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ableton-mcp-ai/docs/SPRINT_v0.1.18_VALIDATION_REPORT.md

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Sprint v0.1.18 Validation Report

Date: 2026-04-01
Status: ⚠️ PARTIAL IMPLEMENTATION - VALIDATION BLOCKED
Report Author: OpenCode Agent (Kimi K2)
Reviewed by: Codex

Executive Summary

Sprint v0.1.18 "Coherence-First Instrumental Mode" has partial implementation. Code changes for P0-P4 were deployed but could not be fully validated due to generation pipeline issues.

Key Blocker

The generation job (5b6a3df6e04a) became stuck at 10% progress during generating_config stage, preventing validation of the new coherence metrics schema and instrumental-only mode.

Implementation Status

✅ P0: Stable Coherence Metrics Schema - IMPLEMENTED

Changes made to server.py (after line 9196):

Added stable coherence_metrics section with:

  • family_adherence_rate: Extracted from harmonic layers
  • harmonic_layers_evaluated: Count of harmonic layers
  • manual_vocals_enabled: Set to True (manual-only policy)
  • auto_vocal_layers_enabled: Set to False (instrumental-only mode)
  • pack_coherence: Object with overall, music, drums, fx ratios
  • schema_version: "v0.1.18-stable"
  • timestamp: ISO format timestamp

Also updates layer_selections.summary with:

  • auto_vocal_layers_enabled: False
  • manual_recording_roles: ['vocal_loop', 'vocal_build', 'vocal_peak', 'vocal_shot']

Log markers added:

  • [P0_COHERENCE_METRICS] for metrics summary

Status: Code deployed, compilation successful. Not validated due to generation blocker.

✅ P1: Music Bus Coherence Hardening - IMPLEMENTED

Changes made to reference_listener.py:

  1. Added complementary role tracking (lines 5511-5521):

    • music_bus_secondary_justification: Tracks why secondary pack is needed
    • music_bus_primary_roles: Set tracking for roles in primary pack
    • MUSIC_ROLE_COMPLEMENTARY_PAIRS: Defines valid complementary pairs

  2. Enhanced _calculate_bus_aware_pack_bonus with:

    • Primary pack roles tracked when candidate matches dominant
    • Secondary pack only allowed with functional justification
    • Third pack rejection with severe penalty (0.1x)
    • Complementarity check: secondary role must complement primary roles

Justification types:

  • "complements_<roles>": When secondary serves complementary function
  • "primary_contrast": When no primary roles yet established
  • "no_clear_function": Rejected when not complementary

Log markers added:

  • [P1_MUSIC_SECONDARY] when secondary pack established
  • [P1_MUSIC_REJECT] when pack rejected for no function
  • [P1_MUSIC_THIRD_PACK] when third pack rejected

Status: Code deployed, compilation successful. Not validated due to generation blocker.

✅ P2: Instrumental-Only Mode - IMPLEMENTED

Changes made:

  1. In server.py P0 section:

    • manual_vocals_enabled: True
    • auto_vocal_layers_enabled: False
    • manual_recording_roles defined

  2. Codex previously applied:

    • MANUAL_RECORDING_ROLES in reference_listener.py
    • Filtering of vocal roles before/after selection
    • auto_vocal_layers_enabled=false in plan

Status: Code deployed. Not validated with fresh generation.

⚠️ P3: MIDI Hook and Piano Truth - PARTIALLY ADDRESSED

Current state:

  • _calculate_piano_presence() function exists and handles hybrid piano detection
  • Hook materialization logic exists in materialize_midi_hook()
  • Previous sessions show materialized: False consistently

Root cause identified: The hook requires generator._hook_materialized to be set, which only happens when materialized.get("status") == "created". Previous sessions show the hook is planned but not materialized.

Not addressed in this sprint:

  • Deep fix of hook materialization pipeline
  • Piano family selection for MIDI hook

Status: Existing code reviewed, no new changes made. Issue persists.

✅ P4: Vocal Leaks Cleanup - VERIFIED

Codex applied changes:

  • reference_listener.py: Vocals filtered before/after selection
  • server.py: Audio fallback no longer materializes vocals
  • test_piano_forward.py: Tests for vocal policy

Verified in code:

  • MANUAL_RECORDING_ROLES defined
  • Vocal roles excluded from auto-selection

Status: Codex implementation verified. No additional changes needed.

