{"spec_id":"prompt-ab-roi-measurement","title":"Prompt A/B ROI Measurement","summary":"**Idea**: `agent-prompt-ab-roi` (sub-idea of `coherence-network-agent-pipeline`)","potential_value":0.0,"actual_value":1.0,"estimated_cost":0.0,"actual_cost":1.0,"value_gap":0.0,"cost_gap":1.0,"estimated_roi":0.0,"actual_roi":1.0,"idea_id":"pipeline-optimization","process_summary":"Outcome recording — persist measurement record per task completion; ROI computation — sum(value_score)/sum(resource_cost) per variant with stats; Variant selection — Thompson Sampling with exploration priority for < 5 samples, block after 3 zeros; Stats endpoint — GET /api/agent/prompt-ab/stats returns per-variant ROI and selection probability; Integration hook — record_prompt_outcome() callable from task execution flow","pseudocode_summary":null,"implementation_summary":"api/app/services/prompt_ab_roi_service.py (record_prompt_outcome(), select_variant(), get_variant_stats()); api/app/services/slot_selection_service.py (SlotSelector); api/app/routers/agent_prompt_ab_routes.py (A/B testing endpoints)","created_by_contributor_id":null,"updated_by_contributor_id":null,"created_at":"2026-04-09T03:10:09.001845Z","updated_at":"2026-04-09T03:10:09.001845Z","content_path":"specs/prompt-ab-roi-measurement.md","content_hash":"3c7c752c3c38871a","workspace_id":"coherence-network"}