How much context is eaten up by skills that rehash what a SOTA model should already know?
Maybe token-wise, it's a wash: Elixir/OTP does a lot without third-party libs, which would require massive npm dependencies to achieve the same thing.
https://github.com/agoodway/.claude/blob/main/skills/elixir-...
There are papers showing that models follow instructions less the more instructions they have. Now you think about how many instructions are embedded in that MD + the system prompt + likely a local AGENTS.md and at the end there is probably very little here that matters.
https://github.com/agoodway/.claude/blob/main/agents/elixir-...