diff --git a/workbench-ui/src/app/trace/practiceEvidenceView.ts b/workbench-ui/src/app/trace/practiceEvidenceView.ts
new file mode 100644
index 00000000..51bbb260
--- /dev/null
+++ b/workbench-ui/src/app/trace/practiceEvidenceView.ts
@@ -0,0 +1,26 @@
+import type { PracticeEvidence, PracticeSourceSpanView } from "../../types/practiceEvidence";
+
+export const PRACTICE_AUTHORITY_DISCLOSURES = [
+  "Diagnostic Only",
+  "Serving Disallowed",
+  "Mutation Disallowed",
+  "Replay Execution Disallowed",
+  "Workbench Did Not Execute Replay",
+] as const;
+
+export function practiceEvidenceEmptyMessage(evidence: PracticeEvidence): string | null {
+  if (evidence.status === "missing_evidence") {
+    return evidence.missing_reason ?? "No sealed practice evidence recorded for this turn.";
+  }
+  return evidence.chain.length > 0 || evidence.sealed_trace !== null || evidence.trace_refusal !== null
+    ? null
+    : "No sealed practice evidence recorded for this turn.";
+}
+
+export function practiceSourceSpanLabel(span: PracticeSourceSpanView): string {
+  const sentence =
+    span.sentence_index === null || span.sentence_index === undefined
+      ? "sentence unknown"
+      : `sentence ${span.sentence_index}`;
+  return `${span.start}:${span.end} ${span.text} (${sentence})`;
+}