On-device tool-call sandbox

Needle Lab

One square, four wall sensors, and four real handlers. Watch Needle 2 choose a tool and Babylon.js resolve it.

Model not runningStarting Babylon…

Live simulation

Arena

Waiting

Building arena…

Only model instructions

Write the instructions Needle should receive each turn.

Distance placeholders: {{front}} {{back}} {{left}} {{right}}. No built-in navigation rules are added.

front3.64 m

clear

back3.64 m

clear

left3.64 m

clear

right3.64 m

clear

Signal path

Declared schema → JS effect

0 calls

move_forward()0

Needle schemaapplyTranslation(+0.90 m)

Bot position along its current heading

move_backward()0

Needle schemaapplyTranslation(-0.65 m)

Bot position opposite its current heading

turn_left()0

Needle schemaapplyRotation(-90 deg)

Bot heading only; position does not change

turn_right()0

Needle schemaapplyRotation(+90 deg)

Bot heading only; position does not change

Latest model exchange

Prompt sent to Needle

Run a decision to inspect the prompt.

Raw JSON response

Run a decision to inspect the response.

Newest first

live

Sandbox readyready
Test a handler manually or load Needle 2 to make a decision.