I don't like skills. It's a really annoying form of technical debt, especially when people try to fill up company repos with random skills they think are so cool. Same goes for polluting a repo with custom instructions.
I only want the model to have the tools it needs to get the job I ask of it done.
Skills are mostly snake oil, the way people use them (the aspiration to download kung foo from a celebrity).
There was a time when maybe it mattered (last year), but with good repos and good prompts today's agents can find exactly what they need without any skills.
"Skills" as developer macros can be useful, but at most those are things shared with the team (in the repo), not something you download from the internet. If you have so many skills that you feel the need to manage them, that's a code smell.
I think waaay more people struggle with this than HN would have you believe. In the real world, not everyone is a software dev with a developer mindset to using these tools. Normal people essentially type the equivalent of "Make me X!"
and complain when the model assumes anything in their underspecified mess of a prompt. There are skills like grill-me that can potentially help these people a lot, but in the end I believe models will just be smart enough to understand your level of knowledge and intent to do this stuff on their own. They are getting much better on pushing back on poor user input already. The problem is that when they double down on hallucinations (very rare nowadays but I still see it happen in enterprise projects with the latest models). So you kind of need to know when to push back on the model as well. But for that you have to be really good at the subject.
I tend to agree. Skill files become less useful as developer skill increases.
As a skilled developer my repetitive instructions are mostly one or two sentence phrases for staring something like a highly-interactive planning session, or a self-supervised implementation session with my preferred setup of implementation and review subagents. I can specify those out by hand, or save a couple keystrokes with a tiny skill file.
But if you are not a software dev you might lack the vocabulary to tell the agent what you want. If you don't know what tenant isolation is, chances are your app will have a broken security model because you can't ask for it, and probably won't think to ask the agent for a security review either. Skills can mitigate a lot here
If you are spending time on all text forums like this, you are likely a person whose skill set skews towards the verbalization of abstract concepts. This is also the exact skill set needed to use LLMs well. If you are able to articulate exactly what you want in a concise prompt, little else is needed.
I think we tend to overlook the fact that LLMs have tilted the scales heavily in favor of those with good verbal skills. A huge portion of the population (including a portion of highly skilled software engineers) is not great at doing this. For them, harness skills still act as a kind of scaffolding; they support automated work on a project in cases where insufficient details is given in the prompt.
The closest I get to finding skills useful is when I find myself repeating myself to an LLM. This tends to happen most when I am starting new projects and want to communicate basic design principles and patterns to follow and libraries to use. What I did was to factor and store these "chunks" of instruction in some text files. I then made a little script that can list what chunks are available and when given a subset will essentially `cat` the selected files to emit AGENTS.md content which I save into the new project or append to shore up an existing one.
Your observation on the readership bias of HN is a good one for people to add to their HUMANS.md before reading and commenting. :)
Where they are very useful is as a documentation source for LLMs. For example, I work in infosec and often have to reference DSLs (Cobalt Strike aggressor script for example). Having a skill which is an offline index to carved up function docs, which an LLM can use without having to think, then search for, then download huge 1 page documents with all function documentation, and pollute the context… very useful.
Yes, skills as a "portable power" isn't really the use case for me unless it's entirely generic and even then sparingly.
I've mostly followed what anthropic suggests, which is putting less into context and more into skills, to keep the "how" out of context until it is needed to reduce context bloat.
Skills have some instructions but are primarily informed repo specific instructions and keep their context away from the rest of the repo to keep things sanitised for me.
> Skills have some instructions but are primarily informed repo specific instructions and keep their context away from the rest of the repo to keep things sanitised for me.
Skills and agents in the Claude world can also be extended and evolved over time, as they are committed "code".
For example, we have an agent which can take a statement or a support ticket and identifies the services, tenants and infrastructure components likely meant in the ticket or request. Similar to a skill, Claude can invoke this on demand in a conversation.
This started very simple, but various people spent time tuning it over the last 4-6 months. They have "taught" it to pick up on jargon from different departments, writing style of different departments, how they think about their systems.
With all of that tuning over time it has become quite "clever" in identifying the mentioned systems and - if requested - the train of thought leading to this conclusion.
Similar things are happening with skills for various task, be it Ansible integration tests, upgrade chores and so on. The first version can be fairly underwhelming, but continuously improving it after each usage can make them very powerful.
I find them useful for deploying task specific agents, like reviewing Jira tickets, or otherwise ensuring compliance in open format submissions.
Otherwise I agree, and you don't even have to be that verbose with prompt engineering these days as LLMs have gotten increasingly good at figuring out what you want.
i agree, skills downloaded from the internet are all snake oil.
creating your own skills however good for both reducing the token usage & increasing reliability. those damn llms are not deterministic, asking same thing twice produces 2 different results.
- Keep them organised in software repos that you install with symlinks for all coding harnesses that you have. Progressive disclosure based on the frontmatter does the rest.
- I make sure they work with AI evals. Think of them like integration tests to prove behaviour. They're useful to optimize your flows. I try to make my skills be mostly a translation between natural language and good small fast tools that they call.
- I change them as a new problem arises. Not just because.
Skills can't be eaten by model capabilities if skills represent a workflow that is custom to my team or my person.
People always say this about the evals, but I find it hard to have a practical implementation of such a thing where you won’t end up spending 100x the amount of time on the evals than building the skill itself.
Like, ok, I have a debugging skill, now how do I make evals except for the most trivial things?
You don't. If you're using skills to force the AI to fullfill some must criterias, it's not going to work. Must criterias need deterministic checks -> be it hooks or what not.
This is also my biggest gripe with AI. I.e. for specifications, no matter what hype machine I tried, it never fulfilled my criterias, which are: easily verifiable, concise, small specs. Hence I built https://github.com/RicardoMonteiroSimoes/Yamlet initially for claude code, but then decided to use extend it for pi.dev. I now have a dedicated docker image for pi.dev, that only contains Yamlet plugin, and whenever I work on spec I spin it up.
The end result is a .yaml file that easily works in git + git diff, so that I can then proceed with the technical specs-
Why do you have a debugging skill? Just tell it to read the docs.
Skills are for packaging instructions for how to interact with your organizations homebrew process and tools. By definition skills shouldn’t be useful outside of your org because they’re just docs and third party tools already have them for humans.
There are also skills that help LLM do the thing it can do without the skill, but faster (by cutting out unnecessary discovery). I guess for such skills the fail case is "being slow"?
I imagine many fail cases can burn a lot of tokens/usage/time because failing LLMs can be very persistent. Maybe some upper bound (turn count, timeout) would help too.
Big yes on this. I do not understand the appeal of skill shopping. The one exception I have is things like the Axiom Apple development skills and e.g. the official Flutter skills. At that point the skills are just docs though. It's either I remember to paste a URL to the official docs or I just install the skill. But shopping around for random skills just sounds extremely unappealing.
Surprised it has not been mentioned, but I think relying on https://github.com/vercel-labs/skills is sound. It handles global installs for a wide range of coding agents. If I was working on an internal only skill I'd probably still use the same foundation.
Never understood the “skills” part tbh. Thse models are being trained in trillions of texts. Adding something small and particular about my codebase doesn’t really move the needle
I don't use any skills, what kinds of skills are people finding most useful?
For general tasks, the model seems perfectly capable of figuring out things itself, for project or environment specific tasks, I just put that information in the readme or agents.md file.
I make skills for «this is how I like to do things in this company / project». Query test database, git branch names, commit message style, which cloud things can be inspected like logs etc. I don’t see the point in trying to teach the models things that is in the documentation of git, python, what have you. They already know.
I try to keep agents/Claude.md as tiny as possible. With high level "truths" that don't change. Stack used, invariants, file structure, and some scripts.
Skills are more for things you do often. I run mutation tests, type check,linting,etc. I _could_ just prompt and copy/paste the same prompt each time I need to, or I can just run /tests.
I also have skills for specialized tasks I need every once in a while, like a ux skill, a text skill optimized for xyz, etc.
Depends on how much information and details you have. The agents.md always goes into context. Detailed testing or process information might be excessive, when agent is working on UI. Skills are pulled when needed.
I handle the context problem by splitting the details to dozens of small md files. Agents.md acts as a router that directs the llm to correct documentation file/folder according to the task at hand.
