Comment by robot-wrangler
5 days ago
Skills are like the "end-user" version of MCP at best, where MCP is for people building systems. Any other point of view raises a lot of questions.
Aren't skills really just a collection of tagged MCP prompts, config resources, and tools, except with more lock-in since only Claude can use it? About that "agent virtual environment" that runs the scripts.. how is it customized, and.. can it just be a container? Aren't you going to need to ship/bundle dependencies for the tools/libraries those skills require/reference, and at that point why are we avoiding MCP-style docker/npx/uvx again?
Other things that jump out are that skills are supposed to be "composable", yet afaik it's still the case that skills may not explicitly reference other skills. Huge limiting factors IMHO compared to MCP servers that can just use boring inheritance and composition with, you know, programming languages, or composition/grouping with namespacing and such at the server layer. It's unclear how we're going to extend skills, require skills, use remote skills, "deploy" reusable skills etc etc, and answering all these questions gets us most of the way back to MCP!
That said, skills do seem like a potentially useful alternate "view" on the same data/code that MCP is covering. If it really catches on, maybe we'll see skill-to-MCP converters for serious users that want to be able do the normal stuff (like scaling out, testing in isolation, doing stuff without being completely attached to the claude engine forever). Until there's interoperability I personally can't see getting interested though
There's no lock-in there.
Tell your agent of choice to read the preamble of all the documents in the skills directory, and tell it that when it has a task that matches one of the preambles, it should read the rest of the relevant file for full instructions.
There are far fewer dependencies for skills than for MCP. Even a model that knows nothing about tool use beyond how to run a shell command, and has no support for anything else can figure out skills.
I don't know what you mean regarding explicitly referencing other skills - Claude at least is smart enough that if you reference a skill that isn't even properly registered, it will often start using grep and find to hunt for it to figure out what you meant. I've seen this happen regularly while developing a plugin and having errors in my setup.
> There are far fewer dependencies for skills than for MCP.
This is wrong and an example magical thinking. AI obviously does not mean that you can ship/use software without addressing dependencies? See for example https://github.com/anthropics/skills/blob/main/slack-gif-cre... or worse, the many other skills that just punt on this and assume CLI tools and libraries are already available
It is categorically not wrong. With an MCP you have at a minimum all the same dependencies and on top of that a dependency on your agent supporting MCP. With skills, a lot of the time you don't need to ship code at all - just an explanation to the agent of how to use standard tools to access an API for example, but when you do need to ship code, you don't need to ship any more code than with an MCP.
The trivial evidence of this, is that if you have an MCP server available, the skill can simply explain to the agent how to use the MCP server, and so even the absolute worst case for skills is parity.