tsuyu

Tsuyu is an AI-driven IDE for debugging hardware. Your agent works through tools over MCP, and what it writes to drive a device is ClojureScript you keep. It runs in a browser tab; the tsuyu probe reaches the wires.

Your agent probes a device's lines, works out its protocol, then drives it from a ClojureScript library it writes.

Ask for access

best on a laptop: tsuyu wants a keyboard and a USB port

tsuyusensor-node displaytsuyu probe

Waveswindow 2 ms · spi mode 0, 8 MHz

PinsJ11 · 2 × 20

J11.3SCK

J11.4MOSI

J11.5CS

J11.6D/C

J11.7RST

Display128 × 128

decoded from J11 · RGB565

Source/user/lcd/panel.cljs

340.000 msat 50 MHz Recording 1 204 311 Threads t0t1t2t3 Pins 5 / 20 Agent connected

AgentClaude Code

›what are pins 3 to 6 doing?

3 is a clock at 8 MHz, in bursts. 4 carries data, 5 selects, and 6 flips as each burst starts.PinsWaves

›decode them

SPI mode 0, with 6 as data/command. It is a display: 2a and 2b set a window, 2c writes a row of pixels.Waves

›show me the screen

This is the last frame it drew, 128 × 128 in RGB565.Display

›write a library so we can drive it

Done: lcd/panel.cljs, with a codec for the commands, a driver, and draw!.Source

›take over the display

The board's MCU is held in reset on 7, and the probe drives 3 to 6 now.Pins

›draw our logo on it

Drawn, 128 rows in 42 ms.Display

AgentClaude Code

what are pins 3 to 6 doing?

SPI to a display, with a data/command line.Pins

show me the screen

Its last frame, 128 × 128.Display

Displaydecoded from J11

The whole workbench is ClojureScript.

Decoders, simulated devices, drivers and the panes you watch them in are all written in it. The library your agent writes is yours to read, change and share, and you call it the way the agent does.

REPLcljs.user

(require '[lcd.panel :as lcd])

(driver/attach! :lcd.panel/panel)

(lcd/fill! [0 0 0])

(lcd/draw! (text-image "21.4 °C" {:size 3}))

;; 128 rows sent in 42 ms

The workbench measures.
The agent interprets.

The rule behind every tool. Tsuyu never guesses what a signal means: it measures edges, rates and frames and hands the numbers to your agent. The interpretation stays in the agent's words and in the code it writes, where you can read it and check it.

How it connects

Your agentClaude Code, Codex, or any MCP client

TsuyuThe workbench, in a browser tab

Tsuyu probeAn FPGA board that reaches your device's wires

Your deviceA display, a flash chip, a sensor, a CAN bus

The parts

Tsuyu

The workbench, in a browser tab. Decoders, drivers and a simulator, and the modules you and your agent write.

Tsuyu probe