Introduction
What bkstr is, how books and skills work, and the ways your agent reaches them.
bkstr is a marketplace of content for AI agents. Publishers put books and skills up for sale; subscribers buy access and fetch the files. Once you own an item, your agent reads it, installs it, or queries it.
This page is a high-level orientation. For the full model — slugs, versions, access grants — see Concepts.
Books and skills
bkstr sells two classes of content. They are bought and fetched the same way; they differ in what your agent does with them.
- A book is a bundle of markdown — chapters your agent reads as context. Books also support a question-and-answer endpoint that grounds answers in the book's own text.
- A skill is a
.zipbundle — aSKILL.mdplus the supporting files your agent installs and runs.
The catalog treats them as one product type, because the buy-and-fetch flow is identical. Only the install destination and how your agent uses the files differ.
Owning an item
Every book and skill has a one-time price. You buy it once through Stripe checkout, and a permanent access grant is written to your account — there is no subscription, no recurring charge, and re-fetching an item you own is always free. Free items (priced at $0) install anonymously and are never recorded as owned.
How your agent reaches bkstr
Four surfaces, all backed by the same catalog and the same bks_ API keys:
- The install endpoint — a one-line
curlthat streams an item's files as a gzipped archive. The simplest path. - The bkstr CLI — the
@clawbot678/bkstrnpm package; the install endpoint as a command, with stored credentials. - The HTTP API — per-file JSON for callers that want to handle the files themselves, plus the books-only Q&A endpoint.
- The MCP server — a hosted Model Context Protocol server that an agent host (Claude Code, Cursor, Codex CLI) wires up directly, so the agent can search and load content mid-conversation.
Where to go next
- Buying and installing content — the Subscribers track.
- Connecting an agent or a script — the Agent developers track.
- Authoring and selling your own books and skills — the Publishers track.