This documentation is its own git repo, and the agents.md file has an explicit instruction to update the docs when it has learned something general that can be useful in future sessions. I then occasionally review and prune those docs.
The description in the front-matter (at the top of the skill markdown file) is the only thing in the context and used by the agent to determine when to read in the rest of the skill file.
Your agents.md is a good place for high level facts, but if you have something that requires a lot of info to explain (ie: if there is a complex build process, testing patterns, things like that), loading up your agents.md for every request may be a bad idea. Offloading that information to a skill ensures it's only included in the context if you're actually using it.
How about linking to a separate docs file from the Readme, same as how you'd split separate topics into different files for humans? The context cost is low and as far as I can tell it's pretty much how Claude's "memory" feature works.
That splitting is basically what a skill is, with some instructions as to when to load it. Depending on the harness used it might be quite equivalent, but not sure how easy it follows links in the readme compared to skills (which is just a glorified name of a readme anyways)
Right, it's all just text file management. My point is that if I can add a few lines of description with links in my readme/agents/etc instead of manually including skills in the prompt, without any downside, I'd rather do that.
I use skills for offloading work onto subagents. By configuring the skill to use a specific model it gets enforced at the harness instead of depending on the good will of the orchestrating model to actually delegate. This also saves context.
Today Fable had to fetch a zip file from a web page with a eula prompt, then get at a file in a disk image in the zip.
This is something that will need to happen a lot as part of this project.
I asked Fable for a skill/script combo suitable for Haiku to accomplish the task, and now that task happens at minimal cost during an analysis run.
I have a couple of skills with project-specific conventions for how to write a plan and how to write HTML-generating code. But they could probably just as well be .md files in a docs directory, linked to from the AGENTS.md file.
Well, for non-general tasks, of course. For example particular tooling that's required for the environment.
I will often make a skill out of the docs for any of the frameworks or libraries that we're using but with which I'm unfamiliar. When I'm creating that skill, I focus on idiomatic implementation and usage. It's not enough for the code to work—I want it to work "with the grain" and "through the front door", as it were.
By default, these models are just all too willing to reinvent the wheel and monkeypatch as they go.
Claude will do this for you after a few times. But yes, I have a skill called plan-to-epic which creates a Jira epic and ticket per milestone. It helps my agents persist context and, because I’m terrible at competing with my coworkers for “visibility,” means I can point to all my work if asked.
So the term used internally is to make things "Determinishtic". I use skills extensively, combined with SOPs, scripts and MCP servers.
An example skill I have is SessionMiner, which is installed via post session hooks in Claude and Kiro, and analyzes the session, what was accomplished, and whether or not it should be turned into a skill, then when it summarizes it, the decisions it came to and either fires off a message to me for followup if it decides a new skill or tool should be built, or it catalogues the approach so that future analysis can identify trends in how I use the tools.
Over time it has built me a fairly decent stable of repeatable skills and tools, and highlighted process deficiencies and nominated process changes that I have pursued.
Another skill is a communications analysis skill; I started using it summer last year I think, and it scans my communications across a broad cross-section of my activity online. It tracks the commitments I make, ensures that I follow up with people that I might miss, ranks and scores my communication against my own personal targets that I set to make sure that I am communicating effectively. As a person who has had a decently successful career despite autism spectrum and unmedicated ADHD (I was medicated, but unfortunately each medication I tried had adverse side effects), it has made me much more effective in tracking work and following through, especially on the "boring" stuff that is actually critical to being a dependable team member, and effective partner for the teams I support.
You're putting a lot of trust into the judgement abilities of what is just a next token predictor there.
I can see what the goals are there, and they do make sense I suppose, but I'm not confident that what you're handing off there can be handed off to that degree.
But maybe that is not the point and the point instead is to see what the LLM thinks would be correct, and then think about that and collect learnings about the world from it.
It might not be right, but it still tells you how normal people think. So that's useful.
Just a very roundabout way to achieve that, but that's fine, I guess.
> I don't use any skills, what kinds of skills are people finding most useful?
I create/edit/delete at least one skill per day. I can't imagine working effectively without those files.
The most common case: if I see something took AI too much time and tokens and it is done, I ask my Cursor immedietly after to save it as skill. So next time I do the same I just refer to skill. I don't need to remember the name of the skill, I just mention something like "do {explaining briefly the task}, you have done something similar in the past and it is saved as skill"
One way I use skills, which I don’t see mentioned very often, is as “shortcuts”. Imagine some frequently issued prompt like “fetch origin and rebase this branch onto origin/master and resolve conflicts”. I make that into a little skills file called “rebase” with a one sentence description, and next time just type something like “/reb-tab-enter”.
Personally I have found "meta-prompting" to be much more useful than any pre-canned set of skills. Simply ask the AI (inside of a workspace already set up):
Create a standalone prompt to <xyz>
The latest AIs will print out a long prompt with all of the assumptions, tools, and general files it plans to use. Review that, and then run the whole prompt in a new context.
Last week I had to reuse homemade skills on different project. I very much liked the AI proposed solution and it works quite well: ship as a plugin and add your git repo as a marketplace.
The installation is effortless and I don't have to mess with symlinks as I may be working with same codebase on different platforms which would make things.. different.
codex plugin marketplace add "https://path-to-my-git-repo"
codex plugin add agent-tools@mycompany
claude plugin marketplace add "https://path-to-my-git-repo"
claude plugin install agent-tools@mycompany
Let the AI generate .json files for marketplace.
Haven't got to these bits yet, but I'm sure they will work as easy as install does.
claude plugin marketplace update mycompany
claude plugin update agent-tools@mycompany
I don’t seem much point to intentionally curating a set of skills, and specifically invoking them by name, only to watch the ai skip them all and do better by just reading code and internal/external websites.
I've got a skill repository on github, and I got a hermes automation to sync skills repo - this hermes automation is on every device.
Any skills I make on the fly - my global AGENTS.md has instructions to update the skills repo path and place them appropriately in there.
for skills related to specific cli tools, i just wrote a standard for this! it's obviously not widely used yet, but since mise will support installing the skills alongside the tool, i suspect it will have decent adoption
i used to be a bit bearish on skills—thinking that llms should just use --help, but i've come around on that. i think skills are a great way to describe higher level workflows that use multiple commands.
When I work on a new problem and the agent struggles with it, I will ask the agent to distill the knowledge and experiences it gained during the session into a skill file. Then I review and publish it depends on the assistant system. I find this is an effective way for the agents to learn new skills, both from its own discoveries but also from my steering and the mistakes it made.
If you work in a niche or on special problems, this template could be useful.
Nowadays I often create skills myself (or with the aid of coding assisants) for any repeating tasks. For example, I use my own skill to make Claude CLI send the worktree to codex cli for the review, then read the verdict and make changes
The internet has broken me. Whenever I see a question like this i now automatically expect it to be some marketing attempt. There will be a product/service/blog post somewhere in the comments.
I have created a little system for this, placed directly in the ~.<youragent>/skills folder.
I have a configuration file of marketplaces and other skills to fetch, it can look like. I have my own marketplaces as well, including ones from my company.
I use vercel's tool for managing skills with npx, but to easily handle specifically _which_ skills to fetch, the config file is set up as follows:
I don't use skills unless I have something specific to tell the agent. For example, if I want the agent to use Tailwind V3 instead of V4, I'll have a skill for that. Or, if I want the agent to always use the repository pattern for database access, I'll create a skill for that.
I don't need to manage skills files because I have so few of them and they're only a couple lines long.
5 Stages using local GIT (no remote, don't need it) to prevent preloading in the prompt:
1. A single Skill finder skill, loaded in the prompt, prevents having to import all the summaries in the prompt the harness would add. Uses git's own search.
2. Private repo, per agent, contains main (production) and draft-<name of skill> branches.
3. Shared repo, like 2, but general access for all group agents.
4. Fallback mode, search the harness for skills using the harness mechanism when a relevant skill cannot be found.
5. Skill audit cron. Identify junk skills / drafts that have never changed / not in any recent sessions history, and categorise monthly for me to decide.
This means it's compatible with existing skill folders, removal of git and the finder skill is non destructive and critically debloats the prompt of skills that aren't used and lazy loads them when needed.
