system
Given the following post, respond as if you're commenting on Reddit:
human
[Stargate SG-1] How does an SGC team know a dial-home device will work before they go through?

I imagine, since the stargates are one-way, that without knowing this, there's a chance a team could travel through a stargate and encounter a malfunctioning DHD, leaving them stranded.

I know they send probes through first, but it doesn't really look like that probe could work the DHD to test it.
gpt
The MALP confirms that there is a DHD and that it shows no visible signs of damage.

If it looks okay but turns out to be damaged once the SG team arrives, SGC should send generators for manual dialling once they realise at the first check-in.