Test your agent's spending cap with a purchase that should fail
With Agent Vault he set a $30 spending cap, then let the agent try to check out a $45 item. It was declined, and the agent never saw his card number.
Source
@LeoCreaIA on X · 2026-10-15
Written in our own words. Credit to the original author. Link checked 2026-10-23.
What they did
With Agent Vault he set a $30 spending cap, then let the agent try to check out a $45 item. It was declined, and the agent never saw his card number.
Result (as claimed)
Seeing the cap work on a real checkout was what convinced him to let the agent shop.
Tools they used
Cost: Pricing depends on the tools you pick; check each official pricing page.
Set it up
Gather the documents
Collect statements, bills, invoices or tax documents for the period you want reviewed.
Ask for an audit, not actions
Have Agent Vault list findings, amounts and suggested next steps before it does anything.
Approve each action
Approve cancellations, disputes or payments one at a time. Never give an agent open-ended access to move money.
Track the result
Record what changed and what you saved so you can check it next month. This is not financial advice.
Copy the full setup prompt
Paste into your agent and it will walk you through the setup, asking before anything that sends, posts or spends.
You are helping me set up this AI use case end to end in Claude Code. Goal: Test your agent's spending cap with a purchase that should fail What the original author did: With Agent Vault he set a $30 spending cap, then let the agent try to check out a $45 item. It was declined, and the agent never saw his card number. Reported result (as claimed by the author): Seeing the cap work on a real checkout was what convinced him to let the agent shop. Source: https://x.com/LeoCreaIA/status/2110773476684665133 Tools they used: Agent Vault Category: Money Please: 1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like). 2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure. 3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data. 4. Finish with a checklist to run it again next time.
You are helping me set up this AI use case end to end in Codex. Goal: Test your agent's spending cap with a purchase that should fail What the original author did: With Agent Vault he set a $30 spending cap, then let the agent try to check out a $45 item. It was declined, and the agent never saw his card number. Reported result (as claimed by the author): Seeing the cap work on a real checkout was what convinced him to let the agent shop. Source: https://x.com/LeoCreaIA/status/2110773476684665133 Tools they used: Agent Vault Category: Money Please: 1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like). 2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure. 3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data. 4. Finish with a checklist to run it again next time.
You are helping me set up this AI use case end to end in Grok Bot. Goal: Test your agent's spending cap with a purchase that should fail What the original author did: With Agent Vault he set a $30 spending cap, then let the agent try to check out a $45 item. It was declined, and the agent never saw his card number. Reported result (as claimed by the author): Seeing the cap work on a real checkout was what convinced him to let the agent shop. Source: https://x.com/LeoCreaIA/status/2110773476684665133 Tools they used: Agent Vault Category: Money Please: 1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like). 2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure. 3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data. 4. Finish with a checklist to run it again next time.
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Guides for this use case
How to give an AI agent a budget or a card safely · How to use AI agents for taxes, bills and budgets · How to secure vibe-coded apps and agents
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