I commit them to git(so complete team leverages them)., each repo has kind of different skills and the skills are the ones which I update at least twice a week. I’ve skills on how to add instrumentation , debug, code, code review, tech design review etc. I found most of the skills I find on skills.sh are not very useful for me., but I browse occasionally to get some inspiration. One more paradigm I’m seeing good results on adding new skills is ‘how to do X’, for instance ‘how to add logs’., “how to review code” etc., if i’m not able to frame it that way I don’t think it’s a good use case for me to add that skill to the llm arsenal.
Another thing i discovered is less is more (in case of skills as well)., don’t add lots of skills., keep them very handful - I’ve got 9 skills so far (many people have 100s installed from marketplaces and plugins)
Thats exactly how I use skills as well and I got great results with it.
I work in a proprietary codebase with a lot of niche or custom tooling, weird technical details and historical quirks.
What skills do for me, is essentially skip the "learning" phase of an agent working in the codebase.
With a fitting skill the agent does not need to read the tooling docs, look at existing repos and learn the coding style, but it can get to work immediately.
This is probably less relevant for code that exists a ton in the LLM training data already as an llm is probably competent to some degree in that anyway.
A big caveat here is though that now you need to treat your skills repo very carefully as mistakes in there can easily spread to all of the new code you write using a coding agent.
To the extent that skills are contextual guidance (for this author, this project, etc) and not just (raw) capabilities they are unlikely to be eaten by models.
I maintain all my skill files in a central location (like dotfile management) and have guix home sync it to the skill folders of various harnesses that I'm playing with (codex, pi, antigravity, Claude Code, Deepseek harness, etc). They're set up to be bidirectional links rather than read-only like the default configuration, so I can keep editing them / adding to the corpus from any harness.
This works well for skills since all harnesses expect the same format, but is more annoying for other features.
EDIT: This is actually an example of a potentially useful skill. You might choose to manage your skills slightly differently. All you need to do is write a skill-management skill for your agents to be able to wire things up correctly / access them for edits.
Some other nifty skills/plugins in my experience: render latex equations, cetz diagrams inline, jujutsu, guix, code reviewer, writing feedback.
I manage them as part of my dotfiles using chezmoi. A `.agents/skills/` directory + a symlink to there from `.claude/skills/`.
> Do you keep improving them over time?
In my global AGENTS.md I have a note to agents to explain any frustrations they had doing a task, and to suggest any skill/tool/AGENTS.md improvements. I am trying to keep AGENTS.md files small but still finding the balance.
Skills that are so generic that you can find them on the internet, and which you think can be replaced by model improvements, are useless, possibly even harmful, considering how much the models get clingy to the context. Useful skills describe workflows specific to your project, and they can live in the project repo for everyone to use and improve.
I'm on mobile but the first skill I made was a skill improvement skill. This is basically stating that if the AI struggles in another skill but finds a way that the skill it used needs reworking and it needs to do so.
There is a rule to always use this skill and then track notes in a version file. Then back it up in a share folder or external drive.
Skills have made my tools immensely better, cheaper to use and faster. I've also added to it that it should write scripts it can just use in the future to do tasks like query information it needs to answer questions.
I wish there was a better way to share these over a team but I haven't taken that time yet.
The main problem I encountered around this is that skills need to be edited across projects and across team members in a controlled way. Git is of course required for this but is not enough so I built a tool to do just that:
Skills live in two source-of-truth git repos (private and public). Agents edit skills by my request, and syncs to all coding agents ~/.claude/skills/, ~/.codex/skills, ~/.pi/agent/skills, ~/.config/opencode/skills etc. with agent written sync-agent-skill script. script ensures that no local changes was made in-place.
If I have a session with something that I expect to do it again, I ask Claude to make a skill out of it and store at user level somewhere at ~./claude/skills I think, so next time I can do just "/xyreport from-to" for example and dont have worry about leaving out things from the prompt or to rediscover some gotchas the agent ran into.
Everything is organised into repos, i select the directories with the context the agent needs for the task. If I want it to adjust something in my homelab, I drop it into the homelab repo. Stuff agents need to do commonly has shell scripts to speed it up.
I do however have some system prompts. I pick the prompt based on the goal, whether I want to implement something, or just web search, or just need a short one-off command to be done.
I’ve tried to keep up with “best practices” around AI use, but things are improving so quickly that I’ve largely given up. The vanilla agents are just fine for my needs as they come.
I run AI on my server. All skills and relevant info is saved to a Wiki. Agent only has an instruction to check the wiki (MCP) at the beginning and get the necessary context.
We keep the skills in a repo, where an agentic workflow runs biweekly to check if their content drifted compared to the docs and opens PRs if they did. The repo is also a Claude plugin. The biggest problem is keeping skills up to date across users, so I developed a small Go binary that takes care of that across harnesses.
I keep most of my sessions in Zed (you can import them there anyway). After some big feature I let a frontier agent go over these sessions and suggest improvements. Typically I use gemini for this because it's really good at pruning text. Claude/GPT really wants to append more text for some reason.
I end up with smaller skills but more "actioned" skills. They kind of force the agent to do things the way that works well.
Lookup the Claude managed agents architecture for skills, they have a kind of progressive exposure where skills have a title that triggers the skill, an index file that is loaded when triggered, and additional files and scripts that are available once triggered but not loaded by default.
For the my branch of the Norwegian Government we have a public skill registry and a tool to sync them locally according to what «profile» you select, https://ki-utvikling.nav.no/verktoy
I keep my skills in a Home Manager repo and install them into my .claude / .codex / whathaveyou directory through the home manager config. I'll know if they don't work because they are specific instructions on how to git commit, how to merge code, how to author text (without the typical AI tells), or API usage documentation for specific libraries, etc. If they didn't work the agent would do things incorrectly and I'd notice.
And sometimes it doesn't follow the instructions well. I have a skill for that too: it tells the agent, given what it knows about attention and LLM:s in general, to evaluate the instructions and the mistake the LLM made, try to diagnose why it didn't follow the instructions as expected, and come up with an improvement of the skill based on that diagnosis.
I have a repo/project called Loadouts & Summons. It has a primary skill, `capsule`.
All skills, MCPs, CLIs, etc. live inside of it. I have it symlinked to all my dev machines so that it doesn't have to be an MCP.
`capsule` is then progressive to dozens of skills/tools thru `capsule` -- ex. `$capsule plannotator [args]`.
In some harnesses, I make it human-invoke only, and call it directly. In others, I let the model invoke it, and it has a top-level description that hints at what's inside.
Maximal context/session start control and capability extension.
WTF is a "skill"? I really think people are getting ahead of themselves here.
You wrote some bullet points so your agent harness doesn't keep making builds in the wrong environment? You have a very specific debugging setup? Your agent doesn't understand when to rebase?
README is where you should be writing anything specific to your project, and if you're worried about context size then your README is too long, it should be just enough information for any competent dev or agent to get the gist of how you do things around here and where to look for deeper answers.
If your particular harness / orchestrator is just not pushing back enough or can't seem to solve certain problems then thats a tool issue, either edit the tool system prompts or move to better tools or models.
Calling this 'skills' is disingenuous, this word was chosen by marketers and implies some kind of deeper learning. I'm not saying there's no value in tuning prompts, but your 'skills' should be managed in only 2 ways: 1. It's specific to your project, it's a README, or 2. It's specific to your tooling, it's part of config, system prompts etc.
We have some company-managed skills, that help coding agents find the relationships between our repos, and our conventions, architecture, and other high-level decisions. These are supposed to be portable between agents, and so distributing them is currently awkward.
We have a bootstrap script to deploy company-managed skills to each developer's "personal" skills. Hooks for codex and claude code try to refresh the skills on each startup.
I recently completely overhauled repo’s skill setup.
I tried to control the execution of tasks performed by each project using claude.md within the project, but claude.md is only read at the beginning of each session, so it felt like the instructions weren’t being properly reflected.
So I revised the strategy to manage frequently used features in skill units. In doing so, instead of organizing skills by project, it was structured to be integrated into the general skills of the individual repo.
When skills are spread out across multiple projects and the number increases, it becomes impossible to keep track of which skills are available, so they end up not being used.
I also think that eventually, once Claude(model) advances, it will be able to replace most of the skills, so I believe registering and managing countless skills actually degrades performance.
the only ones {i use,claude decides to use} regularly come with claude code plugins so they automatically update. i just define the marketplaces and plugins in my .claude/settings.json for the project.
