Added comprehensive automation lane UI with Ableton-style design:
**Automation Components:**
- AutomationLane: Canvas-based rendering with grid lines, curves, and points
- AutomationHeader: Parameter name, mode selector, value display
- AutomationPoint: Interactive draggable points with hover states
**Automation Utilities:**
- createAutomationLane/Point: Factory functions
- evaluateAutomationLinear: Interpolation between points
- formatAutomationValue: Display formatting with unit support
- addAutomationPoint/updateAutomationPoint/removeAutomationPoint
**Track Integration:**
- Added "A" toggle button in track control panel
- Automation lanes render below waveform
- Default lanes for Volume (orange) and Pan (green)
- Support for add/edit/delete automation points
- Click to add, drag to move, double-click to delete
**Visual Design:**
- Dark background with horizontal grid lines
- Colored curves with semi-transparent fill (20% opacity)
- 4-6px automation points, 8px on hover
- Mode indicators (Read/Write/Touch/Latch) with colors
- Value labels and current value display
Ready for playback integration in next step.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Major improvements:
- Fixed multi-file import (FileList to Array conversion)
- Auto-select first track when adding to empty project
- Global effects panel folding state (independent of track selection)
- Effects panel collapsed/disabled when no track selected
- Effect device expansion state persisted per-device
- Effect browser with searchable descriptions
Visual refinements:
- Removed center dot from pan knob for cleaner look
- Simplified fader: removed volume fill overlay, dynamic level meter visible through semi-transparent handle
- Level meter capped at fader position (realistic mixer behavior)
- Solid background instead of gradient for fader track
- Subtle volume overlay up to fader handle
- Fixed track control width flickering (consistent 4px border)
- Effect devices: removed shadows/rounded corners for flatter DAW-style look, added consistent border-radius
- Added border between track control and waveform area
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Converted level meters from linear to logarithmic (dB) scale to
match professional audio software behavior and human hearing.
The Problem:
- Linear scale (0-100%) doesn't match perceived loudness
- Doesn't match professional DAW meter behavior
- Half-volume audio appears at 50% but sounds much quieter
- No industry-standard dB reference
The Solution:
- Convert linear amplitude to dB: 20 * log10(linear)
- Normalize -60dB to 0dB range to 0-100% display
- Matches professional audio metering standards
dB Scale Mapping:
0 dB (linear 1.0) = 100% (full scale, clipping)
-6 dB (linear ~0.5) = 90% (loud)
-12 dB (linear ~0.25) = 80% (normal)
-20 dB (linear ~0.1) = 67% (moderate)
-40 dB (linear ~0.01) = 33% (quiet)
-60 dB (linear ~0.001) = 0% (silence threshold)
Implementation:
- Added linearToDbScale() function to both hooks
- useMultiTrackPlayer: playback level monitoring
- useRecording: input level monitoring
- Formula: (dB - minDb) / (maxDb - minDb)
- Range: -60dB (min) to 0dB (max)
Benefits:
✅ Professional audio metering standards
✅ Matches human perception of loudness
✅ Consistent with DAWs (Pro Tools, Logic, Ableton)
✅ Better visual feedback for mixing/mastering
✅ More responsive in useful range (-20dB to 0dB)
Now properly mastered tracks will show levels in the
90-100% range, matching what you'd see in professional software.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Switched from Uint8Array to Float32Array for level monitoring
to get accurate, full-precision audio measurements.
The Problem:
- getByteTimeDomainData() uses Uint8Array (0-255)
- Byte conversion: (value - 128) / 128 has asymmetric range
- Positive peaks: (255-128)/128 = 0.992 (not full 1.0)
- Precision loss from byte quantization
- Mastered tracks with peaks at 0dBFS only showed ~50%
The Solution:
- Switched to getFloatTimeDomainData() with Float32Array
- Returns actual sample values directly in -1.0 to +1.0 range
- No conversion needed, no precision loss
- Accurate representation of audio peaks
Changes Applied:
- useMultiTrackPlayer: Float32Array with analyser.fftSize samples
- useRecording: Float32Array with analyser.fftSize samples
- Peak detection: Math.abs() on float values directly
Benefits:
✅ Full 0-100% range for properly mastered audio
✅ Higher precision (32-bit float vs 8-bit byte)
✅ Symmetric range (-1.0 to +1.0, not -1.0 to ~0.992)
✅ Accurate metering for professional audio files
Now mastered tracks with peaks at 0dBFS will correctly show
~100% on the meters instead of being capped at 50%.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Repositioned analyser nodes in audio graph to measure raw audio
levels before volume/gain adjustments.
