diff --git a/cmd/sdrd/dsp_loop.go b/cmd/sdrd/dsp_loop.go
index ac41ed0..31a5a50 100644
--- a/cmd/sdrd/dsp_loop.go
+++ b/cmd/sdrd/dsp_loop.go
@@ -136,6 +136,7 @@ func runDSP(ctx context.Context, srcMgr *sourceManager, cfg config.Config, det *
 				candidateSources := buildCandidateSourceSummary(state.surveillance.Candidates)
 				candidateEvidence := buildCandidateEvidenceSummary(state.surveillance.Candidates)
 				candidateEvidenceStates := buildCandidateEvidenceStateSummary(state.surveillance.Candidates)
+				candidateWindows := buildCandidateWindowSummary(state.surveillance.Candidates, plan.MonitorWindows)
 				if len(candidateSources) > 0 {
 					debugInfo.CandidateSources = candidateSources
 				}
@@ -145,6 +146,12 @@ func runDSP(ctx context.Context, srcMgr *sourceManager, cfg config.Config, det *
 				if candidateEvidenceStates != nil {
 					debugInfo.CandidateEvidenceStates = candidateEvidenceStates
 				}
+				if len(candidateWindows) > 0 {
+					debugInfo.CandidateWindows = candidateWindows
+				}
+				if len(plan.MonitorWindowStats) > 0 {
+					debugInfo.MonitorWindowStats = plan.MonitorWindowStats
+				}
 				if hasPlan {
 					debugInfo.RefinementPlan = &plan
 				}
@@ -160,6 +167,9 @@ func runDSP(ctx context.Context, srcMgr *sourceManager, cfg config.Config, det *
 				if hasWindows {
 					refinementDebug.Windows = windowStats
 				}
+				if len(plan.MonitorWindowStats) > 0 {
+					refinementDebug.MonitorWindowStats = plan.MonitorWindowStats
+				}
 				refinementDebug.Arbitration = buildArbitrationSnapshot(state.refinement, state.arbitration)
 				debugInfo.Refinement = refinementDebug
 			}
diff --git a/cmd/sdrd/http_handlers.go b/cmd/sdrd/http_handlers.go
index 15e7073..d4d6033 100644
--- a/cmd/sdrd/http_handlers.go
+++ b/cmd/sdrd/http_handlers.go
@@ -179,6 +179,7 @@ func registerAPIHandlers(mux *http.ServeMux, cfgPath string, cfgManager *runtime
 		candidateSources := buildCandidateSourceSummary(snap.surveillance.Candidates)
 		candidateEvidence := buildCandidateEvidenceSummary(snap.surveillance.Candidates)
 		candidateEvidenceStates := buildCandidateEvidenceStateSummary(snap.surveillance.Candidates)
+		candidateWindows := buildCandidateWindowSummary(snap.surveillance.Candidates, snap.refinement.Input.Plan.MonitorWindows)
 		out := map[string]any{
 			"plan":                          snap.refinement.Input.Plan,
 			"windows":                       snap.refinement.Input.Windows,
@@ -217,6 +218,9 @@ func registerAPIHandlers(mux *http.ServeMux, cfgPath string, cfgManager *runtime
 			"candidate_sources":          candidateSources,
 			"candidate_evidence":         candidateEvidence,
 			"candidate_evidence_states":  candidateEvidenceStates,
+			"candidate_windows":          candidateWindows,
+			"monitor_windows":            snap.refinement.Input.Plan.MonitorWindows,
+			"monitor_window_stats":       snap.refinement.Input.Plan.MonitorWindowStats,
 			"display_level":              snap.surveillance.DisplayLevel,
 			"refinement_level":           snap.refinement.Input.Level,
 			"presentation_level":         snap.presentation,
diff --git a/cmd/sdrd/level_summary.go b/cmd/sdrd/level_summary.go
index 62005d7..7afa96e 100644
--- a/cmd/sdrd/level_summary.go
+++ b/cmd/sdrd/level_summary.go
@@ -43,6 +43,18 @@ type CandidateEvidenceStateSummary struct {
 	PrimaryOnly         int `json:"primary_only"`
 }
 
+type CandidateWindowSummary struct {
+	Index        int     `json:"index"`
+	Label        string  `json:"label,omitempty"`
+	Source       string  `json:"source,omitempty"`
+	StartHz      float64 `json:"start_hz,omitempty"`
+	EndHz        float64 `json:"end_hz,omitempty"`
+	CenterHz     float64 `json:"center_hz,omitempty"`
+	SpanHz       float64 `json:"span_hz,omitempty"`
+	PriorityBias float64 `json:"priority_bias,omitempty"`
+	Candidates   int     `json:"candidates"`
+}
+
 func buildSurveillanceLevelSummaries(set pipeline.SurveillanceLevelSet, spectra []pipeline.SurveillanceLevelSpectrum) map[string]SurveillanceLevelSummary {
 	if set.Primary.Name == "" && len(set.Derived) == 0 && len(set.Support) == 0 && set.Presentation.Name == "" && len(set.All) == 0 {
 		return nil
@@ -205,6 +217,50 @@ func buildCandidateEvidenceStateSummary(candidates []pipeline.Candidate) *Candid
 	return &summary
 }
 
+func buildCandidateWindowSummary(candidates []pipeline.Candidate, windows []pipeline.MonitorWindow) []CandidateWindowSummary {
+	if len(windows) == 0 {
+		return nil
+	}
+	out := make([]CandidateWindowSummary, 0, len(windows))
+	index := make(map[int]int, len(windows))
+	for _, win := range windows {
+		entry := CandidateWindowSummary{
+			Index:        win.Index,
+			Label:        win.Label,
+			Source:       win.Source,
+			StartHz:      win.StartHz,
+			EndHz:        win.EndHz,
+			CenterHz:     win.CenterHz,
+			SpanHz:       win.SpanHz,
+			PriorityBias: win.PriorityBias,
+		}
+		index[win.Index] = len(out)
+		out = append(out, entry)
+	}
+	totalCandidates := 0
+	for _, cand := range candidates {
+		matches := cand.MonitorMatches
+		if len(matches) == 0 {
+			matches = pipeline.MonitorWindowMatchesForCandidate(windows, cand)
+		}
+		for _, match := range matches {
+			idx, ok := index[match.Index]
+			if !ok {
+				continue
+			}
+			out[idx].Candidates++
+			totalCandidates++
+		}
+	}
+	if totalCandidates == 0 {
+		return nil
+	}
+	sort.Slice(out, func(i, j int) bool {
+		return out[i].Index < out[j].Index
+	})
+	return out
+}
+
 func evidenceKind(level pipeline.AnalysisLevel) string {
 	if pipeline.IsPresentationLevel(level) {
 		return "presentation"
diff --git a/cmd/sdrd/types.go b/cmd/sdrd/types.go
index aaf1098..c0655ce 100644
--- a/cmd/sdrd/types.go
+++ b/cmd/sdrd/types.go
@@ -20,6 +20,8 @@ type SpectrumDebug struct {
 	CandidateSources        map[string]int                 `json:"candidate_sources,omitempty"`
 	CandidateEvidence       []CandidateEvidenceSummary     `json:"candidate_evidence,omitempty"`
 	CandidateEvidenceStates *CandidateEvidenceStateSummary `json:"candidate_evidence_states,omitempty"`
+	CandidateWindows        []CandidateWindowSummary       `json:"candidate_windows,omitempty"`
+	MonitorWindowStats      []pipeline.MonitorWindowStats  `json:"monitor_window_stats,omitempty"`
 	RefinementPlan          *pipeline.RefinementPlan       `json:"refinement_plan,omitempty"`
 	Windows                 *RefinementWindowStats         `json:"refinement_windows,omitempty"`
 	Refinement              *RefinementDebug               `json:"refinement,omitempty"`
@@ -35,11 +37,12 @@ type RefinementWindowStats struct {
 }
 
 type RefinementDebug struct {
-	Plan        *pipeline.RefinementPlan      `json:"plan,omitempty"`
-	Request     *pipeline.RefinementRequest   `json:"request,omitempty"`
-	WorkItems   []pipeline.RefinementWorkItem `json:"work_items,omitempty"`
-	Windows     *RefinementWindowStats        `json:"windows,omitempty"`
-	Arbitration *ArbitrationSnapshot          `json:"arbitration,omitempty"`
+	Plan               *pipeline.RefinementPlan      `json:"plan,omitempty"`
+	Request            *pipeline.RefinementRequest   `json:"request,omitempty"`
+	WorkItems          []pipeline.RefinementWorkItem `json:"work_items,omitempty"`
+	Windows            *RefinementWindowStats        `json:"windows,omitempty"`
+	MonitorWindowStats []pipeline.MonitorWindowStats `json:"monitor_window_stats,omitempty"`
+	Arbitration        *ArbitrationSnapshot          `json:"arbitration,omitempty"`
 }
 
 type DecisionDebug struct {