It’s a limited amount of characters, I guess. Full descriptions are not shown when the tool is embedded.
Weird thing is that most pickaxes are OK - the description is shown correctly. But some pickaxesface this issue.
I already submitted another question/bug (it’s impossible to embed some pickaxes). Looks like V2 still has some unpredictable and surprising challenges 
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This it the intended behavior. The descriptions of Pickaxes are auto-truncated beyond a certain length so that they don’t look messy with super long text descriptions overlapping on top of other elements. We added this feature to protect users from un-intentionally creating messy embeds which we saw a lot.
The “…” is a clickable element that brings up the full description.
