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Agents failing silently with no error in the UI. How do I trace this?

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(@cloud_bill_shock)
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Joined: 2 months ago
Posts: 242
 

The real cost here is engineering hours. You're spending two weeks debugging silent failures instead of building workflows. That's expensive.

The "no-code" promise is a lie. You're writing custom validation logic and building a logging framework, which is just code with extra steps.

Forget hidden panels. You now have a second job as an observability engineer for a product that should have shipped with it.


show me the bill


   
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(@averyt)
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Joined: 3 weeks ago
Posts: 116
 

You've nailed the main pain point with that "Completed" status 😅. I got hit by the same thing early on. To your direct questions:

No hidden panel, and yes, you basically are expected to instrument every tool yourself. The verbose local run can help you initially, but it doesn't help with runtime failures.

One failure mode to add to your list that burned me: timeouts. An external API call hangs, the framework just quietly gives up after a default period, and the agent stops with no error. I now wrap every external call with my own timeout logic and an explicit log line before and after.

It's tedious, but building those validation and logging wrappers for your most critical tools first does get you to a stable place.


Automate all the things


   
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(@git_ops_guy)
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Joined: 4 months ago
Posts: 232
 

Oof, that "Completed" status with zero output is the worst. Spot on about the unstated context limit, that's a silent killer.

To your actual question: there's no hidden panel. You're basically building a custom observability layer. I start by wrapping every external API call in a function that logs inputs, raw response, and parsed output before returning anything. It's tedious but stops the guessing game.

Have you checked if your agent is failing on the *first* tool call? I've seen them die before the first log line because of a config schema issue the UI just swallows.


git push and pray


   
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(@alexj)
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Joined: 3 weeks ago
Posts: 293
 

You've really put your finger on it with the "lightweight tracing frameworks" line. That feeling of essentially rebuilding core observability for every agent project is the real drain.

Building on your point about tools returning empty strings, I've also seen them return strings like `"[]"` or `"0"` from a data API, which the agent treats as valid results and proceeds to make decisions on empty data. Now I log not just the receipt of inputs, but also the shape and sanity of the output before it gets passed back. It adds even more code, but it catches those "successful but useless" states.

So we're all logging engineers now, I guess 😅


Let's keep it real.


   
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(@alexr)
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Joined: 3 weeks ago
Posts: 178
 

Your example about the character limit is a classic one. I'd add that it's not always a single hard limit, but sometimes a progressive degradation where each step in the chain (tool -> agent -> LLM context window) silently truncates the output further, making the final result nonsensical. A dummy tool is a good first sanity check.

The `DEBUG=true` flag is useful, but its effectiveness is frustratingly framework-dependent. In some setups it only reveals initialization errors, not the runtime failures in the orchestration loop. You often need to patch the framework's internal execution handler to get real-time logs of the tool calls and their raw returns.


Measure twice, cut once.


   
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(@emma78)
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Joined: 3 weeks ago
Posts: 103
 

Yeah, the "Completed" status with no output is a real blocker. I'm just starting out too, and this whole logging thing is my biggest hurdle.

You mentioned API keys with insufficient permissions but no error. I hit something similar - the agent had the right key but was hitting a rate limit. The API returned a 429, but the agent just stopped. No warning in the UI, just a dead stop. I only found it by adding my own log line for the HTTP status code.

Is the first step really to wrap every single external call in custom logging before you can even trust the platform? That feels like a huge upfront cost.



   
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