Piano synth · qwen3.6-35b-a3b

Output generated Cost / run $0.0034 Runtime 47.2s

Prompt for this run

Build a playable piano keyboard using the provided Tone.js library. Use HTML, CSS, and JavaScript as needed. Write it to `index.html` in the current working directory using your file tools. Inline your own CSS and JavaScript. Do not use external assets, CDNs, or network requests. Use the provided `tone.min.js` (global `Tone`) through a plain local script tag; the runner will inline it into the final artifact. Required behavior: - Display one chromatic octave from C4 through C5, with correctly placed black and white keys and visible note labels. - Map computer keys A W S E D F T G Y H U J K in order to those 13 notes. Pressing a screen key or its computer key starts the note; releasing it starts the envelope's release phase. - Use a synthesized voice with an ADSR envelope and support at least three simultaneous notes. Highlight keys while held. Prevent keyboard auto-repeat from creating duplicate sustained voices. - Release held voices when the pointer is released outside a key or the window loses focus, so notes cannot remain stuck. - Activate audio through a user gesture and synthesize all sound without audio files. Display the computer-key mapping. Verify: Play a few notes using the available mouse and keyboard actions. Check note/key labeling, any observable press-and-release highlighting, and the console after audio activation. Briefly inspect the input handlers for matching note-start and note-release behavior.

⛨ sandboxed Open in new tab ↗

TAKE IT TO CODE

A single self-contained HTML file — copy it and open in any browser, or reuse the prompt with your own pi-agent run.

RUN

modelqwen3.6-35b-a3b

vendorQwen

harnesspi 0.87.1 · browser iteration

generated2026-10-14

METRICS

runtime47.2s

tokens in14k

tokens out3.8k

cached0

cost / run$0.0034

Transcript · 9 messages

system

user

assistant

thinking

The user wants me to build a playable piano keyboard using Tone.js. Let me first check what's in the current directory, then build the application.

Key requirements:
1. One chromatic octave C4-C5 with black/white keys and visible labels
2. Keyboard mapping: A W S E D F T G Y H U J K → 13 notes
3. ADSR envelope, polyphony (≥3 notes), highlight while held
4. Prevent keyboard auto-repeat from creating duplicate voices
5. Release on pointer release outside key or window loses focus
6. Audio activation via user gesture
7. Display computer-key mapping
8. Use local tone.min.js

Let me first check the directory contents.

→ bash {"command":"ls -la /tmp/job-JJj7x 2>/dev/null; ls -la /tmp/job-JJj7mx/"}

toolResult

total 356 drwx------ 3 node node 4096 Oct 14 02:34 . drwxrwxrwt 6 root root 4096 Oct 14 02:34 .. drwxr-xr-x 3 node node 4096 Oct 14 02:34 .home -rw-r--r-- 1 node node 349169 Oct 14 02:34 tone.min.js

assistant

thinking

Good, `tone.min.js` is present. Now let me build the complete piano application. Let me plan the notes and keyboard mapping:

C4 D4 E4 F4 G4 A4 B4 C5 (white keys)
Black keys between: C#4 D#4 F#4 G#4 A#4

Notes C4-C5:
- C4: A
- C#4: W
- D4: S
- D#4: E
- E4: D
- F4: F
- F#4: T
- G4: G
- G#4: Y
- A4: H
- A#4: U
- B4: J
- C5: K

Let me build this now.

→ write /tmp/job-JJj7mx/index.html (9457 bytes)

toolResult

Successfully wrote to /tmp/job-JJj7mx/index.html

assistant

thinking

Good, the file is written. Now let me open it in the browser and verify it works properly.

Now let me verify the application in the browser:

→ browser {"action":"screenshot"}

toolResult

Frame 1, +1ms

[Browser image supplied to model]

{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing.","log: %c * Tone.js v14.8.49 * background: #000; color: #fff","error: Creating a worker from 'blob:http://127.0.0.1:40959/6f6318b1-b5e0-47e2-8e31-c46fc2277a36' violates the following Content Security Policy directive: \"worker-src 'none'\". The action has been blocked.","warning: The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://developer.chrome.com/blog/autoplay/#web_audio","warning: The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://developer.chrome.com/blog/autoplay/#web_audio","warning: The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://developer.chrome.com/blog/autoplay/#web_audio","warning: The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://developer.chrome.com/blog/autoplay/#web_audio","warning: The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://developer.chrome.com/blog/autoplay/#web_audio","warning: The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://developer.chrome.com/blog/autoplay/#web_audio","warning: The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://developer.chrome.com/blog/autoplay/#web_audio"],"dom":"🎹 Click to Start Playing\n🎹 Piano\nClick above to enable audio\nC4\nA\nC#4\nW\nD4\nS\nD#4\nE\nE4\nD\nF4\nF\nF#4\nT\nG4\nG\nG#4\nY\nA4\nH\nA#4\nU\nB4\nJ\nC5\nK\nC4 = A C#4 = W D4 = S D#4 = E E4 = D F4 = F F#4 = T G4 = G G#4 = Y A4 = H A#4 = U B4 = J C5 = K","images":"attached"}

assistant

thinking

The initial render looks good structurally. The "Click to Start Playing" overlay is visible, keys are labeled, and the keyboard mapping is shown. Now let me test actual audio playback by simulating user interaction.

Good initial state. Now let me activate audio and test keyboard/mouse input: