Everything the agent needs, and nothing it doesn't
Every Pen is the same, so there is nothing to configure: open one and start reading. It sleeps when nobody is using it and wakes where it left off.
Your files, read properly
Upload PDF, Word, Excel, PowerPoint, CSV or plain text. The agent searches, reads, counts and compares across all of them, and cites file and line. Risky formats are opened in a separate, disposable reader, never inside the Pen.
A database to question
Tables loaded by the instructor are searchable by full text and by SQL, read-only. Ask in plain English; the agent shows the queries behind its figures.
Every passage, not the first few
For questions about every file or every mark, the agent works through all of them and reports its coverage, instead of answering from the first matches it finds.
No way out on its own
Each Pen runs in its own small virtual machine with no direct internet access and no keys inside. Every model call, search and query goes through code outside the Pen, which carries it out and records it.
The web, with guardrails
Web search, and opening only the pages a search returned or the reader typed. Everything else is refused, and the refusal is recorded.
A record you can cite
Each answer ends with a check written by LatentPen, not by the model: what was called, what failed, what was saved.
The second text in every book
Writers read with a pen in hand. Their underlinings, marks and notes, once transcribed into a database, become something you can question at scale: which passages a reader marked, how their marks change across a book or a life, and where they echo in what the reader wrote.
“Which passages did the reader mark most often, and do any of them echo in the reader's own work?”
The agent answers questions like this from the whole database, shows its queries, and quotes the passages, so the evidence stays checkable.
On Cloudflare's developer platform
Each Pen is a Container behind its own Durable Object; uploads and encrypted snapshots live in R2; the shared tables are SQLite in a Durable Object; the model is Claude, reached through Workers AI and AI Gateway.