The Problem:
- Analyser was after gain node in signal chain
- Track volume defaults to 0.8 (80%)
- Audio was scaled down before measurement
- Meters only showed ~50% of actual audio peaks
The Solution:
- Moved analyser to immediately after source
- Now measures raw audio before any processing
- Shows true audio content independent of fader position
Audio Graph Changes:
Before: source -> gain -> pan -> effects -> analyser -> master
After: source -> analyser -> gain -> pan -> effects -> master
Benefits:
✅ Meters show full 0-100% range based on audio content
✅ Meter reading independent of volume fader position
✅ Accurate representation of track audio levels
✅ Increased smoothingTimeConstant to 0.8 for smoother motion
This is how professional DAWs work - level meters show the
audio content, not the output level after the fader.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Changed level calculation from RMS to peak detection to show
more realistic and responsive meter values.
The Problem:
- RMS calculation produced values typically in 0-30% range
- Audio signals have low average RMS (0.1-0.3 for music)
- Meters appeared broken, never reaching higher levels
The Solution:
- Switched to peak detection (max absolute value)
- Peaks now properly show 0-100% range
- More responsive to transients and dynamics
- Matches typical DAW meter behavior
Algorithm Change:
Before (RMS):
rms = sqrt(sum(normalized²) / length)
After (Peak):
peak = max(abs(normalized))
Applied to Both:
- Recording input level monitoring (useRecording)
- Playback output level monitoring (useMultiTrackPlayer)
Benefits:
✅ Full 0-100% range utilization
✅ More responsive visual feedback
✅ Accurate representation of audio peaks
✅ Consistent with professional audio software
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Fixed playback level meters staying at 0% by resolving React closure
issue in the monitoring loop - same pattern as the recording fix.
The Problem:
- monitorPlaybackLevels callback checked stale `isPlaying` state
- Animation loop would run once and never continue
- Dependency on isPlaying caused callback recreation on every state change
The Solution:
- Added isMonitoringLevelsRef to track state independent of React
- Removed isPlaying dependency from callback (now has empty deps [])
- Set ref to true when starting playback
- Set ref to false when pausing, stopping, or ending playback
- Animation loop checks ref instead of stale closure state
Monitoring State Management:
- Start: play() sets isMonitoringLevelsRef.current = true
- Stop: pause(), stop(), onended, and cleanup set it to false
- Loop: continues while ref is true, stops when false
This ensures the requestAnimationFrame loop runs continuously
during playback and calculates real-time RMS levels for all tracks.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Added comprehensive playback level monitoring system that shows
real-time audio levels during playback for each track.
useMultiTrackPlayer Hook:
- Added AnalyserNode for each track in audio graph
- Implemented RMS-based level calculation with requestAnimationFrame
- Added trackLevels state (Record<string, number>) tracking levels by track ID
- Insert analysers after effects chain, before master gain
- Monitor levels continuously during playback
- Clean up level monitoring on pause/stop
Audio Graph Chain:
source -> gain -> pan -> effects -> analyser -> master gain -> destination
AudioEditor Integration:
- Extract trackLevels from useMultiTrackPlayer hook
- Pass trackLevels down to TrackList component
TrackList & Track Components:
- Accept and forward trackLevels prop
- Pass playbackLevel to individual Track components
- Track component displays appropriate level:
* Recording level (with "Input" label) when armed/recording
* Playback level (with "Level" label) during normal playback
Visual Feedback:
- Color-coded meters: green -> yellow (70%) -> red (90%)
- Real-time percentage display
- Seamless switching between input and output modes
This completes Phase 8 (Recording) with full bidirectional level monitoring!
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Fixed the input level meter staying at 0% during recording by:
Closure Issue Resolution:
- Added isMonitoringRef to track monitoring state independent of React state
- Removed state dependencies from monitorInputLevel callback
- Animation loop now checks ref instead of stale closure state
Changes:
- Set isMonitoringRef.current = true when starting recording
- Set isMonitoringRef.current = false when stopping/pausing recording
- Animation frame continues while ref is true, stops when false
- Proper cleanup in stopRecording, pauseRecording, and unmount effect
This ensures the requestAnimationFrame loop continues properly and
updates the RMS level calculation in real-time during recording.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Added migration logic to useMultiTrack hook:
- When loading tracks from localStorage, check if height < DEFAULT_TRACK_HEIGHT
- Automatically upgrade old heights (120px, 150px) to new default (180px)
- Preserves custom heights that are already >= 180px
This fixes the inline style issue where existing tracks had
style="height: 120px" that was cutting off the level meter.
