Splitting vision AI into two calls improves screen assistant accuracy and reliability

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Developer of Handrail, an open-source screen assistant, found that asking a vision model to simultaneously answer a question and identify UI coordinates in a single API call degraded performance on both tasks. The app now makes two separate calls against the same screenshot: one for reasoning and answering, and another focused solely on locating the relevant on-screen control. Coordinates are returned on a normalised 0–1000 grid rather than raw pixels, eliminating resolution and multi-monitor arithmetic across different hardware setups. The two passes also use different image formats — a compressed JPEG for reading and a full-resolution PNG for precise localisation of small UI elements. Handrail runs locally with no account or server, stores data as plain JSON, and is available as an Apache-2.0 open-source project for Windows and macOS.

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ProgrammingDEV Community ·

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