diff --git a/workbench-ui/src/app/trace/PracticeEvidencePanel.tsx b/workbench-ui/src/app/trace/PracticeEvidencePanel.tsx
new file mode 100644
index 00000000..d1d518e2
--- /dev/null
+++ b/workbench-ui/src/app/trace/PracticeEvidencePanel.tsx
@@ -0,0 +1,165 @@
+import { useMemo } from "react";
+import type { PracticeEvidence } from "../../types/practiceEvidence";
+import { MetadataTable } from "../../design/components/MetadataTable/MetadataTable";
+import { StableJsonViewer } from "../../design/components/StableJsonViewer";
+import { EmptyState } from "../../design/components/states/EmptyState";
+import { ErrorState } from "../../design/components/states/ErrorState";
+import { LoadingState } from "../../design/components/states/LoadingState";
+import { tracePracticeReproducer } from "./practiceEvidenceEndpoint";
+import {
+  type PracticeEvidenceDetailSection,
+  practiceEvidencePanelModel,
+} from "./practiceEvidencePanelModel";
+
+export interface PracticeEvidencePanelProps {
+  evidence?: PracticeEvidence | null;
+  isLoading: boolean;
+  error: unknown;
+  turnId: number;
+  errorMessage: (error: unknown) => string;
+}
+
+function DetailSection({ section }: { section: PracticeEvidenceDetailSection }) {
+  return (
+    <section className="grid gap-2 rounded-md border border-[var(--color-border-subtle)] p-3">
+      <h3 className="m-0 text-xs font-semibold uppercase text-[var(--color-text-secondary)]">
+        {section.title}
+      </h3>
+      {section.items.length === 0 ? (
+        <p className="m-0 text-sm text-[var(--color-text-secondary)]">{section.emptyMessage}</p>
+      ) : (
+        <div className="grid gap-3">
+          {section.items.map((item) => (
+            <article className="grid gap-2" key={item.title}>
+              <h4 className="m-0 font-mono text-xs text-[var(--color-text-primary)]">
+                {item.title}
+              </h4>
+              <MetadataTable
+                rows={item.rows.map((row) => ({
+                  key: row.key,
+                  value: row.value,
+                  mono: true,
+                }))}
+              />
+            </article>
+          ))}
+        </div>
+      )}
+    </section>
+  );
+}
+
+export function PracticeEvidencePanel({
+  evidence,
+  isLoading,
+  error,
+  turnId,
+  errorMessage,
+}: PracticeEvidencePanelProps) {
+  const reproducer = tracePracticeReproducer(turnId);
+  const rawJson = useMemo(
+    () => (evidence ? JSON.stringify(evidence, null, 2) : ""),
+    [evidence],
+  );
+
+  if (isLoading) {
+    return <LoadingState label="Loading sealed practice evidence..." />;
+  }
+  if (error) {
+    return (
+      <ErrorState
+        whatFailed={errorMessage(error)}
+        mutationStatus="No trace mutation occurred."
+        reproducer={reproducer}
+        retrySafety="Retry: safe"
+      />
+    );
+  }
+  if (!evidence) {
+    return (
+      <EmptyState
+        statement="No sealed practice evidence recorded for this turn."
+        nextAction={{ kind: "cli", command: reproducer }}
+      />
+    );
+  }
+
+  const model = practiceEvidencePanelModel(evidence);
+  return (
+    <section className="grid gap-3" data-testid="practice-evidence-panel">
+      {model.emptyMessage ? (
+        <div className="rounded-md border border-[var(--color-state-warning-border)] bg-[var(--color-state-warning-bg)] p-3 text-sm text-[var(--color-state-warning-text)]">
+          <h3 className="m-0 text-xs font-semibold uppercase">{model.status}</h3>
+          <p className="m-0 mt-2">{model.emptyMessage}</p>
+        </div>
+      ) : null}
+
+      <div className="grid gap-3 xl:grid-cols-2">
+        <MetadataTable
+          rows={model.authorityRows.map((row) => ({
+            key: row.key,
+            value: row.value,
+            mono: true,
+          }))}
+        />
+        <MetadataTable
+          rows={model.countRows.map((row) => ({
+            key: row.key,
+            value: row.value,
+            mono: true,
+          }))}
+        />
+      </div>
+
+      {model.chainRows.length > 0 ? (
+        <MetadataTable
+          rows={model.chainRows.map((row) => ({
+            key: row.key,
+            value: row.value,
+            mono: true,
+          }))}
+        />
+      ) : null}
+
+      <div className="grid gap-3" data-testid="practice-evidence-details">
+        {model.detailSections.map((section) => (
+          <DetailSection key={section.title} section={section} />
+        ))}
+      </div>
+
+      <section className="grid gap-2 rounded-md border border-[var(--color-border-subtle)] p-3">
+        <h3 className="m-0 text-xs font-semibold uppercase text-[var(--color-text-secondary)]">
+          Source spans
+        </h3>
+        {model.sourceSpanRows.length > 0 ? (
+          <MetadataTable
+            rows={model.sourceSpanRows.map((row) => ({
+              key: row.key,
+              value: row.value,
+              mono: true,
+            }))}
+          />
+        ) : (
+          <p className="m-0 text-sm text-[var(--color-text-secondary)]">
+            No source spans recorded.
+          </p>
+        )}
+      </section>
+
+      <div>
+        <div className="mb-1 text-xs font-semibold text-[var(--color-text-secondary)]">
+          reproducer
+        </div>
+        <code className="block overflow-auto rounded-md border border-[var(--color-border-subtle)] bg-[var(--color-surface-inset)] p-2 font-mono text-xs text-[var(--color-text-primary)]">
+          {model.reproducer}
+        </code>
+      </div>
+
+      {model.showRaw ? (
+        <div className="max-h-[28rem] overflow-auto rounded-md border border-[var(--color-border-subtle)] bg-[var(--color-surface-inset)] p-2">
+          <StableJsonViewer source={rawJson} />
+        </div>
+      ) : null}
+    </section>
+  );
+}