A developer-first library to have Jev integrated into your users' inbox, calendar, Slack channels and more!
Replies
Does this email need a reply today?
Invites
How important is this meeting to this person?
Bug reports
Is this a bug report?
Phishing
Is this a phishing attempt?
Moderation
Is this message hateful?
Data leaks
Does this file expose customer data?
Ready-made integrations for the apps your users already use.
How it works
Say you're building Acme, an assistant that looks after people's calendars. You want it to accept the meetings that matter and tell the person why. Here's the whole monitor, and what happens when one invite arrives.
01 · Connect
Dana, one of Acme's users, signs in with Google through your own OAuth app, and the tokens stay in your database. From then on, the integration picks up every new or changed invite and remembers where it left off, so nothing is missed or handled twice.
source: google.calendar.invites(),02 · Context
An invite on its own doesn't say much. The integration works out who organized it, how soon it starts and whether it clashes with anything else. Your profile function adds what Acme knows about Dana, such as their job.
profile: (connection) => profileOf(connection.userId),Q4 planning
Thu, Oct 2 · 10:00 to 11:00
03 · Ask
Write the question the way you'd ask a colleague, and name the answers you care about. Each answer becomes an event you can listen for, like importance:critical, and TypeScript checks the names.
importance: choice("How important is this meeting to this person?", { critical: "They should be there", useful: "Worth going if they're free", skip: null,}),04 · Judge
Jev is TypeSafe's model for questions like this one. It gives each answer a probability between 0 and 1, and for this invite it says 0.91 for critical. A call costs a fraction of a cent, so you can afford to ask about every invite.
critical: "They should be there",useful: "Worth going if they're free",skip: null,212 msexample numbers
05 · Decide
You choose the cut-offs. At 0.85 or higher, Acme acts on its own. Between 0.6 and 0.85, it asks Dana first. Below 0.6, nothing happens.
invites.on("importance:critical", { min: 0.85, review: 0.6 }, google.calendar.respond("accepted"));invites.on("importance:critical", { min: 0.85 }, (e) => notify(e.connection, e.item));invites.on("review", (e) => askUser(e.connection, e));critical 0.91 → act
06 · Act
0.91 clears 0.85, so the native action accepts the invite and your own notify function tells Dana why. New monitors run in dry-run mode, where native actions only report what they would do, until you turn it off.
invites.on("importance:critical", { min: 0.85, review: 0.6 }, google.calendar.respond("accepted"));invites.on("importance:critical", { min: 0.85 }, (e) => notify(e.connection, e.item));Sarah Chen (CEO) invited you to Q4 planning.
Looks critical, so it's on your calendar.
Why Jev
Sending every email to a large chat model is slow and expensive, and you get back text you still have to parse. Jev is made for short questions like the one above. It answers in milliseconds and gives you a probability you can set a threshold on.
~200 ms
to answer a question
TypeSafe lists 150 to 300 ms
$0.042
per million input tokens
Output tokens are free
0 to 1
a probability for each answer
You decide where the cut-offs go
Speed and price are TypeSafe's published figures. The scores in the walkthrough above are made up for the example.
Integrations
Each integration already deals with the platform's API, so you don't have to learn how to fetch new items, refresh tokens or stay under rate limits. It also comes with the actions you'd want, like accepting an invite or moving an email to Junk. Sign-in goes through your own OAuth app, and the tokens stay in your database.
Watches new mail, threads and labels
Actions:
Watches new mail and folders
Actions:
Watches invites, changes and upcoming events
Actions:
Watches messages, threads and reactions
Actions:
Watches chats and channels
Actions:
Watches server messages
Actions:
Watches issues and comments
Actions:
Watches issues, pull requests and reviews
Actions:
Watches pages and databases
Actions:
Watches files and sharing changes
Actions:
Watches live chat
Actions:
Watches live chat and comments
Actions:
Using something else? Send items in with webhook() or from(asyncIterable).
It's an open-source TypeScript library under the MIT license. Monitors start in dry-run, so you can point one at a real account without it changing anything.