Build Your Skill Library Cheaply
There's a pattern I keep seeing across teams building with Claude.
Someone hits a tricky problem — getting Claude to handle a messy edge case in the codebase, structuring a long agentic workflow reliably, pulling context from the right places. They grind through it, iterate until something works, ship it, and move on.
Across the org, someone else is doing the exact same thing. Not two weeks later. The same day.
And the cost is identical whether it's the same afternoon or six months apart — you're paying full price for a problem that's already been solved. The solution just wasn't captured anywhere.
This is where extensions come in.
Extensions are the capture mechanism: skills (prompt templates that shape Claude's behavior for a specific task), hooks (checkpoints that intercept Claude's workflow to save tokens, enforce consistency, or add reliability), MCPs (connectors that give Claude access to external tools and data), and CLAUDE.md rules (persistent instructions that tell Claude how to work in your repo). Different shapes of the same idea — encode a solution once, use it everywhere.
The hidden value: when a new hire joins with a well-built extension library, they hit the ground at the same capability as the senior who built it. You're not just saving time — you're distributing expertise. The senior's hard-won solutions become the new hire's day-one toolkit.
The process is simpler than most teams expect.
Notice the repetition. Someone solves the same problem more than once. That's the signal.
Work through it properly with Claude. Iterate until you have something that reliably works.
Synthesize it. Compress what worked into a reusable form — a skill file, a hook, a rule. This step is usually 30 minutes, not 3 days.
Contribute it. More on structure in Issue 2, but even a shared folder beats nothing.
Hooks are especially underused here. Teams default to skills and MCPs because those feel more tangible — hooks feel abstract. But a well-placed hook that catches a failure mode before it burns tokens, or saves intermediate state in a long workflow so Claude doesn't rebuild context from scratch, is often worth more than a dozen skills.
Rules are also underrated. When your team is opening PRs at pace, don't wait for problems to surface — encode how Claude should work in your repo from the start. A CLAUDE.md at the repo root that captures your conventions means any agent (or teammate) picking up the work already has context. Different from skills, and just as valuable.
The contribution problem isn't absence of sharing — it's friction.
Most teams have a few people who add to the extension library and a lot of people who don't. The fix isn't cultural, it's structural: make it easy enough that contributing is the path of least resistance.
That means a clear place to put new extensions, a lightweight PR process, and ideally an automated CI pipeline that validates before anything lands. You don't want to kill a plugin just because it's imperfect — but a review step means the library stays trustworthy enough that people actually use it. That's what makes an open contribution model work.
The mindset shift worth landing on:
Get obsessed with capturing. Every time a task required real thinking, that thinking should live somewhere reusable. Either it becomes a new skill, or it sharpens one that already exists.
You're not building a library as a project. You're developing a habit: think → solve → capture. The library is just what accumulates.
A template for synthesizing any solution into a skill:
At the end of any session where you've cracked something non-trivial, try this:
I just solved [describe the problem] by [describe what worked].
Help me synthesize this into a reusable skill file that:
- Captures the core instruction/behavior that made this work
- Is written generically enough to apply across similar situations in our codebase
- Includes a brief description so teammates understand when to use it
- Notes any edge cases or constraints to be aware of
Format it as a SKILL.md file I can drop into our repo.
Ten minutes. One solved problem that never has to be solved again.
One more thing — Anthropic ships a plugin for exactly this.
The official Claude Code marketplace includes plugin-dev, a toolkit built specifically for creating your own plugins. It's pre-loaded, no marketplace setup needed. Just run:
/plugin install plugin-dev@claude-plugins-official
That's your starting point. Build the habit, then package what you build.
Next issue: where these extensions should actually live — and why centralizing everything into a company-wide marketplace is quietly killing your context window.
The Context Loop publishes every Thursday for engineers and AI leads building with Claude. Forward this to one person on your team who's been solving the same problem twice.