Piano synth · claude-haiku-5.5
Output generated Cost / run $0.0097 Runtime 71.3s
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 · 22 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
I should check what's in the directory first.
{"command":"cd /tmp/job-I9I5j6 && ls -la && head -c 300 tone.min.js && echo && wc -c tone.min.js"}total 356 drwx------ 3 node node 4096 Oct 14 02:35 . drwxrwxrwt 6 root root 4096 Oct 14 02:35 .. drwxr-xr-x 3 node node 4096 Oct 14 02:35 .home -rw-r--r-- 1 node node 349169 Oct 14 02:35 tone.min.js /*! For license information please see Tone.js.LICENSE.txt */ !function(t,e){"object"==typeof exports&&"object"==typeof module?module.exports=e():"function"==typeof define&&define.amd?define([],e):"object"==typeof exports?exports.Tone=e():t.Tone=e()}("undefined"!=typeof self?self:this,(()=>(()=>{var 349169 tone.min.js
thinking
I'm planning the piano layout mapping keyboard keys to a full octave of white and black keys, and setting up Tone.js with a polyphonic synth that triggers and releases notes based on tracked key or pointer presses. For input handling, I'm using keydown events with repeat suppressed and e.code for layout-independent mapping, while pointer events track pointerId-to-note associations so touches/clicks start and stop notes properly, including handling glissando by detecting when a pointer slides between keys and releasing/starting notes accordingly. I also need to ensure audio context starts on the first user gesture before any note triggers. To avoid conflicts when the same note is held by multiple sources, I'll track note counts by source id so a note only releases once all holders let go, and I'll toggle an 'active' class on key elements to reflect sounding state visually.
/tmp/job-I9I5j6/index.html (9251 bytes)Successfully wrote to /tmp/job-I9I5j6/index.html
thinking
The runner inlines tone.min.js so the single-file requirement is satisfied, and I'm using Tone.start with PolySynth correctly. I need to double-check the note-on logic — ensuring audio initializes before triggerAttack, especially handling edge cases where release happened before the synth was ready. I'm verifying the black key positioning math against the white key boundaries, and it checks out correctly for C#, D#, and F#. I spot a sizing bug though: 8 white keys at 100px each plus padding needs 820px total width, but I only allocated 760px, so I need to widen the piano container.
{"path":"/tmp/job-I9I5j6/index.html","oldText":" position: relative; width: 760px; height: 300px;","newText":" position: relative; wid{"action":"reload"}{"action":"screenshot"}Successfully replaced 1 block(s) in /tmp/job-I9I5j6/index.html.
Frame 1, +0ms
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{"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://127.0.0.1:34643/4b7ba9ef-fdd5-44bf-91f2-4bebb777c3d3' 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":"Tone.js Piano\nClick or press a key to activate 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\nA\nC4\nW\nC♯4\nS\nD4\nE\nD♯4\nD\nE4\nF\nF4\nT\nF♯4\nG\nG4\nY\nG♯4\nH\nA4\nU\nA♯4\nJ\nB4\nK\nC5\nKeys: A W S E D F T G Y H U J K = C4 … C5 · Hold to sustain, release for envelope release","images":"attached"}
Frame 1, +0ms
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{"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://127.0.0.1:34643/4b7ba9ef-fdd5-44bf-91f2-4bebb777c3d3' 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":"Tone.js Piano\nClick or press a key to activate 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\nA\nC4\nW\nC♯4\nS\nD4\nE\nD♯4\nD\nE4\nF\nF4\nT\nF♯4\nG\nG4\nY\nG♯4\nH\nA4\nU\nA♯4\nJ\nB4\nK\nC5\nKeys: A W S E D F T G Y H U J K = C4 … C5 · Hold to sustain, release for envelope release","images":"attached"}
thinking
The screenshot checks out—piano width and black key positions line up correctly. I want to double check the mouseup safety handler, the keyboard/pointer event handling, and make sure Tone.start triggers properly on key interaction, though the CSP worker error seems harmless. I should verify press/release behavior directly: click a key and inspect the active class, then try a keyboard press. I'm also noticing a real bug in that mouseup handler—it could release a keyboard-held note if the user clicks anywhere else with no pointer active, since it's not properly scoped to pointer-only releases. I'll fix that by removing the sloppy handler and letting pointerup manage pointer-held notes exclusively.
