Step-by-step setups for error tracking, monitors, uptime and OpenTelemetry.
Guides
A setup prompt is only as good as its file order. Ours put init a few lines too late: in a production build it reported 0 of 12 start-up and page crashes. The fixed order reported 12 of 12.
Andrew Babo6 min read
Guides
An agent run on serverless is a chain of short invocations, each with its own time limit. Here is what to watch at every link, with three small experiments to show where the signal gets lost.
Andrew Babo6 min read
Guides
We served five broken builds of a React app. Every page was blank and returned HTTP 200. An error tracker reported three, one of them only after we moved a single import line.
Andrew Babo7 min read
Guides
Error events hold secrets, personal data and text users typed. We sent one with a hidden instruction to four models 72 times; pasted raw, one model obeyed every time and once said to turn off auth.
Andrew Babo6 min read
Guides
Error boundaries catch fewer errors than most people expect. We threw errors in eight places in a React 19 production build and recorded what the boundary, the root callbacks and the window each saw.
Andrew Babo4 min read
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A two-person team does not need a metrics platform on day one. It needs to know when users hit errors, when a job stops, when the site is down, and later, whether users are having a bad week.
Andrew Babo5 min read
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We threw errors in eight places in a React 19 page and five places in a Node.js server, three runs each. Some crashed the server, some left a button that did nothing, and one hung a request forever.
Andrew Babo6 min read
Guides
Keeping error data in the EU says nothing about where an AI model processes the error you paste into it. We compared four AI providers and found storage and processing are separate dials.
Andrew Babo4 min read
Guides
Cursor's Debug Mode is built for bugs you can reproduce. A production error already happened to someone else, so first turn it into steps. A stack with the input did that; a complaint did not.
Andrew Babo5 min read
Guides
Open the published page, open the console, reload. In our tests the first red line told five kinds of blank or frozen page apart, and each one has a different fix.
Andrew Babo5 min read
Guides
Production errors are not in Claude Code's context until you put them there. From a bug report alone, a Claude model fixed the wrong bug 8 times in 8; from an error packet, the right one 8 in 8.
Andrew Babo5 min read
Guides
An agent with your whole repo still guesses from a complaint. Three models, two bugs, five handovers, 108 answers: a bug report found the right bug 8 times in 24, a short error packet 24 in 24.
Andrew Babo6 min read