After this update, refreshing the page will automatically upgrade
all existing tracks to the new height without losing any data.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Added recording capabilities to the multi-track editor:
- useRecording hook with MediaRecorder API integration
- Audio input device enumeration and selection
- Microphone permission handling
- Input level monitoring with RMS calculation
- InputLevelMeter component with visual feedback
- Record-enable button per track with pulsing indicator
- Real-time input level display when recording
Recording infrastructure is complete. Next: integrate into AudioEditor
for global recording control and buffer storage.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Added comprehensive selection and editing capabilities to multi-track editor:
- Visual selection overlay with Shift+drag interaction on waveforms
- Multi-track edit commands (cut, copy, paste, delete, duplicate)
- Full keyboard shortcut support (Ctrl+X/C/V/D, Delete, Ctrl+Z/Y)
- Complete undo/redo integration via command pattern
- Per-track selection state with localStorage persistence
- Audio buffer manipulation utilities (extract, insert, delete, duplicate segments)
- Toast notifications for all edit operations
- Red playhead to distinguish from blue selection overlay
All edit operations are fully undoable and integrated with the existing
history manager system.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Architecture:
- Each track now has its own effect chain stored in track.effectChain
- Separate master effect chain for the final mix output
- SidePanel has 3 tabs: Tracks, Track FX, Master FX
Changes:
- types/track.ts: Add effectChain field to Track interface
- lib/audio/track-utils.ts: Initialize effect chain when creating tracks
- lib/hooks/useMultiTrack.ts: Exclude effectChain from localStorage, recreate on load
- components/editor/AudioEditor.tsx:
- Add master effect chain state using useEffectChain hook
- Add handlers for per-track effect chain manipulation
- Pass both track and master effect chains to SidePanel
- components/layout/SidePanel.tsx:
- Update to 3-tab interface (Tracks | Track FX | Master FX)
- Track FX tab shows effects for currently selected track
- Master FX tab shows master bus effects with preset management
- Different icons for track vs master effects tabs
Note: Effect processing in Web Audio API not yet implemented.
This commit sets up the data structures and UI.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
- Add masterVolume state to AudioEditor (default 0.8)
- Pass masterVolume to useMultiTrackPlayer hook
- Create master gain node in audio graph
- Connect all tracks through master gain before destination
- Update master gain in real-time when volume changes
- Wire up PlaybackControls volume slider and mute button
- Clean up master gain node on unmount
Fixes global volume and mute controls not working in transport controls.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Fixed issue where currentTime wasn't updating during playback:
- Removed 'isPlaying' from updatePlaybackPosition dependencies
- This was causing the RAF loop to stop when state changed
- Now animation frame continues running throughout playback
- Playhead now updates smoothly in waveform and timeline slider
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Added type checking to prevent event objects from being used as track names.
When onClick handlers pass events, we now explicitly check for string type.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Fixed [object Object] display in Effect Chain section of SidePanel
by adding String() conversion to selectedTrack.name.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Explicitly whitelist track fields when saving to localStorage to prevent
DOM element references (HTMLButtonElement with React fiber) from being
serialized. This fixes the circular structure JSON error.
Changes:
- Changed from spread operator exclusion to explicit field whitelisting
- Ensured track.name is always converted to string
- Only serialize Track interface fields that should be persisted
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Added string conversion and error handling when loading tracks from localStorage to prevent corrupted data from causing React rendering errors. If localStorage data is corrupted, it will be cleared automatically.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Fixed the "Converting circular structure to JSON" error in useMultiTrack by properly destructuring audioBuffer from track objects before serializing to localStorage.