My agents use https://rcarmo.github.io/projects/memento/ to manage shared skills and propose changes. But I also have template projects with skills baked in for some scenarios.
Instead of managing skills as files, I have been using a simple utility which helps me create, update/attach skills and finally search it across sessions https://github.com/viggy28/recall/
I try to keep my collection of community skills short, usually a few established names (mattpocock, mcollina, trailsofbit). And then I check new releases (or when mattpocock published a youtube video for instance :D)
> keep them organized
For skills I wrote myself, I have my own private github repo. I use skills like /commands most of the time, so I can tell if they work straight away.
For community skills, a package manager really helps. vercel-labs/skills and withastro/rosie are good options. I also built one myself: https://github.com/osrim/ski. It has some cool features like an update command and a security scan.
>I believe skills will eventually be eating by model capabilities
a model capability is never going to fill in an unknowable blank that a custom skill (or whatever equivalent your paradigm supports) can.
a model might have the cleverness to whoami and look through the .ssh folder for keys and evidence of past connections when asked to connect to bob, but a skills file can just easily say "We connect to bob using key Z and user X." so that the operation gets done without all this nonsense needless inference as far into the future as the information is valid for.
a concise information dense skill is going to always dominate on tokens-burnt for any given task that requires insider knowledge. it simply gets rid of the entire investigative phase of work.
Agree here. My philosophy is the "general-purpose" coding agent will keep getting better and better, making skills less and less useful. And it will probably get better at a pace far greater than the customization folks can build around them via skills.
This of course is from my own experience writing code, where agents are already good at software engineering conventions. This probably doesn't hold as well for other tasks, say writing marketing copy with a unique voice
For now, I keep skills pretty minimal - single sentence prompts I send all the time, like "Remove all the slam poetry from the docs in this repo."
I also tend to share often. All skills go into a repo my team can access. No pressure, use them, riff on them, add your own - sharing and engaging on how we do the work is more important than making everyone do the work the same way to me.
What I meant by skills getting eating by models are the "general use" skills, like design critique, code review...ect
But, for custom use skills, ofc no model will be able to replace them and it's not efficient to try to do that as well. For this type of skills I create and maintain them by myself, my question was about "general use" skills, they are everywhere on the internet, how do you manage them?
Do you find any of the general use skills useful? I'm not sure I've ever used any of them, and when I've looked at them it's been some YouTuber trying to make money. That, and their Substack.
I know everyone's down on MCP, but custom-built client side MCP tools are what I find useful instead. But that's me.
If you can express something deterministically with code, it's better to do that rather than have an agent do it, because it's faster, cheaper, and deterministic. E.g. you regularly copy file A to file B. You can ask the agent to do it, or you can write a script and have the agent call the script via skill. That's the beginning of a harness.
Eventually you arrive at building custom software that does a lot in the traditional way, but delegates certain tasks to the model where it makes sense or it's non-trivial/impossible to express via code.
Why do you think like that?
"I believe skills will eventually be eating by model capabilities, but until then I'm just looking for a better way to manage things."
Skills is just a tech bro word for a simple markdown file with instructions.
No need to over complicate it. Write down things you feel like re-using. Like how to specifically implement something in your system ("when adding a new API endpoint we need to do x y and z", or "when making a github PR we tag Æ and Å") so you don't have to repeat it. And I mostly add it in cases where it didn't infer it itself. So very reactive, not proactive.
Most public skills are useless and over complicated. Lots of people are spending too much time on their harness, than actually making stuff.
Edit: but do get inspired by public ones. For instance a "grill me" skill can ve be useful, but I find the public one very mumbo-jumbo. But the idea of forcing the agent to ask clarifying questions is good.
I believe skills are much more than a simple markdown file with instructions. They are a very powerful script engine. How I organize it is that of course there's a markdown with instructions but I split the work in a hybrid of script + instructions. So all the work that can be deterministic is a python script api surface and all the logical or thinking work is in instructions. and agent is also instructed on how to use the api of the python helper functions. This makes it almost like a normal script but the runtime is a harness and the business logic can be any combination of code + human-level intelligence.
So I like to do all the edge case handling and validation etc via a helper function, and the agent is simply instructed to call the function to do something. It is extremely powerful and a completely different way of automating things. I am constantly forced to re-think how computers are supposed to work and its limitations.
Are there any "skills" at all that have proven to be useful?
And if so, what's the context?
Because, for me anyway, LLMs usually do one thing, and that then produces a durable artifact. So the prompt that got me there by that point expired and is not really needed anymore.
I also occasionally have recurring tasks (rarely though), but there, the prompt to do stuff is embedded in code that orchestrates the doing, so I have no use-case for that either.
___
For the "add this endpoint" example you've described, I just throw commit IDs at the clanker and say "go do that again". That works, and doesn't decouple knowledge from code.
I have my skills in my dotfiles repo, then symlink them to my home directory and/or projects where I want to use them. Project specific ones go into the project.
Not really related but I wonder how people benchmark the effectiveness of skills/agents?
I'm seeing the agent working quite fine with just direct prompting and the agent doing things by itself rather than using skills. Is it better for certain task size?
Don't find them. Ask the AI to do something. When it does it correctly, ask it to make a skill for it. Clear the session, try to use the skill, fix any problems found, modify your repo and harness if necessary. Repeat until skill works 0-shot. Improve with the same process.
This largely works with a specific model, specific harness, specific prompt, specific context. You may need to modify your agent harness to manage skills depending on runtime parameters. Pi is a great general purpose agent for the these modifications.
If you do find other skills and want to use them, put them through the loop above. But keep in mind that since they were created in their own circumstances, they may not work in yours.
Also separate rules from skills. Rules tell AI when to do things, skills tell AI how to do things. Tool call/MCP limitations, agent configurations, and harness extensions, can help it stay on track.
Agent can use mcp to update its own skills, or I can copy template skills into local dorectories via the api. Very useful, like notion on steroids but is completely free.
I wrote a small command-line tool that installs skill packs into agent-specific project folders. It works pretty much like `brew` (or any package manager, really). The skills are compiled into the binary so that I don't have to worry about where they're located and can quickly move the skills between machines by copying the tool.
Making sure they actually work? Trial and error, mostly. I know some folks have tried auto-researcher approaches, but I haven't found that to be the best use of time in my work.
I have been finding them decreasing in the effectiveness with each model release. We got rid of skills and built a determinist harness around the agent instead.
I don't like skills. It's a really annoying form of technical debt, especially when people try to fill up company repos with random skills they think are so cool. Same goes for polluting a repo with custom instructions.
I only want the model to have the tools it needs to get the job I ask of it done.
Skills are mostly snake oil, the way people use them (the aspiration to download kung foo from a celebrity).
There was a time when maybe it mattered (last year), but with good repos and good prompts today's agents can find exactly what they need without any skills.
"Skills" as developer macros can be useful, but at most those are things shared with the team (in the repo), not something you download from the internet. If you have so many skills that you feel the need to manage them, that's a code smell.
>but with good repos and good prompts
I think waaay more people struggle with this than HN would have you believe. In the real world, not everyone is a software dev with a developer mindset to using these tools. Normal people essentially type the equivalent of "Make me X!" and complain when the model assumes anything in their underspecified mess of a prompt. There are skills like grill-me that can potentially help these people a lot, but in the end I believe models will just be smart enough to understand your level of knowledge and intent to do this stuff on their own. They are getting much better on pushing back on poor user input already. The problem is that when they double down on hallucinations (very rare nowadays but I still see it happen in enterprise projects with the latest models). So you kind of need to know when to push back on the model as well. But for that you have to be really good at the subject.
I tend to agree. Skill files become less useful as developer skill increases.
As a skilled developer my repetitive instructions are mostly one or two sentence phrases for staring something like a highly-interactive planning session, or a self-supervised implementation session with my preferred setup of implementation and review subagents. I can specify those out by hand, or save a couple keystrokes with a tiny skill file.
But if you are not a software dev you might lack the vocabulary to tell the agent what you want. If you don't know what tenant isolation is, chances are your app will have a broken security model because you can't ask for it, and probably won't think to ask the agent for a security review either. Skills can mitigate a lot here
If you are spending time on all text forums like this, you are likely a person whose skill set skews towards the verbalization of abstract concepts. This is also the exact skill set needed to use LLMs well. If you are able to articulate exactly what you want in a concise prompt, little else is needed.
