Playground/Games & simulations
API ACTIVITY

Usage & budget

PLAYGROUND SAFETY LIMITS

Steady requests. Visible limits.

0 active · 0/20 queued

Browser: one start every 1.2 seconds (at most 50/minute), up to 2 active calls and 20 waiting. Shared by examples in this tab. Waiting requests cancel when their run is stopped; a full queue rejects new work without an API call.

Server: 60 requests per rolling 60 seconds and 2 concurrent calls per key, per server instance. Other tabs using the same key share that instance’s allowance. This in-memory safeguard resets on restart and is not a distributed or account-wide quota.

Source: playground policy in lib/requestRateLimit.ts. TypeSafe may impose separate limits. Provider HTTP 429 pauses calls until its reported reset; without a reset time, retry requires your action. HTTP 402 is a budget/billing failure, not a pacing limit. No automatic retries or background replay.

Your TypeSafe API key

Import your key to override the shared server default.

Saved on this browser until removed or site data is cleared. Masked on screen; sent only with Jev requests through this app. The saved value is never displayed.

Connecting

TYPESAFE AI / GAMES & SIMULATIONS

Small decisions.
Visible limits.

Watch small decisions play out—and discover their limits.

World stateOne actionPlay it out

Jev chooses inside a fixed set.
Code decides what that choice may do.

Workspaces4

Open one to try it. Every workspace keeps mock, live and failed results clearly labeled.

Jev plays Doom

Enter JevDoom’s fullscreen 3D arena and compare human, Jev and random play.

in
Arena state
out
one action

MicroDuck arena

Guide a robot through a 3D delivery floor with seven possible actions.

in
Robot sensors
out
movement

Jev attempts chess

See why choosing a legal move without lookahead falls short of a chess engine.

in
Legal moves
out
one choice

IQ-style test

Give Jev 12 original reasoning puzzles and check each choice against an explained answer key.

in
Reasoning puzzles
out
checked answers