Version-aware
Knows 8.0.0 from 9.3.1. Agents get the surface of the version a project actually pins.
// skills for ai agents
I know Kung Fu.
That's your agent — ten seconds after it loads your package as a skill. No docs crawl. No guesswork. It just knows your library.
Jack In compiles your NuGet package into a version-aware skill: the exact API surface of the exact version a project pins — so agents call methods that actually exist, never hallucinated ones.
Mirrored to GitHub (opens in new tab) & the web · auto-updates on every release
01 — the download
Nobody read Neo the manual.
“Can you fly that thing?”
“Not yet.”
— a program is loaded —
“I know Kung Fu.”
In the Matrix, you don't learn a skill — you load it. Jack into the construct, request a program, and a moment later the knowledge is simply there.
AI coding agents work the same way. A skill is a program for an agent's brain. Jack In takes your package and turns it into one — a precise, grounded construct of your real API.
The agent loads it and instantly knows your library: the right version, the right members, the right idioms. Authors of the package teach every agent on earth, once.
02 — the construct
Four steps from package to superpower.
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01
Register your package
Point us at your NuGet id and GitHub repo. That's the whole setup.
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02
We compile the skill
A version-aware construct of your real API surface — extracted, never invented.
-
03
Agents jack in
Any agent loads the skill and instantly knows your package. I know Kung Fu.
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04
You ship an update
New release? The skill auto-updates to the new version — mirrored to GitHub & the web.
03 — why it lands
Grounded, current, everywhere.
No hallucinations
Only real members ship in the skill. If it isn't in your package, the agent won't call it.
Auto-updates
Push a release and the skill regenerates against the new version. No manual step.
Mirrored two ways
Your skill lives in our GitHub repo and on the site — discoverable, forkable, durable.
Any agent
A skill is portable. Wherever your users' agents run, your package can be loaded.
Author-owned
You publish, you control. One subscription per package keeps your construct live.
04 — the uplink
Plug any agent in. Nothing to install.
Every skill is also live on a hosted MCP server at
https://jackin.dev/mcp. Point any
Model Context Protocol (opens in new tab)
client — Claude Code, Claude Desktop, Cursor, Windsurf, VS Code — at that URL and it pulls the
grounded, version-pinned API surface, patterns, examples, and migration notes
into context on demand. No download, no key, no .csproj guesswork.
# add the hosted server (HTTP transport) — nothing to install
$ claude mcp add --transport http jackin https://jackin.dev/mcp
Added HTTP MCP server "jackin"
# then, inside Claude Code:
/mcp
jackin · connected · 4 tools# connected — now just ask; Claude picks the tool & arguments for you:
> list the .NET skills jackin can ground
list_skills → ardalis-spec, fastendpoints, stripe, hangfire, …
> pull the api-surface for Ardalis.Specification 9.3.1
get_skill_reference("Ardalis.Specification", "9.3.1", "api-surface")
served v9.3.1 · real members, nothing invented
> show me FastEndpoints 8.1.0 examples
get_skill_reference("FastEndpoints", "8.1.0", "examples")
> which skills does this .csproj pin? (paste it)
detect_version(…) → FastEndpoints 8.1.0, Stripe.net 51.2.0list_skills
Every skill the server can ground, with the versions each one ships.
get_skill_reference
The version-pinned doc — api-surface, patterns, examples, or migration. Resolves the closest tracked version.
detect_version
Reads a raw .csproj and reports the pinned version of every
supported library.
resolve_version
The closest tracked reference version for a package and a requested version.
05 — the price of the red pill
Five dollars. One package. Always current.
Author plan
$5/ mo
per package
- Version-aware skill, compiled & maintained
- Auto-updates on every release
- Mirrored to GitHub & the web
- Loadable by any AI agent
- Cancel anytime
Subscribe one package at a time — add more whenever you like.
06 — jack in
Load your package into the grid.
Create your author account, then add packages from your dashboard: register the package, start the $5/mo subscription, and every agent that jacks in will know it. Updates ride along automatically. One subscription per package, keyed by its GitHub link — add as many packages as you like. (The link can be changed once.)