I think we tend to overlook the fact that LLMs have tilted the scales heavily in favor of those with good verbal skills. A huge portion of the population (including a portion of highly skilled software engineers) is not great at doing this. For them, harness skills still act as a kind of scaffolding; they support automated work on a project in cases where insufficient details is given in the prompt.
The closest I get to finding skills useful is when I find myself repeating myself to an LLM. This tends to happen most when I am starting new projects and want to communicate basic design principles and patterns to follow and libraries to use. What I did was to factor and store these "chunks" of instruction in some text files. I then made a little script that can list what chunks are available and when given a subset will essentially `cat` the selected files to emit AGENTS.md content which I save into the new project or append to shore up an existing one.
Your observation on the readership bias of HN is a good one for people to add to their HUMANS.md before reading and commenting. :)
Where they are very useful is as a documentation source for LLMs. For example, I work in infosec and often have to reference DSLs (Cobalt Strike aggressor script for example). Having a skill which is an offline index to carved up function docs, which an LLM can use without having to think, then search for, then download huge 1 page documents with all function documentation, and pollute the context… very useful.
Yes, skills as a "portable power" isn't really the use case for me unless it's entirely generic and even then sparingly.
I've mostly followed what anthropic suggests, which is putting less into context and more into skills, to keep the "how" out of context until it is needed to reduce context bloat.
Skills have some instructions but are primarily informed repo specific instructions and keep their context away from the rest of the repo to keep things sanitised for me.
I've found it to be useful in that context.
> Skills have some instructions but are primarily informed repo specific instructions and keep their context away from the rest of the repo to keep things sanitised for me.
Skills and agents in the Claude world can also be extended and evolved over time, as they are committed "code".
For example, we have an agent which can take a statement or a support ticket and identifies the services, tenants and infrastructure components likely meant in the ticket or request. Similar to a skill, Claude can invoke this on demand in a conversation.
This started very simple, but various people spent time tuning it over the last 4-6 months. They have "taught" it to pick up on jargon from different departments, writing style of different departments, how they think about their systems.
With all of that tuning over time it has become quite "clever" in identifying the mentioned systems and - if requested - the train of thought leading to this conclusion.
Similar things are happening with skills for various task, be it Ansible integration tests, upgrade chores and so on. The first version can be fairly underwhelming, but continuously improving it after each usage can make them very powerful.
I find them useful for deploying task specific agents, like reviewing Jira tickets, or otherwise ensuring compliance in open format submissions.
Otherwise I agree, and you don't even have to be that verbose with prompt engineering these days as LLMs have gotten increasingly good at figuring out what you want.
i agree, skills downloaded from the internet are all snake oil.
creating your own skills however good for both reducing the token usage & increasing reliability. those damn llms are not deterministic, asking same thing twice produces 2 different results.
100% - influencers pretend they know something and produce all in one skills pack - that doesn't make sense
- I don't find skills, I create them
- Keep them organised in software repos that you install with symlinks for all coding harnesses that you have. Progressive disclosure based on the frontmatter does the rest.
- I make sure they work with AI evals. Think of them like integration tests to prove behaviour. They're useful to optimize your flows. I try to make my skills be mostly a translation between natural language and good small fast tools that they call.
- I change them as a new problem arises. Not just because.
Skills can't be eaten by model capabilities if skills represent a workflow that is custom to my team or my person.
I wrote about a good mental model in the past:
https://alexhans.github.io/posts/series/evals/building-agent...
People always say this about the evals, but I find it hard to have a practical implementation of such a thing where you won’t end up spending 100x the amount of time on the evals than building the skill itself.
Like, ok, I have a debugging skill, now how do I make evals except for the most trivial things?
You don't. If you're using skills to force the AI to fullfill some must criterias, it's not going to work. Must criterias need deterministic checks -> be it hooks or what not.
This is also my biggest gripe with AI. I.e. for specifications, no matter what hype machine I tried, it never fulfilled my criterias, which are: easily verifiable, concise, small specs. Hence I built https://github.com/RicardoMonteiroSimoes/Yamlet initially for claude code, but then decided to use extend it for pi.dev. I now have a dedicated docker image for pi.dev, that only contains Yamlet plugin, and whenever I work on spec I spin it up.
The end result is a .yaml file that easily works in git + git diff, so that I can then proceed with the technical specs-
Why do you have a debugging skill? Just tell it to read the docs.
Skills are for packaging instructions for how to interact with your organizations homebrew process and tools. By definition skills shouldn’t be useful outside of your org because they’re just docs and third party tools already have them for humans.
A skill should only document behaviour the LLM didn't/couldn't exhibit on its own.
So you take your failed case (eg. working with gdb or whatever), write a skill and then test for that failed case.
There are also skills that help LLM do the thing it can do without the skill, but faster (by cutting out unnecessary discovery). I guess for such skills the fail case is "being slow"?
I imagine many fail cases can burn a lot of tokens/usage/time because failing LLMs can be very persistent. Maybe some upper bound (turn count, timeout) would help too.
Big yes on this. I do not understand the appeal of skill shopping. The one exception I have is things like the Axiom Apple development skills and e.g. the official Flutter skills. At that point the skills are just docs though. It's either I remember to paste a URL to the official docs or I just install the skill. But shopping around for random skills just sounds extremely unappealing.
I do both, or rather I do 'skill browsing', for new ideas to then evaluate the skill with my agent if they are useful. Most are not, but some I extract ideas from to augment my own skills https://github.com/flurdy/agent-skills/tree/main/skills#shar...
Though most of the time my skills are just things I found useful and could avoid repeating myself by having as a skill.
That I also use it to route model used with https://github.com/flurdy/pi-skill-model-router is also a reason
Surprised it has not been mentioned, but I think relying on https://github.com/vercel-labs/skills is sound. It handles global installs for a wide range of coding agents. If I was working on an internal only skill I'd probably still use the same foundation.
Never understood the “skills” part tbh. Thse models are being trained in trillions of texts. Adding something small and particular about my codebase doesn’t really move the needle
I think it's developers coping with not coding anymore.
There is this urge to create a non-ephemeral library of at least something.
I don't use any skills, what kinds of skills are people finding most useful?
For general tasks, the model seems perfectly capable of figuring out things itself, for project or environment specific tasks, I just put that information in the readme or agents.md file.
I make skills for «this is how I like to do things in this company / project». Query test database, git branch names, commit message style, which cloud things can be inspected like logs etc. I don’t see the point in trying to teach the models things that is in the documentation of git, python, what have you. They already know.
Isn’t that what the agents.md in your project is for?
I try to keep agents/Claude.md as tiny as possible. With high level "truths" that don't change. Stack used, invariants, file structure, and some scripts.
Skills are more for things you do often. I run mutation tests, type check,linting,etc. I _could_ just prompt and copy/paste the same prompt each time I need to, or I can just run /tests.
I also have skills for specialized tasks I need every once in a while, like a ux skill, a text skill optimized for xyz, etc.
Depends on how much information and details you have. The agents.md always goes into context. Detailed testing or process information might be excessive, when agent is working on UI. Skills are pulled when needed.
I handle the context problem by splitting the details to dozens of small md files. Agents.md acts as a router that directs the llm to correct documentation file/folder according to the task at hand.
This documentation is its own git repo, and the agents.md file has an explicit instruction to update the docs when it has learned something general that can be useful in future sessions. I then occasionally review and prune those docs.
That's exactly what skills do.
The description in the front-matter (at the top of the skill markdown file) is the only thing in the context and used by the agent to determine when to read in the rest of the skill file.
Skills are evaluated by short description whether to read them into context.
Skills itself may be lengthy so...
Your agents.md is a good place for high level facts, but if you have something that requires a lot of info to explain (ie: if there is a complex build process, testing patterns, things like that), loading up your agents.md for every request may be a bad idea. Offloading that information to a skill ensures it's only included in the context if you're actually using it.
How about linking to a separate docs file from the Readme, same as how you'd split separate topics into different files for humans? The context cost is low and as far as I can tell it's pretty much how Claude's "memory" feature works.
