Claude computer use fills a synthetic tax form
AiRabbit tested Claude computer use on a browser-based tax form and synthetic local records. It produced a draft but entered an incorrect ZIP code and omitted the address.
airabbit.blog
Original prompt
Shared by the source author. See source notes for context.
fill in the form in firefox using the fields in /.home/computeruse/.anthropic
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Sourced account- Source author
- AiRabbit
- Original account
- Read the source ↗
- Published
- Source link checked
- Reported result
- The agent filled a simplified form draft, but inspection found an incorrect ZIP code and missing address; no real return was filed.
- Human involvement
- AiRabbit created the test data, redirected the agent to the original request and inspected the form, finding wrong and missing fields.
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How the agent did it
- Create synthetic local tax records and a browser-based form after PDF editing fails.
- Ask Claude computer use to inspect the files and identify needed fields.
- Let it enter Firefox fields, then compare the displayed values with the records.
AiRabbit tested whether Claude computer use could read a tax form, find relevant information in local files and enter the fields. An earlier PDF-editor attempt failed, so the author created a simplified browser version of Form 1040 and generated fictional tax records in a shared folder.
Claude initially asked for information already included in the request. After the author directed it back to the prompt, it examined the folder, took screenshots of Firefox and entered the form one field at a time. The author reports that the roughly two-page form was filled after a few minutes.
Inspection exposed an incorrect ZIP code and a missing address. The article also contains inconsistent salary figures in the generated data and the author's discussion of a correction. That inconsistency prevents treating the demonstration as a reliable tax calculation. The useful result is a partially successful local-file-to-browser workflow with visible entry failures.
The author recommends separating extraction from form entry and having a person confirm values. This was a synthetic experiment, not a real submitted return. Browser control worked better than the external PDF application, but successful navigation did not eliminate field-recognition mistakes or the need for review.
Prompt
Original prompt
Source: Blog · AiRabbit
Frequently asked questions
Was this a real tax filing?
No. The author generated sample records and used a simplified browser form.
What went wrong?
The ZIP code did not match the extracted value, the address was missing and the source’s salary correction discussion is internally inconsistent.
Why was a browser form used?
The earlier PDF-editor attempt was unsuccessful, so the author switched to Firefox for the experiment.
More details
Remaining steps
- Correct missing or wrong data and keep calculation inconsistencies explicit.
About this account
Claude reads local records, screenshots the browser and fills the synthetic form with documented entry errors.
Firsthand primary account opened and read; original publication date checked in primary metadata or visible timestamp. Outcomes are author-reported, not independently reproduced. Synthetic test; missing and incorrect fields; inconsistent source salary figures retained as limitation. Original prompt excerpt reproduced exactly from the source; excerpt only, not the complete prompt.
Credit: AiRabbit
Source published
Added to Agents In Use
Source checked
Tools and topics
Claude computer use · Firefox · Shared local folder · Synthetic tax records
Work · Reported deployment
Editorial completeness: 100/100. Measures documented fields, not agent performance or verified outcomes.