diff --git a/frontend/src/api.ts b/frontend/src/api.ts
index 08211ea..9d7b561 100644
--- a/frontend/src/api.ts
+++ b/frontend/src/api.ts
@@ -485,11 +485,19 @@ export function revokeAuthToken(config: FrontendConfig, refreshToken?: string) {
 }
 
 export function getLearnerMasteryHistory(config: FrontendConfig, studentId: string, days = 30) {
-  return requestJson<MasteryHistoryResponse>(config, `/api/learners/${studentId}/mastery-history?days=${days}`)
+  return requestJson<MasteryHistoryResponse>(
+    config,
+    `/api/learners/${studentId}/mastery-history?days=${days}`,
+    { headers: buildHeaders(config, false) },
+  )
 }
 
 export function getSectionMasteryTrends(config: FrontendConfig, sectionId: string, days = 30) {
-  return requestJson<SectionMasteryTrendsResponse>(config, `/api/teachers/sections/${sectionId}/mastery-trends?days=${days}`)
+  return requestJson<SectionMasteryTrendsResponse>(
+    config,
+    `/api/teachers/sections/${sectionId}/mastery-trends?days=${days}`,
+    { headers: buildHeaders(config, false) },
+  )
 }
 
 // ---------------------------------------------------------------------------
diff --git a/frontend/src/lib/copy.ts b/frontend/src/lib/copy.ts
index 4ec7c08..a29100a 100644
--- a/frontend/src/lib/copy.ts
+++ b/frontend/src/lib/copy.ts
@@ -263,3 +263,46 @@ export function teacherRemediationPhase(phase: string | null | undefined, backen
 export function teacherProgressionAction(action: string | null | undefined, backendLabel?: string | null): string {
   return lookup(teacherProgressionActionLabels, action, undefined, backendLabel)
 }
+
+// ---------------------------------------------------------------------------
+// Mastery / evidence signals
+// ---------------------------------------------------------------------------
+
+const teacherMasterySignalLabels: Record<string, string> = {
+  insufficient: 'Insufficient data',
+  improving: 'Improving',
+  stable: 'Stable',
+  declining: 'Declining',
+  strong: 'Strong',
+  weak: 'Weak',
+}
+
+const teacherEvidenceSignalLabels: Record<string, string> = {
+  steady: 'Steady',
+  improving: 'Improving',
+  declining: 'Declining',
+  strong: 'Strong',
+  weak: 'Weak',
+  struggling: 'Struggling',
+  progressing: 'Progressing',
+}
+
+const teacherProgressSignalLabels: Record<string, string> = {
+  insufficient: 'Insufficient data',
+  advancing: 'Advancing',
+  stalled: 'Stalled',
+  regressing: 'Regressing',
+  steady: 'Steady',
+}
+
+export function teacherMasterySignal(signal: string | null | undefined, backendLabel?: string | null): string {
+  return lookup(teacherMasterySignalLabels, signal, undefined, backendLabel)
+}
+
+export function teacherEvidenceSignal(signal: string | null | undefined, backendLabel?: string | null): string {
+  return lookup(teacherEvidenceSignalLabels, signal, undefined, backendLabel)
+}
+
+export function teacherProgressSignal(signal: string | null | undefined, backendLabel?: string | null): string {
+  return lookup(teacherProgressSignalLabels, signal, undefined, backendLabel)
+}
diff --git a/frontend/src/sample-data.ts b/frontend/src/sample-data.ts
index 32f9c5c..6cfe3da 100644
--- a/frontend/src/sample-data.ts
+++ b/frontend/src/sample-data.ts
@@ -768,6 +768,11 @@ export const demoGenerationHistory: LearnerGenerationHistoryEntry[] = [
     active_target_kc_ids: ['KC-1'],
     intervention_type: 'targeted_practice',
     rationale: 'Generated a final bridge example before the learner moves into transfer practice.',
+    mastery_signal: 'improving',
+    mastery_confidence: 0.72,
+    progress_signal: 'advancing',
+    evidence_signal: 'progressing',
+    evidence_rationale: 'Learner showed consistent improvement on fraction equivalence over the last three problems.',
     next_step: demoGeneration.workflow_summary?.next_step ?? demoProfileSummary.current_flow.next_step,
     continue_action: practiceContinueAction,
     created_at: '2026-03-16T08:50:00Z',
@@ -785,6 +790,11 @@ export const demoGenerationHistory: LearnerGenerationHistoryEntry[] = [
     active_target_kc_ids: ['KC-1'],
     intervention_type: 'step_back',
     rationale: 'Started remediation by rebuilding the prerequisite whole-model concept.',
+    mastery_signal: 'declining',
+    mastery_confidence: 0.55,
+    progress_signal: 'stalled',
+    evidence_signal: 'struggling',
+    evidence_rationale: 'Repeated errors on whole-model prerequisite suggest foundational gap.',
     next_step: {
       action: 'deliver',
       content_type: 'worked_example',
diff --git a/frontend/src/types.ts b/frontend/src/types.ts
index 703ef6d..0cc9226 100644
--- a/frontend/src/types.ts
+++ b/frontend/src/types.ts
