As admins, we’ve all been there. We do the right thing to reduce technical debt, perhaps by rebuilding logic in the newest tool to stay ahead of the curve. For example, I was recently working on an agent originally built in the legacy builder. I rebuilt it in the new Agentforce Builder, and it worked exactly as expected. Success, right?
Not quite.
When I updated my flow with an invocable agent action using this new agent, maintaining the exact same structured outputs as before, it completely failed. On paper, it was a 1-to-1 match. In reality, I was greeted by the dreaded red text of a failed flow.
I tried it with another use case and a different agent. Same flow failure. I hit a wall trying to figure out the problem. As it turns out, my dedication to using highly descriptive naming conventions (like a good admin does) had finally caught up with me!
If you’ve ever had a flow, integration, or automation fail even though everything looks right on paper, you know how frustrating that moment can be. Here’s how I got unblocked and why every admin, whether you’re a rookie or a Flow pro, should return to troubleshooting basics: simplify and test.
The strategy: Strip it down to step 1
When I first started to build flows as a newbie over a decade ago (has it really been that long?!), I did it piece by piece. I’d build one element, test it, and, if it worked, I’d add the next. I validated my automation along the way instead of waiting until the very end.
Nowadays, it’s so tempting to just build complete flow masterpieces all at once, only to hit “Debug” at the finish line and watch it crash. When that happens, fixing the whole automation at once can be really overwhelming.
To find the “point of failure,” you have to remove the noise. I have the extra benefit of reaching out to the PM for invocable agent actions, and seeing the action work in a stripped-down test flow forces me to remember my own fundamental rule as a baby flow builder: Break it down to the simplest components. This approach isn’t just useful for this one situation — it can be applied as a troubleshooting pattern that works across Salesforce.
If you’re staring at a failed flow, ready to pull your hair out because you can’t figure out why it’s not working, go back to basics with this “rinse and repeat” method.
- The “JenTest” Method: Create a brand new, bone-simple flow. Leave your complex production naming conventions at the door for a minute. Just call it JenTest.
- Do the Single-Element Test: Add just the invocable action with one structured output. Nothing else. Does it run?
- Validate and Add: Once that basic version works, add your second structured output. Test. Add the next one. Test.
If it worked at step 2 but failed at step 3, you aren’t just guessing anymore — you’re diagnosing. Once you complete one element, move on to the next one. Once that validates, move on to the next. Rinse and repeat.
The culprit: Finding the naming sweet spot
Here was my “aha!” moment. My JenTest flow worked perfectly. But as soon as I updated the Flow API name and the Action element name for the real version, the flow failed.
I found the culprit: a character limit on auto-generated Lightning Type Apex class. When you configure structured outputs, Salesforce auto-generates Lightning Types Apex classes behind the scenes using this formula:
LightningTypes__<Flow API Name><Action API Name>
If we get a little too enthusiastic with our descriptive names, that generated string hits a hard character limit and the flow stops in its tracks.
The lesson: Best practices, just shorter!
You can absolutely still follow the best practice of using clear, descriptive names — you just have to be mindful to keep your API names short and concise. Think Acct_Update_Sales instead of Account_Update_Process_For_Regional_Sales_Team_Final.
Whether you’re a brand-new admin feeling overwhelmed or a seasoned Flow pro, remember: Go back to the basics. Validate, add, test, and repeat. You’ll find the bug much faster by building it piece by piece rather than by trying to debug the whole masterpiece at once.
#TheMoreYouKnow (Cue the sound bite! 
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