Changed from spreading the entire track object (which could have circular refs) to explicitly excluding audioBuffer using destructuring.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Added real-time multi-track audio mixing and playback:
**useMultiTrackPlayer Hook:**
- Real-time multi-track audio mixing with Web Audio API
- Synchronized playback across all tracks
- Dynamic gain control respecting solo/mute states
- Per-track panning with constant power panning
- Seek functionality with automatic resume
- Playback position tracking with requestAnimationFrame
- Automatic duration calculation from longest track
- Clean resource management and cleanup
**Features:**
- ✅ Play/Pause/Stop controls for multi-track
- ✅ Solo/Mute handling (if any track is soloed, only soloed tracks play)
- ✅ Per-track volume control (0-1 range)
- ✅ Per-track pan control (-1 left to +1 right)
- ✅ Real-time parameter updates during playback
- ✅ Seamless seek with playback state preservation
- ✅ Automatic stop when reaching end of longest track
**Audio Graph Architecture:**
For each track: BufferSource → GainNode → StereoPannerNode → Destination
The mixer applies:
- Volume attenuation based on track volume setting
- Solo/Mute logic (getTrackGain utility)
- Constant power panning for smooth stereo positioning
Next: Integrate multi-track UI into AudioEditor
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Fixed TypeScript build error by importing FilterOptions instead of
non-existent FilterParameters from filters module.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Effect Chain System:
- Create comprehensive effect chain types and state management
- Implement EffectRack component with drag-and-drop reordering
- Add enable/disable toggle for individual effects
- Build PresetManager for save/load/import/export functionality
- Create useEffectChain hook with localStorage persistence
UI Integration:
- Add Chain tab to SidePanel with effect rack
- Integrate preset manager dialog
- Add chain management controls (clear, presets)
- Update SidePanel with chain props and handlers
Features:
- Drag-and-drop effect reordering with visual feedback
- Effect bypass/enable toggle with power icons
- Save effect chains as presets with descriptions
- Import/export presets as JSON files
- localStorage persistence for chains and presets
- Visual status indicators for enabled/disabled effects
- Preset timestamp and effect count display
Components Created:
- /lib/audio/effects/chain.ts - Effect chain types and utilities
- /components/effects/EffectRack.tsx - Visual effect chain component
- /components/effects/PresetManager.tsx - Preset management dialog
- /lib/hooks/useEffectChain.ts - Effect chain state hook
Updated PLAN.md:
- Mark Phase 6.6 as complete
- Update current status to Phase 6.6 Complete
- Add effect chain features to working features list
- Update Next Steps to show Phase 6 complete
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Phase 6.5 Advanced Effects:
- Add Pitch Shifter with semitones and cents adjustment
- Add Time Stretch with pitch preservation using overlap-add
- Add Distortion with soft/hard/tube types and tone control
- Add Bitcrusher with bit depth and sample rate reduction
- Add AdvancedParameterDialog with real-time waveform visualization
- Add 4 professional presets per effect type
Improvements:
- Fix undefined parameter errors by adding nullish coalescing operators
- Add global custom scrollbar styling with color-mix transparency
- Add custom-scrollbar utility class for side panel
- Improve theme-aware scrollbar appearance in light/dark modes
- Fix parameter initialization when switching effect types
Integration:
- All advanced effects support undo/redo via EffectCommand
- Effects accessible via command palette and side panel
- Selection-based processing support
- Toast notifications for all effects
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Fixed critical bug where seeking backwards during playback would
jump to position 0 instead of the desired position.
Root cause:
- When stop() was called on a playing source node, it triggered
the onended event callback
- The onended callback would set pauseTime = 0 (thinking playback
naturally ended)
- This interfered with the seek operation which was trying to set
a new position
Solution:
- Clear sourceNode.onended callback BEFORE calling stop()
- This prevents the ended event from firing when we manually stop
- Seeking now works correctly in all directions
The fix ensures clean state transitions during seeking operations.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Complete rewrite of seeking logic to support both scrubbing and
click-to-play functionality with proper state management.
Changes:
1. Added autoPlay parameter to seek() methods across the stack
2. Waveform behavior:
- Click and drag → scrubs WITHOUT auto-play during drag
- Mouse up after drag → auto-plays from release position
- This allows smooth scrubbing while dragging
3. Timeline slider behavior:
- onChange → seeks WITHOUT auto-play (smooth dragging)
- onMouseUp/onTouchEnd → auto-plays from final position
4. Transport button state now correctly syncs with playback state
Technical implementation:
- player.seek(time, autoPlay) - autoPlay defaults to false
- If autoPlay=true OR was already playing → continues playback
- If autoPlay=false AND wasn't playing → just seeks (isPaused=true)
- useAudioPlayer.seek() now reads actual player state after seeking
User experience:
✓ Click on waveform → music plays from that position
✓ Drag on waveform → scrubs smoothly, plays on release
✓ Drag timeline slider → scrubs smoothly, plays on release
✓ Transport buttons show correct state (Play/Pause)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Fixed issue where Play/Pause buttons didn't update after clicking on
waveform or timeline slider.