The screenshot shows the layout is correct: 8 white and 5 black keys in the right positions, with note names and keyboard letters on each key. While reviewing the input code I found a bug. The `mouseup` safety handler releases all held voices, including computer-key notes, whenever any mouse button is released. I'll remove it, since `pointerup` and `blur` already cover stuck pointers.
{"path":"/tmp/job-I9I5j6/index.html","oldText":" // Safety: release everything if mouse button is released with no tracked pointer.\n wind{"action":"click","x":250,"y":450}{"action":"inspect"}Successfully replaced 1 block(s) in /tmp/job-I9I5j6/index.html.
Frame 1, +0ms
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{"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://127.0.0.1:34643/4b7ba9ef-fdd5-44bf-91f2-4bebb777c3d3' 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":"Tone.js Piano\nAudio active. Play the keys!\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\nA\nC4\nW\nC♯4\nS\nD4\nE\nD♯4\nD\nE4\nF\nF4\nT\nF♯4\nG\nG4\nY\nG♯4\nH\nA4\nU\nA♯4\nJ\nB4\nK\nC5\nKeys: A W S E D F T G Y H U J K = C4 … C5 · Hold to sustain, release for envelope release","images":"attached"}
Frame 1, +0ms
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{"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://127.0.0.1:34643/4b7ba9ef-fdd5-44bf-91f2-4bebb777c3d3' 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":"Tone.js Piano\nAudio active. Play the keys!\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\nA\nC4\nW\nC♯4\nS\nD4\nE\nD♯4\nD\nE4\nF\nF4\nT\nF♯4\nG\nG4\nY\nG♯4\nH\nA4\nU\nA♯4\nJ\nB4\nK\nC5\nKeys: A W S E D F T G Y H U J K = C4 … C5 · Hold to sustain, release for envelope release","images":"attached"}
thinking
Audio activated successfully with no console errors post-gesture, though the Tone.js worker CSP warning is just a harmless fallback notice. I still need to check press highlighting and keyboard playback since the screenshot shows no highlight, likely because the click released too quickly.
Audio activated after the click. Next I'll test a computer key and check the held-note state.
{"action":"key","text":"a"}{"action":"inspect"}Frame 1, +0ms
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{"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://127.0.0.1:34643/4b7ba9ef-fdd5-44bf-91f2-4bebb777c3d3' 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":"Tone.js Piano\nAudio active. Play the keys!\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\nA\nC4\nW\nC♯4\nS\nD4\nE\nD♯4\nD\nE4\nF\nF4\nT\nF♯4\nG\nG4\nY\nG♯4\nH\nA4\nU\nA♯4\nJ\nB4\nK\nC5\nKeys: A W S E D F T G Y H U J K = C4 … C5 · Hold to sustain, release for envelope release","images":"attached"}
Frame 1, +0ms
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{"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://127.0.0.1:34643/4b7ba9ef-fdd5-44bf-91f2-4bebb777c3d3' 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":"Tone.js Piano\nAudio active. Play the keys!\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\nA\nC4\nW\nC♯4\nS\nD4\nE\nD♯4\nD\nE4\nF\nF4\nT\nF♯4\nG\nG4\nY\nG♯4\nH\nA4\nU\nA♯4\nJ\nB4\nK\nC5\nKeys: A W S E D F T G Y H U J K = C4 … C5 · Hold to sustain, release for envelope release","images":"attached"}
thinking
The screenshot didn't visibly show C4 highlighted after pressing "a," and since the key tool sends keydown+keyup, any highlight would likely be transient and hard to capture anyway. I don't have a way to inspect JS state directly, so I should just be upfront that I couldn't verify the highlight, while noting the audio activation after the click seems fine. The handler logic looks sound—keydown ignores repeats, keyup releases properly, and keyboard presses trigger audio initialization before playing the note. I'm considering whether a motion-based action might capture the highlight mid-press, but given limited time, I'll try one quick motion call with the 'a' key to check.
The key press didn't show a visible highlight in the screenshot. The tool may send keydown and keyup together, so I'll try a motion capture to catch the held state.
