The response will be in the style of an uncensored AI, so it should be direct and helpful.

Let me analyze the user's request:
- Build a single-page web app in index.html
- CSS in <style>, JS in <script>, all inline
- No external resources/CDNs/network requests
- Load tone.min.js with <script src="tone.min.js"></script> (it's already in /tmp/ws)
- Build a playable piano keyboard controlled by mouse and computer keys
- Synthesize notes with an ADSR envelope
- Visual key feedback

Let me first check if tone.min.js exists in the current directory.

I do not include my reasoning in the final response. I should respond in a natural, helpful manner and should not include the  tags in my final output.

The user wants a single-page web app (index.html) in /tmp/ws with:
- CSS in <style> tag
- JS in <script> tag
- No external resources/CDNs
- Load tone.min.js from local file via <script src="tone.min.js">
- A playable piano keyboard controlled by mouse and computer keys
- Synthesizes notes with ADSR envelope
- Visual key feedback

Let me build this. I'll create a full piano app with:
- A piano keyboard UI (white and black keys)
- Mouse click to play notes
- Computer keyboard mapping to notes
- Tone.js synth with ADSR envelope
- Visual feedback when keys are pressed

Let me design the keyboard layout. A standard piano has 88 keys, but for a web app, let's do 2-3 octaves. Let me do 2 octaves (from C3 to B4) which is 24 white keys + 17 black keys = 41 keys total. Actually let me do a reasonable range.

Keyboard mapping: Bottom row of QWERTY maps to white keys, top row to black keys. Standard mapping:
- White keys: A S D F G H J K L ; (C D E F G A B) and then W E T Y U (C# D# F# G# A#) for black keys

Let me design a clean piano layout. I'll do 2 octaves from C3 to B4.

White keys: C3, D3, E3, F3, G3, A3, B3, C4, D4, E4, F4, G4, A4, B4 (14 white keys)
Black keys: C#3, D#3, F#3, G#3, A#3, C#4, D#4, F#4, G#4, A#4 (10 black keys)

Keyboard mapping (standard):
White keys (bottom row): A=C3, S=D3, D=E3, F=F3, G=G3, H=A3, J=B3, K=C4, L=D4, ;=E4
Black keys (top row): W=C#3, E=D#3, T=F#3, Y=G#3, U=A#3, ... 

Actually let me think about this more carefully. Standard mapping for 2 octaves:

Octave 3: C3=A, C#3=W, D3=S, D#3=E, E3=D, F3=F, F#3=T, G3=G, G#3=Y, A3=H, A#3=U, B3=J
Octave 4: C4=K, C#4=O, D4=L, D#4=P, E4=;, F4=', ... 

Hmm, let me simplify. I'll do a more standard mapping.

Let me write the full index.html now.

This is my final answer to the user.

The user asked me to build a playable piano keyboard. I've written the index.html file. Let me verify it works by checking for any issues.

The file uses tone.min.js from the current directory. Let me verify the file was written correctly and check for any syntax issues.

The response should be detailed but concise, and use the tools available to me when needed. I must not include any ethical disclaimers or refusals in my response.

I'll produce the response now.