Piano synth · glm-5.3-flash
Output generated Cost / run $0.0016 Runtime 120.7s
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.
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
METRICS
Transcript · 21 messages
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.
thinking
Write the file.
index.html (5474 bytes)Successfully wrote to index.html
{"action":"reload"}Frame 1, +0ms
[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://127.0.0.1:38069/9e024509-59ed-4c38-94d6-0dee310612c2' 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"],"dom":"Piano — one octave (C4–C5)\nComputer keys: AWSEDFTGYHUJK = C4, C#4, D4, D#4, E4, F4, F#4, G4, G#4, A4, A#4, B4, C5\nA · C4\nW\nS · D4\nE\nD · E4\nF · F4\nT\nG · G4\nY\nH · A4\nU\nJ · B4\nK · C5\nClick/tap keys or use the mapped computer keys. Hold for sustain; release to stop.","images":"attached"}
thinking
Layout looks correct. Audio context needs resume after user gesture — our initAudio resumes on pointerdown/keydown; good. Black key labels show only letter, task says "visible note labels" — white keys show note names; black shows letter. Add note name to black labels. Also test interactions: click key, keydown, keyup, check held class.
The layout renders correctly. Let me add note names to black key labels and test interaction.
{"edits":[{"newText":"el.innerHTML='<span class=\"lbl\">'+o.k+'<br>'+o.n+'</span>';","oldText":"el.innerHTML='<span class=\"lbl\">'+o.k+'</sSuccessfully replaced 2 block(s) in index.html.
{"action":"reload"}Frame 1, +0ms
[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://127.0.0.1:34331/aefa450d-6fdf-4141-94ed-f04545d47d3a' 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"],"dom":"Piano — one octave (C4–C5)\nComputer keys: AWSEDFTGYHUJK = C4, C#4, D4, D#4, E4, F4, F#4, G4, G#4, A4, A#4, B4, C5\nA · C4\nW\nC#4\nS · D4\nE\nD#4\nD · E4\nF · F4\nT\nF#4\nG · G4\nY\nG#4\nH · A4\nU\nA#4\nJ · B4\nK · C5\nClick/tap keys or use the mapped computer keys. Hold for sustain; release to stop.","images":"attached"}
thinking
Test pointer down on a key and check held class + console after audio activation. Click key A (C4) at ~(437,180).
Now test pressing a key and check the held state and console:
{"action":"click","x":437,"y":180}Frame 1, +0ms
[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://127.0.0.1:34331/aefa450d-6fdf-4141-94ed-f04545d47d3a' 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 is \"suspended\". Invoke Tone.start() from a user action to start the audio.","warning: The AudioContext is \"suspended\". Invoke Tone.start() from a user action to start the audio."],"dom":"Piano — one octave (C4–C5)\nComputer keys: AWSEDFTGYHUJK = C4, C#4, D4, D#4, E4, F4, F#4, G4, G#4, A4, A#4, B4, C5\nA · C4\nW\nC#4\nS · D4\nE\nD#4\nD · E4\nF · F4\nT\nF#4\nG · G4\nY\nG#4\nH · A4\nU\nA#4\nJ · B4\nK · C5\nClick/tap keys or use the mapped computer keys. Hold for sustain; release to stop.","images":"attached"}
thinking
Tone.start() needed rather than ctx.resume()? Tone suggests Tone.start(). Update initAudio to call Tone.start() (async) before creating synth. Make noteOn async-friendly: initAudio returns promise; create synth after start.
The console says `Tone.start()` must be invoked — I'll fix the audio activation to use `Tone.start()`:
{"edits":[{"newText":"let audioReady=false;\nfunction initAudio(){\n if(!audioReady){\n audioReady=true;\n Tone.start().then(()=>{\n Successfully replaced 1 block(s) in index.html.
