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Browser tool bug returns '[object Promise]' due to sync/async mismatch

A bug in a browser automation tool caused it to return the literal string "[object Promise]" instead of actual webpage content. This occurred because the tool used AppleScript to execute JavaScript, and the JavaScript code contained an `await` call within an asynchronous function. AppleScript, being synchronous, could not handle the asynchronous operation and instead stringified the pending Promise object, returning it as the result. This silent failure went unnoticed by the AI agent using the tool, leading to incorrect conclusions and propagating errors. AI

影响 Silent failures in AI tools can lead to incorrect conclusions and propagate errors, highlighting the need for robust error handling and understanding of underlying system behaviors.

排序理由 The cluster describes a bug in a specific software tool and its technical cause.

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  1. dev.to — MCP tag TIER_1 English(EN) · אחיה כהן ·

    My browser tool returned "[object Promise]" as a webpage. One grep later, 10 more tools had the same bug.

    <p>The bug report was three words long: "navigate_and_read returns junk."</p> <p><code>safari_navigate_and_read</code> is supposed to navigate Safari to a URL and hand the page's text back to the AI agent driving it. So I called it. It didn't throw. It didn't time out. It returne…