That splitting is basically what a skill is, with some instructions as to when to load it. Depending on the harness used it might be quite equivalent, but not sure how easy it follows links in the readme compared to skills (which is just a glorified name of a readme anyways)
Right, it's all just text file management. My point is that if I can add a few lines of description with links in my readme/agents/etc instead of manually including skills in the prompt, without any downside, I'd rather do that.
I use skills for offloading work onto subagents. By configuring the skill to use a specific model it gets enforced at the harness instead of depending on the good will of the orchestrating model to actually delegate. This also saves context.
Today Fable had to fetch a zip file from a web page with a eula prompt, then get at a file in a disk image in the zip.
This is something that will need to happen a lot as part of this project.
I asked Fable for a skill/script combo suitable for Haiku to accomplish the task, and now that task happens at minimal cost during an analysis run.
Did you consider writing a small Python script for that?
I have a couple of skills with project-specific conventions for how to write a plan and how to write HTML-generating code. But they could probably just as well be .md files in a docs directory, linked to from the AGENTS.md file.
Well, for non-general tasks, of course. For example particular tooling that's required for the environment.
I will often make a skill out of the docs for any of the frameworks or libraries that we're using but with which I'm unfamiliar. When I'm creating that skill, I focus on idiomatic implementation and usage. It's not enough for the code to work—I want it to work "with the grain" and "through the front door", as it were.
By default, these models are just all too willing to reinvent the wheel and monkeypatch as they go.
For starters, if you repeat a specific prompt multiple times per day, you may save it as a skill.
Claude will do this for you after a few times. But yes, I have a skill called plan-to-epic which creates a Jira epic and ticket per milestone. It helps my agents persist context and, because I’m terrible at competing with my coworkers for “visibility,” means I can point to all my work if asked.
So the term used internally is to make things "Determinishtic". I use skills extensively, combined with SOPs, scripts and MCP servers.
An example skill I have is SessionMiner, which is installed via post session hooks in Claude and Kiro, and analyzes the session, what was accomplished, and whether or not it should be turned into a skill, then when it summarizes it, the decisions it came to and either fires off a message to me for followup if it decides a new skill or tool should be built, or it catalogues the approach so that future analysis can identify trends in how I use the tools.
Over time it has built me a fairly decent stable of repeatable skills and tools, and highlighted process deficiencies and nominated process changes that I have pursued.
Another skill is a communications analysis skill; I started using it summer last year I think, and it scans my communications across a broad cross-section of my activity online. It tracks the commitments I make, ensures that I follow up with people that I might miss, ranks and scores my communication against my own personal targets that I set to make sure that I am communicating effectively. As a person who has had a decently successful career despite autism spectrum and unmedicated ADHD (I was medicated, but unfortunately each medication I tried had adverse side effects), it has made me much more effective in tracking work and following through, especially on the "boring" stuff that is actually critical to being a dependable team member, and effective partner for the teams I support.
Just a couple of examples.
You're putting a lot of trust into the judgement abilities of what is just a next token predictor there.
I can see what the goals are there, and they do make sense I suppose, but I'm not confident that what you're handing off there can be handed off to that degree.
But maybe that is not the point and the point instead is to see what the LLM thinks would be correct, and then think about that and collect learnings about the world from it. It might not be right, but it still tells you how normal people think. So that's useful.
Just a very roundabout way to achieve that, but that's fine, I guess.
It's not that, is for: Ensuring certain vetted implementation method is used. E.g. you always want tests or docs, or always done.
Caching certain scripts so it's not reinvented each time with risk of error/need reviewing.
> I don't use any skills, what kinds of skills are people finding most useful?
I create/edit/delete at least one skill per day. I can't imagine working effectively without those files.
The most common case: if I see something took AI too much time and tokens and it is done, I ask my Cursor immedietly after to save it as skill. So next time I do the same I just refer to skill. I don't need to remember the name of the skill, I just mention something like "do {explaining briefly the task}, you have done something similar in the past and it is saved as skill"
Gateway drug is “/grilling” by Matt Pocock.
One way I use skills, which I don’t see mentioned very often, is as “shortcuts”. Imagine some frequently issued prompt like “fetch origin and rebase this branch onto origin/master and resolve conflicts”. I make that into a little skills file called “rebase” with a one sentence description, and next time just type something like “/reb-tab-enter”.
Personally I have found "meta-prompting" to be much more useful than any pre-canned set of skills. Simply ask the AI (inside of a workspace already set up):
Create a standalone prompt to <xyz>
The latest AIs will print out a long prompt with all of the assumptions, tools, and general files it plans to use. Review that, and then run the whole prompt in a new context.
Last week I had to reuse homemade skills on different project. I very much liked the AI proposed solution and it works quite well: ship as a plugin and add your git repo as a marketplace.
The installation is effortless and I don't have to mess with symlinks as I may be working with same codebase on different platforms which would make things.. different.
Let the AI generate .json files for marketplace.Haven't got to these bits yet, but I'm sure they will work as easy as install does.
I don’t seem much point to intentionally curating a set of skills, and specifically invoking them by name, only to watch the ai skip them all and do better by just reading code and internal/external websites.
I've got a skill repository on github, and I got a hermes automation to sync skills repo - this hermes automation is on every device. Any skills I make on the fly - my global AGENTS.md has instructions to update the skills repo path and place them appropriately in there.
for skills related to specific cli tools, i just wrote a standard for this! it's obviously not widely used yet, but since mise will support installing the skills alongside the tool, i suspect it will have decent adoption
i used to be a bit bearish on skills—thinking that llms should just use --help, but i've come around on that. i think skills are a great way to describe higher level workflows that use multiple commands.
https://jdx.dev/posts/2026-09-05-introducing-packslip/
When I work on a new problem and the agent struggles with it, I will ask the agent to distill the knowledge and experiences it gained during the session into a skill file. Then I review and publish it depends on the assistant system. I find this is an effective way for the agents to learn new skills, both from its own discoveries but also from my steering and the mistakes it made.
If you work in a niche or on special problems, this template could be useful.
Nowadays I often create skills myself (or with the aid of coding assisants) for any repeating tasks. For example, I use my own skill to make Claude CLI send the worktree to codex cli for the review, then read the verdict and make changes
We have an ongoing discussion and some fans of https://microsoft.github.io/apm/
Because it's from Microsoft and sounds sufficiently enterprisey probably.
Here's how I do it:
- Explanation: https://www.minid.net/2026/7/14/how-to-automatise-with-ai
- Git source: https://github.com/meerita/monorepo-nextjs-golang-rust-pytho...
The internet has broken me. Whenever I see a question like this i now automatically expect it to be some marketing attempt. There will be a product/service/blog post somewhere in the comments.
I have created a little system for this, placed directly in the ~.<youragent>/skills folder.
I have a configuration file of marketplaces and other skills to fetch, it can look like. I have my own marketplaces as well, including ones from my company. I use vercel's tool for managing skills with npx, but to easily handle specifically _which_ skills to fetch, the config file is set up as follows:
from there I simply run "skills.py" (a single helper) to clean/fetch updated versions of the skills.I don't use skills unless I have something specific to tell the agent. For example, if I want the agent to use Tailwind V3 instead of V4, I'll have a skill for that. Or, if I want the agent to always use the repository pattern for database access, I'll create a skill for that.
I don't need to manage skills files because I have so few of them and they're only a couple lines long.
5 Stages using local GIT (no remote, don't need it) to prevent preloading in the prompt:
1. A single Skill finder skill, loaded in the prompt, prevents having to import all the summaries in the prompt the harness would add. Uses git's own search.
2. Private repo, per agent, contains main (production) and draft-<name of skill> branches.
3. Shared repo, like 2, but general access for all group agents.
4. Fallback mode, search the harness for skills using the harness mechanism when a relevant skill cannot be found.
5. Skill audit cron. Identify junk skills / drafts that have never changed / not in any recent sessions history, and categorise monthly for me to decide.
This means it's compatible with existing skill folders, removal of git and the finder skill is non destructive and critically debloats the prompt of skills that aren't used and lazy loads them when needed.
I commit them to git(so complete team leverages them)., each repo has kind of different skills and the skills are the ones which I update at least twice a week. I’ve skills on how to add instrumentation , debug, code, code review, tech design review etc. I found most of the skills I find on skills.sh are not very useful for me., but I browse occasionally to get some inspiration. One more paradigm I’m seeing good results on adding new skills is ‘how to do X’, for instance ‘how to add logs’., “how to review code” etc., if i’m not able to frame it that way I don’t think it’s a good use case for me to add that skill to the llm arsenal.