Session Analysis (Pre-Implementation)

Best Available Session: afdda4821883

Metric Value Target Status
coherence_score 6.1 >= 6.5 ❌ FAIL (-0.4)
coherence_verdict MIXED OK/STRONG ❌ FAIL
generation_mode None library-first-hybrid ❌ FAIL
library_first_mode None true ❌ FAIL
coherence_metrics Not present Required ❌ FAIL
auto_vocal_layers_enabled None false ❌ FAIL
audio_layers 0 > 0 ❌ FAIL
mandatory_midi_hook.materialized False true ❌ FAIL
vocal_layers 0 0 ✅ PASS

Analysis:

  • Session is pre-P0 implementation (no coherence_metrics section)
  • Coherence score 6.1 is close but below 6.5 threshold
  • No audio_layers suggests materialization issues
  • Hook not materialized
  • No vocal layers confirms instrumental-only working

Blockers and Issues

Primary Blocker: Generation Pipeline Stuck

Symptom: Generation job 5b6a3df6e04a stuck at 10% progress, stage generating_config.

Logs show:

  • Multiple "Parameter not found" errors from abletonmcp_init.py
  • Error in _set_device_parameter (line 1966)

Impact: Cannot validate P0-P4 implementation with fresh session.

Secondary Issues

  1. generation_mode not being set to library-first-hybrid

    • Current logic at line 8492: only sets hybrid if hook is materialized
    • Chicken-egg problem: hook needs generation to complete

  2. MIDI hook materialization failing consistently

    • Previous 5 sessions all show materialized: False
    • Need deeper investigation of hook pipeline

  3. audio_layers count is 0 in best session

    • Suggests materialization failing silently
    • Or audio fallback not being triggered

Recommendations for Next Sprint (v0.1.19)

Critical Fixes Needed

  1. Fix Generation Pipeline Stalling

    • Debug "Parameter not found" error in _set_device_parameter
    • Add timeout and recovery to generation stages
    • Ensure config generation doesn't block indefinitely

  2. Decouple generation_mode from hook materialization

    • Set generation_mode: library-first-hybrid when reference provided
    • Validate hook separately, don't block mode assignment

  3. Fix Audio Fallback Materialization

    • Investigate why audio_layers is 0
    • Ensure library-first mode actually materializes audio
    • Add validation that audio tracks are created

  4. MIDI Hook Materialization

    • Debug why hook consistently shows materialized: False
    • Ensure mark_hook_materialized() is called correctly
    • Verify track creation in Ableton

  5. Validate P0 Schema

    • Once generation works, verify coherence_metrics structure
    • Ensure all required fields present:
      • family_adherence_rate
      • pack_coherence (overall, music, drums, fx)
      • manual_vocals_enabled
      • auto_vocal_layers_enabled

Threshold Compliance (Current Best)

Threshold Required Best Session (afdda4821883) Gap
coherence_score >= 6.5 6.1 -0.4
generation_mode library-first-hybrid None N/A
mandatory_midi_hook.materialized true False N/A
pack_coherence.music >= 0.65 Not present N/A
pack_coherence.overall >= 0.50 Not present N/A
family_adherence_rate >= 0.60 Not present N/A
auto_vocal_layers_enabled false None N/A

Compliance: 0/7 thresholds met

Code Locations

P0 Implementation

  • server.py lines ~9200-9230: Coherence metrics schema

P1 Implementation

  • reference_listener.py lines ~5511-5521: Secondary pack tracking
  • reference_listener.py lines ~5417-5480: Bus-aware bonus with justification

P2/P4 Implementation (Codex)

  • reference_listener.py: MANUAL_RECORDING_ROLES
  • server.py: Audio fallback vocal exclusion

P3 Existing Code

  • server.py line 773: _calculate_piano_presence()
  • server.py line 4743: materialize_midi_hook()

Conclusion

Sprint v0.1.18 is NOT COMPLETE.

While P0-P4 code implementations were deployed and compile successfully, the sprint cannot be closed because:

  1. Generation pipeline is blocked - Cannot create fresh session to validate changes
  2. No session meets thresholds - Best available (afdda4821883) scores 6.1/6.5
  3. Core functionality not working - Hook materialization, audio fallback both failing

What Works

  • ✅ Code compiles without errors
  • ✅ P0 schema code deployed
  • ✅ P1 music bus hardening deployed
  • ✅ P2 instrumental-only flags set
  • ✅ P4 vocal manual-only policy in place

What Doesn't Work

  • ❌ Generation stalls at 10%
  • ❌ Hook not materializing
  • ❌ Audio layers not created
  • ❌ Cannot validate metrics

Required for Closure

A fresh generation that:

  1. Completes without stalling
  2. Creates audio layers (>0)
  3. Materializes MIDI hook
  4. Shows coherence_score >= 6.5
  5. Has generation_mode = library-first-hybrid
  6. Contains coherence_metrics section with all required fields

Report Generated: 2026-04-01
Code Changes: Deployed, compiled, not validated
Next Action Required: Fix generation pipeline, then re-run validation

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