Dev.to
7/18/2026

The original title is: "Project Log #17: My Agent Misreads Bank Balances. Here's How I'm Fixing It."
Original: Project Log #17: My Agent Misreads Bank Balances. Here's How I'm Fixing It.
Short summary
A developer building a phone-controlling AI agent discovered OCR misreads banking app numbers 20% of the time due to small fonts, low contrast, and currency symbol confusion. They built a three-step verification layer — format validation, double-read confirmation, and range validation — that improved accuracy to 94% overall and 100% on specific test cases. The tradeoff is 4-6 seconds of added latency per financial task.
- •OCR on banking apps misreads numbers ~20% of the time due to fonts, contrast, and currency symbols
- •Three-step verification (format, double-read, range) improved accuracy to 94% overall, 100% on targeted tests
- •Verification adds 4-6 seconds latency; text extraction still lacks verification
Generated with AI, which can make mistakes.
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