—kit

AI interface states built as instruments: the chrome reports what the agent is doing.

REPLAY [FIXTURE]TRACE [fixture-2026-10-05-weather]

Prompt

EVENTS [81]

mic 50 samples @ 20Hz
t+0380 start fixture-msg-1
t+0380 start-step
t+0420 reasoning-start r1
t+0460 reasoning-delta r1
t+0580 reasoning-delta r1
t+0700 reasoning-delta r1
t+0820 reasoning-delta r1
t+0940 reasoning-delta r1
t+1060 reasoning-delta r1
t+1180 reasoning-delta r1
t+1300 reasoning-delta r1
t+1420 reasoning-end r1
t+1500 tool-input-start search
t+1540 tool-input-delta call_search_1
t+1580 tool-input-delta call_search_1
t+1620 tool-input-delta call_search_1
t+1660 tool-input-available search
t+2380 tool-output-available call_search_1
t+2420 finish-step
t+2440 start-step
t+2480 reasoning-start r2
t+2520 reasoning-delta r2
t+2670 reasoning-delta r2
t+2820 reasoning-delta r2
t+2970 reasoning-delta r2
t+3160 reasoning-end r2
t+3220 text-start t1
t+3260 text-delta t1
t+3348 text-delta t1
t+3436 text-delta t1
t+3524 text-delta t1
t+3612 text-delta t1
t+3700 text-delta t1
t+3788 text-delta t1
t+3876 text-delta t1
t+3964 text-delta t1
t+4052 text-delta t1
t+4140 text-delta t1
t+4228 text-delta t1
t+4316 text-delta t1
t+4404 text-delta t1
t+4492 text-delta t1
t+4580 text-delta t1
t+4668 text-delta t1
t+4756 text-delta t1
t+4844 text-delta t1
t+4932 text-delta t1
t+5020 text-delta t1
t+5108 text-delta t1
t+5196 text-delta t1
t+5284 text-delta t1
t+5372 text-delta t1
t+5460 text-delta t1
t+5548 text-delta t1
t+5636 text-delta t1
t+5724 text-delta t1
t+5812 text-delta t1
t+5900 text-delta t1
t+5988 text-delta t1
t+6076 text-delta t1
t+6164 text-delta t1
t+6252 text-delta t1
t+6340 text-delta t1
t+6428 text-delta t1
t+6516 text-delta t1
t+6604 text-delta t1
t+6692 text-delta t1
t+6780 text-delta t1
t+6868 text-delta t1
t+6956 text-delta t1
t+7044 text-delta t1
t+7132 text-delta t1
t+7220 text-delta t1
t+7308 text-delta t1
t+7396 text-delta t1
t+7484 text-delta t1
t+7572 text-delta t1
t+7660 text-end t1
t+7680 finish-step
t+7700 finish

Hand-authored fixture for the docs replay. Not a recorded model trace. Replace with a real recorded turn before public launch.

# Components

Listening
Turns any child into a level meter. The ticks, the peak and the dB are the microphone, measured.
Thinking
The agent's working state as a log. Steps come from the agent's events, durations from the clock.
Tool call
A bracketed card while a tool is running, a single log row once it is done.
AI SDK adapter
useKitTurn maps useChat messages onto Thinking and Tool call. It imports nothing from the SDK.
HUD utilities
cx, the shared frame loop, reduced-motion helpers, formatters.