A couple of the listed connectors are best-effort starting points, built from each tool's own published documentation rather than confirmed end-to-end against a real install. They're a real head start if you want to help finish one off, not a promise that everything already works.
One practical gap: a couple of these connectors have no structured way of reporting what they did back into DF Code, so a background Agent run through one of them may finish its work but show no visible result text in the conversation — the work still happened, it just isn't narrated back the same way Claude's runs are.
None of this affects the default connector — it only matters if you've deliberately picked one of the newer options for a specific reason.