteria. Then work one ticket per ses

## Other
- [Costs table](https://theagentledger.ai/costs/): monthly cost estimates for every use case
- [Newsletter](https://theagentledger.ai/newsletter/)
- [About and method](https://theagentledger.ai/about/)