Business and Sales · Blog · 🇺🇸 United States · via agentusecases.ai
Two agents reviewing each other on the company tax return
Claude Code wrote the calculations from QuickBooks data and Codex reviewed them until they agreed.
- Profession
- Business Owner
- Tools
- Claude Code, Codex
- Source
- common-sense.com ↗
- Country
- 🇺🇸 United States
- Found via
- agentusecases.ai (Alex Finn) ↗
- Report date
- no date
- Verified on
- October 25, 2026
What they did
The author kept QuickBooks exports and statements in a private repository. Claude Code wrote scripts that read the data and calculate the forms; Codex reviewed the scripts, and the two went back and forth until everything reconciled.
How it went
The author reports a consistent tax return, which they checked before filing.
Good to know
Using a second AI as a reviewer is a cheap best practice.
The prompt
Here is my trial balance for [year] and the statements [attached]. Calculate [taxes/obligations], showing each formula and the source of every number. Then review your own calculation like an auditor and list what could be wrong.
Replace what is in [brackets]. Prompt written by us from the account, not a literal copy of the source. Do not paste other people’s personal data (privacy laws such as LGPD and GDPR apply).
Summary in our own words. Results as stated in the original account; we have not tested or audited them. Read the source ↗ Case found via agentusecases.ai (Alex Finn); text and prompt rewritten by us. Found a mistake?
Similar cases
01Bookkeeping for a Swedish company with agents
A cofounder had agents read receipts, suggest accounts and VAT, and prepare entries for approval.
02Paying an overseas supplier with an agent and human approval
An agent checks balances in several currencies and prepares the payment; a person reviews and approves it.
03Canceling insurance by phone and recovering money with an agent
Forbes reports on people who used an agent to call the insurer and cancel a policy with a refund.
04Separating business expenses from personal card statements
The author had Claude talk through the first few statements to learn her patterns before classifying the rest.
05Researching 50 target companies and filling in the CRM
A Dutch consultant filters the list by hand, then the agent researches each company and creates records ready for outreach.
06Comparing prices of 15 CRMs in a spreadsheet
The reviewer asked Manus for plans, free-tier limits and G2 ratings for the 15 leading CRMs.
07Giving an agent a server and the mission of building a business
A dev let Claude Code run every 30 minutes on a VPS, with memory kept in files, asking for help via Telegram.
08Developer Launches a Building Conceived with the Help of AI
Vitacon used AI to design a 700-studio development in Vila Mariana, in São Paulo.