{"action":"motion"}Frame 1, +0ms
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Frame 2, +534ms
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Frame 3, +1065ms
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Frame 4, +1603ms
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{"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://127.0.0.1:34643/4b7ba9ef-fdd5-44bf-91f2-4bebb777c3d3' 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":"Tone.js Piano\nAudio active. Play the keys!\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\nA\nC4\nW\nC♯4\nS\nD4\nE\nD♯4\nD\nE4\nF\nF4\nT\nF♯4\nG\nG4\nY\nG♯4\nH\nA4\nU\nA♯4\nJ\nB4\nK\nC5\nKeys: A W S E D F T G Y H U J K = C4 … C5 · Hold to sustain, release for envelope release","images":"attached"}
thinking
The motion frames don't show any highlight, likely because the key press and release happen instantly without capturing it visually. Rather than making more browser calls, I should verify the handlers directly in the code using grep, and I'm also unsure whether the key tool properly dispatches to the window—worth checking the pointerdown behavior on the key as well.
The motion frames show no highlight on the `a` key, so I can't confirm press highlighting visually. I'll check the handlers in the file directly.
{"command":"cd /tmp/job-I9I5j6 && grep -n \"addEventListener\\|noteOn(\\|noteOff(\\|classList\" index.html && ls -la index.html && grep -c \142: function noteOn(source, note) { 148: elByNote.get(note).classList.add('active'); 154: function noteOff(source) { 161: elByNote.get(note).classList.remove('active'); 169: for (const src of Array.from(sources.keys())) noteOff(src); 181: piano.addEventListener('pointerdown', e => { 189: noteOn('p:' + id, note); 193: window.addEventListener('pointermove', e => { 198: noteOff('p:' + e.pointerId); 202: noteOn('p:' + e.pointerId, note); 209: noteOff('p:' + e.pointerId); 211: window.addEventListener('pointerup', endPointer); 212: window.addEventListener('pointercancel', endPointer); 213: window.addEventListener('blur', () => { pointerNote.clear(); releaseAll(); }); 214: document.addEventListener('visibilitychange', () => { if (document.hidden) { pointerNote.clear(); releaseAll(); } }); 217: window.addEventListener('keydown', e => { 223: noteOn('k:' + e.code, n.note); 225: window.addEventListener('keyup', e => { 228: noteOff('k:' + e.code); 232: document.addEventListener('dragstart', e => e.preventDefault()); -rw-r--r-- 1 node node 9057 Oct 14 02:36 index.html 1
thinking
The tone.min.js script loads fine when inlined by the runner. I can't verify whether the "a" keypress actually triggered a visible highlight, so I should report that honestly rather than assume success—same goes for the audio gating queueing through ensureAudio and the pointermove glissando behavior, both of which seem fine but worth noting plainly in the report.
`index.html` is written in this directory with CSS and JS inline. The only external reference is the local `tone.min.js` script tag, which the runner will inline. **Checked in the browser:** - **Layout and labels:** The screenshots show 8 white and 5 black keys in the correct C4–C5 positions, each with a note name and its computer key. The legend lists the 13 mappings. - **Audio activation:** A click on the keyboard changed the status to "Audio active." The console showed no errors from my code. The only errors were the sandbox/CSP worker warning from Tone.js and the autoplay warning that appeared before the user gesture. - **Computer key:** I sent an `a` keypress. The screenshots did not show a visible highlight on the C4 key, so I could not confirm press highlighting visually. **Fixed during review:** I removed a `mouseup` handler that released all held notes, including keyboard-held notes, on any mouse release. **Checked by reading the code:** - Key-down calls `noteOn` and key-up calls `noteOff` with the same source ID (`k:<code>`), so each press pairs with a release. - Auto-repeat keydown events are ignored. - Pointer-down, pointer-up, and pointer-cancel pair the same way, and a pointer moving across keys retargets its note. - Window blur and tab hiding release all voices. - The synth is a PolySynth with 16 voices and an ADSR envelope. **Unverified:** - Audible sound and the envelope's attack/release behavior. - Visible key highlighting for keyboard and mouse presses. - Three-note chords and stuck-note recovery in the real browser. - Mouse and pointer interaction. I did not exercise these in the browser, only in the code.