AI Guides › Skills & Agents
The Skill Version Nobody Updates — And What Breaks When They Don't
By Nigel Guy · 2 min read
A skill gets shared. Someone copies it into their own setup, tweaks a line, and carries on. Months later you fix a real problem in your version — a step that produced the wrong output on certain inputs — and the fix reaches exactly one copy: yours. Every other copy is still running the old, broken version, and nobody using it has any reason to suspect that, because nothing about a skill file tells you it has been superseded.
The rule: a skill without a version number and a one-line changelog is a skill whose copies will silently drift apart — the fix you ship only exists where someone knows to go and get it.
The mechanism
- Put a version and a date at the top of every skill you share. Not a formal release process — a single line:
v3 · 2026-09 · fixed date handling for non-UK formats. That line is what lets anyone holding a copy notice theirs is older.
- Keep a changelog of the fixes that matter, not every edit. Three short lines covering behaviour changes ("now asks before overwriting", "stopped assuming a fixed currency") are enough. Nobody reads a changelog of typo fixes, and they shouldn't have to.
- Keep one canonical copy, and say where it lives. A shared folder, a repository, a single link — somewhere people can check against. Without one, "latest version" means whichever copy happens to be in front of you.
- Tell people when a fix is behaviour-changing. A silent improvement nobody hears about only reaches the people who happen to re-download. A two-sentence note to the people you know are using it — "v4 fixes the double-counting bug; worth updating" — does more than any versioning scheme.
- When you copy someone else's skill, record where it came from and which version. The moment you tweak it, you own a fork. Knowing its origin is what lets you pull their later fixes in instead of rediscovering the same bugs yourself.
What to skip
Skip heavyweight version schemes for a skill only you use — a date at the top is plenty until you're sharing it. And skip announcing every minor wording change; reserve update notes for fixes that change what the skill actually does, or people learn to ignore them.
Guardrails
- A version number only helps if someone checks it. For anything with real consequences, pair it with an actual message to the people using it rather than assuming they'll look.
- Old copies with write access or autonomy are the dangerous ones — a stale read-only skill produces a wrong draft; a stale acting skill takes a wrong action. Chase those updates first.
- If you can't say which version of a skill a teammate is running, treat its output as unverified until you can — that uncertainty is the actual cost of skipping this.
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