@@ -687,6 +687,11 @@ export interface LearnerGenerationHistoryEntry {
   active_target_kc_ids: string[]
   intervention_type?: string | null
   rationale?: string | null
+  mastery_signal: string
+  mastery_confidence: number
+  progress_signal: string
+  evidence_signal: string
+  evidence_rationale?: string | null
   next_step: LearnerFlowNextStep
   continue_action: LearnerContinueAction
   created_at: string
diff --git a/frontend/src/views/learner/History.test.tsx b/frontend/src/views/learner/History.test.tsx
index a0a8552..8947528 100644
--- a/frontend/src/views/learner/History.test.tsx
+++ b/frontend/src/views/learner/History.test.tsx
@@ -30,6 +30,10 @@ const generations: LearnerGenerationHistoryEntry[] = [
     target_stage: 'target',
     active_target_kc_ids: [],
     rationale: 'Explained fractions',
+    mastery_signal: 'insufficient',
+    mastery_confidence: 0,
+    progress_signal: 'insufficient',
+    evidence_signal: 'steady',
     next_step: nextStep,
     continue_action: continueAction,
     created_at: '2026-03-17T10:00:00Z',
@@ -44,6 +48,10 @@ const generations: LearnerGenerationHistoryEntry[] = [
     target_stage: 'transfer',
     active_target_kc_ids: [],
     rationale: 'Practice problems',
+    mastery_signal: 'improving',
+    mastery_confidence: 0.8,
+    progress_signal: 'advancing',
+    evidence_signal: 'progressing',
     next_step: nextStep,
     continue_action: continueAction,
     created_at: '2026-03-17T09:00:00Z',
diff --git a/frontend/src/views/teacher/LearnerDetail.tsx b/frontend/src/views/teacher/LearnerDetail.tsx
index b9cb8c1..522eb88 100644
--- a/frontend/src/views/teacher/LearnerDetail.tsx
+++ b/frontend/src/views/teacher/LearnerDetail.tsx
@@ -31,6 +31,9 @@ import {
   teacherArtifact,
   teacherProgressionAction,
   teacherRemediationPhase,
+  teacherMasterySignal,
+  teacherEvidenceSignal,
+  teacherProgressSignal,
 } from '../../lib/copy'
 import { formatPercent, formatTimestamp, titleCase } from '../../lib/formatters'
 import { asMessage } from '../../lib/formatters'
@@ -516,6 +519,11 @@ function TimelineLabel({ entry }: { entry: TimelineEntry }) {
           <Badge variant="outline" className="text-[10px] px-1.5 py-0">
             {teacherStage(g.target_stage)}
           </Badge>
+          {g.mastery_signal !== 'insufficient' && (
+            <Badge variant="outline" className={`text-[10px] px-1.5 py-0 ${masteryBadgeColor(g.mastery_signal)}`}>
+              {teacherMasterySignal(g.mastery_signal)}
+            </Badge>
+          )}
           {g.rationale && (
             <span className="truncate text-muted-foreground">{g.rationale}</span>
           )}
@@ -556,14 +564,31 @@ function TimelineDetail({ entry }: { entry: TimelineEntry }) {
     case 'generation': {
       const g = entry.generation!
       return (
-        <div className="ml-10 space-y-1 text-xs text-muted-foreground">
+        <div className="ml-10 space-y-2 text-xs text-muted-foreground">
           <div className="flex flex-wrap gap-x-4 gap-y-1">
             <span>Flow: {teacherFlowType(g.flow_type)}</span>
             <span>Status: {titleCase(g.status)}</span>
             <span>Phase: {titleCase(g.delivered_phase)}</span>
             <span>Progression: {teacherProgressionAction(g.progression_action)}</span>
           </div>
-          {g.rationale && <p className="italic">{g.rationale}</p>}
+          {(g.mastery_signal !== 'insufficient' || g.evidence_signal !== 'steady' || g.progress_signal !== 'insufficient') && (
+            <div className="flex flex-wrap gap-x-4 gap-y-1">
+              {g.mastery_signal !== 'insufficient' && (
+                <span>Mastery: {teacherMasterySignal(g.mastery_signal)} ({formatPercent(g.mastery_confidence)})</span>
+              )}
+              {g.evidence_signal !== 'steady' && (
+                <span>Evidence: {teacherEvidenceSignal(g.evidence_signal)}</span>
+              )}
+              {g.progress_signal !== 'insufficient' && (
+                <span>Progress: {teacherProgressSignal(g.progress_signal)}</span>
+              )}
+            </div>
+          )}
+          {g.evidence_rationale && <p className="italic text-slate-600">{g.evidence_rationale}</p>}
+          {g.next_step.rationale && (
+            <p className="italic">Next: {titleCase(g.next_step.action)} &mdash; {g.next_step.rationale}</p>
+          )}
+          {g.rationale && !g.evidence_rationale && <p className="italic">{g.rationale}</p>}
         </div>
       )
     }
@@ -680,6 +705,22 @@ function ArtifactReviewPanel({
 // Helpers
 // ---------------------------------------------------------------------------
 