Another thing i discovered is less is more (in case of skills as well)., don’t add lots of skills., keep them very handful - I’ve got 9 skills so far (many people have 100s installed from marketplaces and plugins)
Thats exactly how I use skills as well and I got great results with it. I work in a proprietary codebase with a lot of niche or custom tooling, weird technical details and historical quirks. What skills do for me, is essentially skip the "learning" phase of an agent working in the codebase. With a fitting skill the agent does not need to read the tooling docs, look at existing repos and learn the coding style, but it can get to work immediately.
This is probably less relevant for code that exists a ton in the LLM training data already as an llm is probably competent to some degree in that anyway.
A big caveat here is though that now you need to treat your skills repo very carefully as mistakes in there can easily spread to all of the new code you write using a coding agent.
To the extent that skills are contextual guidance (for this author, this project, etc) and not just (raw) capabilities they are unlikely to be eaten by models.
I maintain all my skill files in a central location (like dotfile management) and have guix home sync it to the skill folders of various harnesses that I'm playing with (codex, pi, antigravity, Claude Code, Deepseek harness, etc). They're set up to be bidirectional links rather than read-only like the default configuration, so I can keep editing them / adding to the corpus from any harness.
This works well for skills since all harnesses expect the same format, but is more annoying for other features.
EDIT: This is actually an example of a potentially useful skill. You might choose to manage your skills slightly differently. All you need to do is write a skill-management skill for your agents to be able to wire things up correctly / access them for edits.
Some other nifty skills/plugins in my experience: render latex equations, cetz diagrams inline, jujutsu, guix, code reviewer, writing feedback.
I manage them as part of my dotfiles using chezmoi. A `.agents/skills/` directory + a symlink to there from `.claude/skills/`.
> Do you keep improving them over time?
In my global AGENTS.md I have a note to agents to explain any frustrations they had doing a task, and to suggest any skill/tool/AGENTS.md improvements. I am trying to keep AGENTS.md files small but still finding the balance.
Skills that are so generic that you can find them on the internet, and which you think can be replaced by model improvements, are useless, possibly even harmful, considering how much the models get clingy to the context. Useful skills describe workflows specific to your project, and they can live in the project repo for everyone to use and improve.
I'm on mobile but the first skill I made was a skill improvement skill. This is basically stating that if the AI struggles in another skill but finds a way that the skill it used needs reworking and it needs to do so.
There is a rule to always use this skill and then track notes in a version file. Then back it up in a share folder or external drive.
Skills have made my tools immensely better, cheaper to use and faster. I've also added to it that it should write scripts it can just use in the future to do tasks like query information it needs to answer questions.
I wish there was a better way to share these over a team but I haven't taken that time yet.
The main problem I encountered around this is that skills need to be edited across projects and across team members in a controlled way. Git is of course required for this but is not enough so I built a tool to do just that:
https://github.com/genged/capshelf
Using capshelf I manage my skills across projects. When I start a new project I can just:
$ capshelf add security-review
From the skill repo.
And if I create a new skill I can promote it to the repo so everyone can install it:
$ capshelf promote security-review
It pins the skill content hash so there are no unexpected edits that can break your flow. It also supports MCP configs and agent configs.
Skills live in two source-of-truth git repos (private and public). Agents edit skills by my request, and syncs to all coding agents ~/.claude/skills/, ~/.codex/skills, ~/.pi/agent/skills, ~/.config/opencode/skills etc. with agent written sync-agent-skill script. script ensures that no local changes was made in-place.
Codex and Claude Code both respect ~/.agents/skills; you don't need to have ~/.codex/skills and ~/.claude/skills .
Why do you use so many different agents if I may ask?
I mainly use Claude Code, but I had an idea to build an orchestrator for coding agents, so I experimented with several
If I have a session with something that I expect to do it again, I ask Claude to make a skill out of it and store at user level somewhere at ~./claude/skills I think, so next time I can do just "/xyreport from-to" for example and dont have worry about leaving out things from the prompt or to rediscover some gotchas the agent ran into.
I don't use them.
Everything is organised into repos, i select the directories with the context the agent needs for the task. If I want it to adjust something in my homelab, I drop it into the homelab repo. Stuff agents need to do commonly has shell scripts to speed it up.
I do however have some system prompts. I pick the prompt based on the goal, whether I want to implement something, or just web search, or just need a short one-off command to be done.
I’ve tried to keep up with “best practices” around AI use, but things are improving so quickly that I’ve largely given up. The vanilla agents are just fine for my needs as they come.
Can you elaborate more how do you setup vanilla agents ? Which agents you use and which use case that it’s greatly show benefit for you. Thanks
I run AI on my server. All skills and relevant info is saved to a Wiki. Agent only has an instruction to check the wiki (MCP) at the beginning and get the necessary context.
I am testing out Skillshare https://skillshare.runkids.cc and I am using skills.sh to find skills.
You can have your own skill repository with Skillshare and sync across agents (symlinks or copys).
We keep the skills in a repo, where an agentic workflow runs biweekly to check if their content drifted compared to the docs and opens PRs if they did. The repo is also a Claude plugin. The biggest problem is keeping skills up to date across users, so I developed a small Go binary that takes care of that across harnesses.
That's very cool. How does the binary keep skills updated across users?
It clones the skills repo if not present and relies on the git last commit as the "version".
I create and refine my own skills and commit them to my dotfiles repository.
Disclaimer: I hand curate them in the end
I keep most of my sessions in Zed (you can import them there anyway). After some big feature I let a frontier agent go over these sessions and suggest improvements. Typically I use gemini for this because it's really good at pruning text. Claude/GPT really wants to append more text for some reason.
I end up with smaller skills but more "actioned" skills. They kind of force the agent to do things the way that works well.
Lookup the Claude managed agents architecture for skills, they have a kind of progressive exposure where skills have a title that triggers the skill, an index file that is loaded when triggered, and additional files and scripts that are available once triggered but not loaded by default.
For the my branch of the Norwegian Government we have a public skill registry and a tool to sync them locally according to what «profile» you select, https://ki-utvikling.nav.no/verktoy
Source at navikt/copilot
I keep my skills in a Home Manager repo and install them into my .claude / .codex / whathaveyou directory through the home manager config. I'll know if they don't work because they are specific instructions on how to git commit, how to merge code, how to author text (without the typical AI tells), or API usage documentation for specific libraries, etc. If they didn't work the agent would do things incorrectly and I'd notice.
And sometimes it doesn't follow the instructions well. I have a skill for that too: it tells the agent, given what it knows about attention and LLM:s in general, to evaluate the instructions and the mistake the LLM made, try to diagnose why it didn't follow the instructions as expected, and come up with an improvement of the skill based on that diagnosis.
I have a repo/project called Loadouts & Summons. It has a primary skill, `capsule`.
All skills, MCPs, CLIs, etc. live inside of it. I have it symlinked to all my dev machines so that it doesn't have to be an MCP.
`capsule` is then progressive to dozens of skills/tools thru `capsule` -- ex. `$capsule plannotator [args]`.
In some harnesses, I make it human-invoke only, and call it directly. In others, I let the model invoke it, and it has a top-level description that hints at what's inside.
Maximal context/session start control and capability extension.
WTF is a "skill"? I really think people are getting ahead of themselves here.
You wrote some bullet points so your agent harness doesn't keep making builds in the wrong environment? You have a very specific debugging setup? Your agent doesn't understand when to rebase?
README is where you should be writing anything specific to your project, and if you're worried about context size then your README is too long, it should be just enough information for any competent dev or agent to get the gist of how you do things around here and where to look for deeper answers.
If your particular harness / orchestrator is just not pushing back enough or can't seem to solve certain problems then thats a tool issue, either edit the tool system prompts or move to better tools or models.
Calling this 'skills' is disingenuous, this word was chosen by marketers and implies some kind of deeper learning. I'm not saying there's no value in tuning prompts, but your 'skills' should be managed in only 2 ways: 1. It's specific to your project, it's a README, or 2. It's specific to your tooling, it's part of config, system prompts etc.
