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Every page knows what every other page teaches. The outline now carries a
scope under each page - one line naming what that page and no other page
teaches - and every page is written from a course map that shows every page with
its scope. A page that needs a concept another page owns builds on it or names
that page, instead of explaining it again. The AI plans the scopes together when
it designs the outline; Plan missing scopes fills them in for an outline that
has none in one request. A page also sees the section headings of the pages
already written in its chapter, which is where plans drift.
A third of the prompt, and most of it cached. The page prompt used to carry
the whole outline - six hundred words per chapter - with every page. It now
carries the compact map and its own chapter, measured at 47,000 characters
instead of 139,000 per page on a course of 20 chapters × 7 pages. The shared part
comes first, is byte-identical from page to page, and is marked for each
provider's prompt cache: breakpoints for Anthropic, explicit cache points and a
cache key for OpenAI's gpt-5.6 and later, cache markers through OpenRouter, the
right order for Gemini and every gateway. On a live run with Anthropic the billed
input falls by a little over nine tenths. The cache breakpoint 5.2 set was on a
part of the prompt that differed for every page as soon as pages had tags, so it
paid the cache-write premium on every page and was never read back.
Connected clients read the map once. get_page_brief hands out the shared
context with ids, and a client that passes them back as known_context is not
sent the same text again. plan_page_scopes and update_page's new scope give
a client what the browser has.
The providers as they are today. OpenAI's GPT-6 family (gpt-6-sol,
gpt-6-luna, gpt-6-astra, gpt-6.1-sol, gpt-6.1-terra) was hidden from the
model picker and, typed in by hand, sent parameters it refuses; it is offered and
handled as the reasoning family it is. Gemini's batch queue knows gemini-4-argon
and gemini-3.8-flash; Anthropic's offline fallback names the current models.
Claude is now asked on API version 2026-10-21, which refuses temperature,
top_p and top_k on every model, so none is sent: the profile's temperature no
longer applies to Claude. Current Claude models already refused a custom value,
so pages they write read the same; Claude 4.6 and Haiku 4.5 now sample at their
default.
Libraries current. Vue 3.5.44, marked 18.1.2, DOMPurify 3.4.17, CodeMirror
(with the new @codemirror/streamparser it now needs), Shiki 4.5.0 and
Mermaid 12.2.0. Mermaid is vendored as its ES build: a flowchart in the preview
now fetches 863 KB instead of the 3.5 MB single file of 11 - or the 5.5 MB one
of 12. Diagrams keep the 11.x look and layout, in the preview and through
BookStackDev, because 12 changed four defaults that doubled a small flowchart.
Fixed. Saving or resetting the update token, repository or channel in
Settings ended in a fatal error after the change was written. A diagram, a
formula or highlighted code that arrived while you were on another tab was
thrown away, and the block stayed raw when you came back. A page stored over MCP
was left with a status nothing else uses. A clean clone on Windows failed two
tests before anything had been changed, because Git rewrote line endings; files
are now checked out exactly as committed.
Upgrading from 5.2 is a normal update: the database gains one column on first
start. Existing courses have no scopes until the outline is revised or Plan
missing scopes is pressed; they are written as before, with the compact map,
in the meantime.