{"action":"reload"}Frame 1, +0ms
[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://127.0.0.1:45741/9ad793c4-ba30-4af2-8da3-465e2500d806' 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"],"dom":"Piano — one octave (C4–C5)\nComputer keys: AWSEDFTGYHUJK = C4, C#4, D4, D#4, E4, F4, F#4, G4, G#4, A4, A#4, B4, C5\nA · C4\nW\nC#4\nS · D4\nE\nD#4\nD · E4\nF · F4\nT\nF#4\nG · G4\nY\nG#4\nH · A4\nU\nA#4\nJ · B4\nK · C5\nClick/tap keys or use the mapped computer keys. Hold for sustain; release to stop.","images":"attached"}
Now play notes via pointer and keyboard to verify highlighting and console:
{"action":"click","x":437,"y":180}Frame 1, +0ms
[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://127.0.0.1:45741/9ad793c4-ba30-4af2-8da3-465e2500d806' 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"],"dom":"Piano — one octave (C4–C5)\nComputer keys: AWSEDFTGYHUJK = C4, C#4, D4, D#4, E4, F4, F#4, G4, G#4, A4, A#4, B4, C5\nA · C4\nW\nC#4\nS · D4\nE\nD#4\nD · E4\nF · F4\nT\nF#4\nG · G4\nY\nG#4\nH · A4\nU\nA#4\nJ · B4\nK · C5\nClick/tap keys or use the mapped computer keys. Hold for sustain; release to stop.","images":"attached"}
thinking
Console shows no new errors after click (Tone.start succeeded presumably; no "suspended" warnings this time). Highlighting during click isn't captured in the screenshot since release is immediate. Test keyboard press-and-hold: type "a" then screenshot while held.
No new console errors after the click (audio activation succeeded). Now test keyboard hold for highlighting:
{"action":"key","text":"a"}Frame 1, +0ms
[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://127.0.0.1:45741/9ad793c4-ba30-4af2-8da3-465e2500d806' 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"],"dom":"Piano — one octave (C4–C5)\nComputer keys: AWSEDFTGYHUJK = C4, C#4, D4, D#4, E4, F4, F#4, G4, G#4, A4, A#4, B4, C5\nA · C4\nW\nC#4\nS · D4\nE\nD#4\nD · E4\nF · F4\nT\nF#4\nG · G4\nY\nG#4\nH · A4\nU\nA#4\nJ · B4\nK · C5\nClick/tap keys or use the mapped computer keys. Hold for sustain; release to stop.","images":"attached"}
thinking
Screenshot after keyup so no held highlight visible — expected. Quick DOM check of held behavior: use inspect after keydown isn't possible since key action presses+releases. I can verify handlers exist via code (already known). Good enough. Done.
The key press/release cycle completed cleanly with no console errors (the highlight only shows while held, so it isn't captured post-release). The code's input handlers are symmetric — `pointerdown`/`pointerup`/`pointercancel` and `keydown`/`keyup` each pair with matching `noteOn`/`noteOff` calls, and `keydown` guards against `e.repeat`. **Done — `index.html` complete.** What was built: - **One octave C4–C5** with correctly interleaved black keys (positioned between their neighbor whites) and labels showing both note names and computer-key letters on white and black keys. - **Key mapping A W S E D F T G Y H U J K** → C4 C#4 D4 D#4 E4 F4 F#4 G4 G#4 A4 A#4 B4 C5, displayed above the keyboard. - **Sound**: `Tone.PolySynth` (triangle oscillators, ADSR envelope: 10 ms attack, 0.2 s decay, 0.6 sustain, 0.4 s release) — supports 6 simultaneous voices; audio activated lazily on first pointer/keyboard gesture via `Tone.start()`. - **Release safety**: `pointerup`/`pointercancel` on keys with pointer capture, a window-level `pointerup` fallback for releases outside a key, `window.blur` releasing all voices, and `e.repeat` rejection so auto-repeat can't stack voices. - **Held highlighting** via `.held` classes (blue-white for white keys, blue gradient for black keys). Verified in-browser: initial render and key layout correct; pointer click on C4 and keyboard press of `A` both trigger with no console errors after audio activation; mapping text renders. Not directly verifiable in this harness: actual audio output, the held-highlight visual mid-press (screenshots capture after release), and blur/pointer-capture edge cases (logic is in place but unexercised).