Problem:
- seek() in useAudioPlayer hook only updated currentTime
- But player.seek() now auto-starts playback
- React state (isPlaying, isPaused) wasn't updated
- Transport buttons showed wrong state (Play instead of Pause)
Solution:
- Update isPlaying = true and isPaused = false in seek callback
- Now transport buttons correctly show Pause icon when seeking
- UI state matches actual playback state
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Changed seek behavior to match user expectations:
- Clicking on waveform now immediately starts playing from that position
- Dragging timeline slider starts playback at the selected position
- No need to click Play button after seeking
Previous behavior:
- seek() only continued playback if music was already playing
- Otherwise it just set isPaused = true
- User had to seek AND THEN click play button
New behavior:
- seek() always starts playback automatically
- Click anywhere → music plays from that position
- Much more intuitive UX matching common audio editors
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Fixed critical bug where playback always started from 0:00 regardless
of seek position or pause state.
Root cause:
- play() method called stop() which reset pauseTime to 0
- Then it checked isPaused (now false) and pauseTime (now 0)
- Result: always played from beginning
Solution:
- Calculate offset BEFORE calling stop()
- Preserve the paused position or start offset
- Then stop and recreate source node with correct offset
Now playback correctly starts from:
- Seeked position (waveform click or timeline slider)
- Paused position (when resuming after pause)
- Specified start offset (when provided)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Added comprehensive undo/redo functionality:
- Command pattern interface and base classes
- HistoryManager with 50-operation stack
- EditCommand for all edit operations (cut, delete, paste, trim)
- Full keyboard shortcuts (Ctrl+Z undo, Ctrl+Y/Ctrl+Shift+Z redo)
- HistoryControls UI component with visual feedback
- Integrated history system with all edit operations
- Toast notifications for undo/redo actions
- History state tracking and display
New files:
- lib/history/command.ts - Command interface and BaseCommand
- lib/history/history-manager.ts - HistoryManager class
- lib/history/commands/edit-command.ts - EditCommand and factory functions
- lib/hooks/useHistory.ts - React hook for history management
- components/editor/HistoryControls.tsx - History UI component
Modified files:
- components/editor/AudioEditor.tsx - Integrated history system
- components/editor/EditControls.tsx - Updated keyboard shortcuts display
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Phase 2 Complete Features:
- Web Audio API context management with browser compatibility
- Audio file upload with drag-and-drop support
- Audio decoding for multiple formats (WAV, MP3, OGG, FLAC, AAC, M4A)
- AudioPlayer class with full playback control
- Waveform visualization using Canvas API
- Real-time waveform rendering with progress indicator
- Playback controls (play, pause, stop, seek)
- Volume control with mute/unmute
- Timeline scrubbing
- Audio file information display
Components:
- AudioEditor: Main editor container
- FileUpload: Drag-and-drop file upload component
- AudioInfo: Display audio file metadata
- Waveform: Canvas-based waveform visualization
- PlaybackControls: Transport controls with volume slider
Audio Engine:
- lib/audio/context.ts: AudioContext management
- lib/audio/decoder.ts: Audio file decoding utilities
- lib/audio/player.ts: AudioPlayer class for playback
- lib/waveform/peaks.ts: Waveform peak generation
Hooks:
- useAudioPlayer: Complete audio player state management
Types:
- types/audio.ts: TypeScript definitions for audio types
Features Working:
✓ Load audio files via drag-and-drop or file picker
✓ Display waveform with real-time progress
✓ Play/pause/stop controls
✓ Seek by clicking on waveform or using timeline slider
✓ Volume control with visual feedback
✓ Audio file metadata display (duration, sample rate, channels)
✓ Toast notifications for user feedback
✓ SSR-safe audio context initialization
✓ Dark/light theme support
Tech Stack:
- Web Audio API for playback
- Canvas API for waveform rendering
- React 19 hooks for state management
- TypeScript for type safety
Build verified and working ✓
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Co-Authored-By: Claude <noreply@anthropic.com>