We have some company-managed skills, that help coding agents find the relationships between our repos, and our conventions, architecture, and other high-level decisions. These are supposed to be portable between agents, and so distributing them is currently awkward.
We have a bootstrap script to deploy company-managed skills to each developer's "personal" skills. Hooks for codex and claude code try to refresh the skills on each startup.
I recently completely overhauled repo’s skill setup.
I tried to control the execution of tasks performed by each project using claude.md within the project, but claude.md is only read at the beginning of each session, so it felt like the instructions weren’t being properly reflected.
So I revised the strategy to manage frequently used features in skill units. In doing so, instead of organizing skills by project, it was structured to be integrated into the general skills of the individual repo.
When skills are spread out across multiple projects and the number increases, it becomes impossible to keep track of which skills are available, so they end up not being used.
I also think that eventually, once Claude(model) advances, it will be able to replace most of the skills, so I believe registering and managing countless skills actually degrades performance.
the only ones {i use,claude decides to use} regularly come with claude code plugins so they automatically update. i just define the marketplaces and plugins in my .claude/settings.json for the project.
My agents use https://rcarmo.github.io/projects/memento/ to manage shared skills and propose changes. But I also have template projects with skills baked in for some scenarios.
Instead of managing skills as files, I have been using a simple utility which helps me create, update/attach skills and finally search it across sessions https://github.com/viggy28/recall/
> How do you find skills
I try to keep my collection of community skills short, usually a few established names (mattpocock, mcollina, trailsofbit). And then I check new releases (or when mattpocock published a youtube video for instance :D)
> keep them organized
For skills I wrote myself, I have my own private github repo. I use skills like /commands most of the time, so I can tell if they work straight away.
For community skills, a package manager really helps. vercel-labs/skills and withastro/rosie are good options. I also built one myself: https://github.com/osrim/ski. It has some cool features like an update command and a security scan.
by not having them at all.
>I believe skills will eventually be eating by model capabilities
a model capability is never going to fill in an unknowable blank that a custom skill (or whatever equivalent your paradigm supports) can.
a model might have the cleverness to whoami and look through the .ssh folder for keys and evidence of past connections when asked to connect to bob, but a skills file can just easily say "We connect to bob using key Z and user X." so that the operation gets done without all this nonsense needless inference as far into the future as the information is valid for.
a concise information dense skill is going to always dominate on tokens-burnt for any given task that requires insider knowledge. it simply gets rid of the entire investigative phase of work.
Agree here. My philosophy is the "general-purpose" coding agent will keep getting better and better, making skills less and less useful. And it will probably get better at a pace far greater than the customization folks can build around them via skills.
This of course is from my own experience writing code, where agents are already good at software engineering conventions. This probably doesn't hold as well for other tasks, say writing marketing copy with a unique voice
For now, I keep skills pretty minimal - single sentence prompts I send all the time, like "Remove all the slam poetry from the docs in this repo."
I also tend to share often. All skills go into a repo my team can access. No pressure, use them, riff on them, add your own - sharing and engaging on how we do the work is more important than making everyone do the work the same way to me.
How do you disseminate that information to humans?
What I meant by skills getting eating by models are the "general use" skills, like design critique, code review...ect
But, for custom use skills, ofc no model will be able to replace them and it's not efficient to try to do that as well. For this type of skills I create and maintain them by myself, my question was about "general use" skills, they are everywhere on the internet, how do you manage them?
Do you find any of the general use skills useful? I'm not sure I've ever used any of them, and when I've looked at them it's been some YouTuber trying to make money. That, and their Substack.
I know everyone's down on MCP, but custom-built client side MCP tools are what I find useful instead. But that's me.
“ determinist harness around the agent ”
Can you explain what this means?
If you can express something deterministically with code, it's better to do that rather than have an agent do it, because it's faster, cheaper, and deterministic. E.g. you regularly copy file A to file B. You can ask the agent to do it, or you can write a script and have the agent call the script via skill. That's the beginning of a harness.
Eventually you arrive at building custom software that does a lot in the traditional way, but delegates certain tasks to the model where it makes sense or it's non-trivial/impossible to express via code.
Why do you think like that? "I believe skills will eventually be eating by model capabilities, but until then I'm just looking for a better way to manage things."
Skills is just a tech bro word for a simple markdown file with instructions.
No need to over complicate it. Write down things you feel like re-using. Like how to specifically implement something in your system ("when adding a new API endpoint we need to do x y and z", or "when making a github PR we tag Æ and Å") so you don't have to repeat it. And I mostly add it in cases where it didn't infer it itself. So very reactive, not proactive.
Most public skills are useless and over complicated. Lots of people are spending too much time on their harness, than actually making stuff.
Edit: but do get inspired by public ones. For instance a "grill me" skill can ve be useful, but I find the public one very mumbo-jumbo. But the idea of forcing the agent to ask clarifying questions is good.
I believe skills are much more than a simple markdown file with instructions. They are a very powerful script engine. How I organize it is that of course there's a markdown with instructions but I split the work in a hybrid of script + instructions. So all the work that can be deterministic is a python script api surface and all the logical or thinking work is in instructions. and agent is also instructed on how to use the api of the python helper functions. This makes it almost like a normal script but the runtime is a harness and the business logic can be any combination of code + human-level intelligence.
So I like to do all the edge case handling and validation etc via a helper function, and the agent is simply instructed to call the function to do something. It is extremely powerful and a completely different way of automating things. I am constantly forced to re-think how computers are supposed to work and its limitations.
My genuine question is:
Are there any "skills" at all that have proven to be useful? And if so, what's the context?
Because, for me anyway, LLMs usually do one thing, and that then produces a durable artifact. So the prompt that got me there by that point expired and is not really needed anymore.
I also occasionally have recurring tasks (rarely though), but there, the prompt to do stuff is embedded in code that orchestrates the doing, so I have no use-case for that either.
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For the "add this endpoint" example you've described, I just throw commit IDs at the clanker and say "go do that again". That works, and doesn't decouple knowledge from code.
I use an agent plugin spec repo. Codex is already compatible with it and it supports skills + MCP definitions.
https://agent-plugins.org/
I have my skills in my dotfiles repo, then symlink them to my home directory and/or projects where I want to use them. Project specific ones go into the project.
I have a separate repo which has to be pulled locally and the skills and agents are sym linked to projects.
Openspec has a subcommand (init) to manage them: clever because they provide also an update path.
Not really related but I wonder how people benchmark the effectiveness of skills/agents?
I'm seeing the agent working quite fine with just direct prompting and the agent doing things by itself rather than using skills. Is it better for certain task size?
Any skills, I just add into the tool itself. I then have the py tools in their PWD, don’t bother with mcp.
Don't find them. Ask the AI to do something. When it does it correctly, ask it to make a skill for it. Clear the session, try to use the skill, fix any problems found, modify your repo and harness if necessary. Repeat until skill works 0-shot. Improve with the same process.
This largely works with a specific model, specific harness, specific prompt, specific context. You may need to modify your agent harness to manage skills depending on runtime parameters. Pi is a great general purpose agent for the these modifications.
If you do find other skills and want to use them, put them through the loop above. But keep in mind that since they were created in their own circumstances, they may not work in yours.
Also separate rules from skills. Rules tell AI when to do things, skills tell AI how to do things. Tool call/MCP limitations, agent configurations, and harness extensions, can help it stay on track.
With a custom skills workspace in mininote
https://mininote.ink/docs/mcp-docs
Agent can use mcp to update its own skills, or I can copy template skills into local dorectories via the api. Very useful, like notion on steroids but is completely free.
how did stupid markdown file become a thing, this industry really went to shit.
i have a docs/
it has all the skills/docs my particular application needs
i treat it as ADRs as it helps the AI understand the parts of the system it is working on
I wrote a small command-line tool that installs skill packs into agent-specific project folders. It works pretty much like `brew` (or any package manager, really). The skills are compiled into the binary so that I don't have to worry about where they're located and can quickly move the skills between machines by copying the tool.
Making sure they actually work? Trial and error, mostly. I know some folks have tried auto-researcher approaches, but I haven't found that to be the best use of time in my work.
Skills are no longer useful.
I find them very useful.
I have been finding them decreasing in the effectiveness with each model release. We got rid of skills and built a determinist harness around the agent instead.
One of the engineers I know is building this product called SkillEd for just this. Lemme know if you need an invite