+function masteryBadgeColor(signal: string): string {
+  switch (signal) {
+    case 'strong':
+    case 'improving':
+      return 'border-emerald-300 text-emerald-700'
+    case 'stable':
+    case 'steady':
+      return 'border-sky-300 text-sky-700'
+    case 'declining':
+    case 'weak':
+      return 'border-amber-300 text-amber-700'
+    default:
+      return ''
+  }
+}
+
 function StatItem({ label, value }: { label: string; value: string }) {
   return (
     <div className="rounded-lg bg-slate-50 px-3 py-2">
diff --git a/src/dibble/models/history.py b/src/dibble/models/history.py
index 3fd9d15..c9cd905 100644
--- a/src/dibble/models/history.py
+++ b/src/dibble/models/history.py
@@ -22,6 +22,11 @@ class LearnerGenerationHistoryEntry(BaseModel):
     active_target_kc_ids: list[str] = Field(default_factory=list)
     intervention_type: str | None = None
     rationale: str | None = None
+    mastery_signal: str = "insufficient"
+    mastery_confidence: float = Field(default=0.0, ge=0.0, le=1.0)
+    progress_signal: str = "insufficient"
+    evidence_signal: str = "steady"
+    evidence_rationale: str | None = None
     next_step: LearnerFlowNextStep = Field(default_factory=LearnerFlowNextStep)
     continue_action: LearnerContinueAction = Field(
         default_factory=LearnerContinueAction
diff --git a/src/dibble/services/learner_history_service.py b/src/dibble/services/learner_history_service.py
index 64d8f2b..77ef70d 100644
--- a/src/dibble/services/learner_history_service.py
+++ b/src/dibble/services/learner_history_service.py
@@ -47,6 +47,7 @@ def list_generation_history(
         for content in entries[:safe_limit]:
             workflow_summary = content.workflow_summary
             request_context = content.request_context
+            mode_cal = self._mode_calibration(request_context)
             items.append(
                 LearnerGenerationHistoryEntry(
                     generation_id=content.generation_id,
@@ -86,6 +87,15 @@ def list_generation_history(
                     rationale=workflow_summary.rationale
                     if workflow_summary is not None
                     else None,
+                    mastery_signal=mode_cal.get("signal", "insufficient"),
+                    mastery_confidence=float(mode_cal.get("confidence", 0.0)),
+                    progress_signal=mode_cal.get("progress_signal", "insufficient"),
+                    evidence_signal=mode_cal.get(
+                        "current_evidence_signal", "steady"
+                    ),
+                    evidence_rationale=self._maybe_str(
+                        mode_cal.get("current_evidence_rationale")
+                    ),
                     next_step=(
                         workflow_summary.next_step.model_copy()
                         if workflow_summary is not None
@@ -190,6 +200,13 @@ def list_remediation_session_history(
             has_more=has_more,
         )
 
+    @staticmethod
+    def _mode_calibration(request_context: dict[str, object]) -> dict[str, object]:
+        raw = request_context.get("mode_calibration", {})
+        if isinstance(raw, dict):
+            return raw
+        return {}
+
     @staticmethod
     def _maybe_str(value: object) -> str | None:
         if value is None: