api.email.getAttachmentText reads PDF (pdf.js), Word, Excel, PowerPoint
and OpenDocument files (own reader over fflate and DOMParser, unpacking
capped at 50 MB), text, CSV, HTML, calendar and address files, and
answers with a status for what it can't read. The extraction lives in
lib/attachment-text so Files can use it too.
The sandbox runtime now copies every flag the host sends into
api.host.features; before, it kept only the three core flags, so the
assistant's flags never reached a plugin. The host bridge assertions in
plugin-host-features.test.ts compare against the core flags plus the
assistant's (withAssistant), since the init payload and host-change now
carry attachmentText too.
The assistant's new host calls come in four areas (context, actions,
Files, the panel in every view), built side by side. Each area gets its
own files under lib/plugin-sandbox/assistant for its permissions, method
table, dispatcher, host feature flags and sandbox methods; the shared
files only read the merged result. No area adds anything yet. The host
features test now compares against the core flags plus the areas' flags.
Linus Rath