The ability to use a tool might depend on what you are using the tool for and if a skill is also appropriate, you get advantage if you are proficient in both.
To craft or patch something, DEX makes sense (different DCs depending on task). Identifying fabric/clothing would be INT.
It is up to the creativity of the player and the whims of the DM.
I tend to prefer Intelligence for crafting something completely new or out of an unfamiliar material, Intelligence or Wisdom for something new but very similar to something you've done before (so your experience fully matters), while for something familiar I'll usually allow a choice of INT/WIS or a relevant physical skill, whichever is higher.
In general I like to treat all ability checks (including tools) as a negotiation with the player; if they think a particular skill or ability score is relevant for their character, or they should get a bonus for their backstory, past experience etc. then I like them to suggest it. On this basis I prefer to avoid setting a specific check (unless there really is only one logical choice) but offer a few options and invite alternatives, within reason of course!
Plus it often actually makes DMing checks a little easier since you don't have to worry about picking the right check every time, just say "well this is quite an unusual material for you so it feels like Intelligence, do you agree?".
What skill check is the weaver's tools, and if it depends on the material, is it possible to weave spider silk?
Tool proficiencies are their own check in general, so I'm not sure what you mean by "what skill check" - they're tool checks, not skill checks, although both are ability checks. What will definitely depend on the material is which tool proficiency your DM chooses for a task (you are unlikely to use Weaver's Tools on stone or wood) and what may depend on the material is the DC (it may be more difficult to sew unicorn hair than alpaca hair). It should generally be possible to weave spider silk because it's trivial to do so in the real world, but for other things you expect the tool proficiency to do in the game that aren't weaving, like sewing, you should be able to do it, but your DM might rule you need pricier tools - spider silk is very strong and we lack real world referents for sewing it, so it's reasonable for your DM to assume you'll need an adamantite needle so you can press as hard as you need to without the needle bending, for example. Likewise, you might need a needle enchanted to touch the Ethereal Plane to sew Phase Spider silk.
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What skill check is the weaver's tools, and if it depends on the material, is it possible to weave spider silk?
Depends on your DM, crafting with weaver's tools, in my opinion, might either be DEX or INT.
Weaving spider silk should be totally possible.
Damn responding to me twice, thank you so much :)
The ability to use a tool might depend on what you are using the tool for and if a skill is also appropriate, you get advantage if you are proficient in both.
To craft or patch something, DEX makes sense (different DCs depending on task). Identifying fabric/clothing would be INT.
It is up to the creativity of the player and the whims of the DM.
I'd have weaving be a Dexterity (Weaver's Tools) check.
Xanathar's has some ideas about other uses for the proficiency rather than only actually performing weaving.
https://www.dndbeyond.com/sources/xgte/dungeon-masters-tools#WeaversTools
I tend to prefer Intelligence for crafting something completely new or out of an unfamiliar material, Intelligence or Wisdom for something new but very similar to something you've done before (so your experience fully matters), while for something familiar I'll usually allow a choice of INT/WIS or a relevant physical skill, whichever is higher.
In general I like to treat all ability checks (including tools) as a negotiation with the player; if they think a particular skill or ability score is relevant for their character, or they should get a bonus for their backstory, past experience etc. then I like them to suggest it. On this basis I prefer to avoid setting a specific check (unless there really is only one logical choice) but offer a few options and invite alternatives, within reason of course!
Plus it often actually makes DMing checks a little easier since you don't have to worry about picking the right check every time, just say "well this is quite an unusual material for you so it feels like Intelligence, do you agree?".
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Tool proficiencies are their own check in general, so I'm not sure what you mean by "what skill check" - they're tool checks, not skill checks, although both are ability checks. What will definitely depend on the material is which tool proficiency your DM chooses for a task (you are unlikely to use Weaver's Tools on stone or wood) and what may depend on the material is the DC (it may be more difficult to sew unicorn hair than alpaca hair). It should generally be possible to weave spider silk because it's trivial to do so in the real world, but for other things you expect the tool proficiency to do in the game that aren't weaving, like sewing, you should be able to do it, but your DM might rule you need pricier tools - spider silk is very strong and we lack real world referents for sewing it, so it's reasonable for your DM to assume you'll need an adamantite needle so you can press as hard as you need to without the needle bending, for example. Likewise, you might need a needle enchanted to touch the Ethereal Plane to sew Phase Spider silk.